Guidance for Undergoing Class Maintenance Surveys e 2014
Short Description
Guidance...
Description
Guidance for Undergoing Class Maintenance Surveys
2014
Nippon Kaiji Kyokai
GUIDANCE FOR UNDERGOING CLASS MAINTENANCE SURVEYS
Record of Revision Date
Revised Paragraph
Reason of revision
December 2003
New requirements for General Dry Cargo Ships
February 2004
Annual reviewing
March 2004
Reviewing for publication
August 2004
Appendix 3
Reviewing for amendment of Rule
January 2005
Annual reviewing
January 2005
July 2005 July 2006
Appendix 3
New requirement for Double Skin Bulk Carriers
Appendix 4
Explanatory Notes on CMS and CRS
Appendix 5
Procedure and Guidance to prevention of accident during survey
Main text
Reviewing for amendment of Rule
Appendix 1
Addition of items of Survey Programme
Main text
Reviewing for amendment of Rule
Appendix 3 January 2007
Main text
Reviewing for amendment of Rule
Appendix 1
Revision to Survey Programme and establishment of Survey Planning Questionnaire
July 2007
Main text
Reviewing for amendment of Rule
Appendix 1
Reviewing for amendment of Rule
January 2008
Appendix 3
Reviewing for amendment of Rule
July 2008
Table 1-1,2,3
Annual reviewing
Table 6, 10
Reviewing for amendment of Rule
Appendix 1
Timing of Periodical Survey and Anniversary Date
Appendix 3
Annual reviewing and Reviewing for amendment of Rule
Appendix 4
Annual reviewing and Reviewing for amendment of Rule
September 2008
Table 1-1
Reviewing for amendment of Rule
July 2009
Main text
Annual reviewing
Table 2,4
Annual reviewing and Reviewing for amendment of Rule
Appendix 2
Annual reviewing
Appendix 3
Reviewing for amendment of Rule
Appendix 4-1
Reviewing for amendment of Rule
Appendix 4-7
Thorough and prompt repairs are clearly shown
Main text
Annual reviewing
Table 1,2,6
Reviewing for amendment of Rule
January 2011
Appendix 4, 4-1, 5 May 2014
Annual reviewing
Entire reviewing
(Note) 1. This booklet was compiled in consideration of the amendment of the rule by 26 Feb. 2014. For your information, you can confirm the updated information on NK Home Page ( http://www.classnk.or.jp ).
2. In addition of the above, you can confirm the updated information including followings on NK Home Page. a) Address and Jurisdiction of Branch Office b) List of Approved Firms engaged in Thickness Measurement c) List of Approved Firms for In-water Survey d) Survey Planning Questionnaire e) Survey Programme f)
Rules and Guidance for Class Maintenance Surveys (NK Rule & Guidance Chapter B)
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GUIDANCE FOR UNDERGOING CLASS MAINTENANCE SURVEYS
CONTENTS 1. SURVEY APPLICATION ............................................................................................................................. 5 2. PREPARATION FOR SURVEY .................................................................................................................... 5 3. ATTENDANCE TO SURVEYS .................................................................................................................... 6 4. MAINTENANCE AND PRESENTATION OF DOCUMENTS ........................................................................ 6 5. SURVEY ITEMS ........................................................................................................................................... 6 6. ENHANCED SURVEY .................................................................................................................................. 7 7. GENERAL DRY CARGO SHIPS .................................................................................................................. 8 8. COATING ASSESSMENT FOR BALLAST TANKS ...................................................................................... 8 9. PROMPT AND THOROUGH REPAIR .......................................................................................................... 9 Table 1 Class Survey (SS, IS, AS） ............................................................................................................ 10 Figure 1
Suspect Area & Substantial Corrosion ........................................................................................... 16
Table 1-1
Internal Examination and Pressure Test for Spaces and Tanks required at Special Surveys ........ 17
Table 1-2 Internal Examination for Spaces and Tanks required at Intermediate Surveys .............................. 19 Table 1-3 Internal Examination for Spaces and Tanks required at Annual Surveys ....................................... 20 Table 2
Class Survey (Docking Survey) ...................................................................................................... 21
Table 3
Class Survey (Boiler Survey) ........................................................................................................ 22
Table 4
Class Survey (Propeller Shaft and Stern Tube Shaft Survey) ........................................................ 23
Table 5
Class Survey (Additional Requirements for Tankers) ..................................................................... 25
Table 6
Class Survey (Additional Requirements for Ships Carrying Liquefied Gases in Bulk) ................... 27
Table 7
Class Survey (Additional Requirements for Ships Carrying Dangerous Chemicals in Bulk).......... 30
Table 8
Installation Survey (Automatic and Remote Control Systems) ....................................................... 33
Table 9
Installation Survey (Refrigerating Installation) ................................................................................ 34
Table 10
Installation Survey (Life Saving Appliances of Ships Having SE Certificate) ................................. 35
Table 11
Installation Survey (Navigational Equipment of Ships Having SE Certificate) ................................ 36
Table 12
Installation Survey (Lift of Japanese Flag Ships) ........................................................................... 36
Table 13
Means of Access for the Surveys ................................................................................................... 37
APPENDIX 1
TIMING OF PERIODICAL SURVEY AND ANIVERSARY DATE .......................................................... 38
2
GUIDANCE FOR UNDERGOING FLAG CHANGE SURVEY ............................................................. 39
3
EXPANTORY NOTES ON CMS AND CRS .......................................................................................... 42
4
DETAIL OF HULL SURVEY .................................................................................................................. 56 4-1 Close-up Survey and Thickness Measurement at each Special survey ...................................... 57 Part 1
Single Hull Oil & Chemical Tankers .............................................................................. 57
Part 2
Double Hull Oil & Chemical Tankers ............................................................................. 63
Part 3
Double Hull Oil Tanker built under Part CSR-T of the Rules ........................................ 69
Part 4
Bulk Carriers ................................................................................................................. 72
Part 5
Double Skin Bulk Carriers ............................................................................................. 78
Part 6
Bulk Carriers built under Part CSR-B of the Rules ....................................................... 84
Part 7
Ore Carriers .................................................................................................................. 92
Part 8
Ships Carrying Liquefied Gases in Bulk ........................................................................ 98
Part 9
General Dry Cargo Ships ............................................................................................ 104
Part 10
Other Cargo Ships ...................................................................................................... 110
4-2 Suspect Area .............................................................................................................................. 115 4-3 Additional Thickness Measurement ........................................................................................... 117 4-4 Close-up survey Thickness Measurement and at Intermediate Survey and Annual Survey ...... 125
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GUIDANCE FOR UNDERGOING CLASS MAINTENANCE SURVEYS
4-5 Diminution Limits and Judgement of Steel in Hull Structure and Equipment ............................. 131 4-6 Guidelines for Coating Assessment for Ballast tanks of Tankers ............................................... 140 4-7 Repairs(Wastage and Damages in Association with Wastage) ............................................... 148 5
SURVEY PROGRAMME AND SURVEY PLANNING QUESTIONNAIRE .......................................... 151
6
Procedure and Guidance to prevention of accidents during surveys ................................................. 186 6-1 Confined Space Safe Practice (IACS Recommendation No.72) ............................................... 186 6-2 Safe Use of Rafts or Boats for Survey (IACS Recommendation No.39) ................................... 210 6-3 “CHECK LIST FOR SAFE ENTRY INTO CONFINED SPACES (IACS PR37)” & “Safe Use of Rafts or Boats for Surveys .................................................................................................................. 214 6-4 Safe Use of Portable Ladders for Close-up Surveys (IACS Recommendation No.78) ............... 216
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GUIDANCE FOR UNDERGOING CLASS MAINTENANCE SURVEYS
GUIDANCE FOR CLASS MAITENANCE SURVEYS This Guidance gives the point on the survey items and the related requirements as well as on the necessary preparations to be made for surveys including documentation. This Guidance also helps the survey applicants who are ship owners or their representatives to carry out the surveys expeditiously and economically as scheduled. Regarding the details, please refer to Part B of NK Rules and Guidance. 1. SURVEY APPLICATION The applicant, in principle, is to submit the survey application using the form "APPLICATION FOR SURVEYS AND ISSUE OF CERTIFICATES", which is available at NK Home page, to Exclusive Surveyors' office nearest the port, at which the surveys are scheduled, in advance so that the survey can be carried out at the proper time. Regarding information relating to ship management, including survey status, periodical survey items, survey due dates, please refer to “NK-SHIPS”, which is NK's online information service system for owners and managers of NK classed ships, in case of the registered users, or “LIST OF SURVEY STATUS”, which has been periodically sent to the registered owners or the managing company, who has not registered as NK-SHIPS’s user. 2. PREPARATION FOR SURVEY (1) The essential items required for each periodical survey with regard to internal examination, opening-up examination, test, measurement and confirmatory examination excluding general condition examination and visual examination are shown in the attached tables. Whenever the applicant submits the application for periodical survey, please make necessary preparation for the surveys referring to the tables. (2) The applicant is recommended to have ship's crew or repairers check the condition of hull, machinery, equipment etc., and to arrange for repairs or renewals prior to the surveys, if necessary. By submitting the records of such checking and the records of maintenance by crew to the Surveyor, the applicant may have such benefits that the items or extent of survey may be reduced at the discretion of the Surveyor. (3) Prior to thickness measurement for hull structure members and the related surveys, the meeting between the master of the ship or an appropriately qualified representative appointed by the master or Company, the owner’s representative, thickness measurement firm’s representative and surveyor(s) is to be held in order to carry out them safety and efficiently. (4) Special survey may be commenced at 4th annual survey after classification survey or the last special survey and be progressed during the succeeding year with completion by the 5th anniversary date. The Appendix 1 in this Guidance can be referred to. (5) At intermediate survey for bulk carriers, oil tankers, ships carrying dangerous chemicals in bulk over 10 years of age and for general dry cargo ships (not less than 500 gross tonnage) over 15 years of age, general examinations, Internal examinations, close-up surveys and thickness measurements equivalent as the last special survey including docking survey (except surveys related to anchors) are required. The intermediate survey for the above ships may be commenced at the time of 2nd annual survey or after and be completed at the time of 2nd or 3rd annual survey. The Appendix 1 in this Guidance can be referred to. (6) Where examinations from the Intermediate Survey to be carried out during the period between the 2nd and 3rd Annual Surveys are carried out prior to the Intermediate Survey as a Occasional Survey (Refer to Figure bellow), said examinations to be carried out as part of the Intermediate Survey may be omitted at the discretion of the Surveyor. (7) For oil tankers, chemical tankers and bulk carriers (including ore carriers) engaged in international voyage, the detailed instruction in the 6. ENHANCED SURVEY PROGRAMME of this Guidance is also to be referred to.
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GUIDANCE FOR UNDERGOING CLASS MAINTENANCE SURVEYS
3. ATTENDANCE TO SURVEYS The owners or their representatives are to contact with the surveyor’s office for the preparation of the intended surveys in advance and to arrange a supervisor who is well conversant with the survey items in order to provide the necessary assistance to the surveyor during the survey. 4. MAINTENANCE AND PRESENTATION OF DOCUMENTS The following documents kept onboard are to be presented to the attending Surveyor prior to the surveys. (1) Certificates, etc. - Certificate of Classification - Registration Certificate - Statutory Certificates (Cargo Ship Safety Construction Certificate, Cargo Ship Safety Equipment Certificate, Cargo Ship Safety Radio Certificate, International Load Line Certificate, International Oil Pollution Prevention Certificate,
(2)
(3) (4)
(5)
Fitness Certificate) - Cargo Gear Booklet - Inspection Notebook of Japanese Government (only for Japanese ship) Survey record files - Black File (for class / statutory survey records) - Green File (for condition evaluation reports of ships to which ESP has been applied) Finished plans on hull, machinery and equipment, approved manuals and documents (Loading Manual, Stability Information, etc.) Service records/Maintenance records - Hull thickness measurement record - Periodical inspection table for automatic and remote control systems - Insulation resistance test record - Chief Engineer's report for Continuous Machinery Survey - Others Enhanced Survey Progamme (ESP) - Condition Evaluation Report (Executive Hull Summary, issued after each Special Survey) - Main Structural Plans for Hull - Cargo and Ballast History - Repair History - Thickness Measurement Reports - Survey Programme - Survey Planning Questionnaire (except chemical carriers) - Inspection Report by Ship's Staff with reference to: structural deterioration in general, leakage in bulkheads and piping, condition of coating and/or corrosion prevention system, if any - Record of use of IGS and COW system (if provided in oil tankers)
5. SURVEY ITEMS (1) With regard to internal inspection, opening-up inspection, test, measurement, confirmation, etc. required for periodical surveys, the following listed tables are to be referred to, depending on the kind of surveys, type of ships and installations of ships. (a) For all ships (i) Special Survey, Intermediate Survey, Annual Survey ··············································· Table 1
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GUIDANCE FOR UNDERGOING CLASS MAINTENANCE SURVEYS
(b) (c) (d) (e) (f) (g) (h) (i)
(ii) Docking Survey ························································································· Table 2 (iii) Boiler Survey ···························································································· Table 3 (iv) Propeller Shaft and Stern Tube Survey ······························································ Table 4 For tankers and chemical carriers ·········································································· Table 5 For gas carriers································································································ Table 6 For chemical carriers ························································································· Table 7 Automatic and remote control systems ···································································· Table 8 Refrigerating installations ··················································································· Table 9 Life saving appliances of ships having SE certificate ··················································· Table 10 Navigational equipment of ships having SE certificate ················································· Table 11 Lift of Japanese flag ships ················································································· Table 12
(Note)
(2)
(3) (4) (5)
Table 5 to 12 is applicable in addition to Table 1 to 4. For example, in the case of Japanese flag oil tanker having automatic and remote control systems engaged in international voyage, the Tables 1 to 5, 8, 10, 11 and 12 are applicable.
These tables contain only survey items related to internal examination, opening-up examination, test, measurement and/or confirmation examination except for general condition examination or visual examination. The surveyor may request any examination in addition to those specified in the tables where he deems it necessary. Surveyor may modify the extent and/or requirement of survey, taking into consideration the condition of the relevant part upon reviewing the service record or maintenance record. With regard to thickness measurement of structural members, please refer to Part B of NK Rules. The thickness measurements are necessary for the attendance of the surveyors and thickness measurements of structures in areas where close-up surveys are required are to be carried out simultaneously with close-up surveys. Also, longitudinal strength of hull girder is re-assessed on the basis of the thickness measurements and structural reinforcements may be required if necessary.
6. ENHANCED SURVEY PROGRAMME (1) IACS unified requirements for enhanced survey programme have been in force since 1 July 1993 for oil tankers and bulk carriers (including ore carriers) and since 1 July 1997 for chemical tankers. At the periodical survey, internal examinations, close-up surveys, thickness measurements and etc. are additionally required. For these survey items, as the means of access for the structural members are specified in our GUIDANCE FOR THE SURVEY AND CONSTRUCTION OF STEEL SHIPS, survey preparation is to follow the Table 13. (2) With effect from 1 July 2001, on ships of the above (1) of 20,000 DWT and above, starting with special survey No. 3, all special and intermediate surveys are to be carried out by at least two exclusive surveyors. Also, with effect from 1 September 2004, on bulk carriers of 100,000 DWT and above of single side skin construction, intermediate survey between 10 and 15 years of age is to be performed by at least two exclusive surveyors. (3) For special surveys for bulk carriers, oil tankers, ships carrying dangerous chemicals in bulk and intermediate survey for bulk carriers, oil tankers, ships carrying dangerous chemicals in bulk over 10 years of age, a specific survey programme identifying the outline of the surveys such as internal examinations, close-up surveys and thickness measurements etc. to be prepared and submitted by the owners to the surveyor’s office in advance. Further, for the bulk carriers and oil tankers of the above, a survey planning questionnaire which would be a part of survey programme is also required to submit prior to preparation of survey programme. For filling out these forms, the Appendix 5 in this Guidance can be referred to. (4) Regarding the details of the retroactive requirements for BULK CARRIER SAFETY, please refer to our guidance “BULK CARRIER SAFETY Retroactive Requirements for existing bulk carriers” which is -7-
GUIDANCE FOR UNDERGOING CLASS MAINTENANCE SURVEYS
(5)
(6)
available at NK Home Page. "Oil Tankers" are ships constructed or adapted for the carriage of oil in bulk and including chemical carriers intended to carry oil in bulk and combination carriers which are designed to carry either oil or solid cargoes in bulk, such as ore/oil and ore/bulk/oil carriers. "Bulk Carriers" means the following category of ships (Notation “BC” does not relate to the followings): ships constructed or converted with a single deck, top-side tanks and hopper side tanks in cargo area and intended primarily to carry dry cargo in bulk (See the figure below); or ore carriers; or combination carriers such as ore/oil carriers and ore/bulk/oil carriers. Although, the ships mentioned as BULK CARRIER in SOLAS certificate, the ships need to be applied to the requirements of General Dry Cargo Ships or Other Cargo Ships in case ESP (ENHANCED SURVEY PROGRAMME) is not affixed in Classification Certificate.
(7)
(8) 7.
“Ore Carriers” mean ships constructed or converted with a single deck, two longitudinal bulkheads and a double bottom throughout the cargo area and intended for the carriage of ore cargoes in the center holds only. “Combination Carriers” mean ships designed to carry either oil or solid cargoes in bulk. Requirements for General Dry Cargo Ships
(1) IACS unified requirements for general dry cargo ships have been in force since 1 January 2004."General Dry Cargo Ships" are ships constructed or converted to carry solid cargoes other than: bulk carrier bulk carrier (Although, the ships mentioned as BULK CARRIER in SOLAS certificate, the ships need to be applied to the requirements of General Dry Cargo Ships in case ESP (ENHANCED SURVEY PROGRAMME) is not affixed in Classification Certificate.) container carrier dedicated forest product carriers (except for ships carrying timer cargoes) ro-ro cargo ships car carriers refrigerated cargo ships dedicated wood chip carrier and
dedicated cement carriers ships of double side-skin construction, with double side-skin extending for entire length of the cargo area, and for the entire height of the cargo hold to the upper deck
(2) "Ships carrying timber cargoes" are cargo ships which belongs to general dry cargo ships specified in the above and which marked timber load lines in accordance with the requirement in Rule or primarily carrying log cargoes. (3) Following dedicated ships to carry solid cargoes are treated as “Other Cargo Ships” in this guidance and content of survey for hull part in detail are summarized in Appendix 4. It is not allowed for these ships to change kind of cargoes as far as the vessels are treated as “Other Cargo Ships”. container carrier dedicated forest product carriers (except for ships carrying timber cargoes) ro-ro cargo ships car carriers refrigerated cargo ships dedicated wood chip carrier and dedicated cement carriers ships of double side-skin construction, with double side-skin extending for entire length of the cargo area, and for the entire height of the cargo hold to the upper deck
8. Coating Assessment for Ballast Tanks For oil tankers, ships carrying dangerous chemicals in bulk, detailed guidelines for coating assessment of ballast tanks has been in force since 1 July 2006. For this detailed guideline, Appendix 4-6 is to be referred to. -8-
GUIDANCE FOR UNDERGOING CLASS MAINTENANCE SURVEYS
9. Thorough and prompt repair Any damage in association with wastage over the allowable limits, or extensive areas of wastage over the allowable limits should be promptly and thoroughly repaired. IMO resolution and IACS Unified Requirements, related, are referred in Appendix 4-7.
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GUIDANCE FOR UNDERGOING CLASS MAINTENANCE SURVEYS
Table 1
Class Survey (SS, IS, AS)
SURVEY ITEMS
SS *1
INTERNAL EXAMINATION, INTERNAL GENERAL EXAMINATION, CLOSE-UP SURVEY AND I ,P
*1
IS
AS
*1
I*1
M*2
M*3
I
PRESSURE TEST FOR HULL COMPARTMENTS AND TANKS (EXCLUDING INSTALLED TANKS) (Note) -To make necessary preparations for survey, such as cleaning of compartments, chipping and scaling, gas-freeing, sufficient lighting, nondestructive testing equipment and other items of preparation required for tests and examinations according to the purpose of survey. -To remove dangers such as improper arrangement of scaffoldings, non availability of lighting, fire, explosion, electric shock, falling of things, harmful gases and oxygen deficiency. (Refer to Appendix 6-1 IACS Recommendation No.72.) -To prepare stagings, cherry picker or rubber boats for close-up survey. (Refer to Appendix 6-2 IACS Recommendation No.39.) -To consult with attending surveyor about survey items including gauging which the owner should prepare well in advance. ･ Internal Examination and Pressure Test
Refer to Table 1-1,2 and 3.
･ Close-up survey Oil Tankers and Chemical Carriers :
Refer to Appendix 4-1 (Part 1 and Part 2) and Appendix 4-4
Double Hull Oil Tankers Built under Part CSR-T of the Rules. : Refer to Appendix 4-1 (Part3) Bulk Carriers excluding Ore Carriers :
Refer to Appendix 4-1 (Part 4 and Part 5) and Appendix 4-4
Bulk Carrier Built under Part CSR-B of the Rules. : Refer to Appendix 4-1 (Part6) Ore Carriers :
Refer to Appendix 4-1 (Part 7) and Appendix 4-4.
Ships Carrying Liquefied Gases in Bulk :
Refer to Appendix 4-1 (Part 8) and Appendix 4-4.
General Dry Cargo Ships including ships carrying timber cargoes : Ships other than the above :
Refer to Appendix 4-1 (Part 9).
Refer to Appendix 4-1 (Part 10).
THICKNESS GAUGING OF STRUCTURAL MEMBERS (Note) Appendix 4-1 and Appendix 4-4.
M
MOORING ARRANGEMENT, ANCHORING ARRANGEMENT ・Measurement of diameter of anchor chain cables (to be conducted at DS coinciding with SS No.2 and
M
subsequent.) ・Performance test of the arrangement
T
T
LOADING COMPUTER
T
C
C
STABILITY COMPUTER (Constructed for building on or after 1 July 2005)
T
T
T
STEERING ARRANGEMENT (CONTROL SYSTEM, ALARM SYSTEM, RUDDER INDICATOR)
T
T
T
BALLAST LINES
T
BILGE SYSTEM (CARGO HOLD, ENGINE ROOM, etc.)
T
T
T
*8
T
T*8
WATER LEVEL DETECTION AND ALARM SYSTEMS
T
DEWATERING ARRANGEMENT FOR DRY SPACES AND BALLAST TANKS
T
T
T
・Hose test (if deemed necessary by the Surveyor)
H
H*4
H*5
・Mechanically operated steel hatch cover
T
T*6
T*6
CLOSING APPLIANCES (door for watertight bulkhead, superstructure end bulkhead and deckhouses)
T*7
T*7
T*7
Hose tests or equivalent tests
H
H*4
H*4
TEST OF FIRE PROTECTION ARRANGEMENT AND MEANS OF ESCAPE
T
T
T
・Hose test
H
H*5
H*5
・Mechanically operated steel hatch cover
T
T
T
CARGO HATCH COVER
BOW DOORS, INNER DOORS, SIDE SHELL DOORS AND STERN DOORS
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GUIDANCE FOR UNDERGOING CLASS MAINTENANCE SURVEYS
SURVEY ITEMS AUTOMATIC AIR PIPE HEADS (Internal examination of the heads indicated by surveyors to be carried out.) Special Survey No.1 :
SS I
1. Each one head for ballast tanks at P&S side located on exposed deck In the forward 0.25 L 2. Each one head for ballast tanks at P&S side located on exposed deck in the after 0.25 L
Special Survey No.2 :
1. All heads located on exposed deck in the forward 0.25 L 2. At least 20% heads (preferably air pipes serving ballast tanks) located on exposed deck in the after 0.25 L
Special Survey No.3 and subsequent Special Survey :
All heads located on exposed deck
Air pipe heads that show substantiated evidence of replacement within the previous five years may be exempted; however, the number is not to be less than that required in Special Survey No.1 VENTILATOR(Opening-up inspection of the ventilator (internal examination of closing
I
appliances) indicated by surveyors to be carried out.) Special Survey No.1 : 1. Each one ventilator for machinery spaces 2. Each one ventilator for cargo spaces Special Survey No.2 :
1. All ventilators for machinery spaces 2. At least 20% ventilators located in cargo area
Special Survey No.3 and subsequent Special Survey : 1. All ventilators Not withstanding the above 1., ventilators that showed substantiated evidence of the replacement of closing appliances within the past five years may be exempted; however, the number is not to be less than that required for Special Survey No.1 MEANS OF EMBARKATION AND DISEMBARKATION (for ships not less than 500 gross tonnage which are engaged on international voyages) ・ Performance test (The load tests are to be carried out with the following load applied as uniformally as possible along the length of the accommodation ladder or gangway, at an angle of inclination corresponding to the maximum bending moment of of the accommodation ladder or gangway.) (a) the design load (b) the maximum operational load, if this is less than the design load; and (c) the load nominated by the ship owner or operator only in those case where the design load or maximum operational load is not unknown
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T
IS
AS
GUIDANCE FOR UNDERGOING CLASS MAINTENANCE SURVEYS
SURVEY ITEMS GENERAL EXAMINATION ・Shell Plating and Weather Deck Plating
SS
IS
AS
X
X
X
C
C
C
・Opening on deck and outside of the hull ・Casings of Engine Room ・Ventilators and Air Pipes ・Load Line Marks ・Watertight bulkhead, superstructure end bulkhead and deckhouses ・Bulwark and Means of Access ・Scuppers, Inlets, Other Discharge Pipes and Valves ・Securing Arrangement for on-deck timber ・Anchoring and Mooring Arrangement ・Fire Extinguisher Arrangement ・Fire Protection Arrangement and Means of Escape ・Sails and their Accessories ・Emergency towing Arrangement ・Means of embarkation and disembarkation ・Bow doors, Inner doors, Side Shell doors and Stern doors * ・Piping in the cargo holds (bulk carriers and general dry cargo ships over 15 years of age) ・Ladders and Steps (for Japanese Ships) PLANS & DOCUMENTS ・Loading Manual、Stability Information ・Damage Control Plan, Booklet and Damage Stability Information ・Fire Control Plan ・Manual for the bow door and inner door and notice board ・Instruction Manual for the Inert Gas System ・Cargo Securing Manual (for Japanese Ships) ・Towing and Mooring Fitting Arrangement Plan ・Ship Structural Access Manual ・Following documents related to surveys for bulk carriers, oil tankers and ships carrying dangerous chemicals in bulk (1) Records on structural surveys (2) Condition evaluation report (3) Thickness measurement report (4) Main structural plans for hull (5) Cargo and ballast history (6) Previous repair history (7) Records inspections by ship’s personnel with reference to structural deterioration in general, the leakage in bulkheads and piping and the condition of coating or corrosion preventionsy system, if any (8) In oil tankers and ships carrying dangerous chemicals in bulk, extent of use of inert gas plant and tank cleaning procedures (9) Any other information that will help identify Suspect Areas requiring inspection ・Coating Technical File and / or Corrosion Resistant Steel Technical File ・The other plans and documents if required (10) Ship Construction File (ships applied to SOLAS II-1 Chapter3-10) - 12 -
GUIDANCE FOR UNDERGOING CLASS MAINTENANCE SURVEYS
SURVEY ITEMS
SS
IS
AS
O*9
O*9
T
T
vibration for steam engine, etc.) ・Measurement of crank deflection of main engine
M
M
・Remote control of shut-off device for flammable oil tanks
T
T
T
・Remote control stop of F.O. pumps, cargo oil pumps, ventilators, boiler draft fans, etc.
T
T
T
・Communication system
T
T
T
・Steering Gears
T
T
T
*
T
T
T
T
T
T
MAIN ENGINE, AUXILIARY ENGINE, PROPELLER SHAFTING, POWER TRANSMISSION SYSTEM, MONITORING DEVICE, CONTROL SYSTEM, ETC. ・Opening-up inspection (Planned Machinery Survey ) (Note) In applying Planned Machinery Maintenance Scheme (PMS) or Preventive Machinery Maintenance Scheme (PMMS), refer to the approved Survey Schedule Table. In applying Continuous Machinery Survey (CMS), refer to "EXPLANATORY NOTES ON CONTINUOUS MACHINERY SURVEY AND CONTINUOUS SURVEY OF CARGO REFRIGERATING INSTALLATIONS"
・Main engine, auxiliary engine for generator and for essential service a)
Over speed protective device
b)
Automatic stop and alarm system by failure of supply of L.O. or lower pressure of L.O.
c)
Steam shut-off devices in case of low main condenser vacuum
d)
Other safety devices (remote control emergency stop device, trip device by excessive
Monitoring devices (pressure indicators, thermometers, ammeters, voltmeters and revolution
meters) *
Automatic devices or remote control devices
*
Pressure test of condensers and shells of receivers for refrigerating installation (the pressure test
T
P
may be replaced by other means as deemed appropriate by the surveyor) ・Leak test of refrigerant under working condition of refrigerating machinery T
T
T
T
SPARE PARTS, TOOLS AND INSTRUMENTS
C
C
ELECTRICAL INSTALLATIONS ・Performance test of speed governors, circuit breakers and their associated relays (Running test under
T
BOILER, THERMAL OIL HEATER, EXHAUST GAS HEATER * Performance test of safety device, alarm devices, relieving gears of the safety valves and
T
pressure indicators including confirmation of calibration records for the pressure indicators (Note) The relief valves on the exhaust gas economizers are to be tested by the Chief Engineer and
the results are to be recorded in the logbook.
loaded condition either separately or in parallel) ・Performance test of communication system and emergency source of power
T
T
*
Insulation resistance measurement of generators, switchboards, motors and electric cables (may
M
M
be dispensed with where proper record is maintained and deemed appropriate by the Surveyor) ・ Lighting, communication, signaling and ventilation systems and other electrical equipment
T
(including performance test of interlocking devices)
- 13 -
T
GUIDANCE FOR UNDERGOING CLASS MAINTENANCE SURVEYS
SURVEY ITEMS
SS
IS
AS
T
T
T
･Fire detection and fire alarm system including failure alarm and manual operation
T
T
T
･Ventilating arrangement
T
T
T T
FIRE FIGHTING ARRANGEMENT ･Water jet test of fire hose
･Fixed deck foam system [water supply test]
T
T
･Dry chemical powder fire-extinguishing system [air blow test, quantity check of starting/pressuring
T
T
gas, operation test of remote control system/monitors/hoses] ･Water spray system [water supply test, quantity check of delivered water may be dispensed with]
T
T
･Fixed CO2 fire-extinguishing system [air blow test, checking of alarm system]
T
T
･Fixed foam, high-expansion foam fire-extinguishing systems [water supply test]
T
T
･Fixed pressure water-spraying fire-extinguishing system [water supply test]
T
T
･Automatic sprinkler including sprinkler pump, fire detection and fire alarm systems
T
T
･Closing appliance of opening related to fire fighting in cargo area [operation test]
T
T
･Measurement of quantity of CO2, Halon (to be more than 90% of original quantity) and dry chemical
M
M
cartridge type: gas bottle not to reduce by more than the maximum tolerance of pressure gauge) ･Confirmation of effectiveness of extinguishing medium
C
C
･Deep-fat cooking equipment[operation test]
T
T
･Fired local application fire-fighting systems [air blow test, checking of alarm system, feed water pump
T
T
and starting valve works] ･Confirmation of appliances [EEBD, Fire-fighter’s outfits, maintenance of emergency fire pump
C
C
C
(including o 5 yearly overhaul inspections of the self priming pump and associated equipment) etc.] ･Confirmation of documents (Maintenance Plans, Training manuals, Fire safety operational booklets,
C
C
C
powder (stored pressure type: extinguishing medium not to be more than 90% of original pressure
etc)
Type (foam extinguisher) Standard Validity Type (dry-chemical extinguisher) Portable foam (9l) 1 year (spare 2 years)*1 Portable dry-chemical Moval foam (45l, 135l) 1 year (spare 2 years)*1 Movable dry-chemical Portable foam applicator (20l) 3 years*2 (spare 3 years) *1 Fixed dry-chemical Deck foam 3 years*2 High expansion foam 3 years*2 1 * : Also to be followed by manufacturer’s instruction. *2 : - IMO MSC / Circ.1312 (Deck foam and Low expansion) and 670 (High expansion) to be be extended for 1 years subject to verification of effectiveness by chemical analysis.) - Flag’s special requirements, if any, to be referred.
- 14 -
Standard Validity 5 years*1 5 years*1 valid so far as it is not moisturized referred. (Validity may
C
GUIDANCE FOR UNDERGOING CLASS MAINTENANCE SURVEYS
As class requirements for Japanese Flag Ships Oil Pollution Prevention System (General) ･Shipboard Oil Pollution Emergency Plans
C
C
C
Oil Pollution Prevention System (Engine Room) ･Oil Discharge Monitoring and Control System for Bilge
T
T
T
･Oil filtering system [alarm, automatic stopping device]
T
T
T
･Equipment for control of sludge or homogenizer if the capacity of sludge tank is reduced
T
T
T
･Oily-water separating equipment, oil filtering equipment, oil content meter
T
T
･Correction of oil content meter
C
C
･Oily-water separating equipment, oil filtering equipment [function test by feeding water]
T
T
･Open-up inspection of oily-water separating equipment, oil filtering equipment including attached
O
O
pump and major valve Load Test*10
Cargo Handling Appliances
ATS*11
T
Cargo Handling Appliances (General) Cargo Handling Appliances (5 yearly annual thorough survey for derricks) ･Topping bracket, Goose neck bracket and Derrick heel lugs
X, T O
X:
General examination
I:
Internal examination
O:
Opening-up examination
T:
Performance test
P:
Pressure test
H:
Hose test
M:
Measurement
C:
Confirmation examination
: Special Requirement for Japanese flag ship *1： Refer to Table 1-1. In addition, “Suspect area” identified at previous special or intermediate surveys are to be overall and close-up surveyed. (At Annual Survey, the surveys for cargo tanks are not required.) As for “Suspect area”, refer to Figure 1. *2： Applicable to the members of the ships mainly over 5 years of age at the discretion of the Surveyor and the members measured in consideration of the ships age. In addition, suspect areas identified at previous surveys. *3 :
Applicable to the members of the ships mainly over 5 years of age at the discretion of the Surveyor and the members measured in consideration of the ships age. In addition, suspects areas (except cargo tanks) identified at previous surveys.
*4 :
Performance test may be dispensed with at the surveyor's discretion. (For Intermediate survey of Bulk carrier over 15 years of age, this test cannot be dispensed with.)
*5 :
When deemed necessary by the Surveyor.
*6 :
To be carried out for selected hatch covers. (For Intermediate survey of Bulk carrier over 15 years of age, to be carried out for all covers) ・ ・
Operation tests including hydraulic and power components, wire, chains and link dreives For mechanically operated hatch covers on bulk carrier, hatch cover sets within the forward 0.25Lf and at least one additional set, including hydraulic and power components, wires, chains and link drives, are to be checked for satisfactory operation so that all sets on the ship are checked at least once every 5 years between special surveys.
*7 :
Tests may be omitted at the discretion of the Surveyor.
*8 :
To be carried out for selected ones. (For Intermediate survey of Bulk carrier over 10 years of age, to be carried out for all.)
*9 :
Applicable to ships other than those applying CMS, PMS or PMMS. Open-up items of IS differ from those of SS.
*10 : To be carried out with an interval of maximum 5 years (maximum 3 months extension may be granted) *11 :
To be carried out with an interval of maximum 12 months (maximum 3 months extension may be granted)
- 15 -
GUIDANCE FOR UNDERGOING CLASS MAINTENANCE SURVEYS
Figure 1 Kind of Survey
Suspect Areas & Substantial Corrosion Result
Additional Requirements
Annual Internal
No coating/POOR
Ballast Tanks
Examination
Suspect Areas Rapid Corrosion
Cargo Tanks, Cargo Holds and the other structural members
Substantial Corrosion
At Annual Survey (For cargo tanks, at Intermediate Survey) Suspect areas to be examined and thickness measurement to be carried out.
Additional Thickness Measurement
(NOTE) Substantial Corrosion
Corrosion pattern indicates a wastage in excess of 75% of allowable margins but within acceptable limits. Notwithstanding the above, for the following (a) to (c), “substantial corrosion” is an extent of corrosion such that the assessment of the corrosion pattern indicates a gauged (or measured) thickness between the thickness obtained by adding 0.5(mm) to the renewal thickness and the renewal thickness. “Renewal thickness” refers to the minimum allowable thickness below which the renewal of structural members is to be carried out. (a) For ships complying with the provisions of Part CSR-B and Part CSR-T. (b) For hatch covers and hatch coamings for cargo holds of the ships stipulated otherwise by the Society. (B1.3.1 -3 of Guidance Part B to be referred to) (c) For transverse watertight bulkheads in cargo hold complying with the provision of Chapter 31A, Part C or Chapter 31B, Part C. (B1.3.1 -4 of Guidance Part B to be referred to)
Suspect Areas Locations showing “Substantial Corrosion” and/or are considered by the Surveyor to be prone to rapid wastage.
- 16 -
GUIDANCE FOR UNDERGOING CLASS MAINTENANCE SURVEYS
Table 1-1 Internal Examination and Pressure Test for Spaces and Tanks required at Special Surveys
5 years→
SS No.1 Spaces, Tanks
10 years→
15 years→ ←Over 15 years
SS No.2
SS No.3
SS No.4～
IE
PT
IE
PT
IE
PT
IE
PT
Ballast Tanks
○
○
○
○
○
○
○
○
Fore and Aft Peak Tanks
○
○
○
○
○
○
○
○
Fresh Water Tanks
―
△
▲
△
▲
△
▲
△
*8
*1
*8
*1
*8
*1
*8
Fuel Oil Tanks ▲
▲
▲
Tanks within Cargo Area
―
△
Other Tanks
―
△
―
△
―
△
―
△
―
△
○
○
○
○
○
○
○
○
○
○
○
○
Lubricated Oil Tanks
*1
△
*4 ▲ *5
△
△
*6 ▲ *5 ▲ *1*7
△
△
△
Cargo Tanks Tankers and Chemical Tankers
○
Gas Carriers
○
○
Cargo Holds Void Spaces, Cofferdams, Rudder Trunk etc. Engine Room, Pump Room, etc.
○ *2 ○ ○ *3
○
○ *3
○
○ *3
○
○ *3
○
―
○
―
○
―
○
―
○
―
○
―
○
―
○
―
(Remarks) １．Requirements for fresh water tanks are applied to bilge tanks and sludge tanks ２．Marks / Abbreviation： IE ： Internal Examination,
PT：Pressure Test，SS：Special Survey
○ ： to be carried out. ▲ ： may be limited to remarks “*”shown bellow subject to external examination. △ ： may be special considered, in case external examination for BHD of tanks is found satisfactory by attending surveyor and confirmation from the master stating that the pressure testing has been carried out according to the Rule with satisfactory result. ３．For bulk carriers, double hull oil tankers and ships carrying dangerous chemicals in bulk with integral tanks, pressure testing of double bottom tanks and other watertight compartments not designed to carry liquids may be omitted, provided that satisfactory internal and/or external examinations are carried out. - 17 -
GUIDANCE FOR UNDERGOING CLASS MAINTENANCE SURVEYS
＊1
At least one tank.
＊2
Test for cargo tank boundaries facing spaces/tanks other than cargo tanks to be carried out.
＊3
Combined cargo hold/ballast tank.
＊4
At least two tanks. At least one deep oil tank to be included if any.
＊5
At least one tank in E/R. Internal examination to be carried out for Fore and aft peak tanks if any.
＊6
At least half of tanks (minimum two tanks). At least one deep oil tank to be included if any.
＊7
Internal examination to be carried out for Fore and aft peak tanks.
＊8
For gas carriers, bulk carriers and general dry cargo ships, test for deep water tank boundaries within cargo area to be carried out. Can not be dispensed with.
- 18 -
GUIDANCE FOR UNDERGOING CLASS MAINTENANCE SURVEYS
Table 1-2 Internal Examination for Spaces and Tanks required at Intermediate Surveys up to 5 years
up to 10 years
up to 15 years
IS
IS
IS
IS
Tankers except Double Hull
○
◎
◎
Double Hull Tankers, Double Skin Bulk Carriers
○ ＊2
◎
◎
Chemical Carriers, Bulk Carriers except Double Skin
○ ＊1
◎
◎
General Dry Cargo Ships
○ ＊1
○
◎
Other Ship than those mentioned above
○ ＊1
○
○
◎
◎
○
◎
Spaces, Tanks
Over 15 years
Water Tanks (Double Bottom & Deep Tanks)
Cargo Tanks Tankers and Chemical Carriers Cargo Holds ○(2C/H)
General Dry Cargo Ships
＊3
Bulk Carriers
○
◎
◎
Lumber Carriers
○
○
◎
Other Ship than those mentioned above Engine Room, Pump Room, etc.
○
○
○(1C/H)
○(2C/H)
＊4
＊3
○
○
(Note)
1. Requirement for water tanks to be applied to bilge tanks 2. Marks / Abbreviation
IS : Intermediate Survey ○： to be carried out ◎：to be carried out by the same requirements as previous Special Survey including void space, cofferdams, pipe tunnels, rudder trunk etc. (but except fuel oil tanks, lubrication oil tanks and fresh water tanks) ＊1
Representative ballast tanks (at least fore and aft peak tanks and two deep tanks within the cargo length area)
＊2
Representative ballast tanks (at least fore and aft peak tanks and three deep tanks within the cargo length area)
＊3
One forward and one after cargo hold
＊4
One selected cargo hold for cargo ships excluding ships solely carrying dry cargoes
- 19 -
GUIDANCE FOR UNDERGOING CLASS MAINTENANCE SURVEYS
Table 1-3 Internal Examination for Spaces and Tanks required at Annual Surveys 5 years
Spaces, Tanks
10 years
15 years
Over 15 years
up to 5 years
over 5 years - up over 10 years - up
over 15 years
of age
to 10 years of age to 15 years of age
of age
Water Tanks (Double Bottom & Deep Tanks) Tankers except Double Hull
▲
▲
▲
Double Hull Tankers
▲
▲
▲
▲
▲
▲
○
○
Other Ships than those mentioned above Cargo Holds Bulk Carriers except Double Skin Double Skin Bulk Carriers
○(2C/H)
and Ore Carrier
＊1 ○(2C/H)
General Dry Cargo Ships
＊2
Lumber Carriers Engine Room, Pump Room, etc.
○
○ ○
○
○
○
○
○
○
(Note) 1. Marks / Abbreviation ○：to be carried out ▲：to be carried out for tanks of which an internal examination is required at annual interval as a consequence of the last Special Survey or Intermediate Survey ＊1
Two selected cargo holds
＊2
One forward and one after cargo hold
- 20 -
GUIDANCE FOR UNDERGOING CLASS MAINTENANCE SURVEYS
Table 2
Class Survey (Docking Survey) SURVEY ITEMS
BOTTOM INSPECTION (IN DRYDOCK OR ON SLIPWAY) ･Inspection of rudder, shell plating
X X
･Lifting or removing of rudder (Note)
May be dispensed with provided the Surveyor is satisfied with the condition of the rudder bearings by a measurement of the clearance
X
･Pressure Test may be required as deemed necessary by the surveyor
M
･Measurement of clearance of rudder bearing
X
･Inspection of propeller
X
･Sea inlet and overboard discharge and their associated valves under freeboard deck
O
･Opening-up examination of sea valves (Note) May be dispensed with at the discretion of the Surveyor provided they were dismantled and examined at the last Docking Survey
M
･Clearance or wear down of stern tube ･Sealing device of stern tube bearing:
M,X
Confirmation of efficiency of oil gland of sealing device ･Anchor, anchor chain, rope, hawse pipe, chain locker and chain stopper
M,X
At Docking Survey carried out in connection with SS, anchor and anchor chain are to be ranged and all chains and chain related equipment are to be verified externally examined. At SS No.2 and subsequent, measurement of diameter of anchor chain is to be carried out. ･Internal examination, close-up survey, thickness measurement of tank and spaces (if not already carried out) (1) At least of the lower portions, which are considered to be the parts below light ballast water line, of the cargo holds/tanks and water ballast tanks at Docking Surveys in dry dock or on slipway carried out in conjunction with Special Surveys or at the time specified in Part B 4.1.1-2. (2) At Docking Surveys carried out at the time specified in Part B 1.1.6-5 as far as applicable. (Note)
･In principle, In-water survey may be accepted in lieu of Docking Survey other than that coincides with Special Survey for ships up to 15 years old according to the approved plans and documents. The approval of these plans and documents are performed by the survey office in charge of confirming the ship’s facility suitable for In-water survey, and “IWS” is registered in the Class Notation of Particulars (NK Form RP) . In-water survey in lieu of Docking Survey and Intermediate survey
In-water survey in lieu of Docking Survey
10 years
15 years
Bulk Carriers, Oil Tankers and Chemical Tankers
OK
OK
OK
No
Other Ships
OK
OK
OK
OK*
5 years
10 years
15 years
Not required
Not required
Required
Intermediate survey and Docking Survey
Intermediate survey to be carried out together with Docking Survey
Over 15 years
5 years
Bulk Carriers, Oil Tankers and Chemical Tankers General Dry Cargo Ships Other Ships
Over 15 years
Required
Not Not Not Required required required required Not Not Not Not required required required required ･No extension should be granted except along with the extension of SS for Ships. However, in any case, it should not exceed 36 months from the previous docking. *In case a special approval is given by society. X: General examination
O: Opening-up examination
M:
- 21 -
Measurement
I: Internal examination
I
GUIDANCE FOR UNDERGOING CLASS MAINTENANCE SURVEYS
Table 3
Class Survey (Boiler Survey) SURVEY ITEMS
BOILER, THERMAL OIL HEATER, EXHAUST GAS ECONOMIZER, ETC. ･Internal and external inspection ･Opening-up inspection of valves and cocks
T
･Performance test of safety devices ･Popping test of safety valves and confirmation of their setting pressure (including confirmation of the calibration record of pressure gauge) and operation test of the relieving gears of safety valves (Note) ・No extension should be granted except along with the extension of SS for Ships to which HSSC is applied. ･For boilers, preparation is to be made by discharging of boiler water, opening-up of smoke door, cleaning of water/fire side including furnace, overhauling of mountings/safety valves. ･For exhaust gas economizers, preparation is to be made by opening-up of smoke door, cleaning of exhaust gas side, overhauling of mountings/safety valves. ･The relief valves on the exhaust gas economizers may be tested by the chief engineer and the results are to be recorded in the logbook. I: Internal examination
I O
O: Opening-up examination
T: Performance test
- 22 -
T
GUIDANCE FOR UNDERGOING CLASS MAINTENANCE SURVEYS
Table 4
Class Survey (Propeller Shaft and Stern Tube Survey) SURVEY ITEMS
ORDINARY SURVEY ･Examination of propeller shaft, coupling bolt and stern tube (coupling bolts are to be examined by an efficient
O
crack detection method, in cases where Surveyors, based on the results of external examinations, deem such addition testing to be necessary.) ･Examination by "Magnetic Particle Method" on propeller fitting parts ･Clearances in stern tubes or wear down of stern bearings (before pulling out and after fitting) ･Opening-up examination of stern tube sealing devices ･In the case of CPP propellers, opening-up of pitch control gear and working parts and examination by "Magnetic Particle Method" of propeller blade fixing bolts ･L.O. tank low level alarms, oil temperature measuring devices, L.O. piping and L.O. circulating pumps ･Propeller force fitting for the shafts with keyless propeller attachment
X M O O,X T M
(Note) Propeller shaft applied to preventive maintenance system (PSCM) is to be in accordance with the approved preventive maintenance manual. PARTIAL SURVEY / POSTPONEMENT SURVEYS (for the purpose of harmonizing PS with Docking Survey) (1) Postponement Survey [ 6 months for 1A/ 12 months for 1B, 1C] ･Examination of propeller shafts exposed in the engine room ･Records of wear down/clearance in the stern bearings ･Examination of maintenance records of the stern tube sealing devices ･Confirmation that the main engines have been operated out of the barred speed range for torsional vibration ･Examination of the sea water piping for water-lubricated stern tube bearings (1A) ･Operation test of L.O. low level alarms, Oil temperature measuring device, L.O. piping and L.O. circulating
C C C C C T
pumps (1B/1C) (2) Partial Survey/ Confirmation Survey of shafts of Kind 1B with oil-lubricated stern tube bearings -1. Partial Survey [3 years postponement from the date of completion of the partial survey] ･Examination by "Magnetic Particle Method" on propeller fitting parts (may be dispensed with for those with keyless attachment and flange connection where found in good condition) ･Clearances in stern tube or wear down of stern bearings
X M
･Opening-up examination of stern tube sealing device (may be dispensed with for keyless and flange type shafts
O
where found in good condition) ･L.O. tank low level alarms, oil temperature measuring devices, L.O. piping and L.O. circulating pumps
T
-2. Confirmation Survey [2 years postponement from the date of completion of the confirmation survey] It is confirmed within 3 years from the date of completion of Partial Survey above -1. That proper maintenance has been conducted for following items from the last Partial Survey. ･Record for lubricating oil sampling and analysis carried out regularly at intervals not exceeding 6 months since the partial survey (Each analysis data is to include water content, chlorides content, shaft metal content, bearing metal particle content and oil oxidation degree) ･Record for lubricating oil consumption rate since the partial survey ･Record for bearing temperature since the partial survey *Proper maintenance mentioned in above is to be conducted until next the Ordinary Survey X: General examination
O: Opening-up examination
M: Measurement
T: Performance test
C: Confirmation examination
- 23 -
C
GUIDANCE FOR UNDERGOING CLASS MAINTENANCE SURVEYS
SURVEY ITEMS (3) Partial Survey of shafts Kind 1C [5 years postponement
from the date of completion of the partial
survey] ･All items required in (2) -1. above ･Checking "Record for Monitoring System of Stern Tube Bearing and Oil Sealing Devices" (NK Form MT-3) X: General examination
O: Opening-up examination
M: Measurement
T: Performance test
C: Confirmation examination
- 24 -
X,M, O,T X
GUIDANCE FOR UNDERGOING CLASS MAINTENANCE SURVEYS
Table 5
Class Survey (Additional Requirements for Tankers) SURVEY ITEMS
SS
IS
AS
･Pump foundation and ventilation system in cargo pump room
X
X
X
･Cargo oil, fuel oil, ballast, vent pipes including vent masts and headers, inert gas pipes and all other
T
X
X
FACILITIES RELATED TO TANKER
pipings in cargo pump room and on weather decks a) pressure test (when deemed necessary by the surveyor.)
P
P
P
b) thickness measurement (When deemed necessary by the surveyor.)
M
M
M
･Earthing between hull structures and cargo tanks
X
X
･Electrical and mechanical remote operating and shut-off device for Cargo Oil Pump, Bilge Pump,
T
T
T
･Bilge system in pump room
T
T
T
･Level gauging system of cargo tank
T
T
T
･Pressure gauge on cargo discharge line
T
T
T
Ballast Pump and Stripping Pump in pump room
･Inert gas system a)
Inert gas blower, scrubber room ventilation system
T,O
T
T
b)
Deck water seal, non-return valve
T,O
T
c)
Remote control valve, Automatic control valve
T
T T
T
d)
Interlocking system between soot blower and shut-off valve on gas supply line
T
T
T
e)
Measuring system, Alarm system, Safety device (See the "I.G.S. Check List" for the details.)
T
T
T
･Fixed and portable gas detecting instruments and associated alarms
T
T
T
･Gauging devices for oxygen density
T
T
T
･Cargo oil piping and Ballast piping i.w.o. COTs, compartments adjacent to COTs and weather
T
X
X
T
T
T
M
M
X T
X T
decks. ･Inert gas generator ELECTRICAL INSTALLATION (DANGEROUS SPACE) ･Insulation resistance test (may be dispensed with where proper record is maintained and deemed appropriate by the Surveyor) ･Electrical installations in hazardous areas ･Interlocking device
- 25 -
GUIDANCE FOR UNDERGOING CLASS MAINTENANCE SURVEYS
SURVEY ITEMS
SS
IS
AS
X
X
X
I/M
I/M
I/M
X
X
X
As class requirements for Japanese Flag Ships OIL POLLUTION PREVENTION SYSTEM ･Segregated Ballast Tanks a) Pumps, pipings and valves b) confirmation of no contamination in tank ･Crude Oil Washing system (including units, means of communication, safety devices and hoses) a) Effectiveness b) pressure test and thickness measurement of piplines provided outside cargo oil tanks
C
C
P,T
P,T
c) Pumps
O
d) Pressure test at working pressure
P
e) Shut-off valves for steam heaters ･Oil discharge monitoring and control System
O,T
T
T
X
X
X
a) Flow meter (accuracy within ±15% )
T
T
b) Oil content meter (response time within 20 seconds)
T
T
c) Automatic and manual devices for stopping discharge of effluent
T
T
T
d) Indicating and recording devices
C
C
C
e) Audible or visible alarm devices
T
T
T
f) Starting interlock system
T
T
g) Corrections of oil content meters ･Oil / water interface detector
C
C
T
T
X
･Pumps, pipings and discharge arrangements
X
X
X
T
T
T
I,M
I,M
I,M
M
M
T
T
I,M
I,M
hand dipping) ･CBT arrangements
I,M
I,M
I,M
･Special ballast system
X
X
X
･Part flow system
X
X
X
a) Communication between observation position and discharge control position b) Verification of stripping in cargo tanks, slop tanks, pipelines and pump ･Additional ballast, arrival ballast tank – measurement of quantity of oil on surface / Arrival ballast tank - measurement by hand dipping (less than 0.085% of tank capacity) ･COW machine (for at least two cargo tanks) ･Cargo tank - at least 2 tanks except arrival/departure ballast tanks (confirmation by internal examination or hand dipping after crude oil washing, confirmation of effect of stripping by
I: Internal examination
P: Pressure test
X: General examination
O: Opening-up examination
M: Measurement
T: Performance test
- 26 -
C: Confirmation examination
GUIDANCE FOR UNDERGOING CLASS MAINTENANCE SURVEYS
Table 6
Class Survey (Additional Requirements for Ships Carrying Liquefied Gases) SURVEY ITEMS
SS
IS
AS
CARGO TANKS (For membrane and semi-membrane tanks, the examination and testing are to be carried out in accordance with an approved program for each tank system.) (Note) : Gas free/ventilation and removal of the insulation are to be prepared as required for conducting the following surveys.
･Internal examination of cargo tanks ･External examination of cargo tanks and their insulation
I
I*2
X
X*2
(If the visual examination of insulation of tanks is impossible, the examination of cold spots is to be carried out. However, in case where integrity of cargo tanks and their insulation is verified by the cargo log book, the examination of cold spots may be dispensed with.) ･Thickness gauging on tank plates ･Non-destructive test
M*1 X*1
(For independent tanks of Type B, the extent of non-destructive test is to be in accordance with an approved program.) (For independent tanks of Type C, non-destructive test can not be dispensed with totally.) ･Leak test on cargo tanks
X
(For independent tanks below deck, the leak test may be dispensed with, in case where no leakage is verified by the cargo log book.) ･Pressure test on cargo tanks
P*1
･Additional requirements for independent tanks of Type C Either of the following test (1) or (2) is to be carried out at the alternate Special Surveys, such as 2nd, 4th, 6th...:
P,X
(1) Pressure test and non-destructive test (2) Non-destructive test in accordance with an approved program HOLD SPACES AND SECONDARY BARRIERS ･Electrical bonding between independent cargo tanks and hull structure
X X
X
X*2
･For secondary barriers of membrane containment systems, verification of a specific level of tightness required in the system design in accordance with approved program. (For membrane containment systems with glued secondary barriers, evaluation of the values and
X*2
X
additional testing are carried out as necessary if the significant differeces of the value from previous results are observed.) ･Sealing arrangement for tanks or tank covers penetrating decks ･For other cargo containment systems, if the integrity of secondary barriers is not verified by a visual examination, the integrity is to be verified by pressure or vacuum test or other appropriate means. VENTING SYSTEM OF CARGO CONTAINMENT SYSTEM ・Pressure/vacuum relief valves for cargo tanks ・Sealing of pressure relief valves
X
X
X X*2
X O,T
X
X
C
C
C
O,T
X
X
(For pressure relief valves with non-metallic membranes in the main or pilot valves, such non-metallic membranes are to be renewed at intervals not exceeding three years or the approved interval.) ・Pressure/Vacuum relief devices and associated safety systems for interbarrier/hold spaces
- 27 -
GUIDANCE FOR UNDERGOING CLASS MAINTENANCE SURVEYS
SURVEY ITEMS
SS
IS
AS
X
X
CARGO AND PROCESSING PIPING (Note) Removal of the insulation is to be prepared where considered necessary by the surveyor.
・Piping
P*1
・All or a part of the total number of valves and associated fittings
O*1
・All or a part of the total number of pressure relief valves ・Sealing of pressure relief valves ・Electrical bonding between hull structures and piping, and between pipe flanges
O,T C X
*4
CARGO HANDLING SYSTEMS ・Emergency shut-off devices
T
T
T
・Cargo heat exchangers, vapourizers, pressure vessels
O*3,4,T
X
X
・Cargo pumps, cargo gas compressors, cargo gas blowers, their prime movers (Opening-up
O*4,T
X
X
・Pipings and their insulations
X
X
X
・Automatic and manual stopping devices for cargo pumps and compressors
T
T
T
inspection of electric motors may be dispensed with.)
・Equipment relating to refrigerant O*4
a) Pumps and compressors b) Condensers, receiver, inter-coolers, oil separators and relief valves
T
c) Leak test of pressure vessels and heat exchangers under the pressure of not less than 90 % of
P
the set pressure of relief valves d) Leak test of refrigerant piping system under the pressure of not less than 90 % of set
P
pressure of relief valves ・Drainage system for leaked cargo in interbarrier spaces and hold spaces
T
T
・Liquid level gauges, high level alarms and valves related to emergency shutdown system
T
T
T
・Temperature indication equipment and associated alarms
T
T
T
・Pressure gauges and associated alarms for cargo tanks, interbarrier spaces / hold spaces
T
T
T
・Fixed and portable gas detecting instruments and associated alarms
T
T
T
・O2 content meter
T
T
T
・Safety devices related to use of boil-off gas as fuel
T
T
T
・Gas free and purging systems and gas collecting devices for cargo tanks
X
X
X
・Inert gas generating system, inert gas storage system, dry air installation, gases for compensating
X
X
X
X
X
X
T
T
X
X
M
M
・Electrical installations in hazardous areas
X
X
・Interlocking devices
T
T
GAUGING DEVICES, GAS DETECTION INSTRUMENTS AND ASSOCIATED ALARMS
ENVIRONMENTAL CONTROL SYSTEM FOR HOLD SPACES
normal losses and drying agent ・Pressure control system for inert gas relevant system, means for preventing backflow of gases and monitoring system FIRE EXTINGUISHING ARRANGEMENT ・Test by delivering air for fixed piping and function test of alarms in enclose gas dangerous spaces ・Additional fireman’s outfits for flammable cargoes, fire fighting systems for gas dangerous closed spaces and alarming devices for emergency escape ELECTRICAL INSTALLATION *
Insulation resistance test of electrical circuits in gas dangerous spaces (may be dispensed with
where proper record is maintained and deemed appropriate by the Surveyor)
- 28 -
X
GUIDANCE FOR UNDERGOING CLASS MAINTENANCE SURVEYS
SURVEY ITEMS
SS
IS
AS
PERSONEL PROTECTION ・Decontamination shower and eye wash (if required to be installed)
T
T
T
・ Protection equipment, safety equipment, stretcher, medical first-aid equipment, respiratory
X
X
X
T
T
X
X
X
X
X
X
X
X
X
d) Fixed or portable trays or insulation for deck protection to be provided against cargo leakage
X
X
X
e) Gas-tight bulkhead penetrations including gas-tight shaft sealings, as far as accessible
X
X
X
f) Heating arrangements of structural hull steel, as far as accessible
X
X
X
g) Type approved cargo hoses
X
X
X
h) Earthing between hull structures and cargo pipes as far as accessible
X
X
X
i) Bow or stern loading and unloading arrangements and their related installations emergency
X
X
X
j) Electrical installations in gas dangerous spaces or areas
X
X
X
k) Cargo log book, operational records and manuals related to cargo containment system and cargo
C
C
C
C
C
C
protection for emergency escape purpose and shelter in emergency ・Air compressor (if provided for safety equipment) OTHERS a) Cross flooding equipment, watertight door, etc. which are provided in connection with the ship’s stability in damaged condition, as far as accessible. b) Closing devices of windows, doors and other openings wheelhouse and of those on exposed walls of superstructures and deckhouses as required and arrangements for the air locks c) Venting systems including their spare fans or impellers for enclosed spaces and compartments in cargo area
muster station and other equipment required for special cargoes
handling system l) The IMO Code for gas carriers or the Rules incorporating the provisions of the above-mentioned Code I: Internal examination
O: Opening-up examination
P: Pressure test
T: Performance test
M: Measurement
C: Confirmation examination
*1 : *2 :
X:
General examination
Where considered necessary by the surveyor At the first Annual Survey after the ship enters in service of carrying liquefied gases, where considered necessary by the surveyor.
*3 :
If internal examination of vessels is impracticable, pressure test of vessels and performance test of pressure relief valves are to be carried out.
*4 :
In the case where CMS is applied, the opening-up examination required at periodical surveys may be replaced by visual
inspection
- 29 -
GUIDANCE FOR UNDERGOING CLASS MAINTENANCE SURVEYS
Table 7
Class Survey (Additional Requirements for Ships Carrying Dangerous Chemicals in Bulk) SURVEY ITEMS
SS
IS
AS
・Sampling arrangements for cargoes from heating and cooling lines
X
X
X
・Closing devices of windows, doors and other openings of wheelhouse and of those on exposed walls of
X
X
X
・Pump discharge pressure gauges provided outside the pump rooms
X
X
X
・Insulation of piping
X
X
X
WEATHER DECK
superstructures and deckhouses as required
・Thickness gauging on tank plates
M
*1
CARGO PUMP ROOM ・Remote operating electrical and mechanical shutdown devices for cargo pumps and bilge system
T
T
T
・Personnel rescue arrangements in cargo pump room
X
X
X
・Equipment for cargo separation
X
X
X
・Ventilating system including spare fans or impellers for enclosed spaces and compartments in cargo
X
X
X
X
X
X
X
X
area ・System for flowback to land facilities of cargo liquid and its slop and vapour
*1
・Thickness gauging on tank plates
M
・Cargo pumps
O*2
・Pump foundation and ventilation system in cargo pump room
X
CARGO TANKS AND ASSOCIATED EQUIPMENTS ・Insulation of cargo containment (Removal of the insulation is required where considered necessary by
X
the Surveyor.) ・Foundation of cargo containment, including supports, keys and anti-rolling/anti-pitching devices
X
(Removal of the insulation is required where considered necessary by the Surveyor.) ・Sealing arrangement for tanks and tank covers penetrating decks
(Removal of the insulation
and
X
covers or performance test of closing devices may be required where considered necessary by the Surveyor.) ENVIRONMENTAL CONTROL SYSTEM FOR CARGO CONTAINMENTS AND SURROUNDING SPACES ・Equipment for inerting / padding / drying and gases for compensating normal losses and drying agents
X
X
X
・Monitoring system for environmental control for vapour spaces in cargo containments and void spaces
X
X
X
・Liquid level gauges, high level alarms and valves associated with overflow control system
T
T
T
・Gauging devices for liquid level, temperature, pressure, etc. of cargo containment system and
T
T
T
・Fixed and portable gas detecting instruments and the associated alarms
T
T
T
*
T
T
T
X
X
M
M
surrounding such cargo containments GAUGING, DETECTING AND ALARMING DEVICE
associated alarms O2 content meter
BONDING (Electrical bonding between hull structures and cargo piping) ELECTRICAL INSTALLATION *
Insulation resistance test of electrical circuits in gas dangerous spaces (may be dispensed with
where proper record is maintained and deemed appropriate by the Surveyor) *
Electrical installations in hazardous areas
X
X
*
Interlock devices
T
T
- 30 -
GUIDANCE FOR UNDERGOING CLASS MAINTENANCE SURVEYS
SURVEY ITEMS
SS
IS
AS
・Air blow test of fixed piping in gas dangerous spaces and performance test of alarm system
T
T
・Additional fireman’s outfits for flammable cargoes, fire fighting systems for gas dangerous closed
X
X
X
FIRE FIGHTING ARRANGEMENT
spaces and alarming devices for emergency escape CARGO OIL PIPING AND BALLAST PIPING WITHIN ALL CARGO TANKS, ALL TANKS AND
T
SPACES BOUNDING CARGO TANKS SUCH AS BALLAST TANKS, PUMP ROOMS, PIPE TUNNELS, COFFERDOAMS AND VOID SPACES AND ON WEATHER DECKS PERSONNEL PROTECTION ・Protection equipment
X
X
X
・Safety equipment
X
X
X
・Stretcher and medical first-aid equipment
X
X
X
・Decontamination shower and eye wash
T
T
T
・Respiratory protection for emergency escape purpose
X
X
X
・Air compressor (if provided for safety equipment)
X
X
X
X
X
X
b) Cargo sample storage arrangements
X
X
X
c) Bow and stern loading / unloading arrangements
X
X
X
d) Fixed or portable trays or insulation for deck protection to be provided against cargo leakage
X
X
X
e) Identification marks of pipe lines including pumps and valves
X
X
X
f) Drainage system from vent pipes
X
X
X
g) Type approved cargo hoses
X
X
X
h) Special arrangement in accordance with the special requirements for certain cargoes
X
X
X
i) Heating and cooling arrangements for cargoes
X
X
X
j) Electrical installations in gas dangerous spaces or areas
X
X
X
k) Cargo log book, operational records and manuals related to cargo containment system and cargo
C
C
C
C
C
C
OTHERS a) Cross flooding equipment, watertight door, etc. which are provided in connection with the ship’s stability in damaged condition, as far as accessible.
handling system l) The IMO Code for chemical tankers or the Rules incorporating the provisions of the above-mentioned Code
- 31 -
GUIDANCE FOR UNDERGOING CLASS MAINTENANCE SURVEYS
SURVEY ITEMS As class requirements for Japanese Flag Ships
SS
IS
AS
C
C
b) Prewashing machines (including type, capacity, number and locations)
X
X
X
c) Tank washing pipelines and wash water heaters
X
X
X
X
X
X
a) Servicing (including cargo record book)
C
C
b) Water test to confirm amount of residues from stripping (at least two cargo tanks)
T
PREVENTION SYSTEM FOR NOXIOUS LIQUID SUBSTANCES ・Prewashing system a) Servicing (When this is impracticable, confirmation may be done only by examining cargo record book.)
・Stripping system
・Discharge outlets below waterline
X
X
X
a) Discharge arrangements of residues
X
X
b) Discharge rate control devices
X
X
X
c) Discharge recording devices (Simulation test may be accepted.)
X
X
X
d) Flow meter (accuracy within ±15% )
C
C
・Arrangements for discharge to reception facilities
X
X
X
・Dilute water filling system
X
X
X
・Cargo heating system
X
X
X
・Ventilated washing system
X
X
X
・Wear of system, pumps and pipelines
X
・Shipboard Marine Pollution Emergency Plans for Noxious Liquid Substances
C
C
C
・Discharge recording devices of residues
O: Opening-up examination
M: Measurement
X: General examination
T: Performance test
P: Pressure test
C: Confirmation examination
*1 : Where considered necessary by the surveyor *2 : In the case where CMS is applied, the opening-up examination required at periodical surveys may be replaced by visual inspection
- 32 -
GUIDANCE FOR UNDERGOING CLASS MAINTENANCE SURVEYS
Table 8
Installation Survey (Automatic and Remote Control Systems) SURVEY ITEMS As class requirements for Japanese Flag Ships
M0 equipment ･Automatic and remote controls, safety devices and alarms ･Change-over devices of control positions & auxiliaries ･Black out test & sequential start of auxiliaries
AS/IS
T
T
T T T
･Communication systems
T
T
･Extension alarm ･Specific automatic MC equipment ･Automatic and remote controls, safety devices and alarms ･Change over system of control positions & auxiliaries ･Sequential start of auxiliary (Note) Where appropriate records of daily checks and periodical maintenance according to the "Periodical Inspection Table for Automatic and Remote Control System" (Form PIR-D-IV) throughout the period since the last periodical survey are kept, some of the tests may be dispensed with at the surveyor's discretion. T: Performance test
SS
G: General Examination
- 33 -
T
G
T
T
T T
GUIDANCE FOR UNDERGOING CLASS MAINTENANCE SURVEYS
Table 9
Installation Survey (Refrigerating Installation) SURVEY ITEMS
SS C*1
AS/IS C*1
T
T*2
Insulation resistance test (may be dispensed with where proper record is maintained and deemed
M
M
appropriate by the Surveyor) ･Compressors with their lubrication system (In case of screwed-type compressors or compressors
O*3
deemed appropriate by the Society, interval of opening-up may be taken as 25,000 running hrs.) ･Condenser cooling water pumps, primary ref. pumps and brine pumps
O*3
･Calibration check of thermometers in the chambers and of those for air in suction and delivery main stream (Records prepared by a reliable person may be accepted) ･Automatic controls, safety devices and alarms ･Electrical Installation
X
･Insulated ref. piping (Removing insulation to the extent necessary for checking their condition) ･Insulation in the refrigerated chambers (Boring the insulation where considered necessary in order to
X
determine the fullness and dryness.) ･Brine pipe system (Hydraulically tested to a pressure of 1.5 times the design pressure or 4 MPa,
P
whichever is greater.) ･Examination of water end covers of condenser(s) through inspection holes or other suitable openings ･Opening-up and pressure test of pressure vessels (pressure test may be dispensed with at SS No.1
X O*3,P*3
provide that the vessels are found to be in good condition ) ･Pressure relief valves (Adjusting of set-pressure)
C
･Operation test of refrigerating installation (The confirmation of the effectiveness of each unit under
T
operating condition. At this time, leak tests of refrigerant are to be carried out. When necessary, the concentration of brine is to be measured.) O: Opening-up examination
P: Pressure test
X: Other examination
M: Measurement
T: Performance test
C: Confirmation examination
*1
for random check
*2
if deemed necessary by the Surveyor
*3
see "EXPLANATORY NOTES ON CMS AND CRS" in case where continuous survey system is applied.
- 34 -
GUIDANCE FOR UNDERGOING CLASS MAINTENANCE SURVEYS
Table 10
Installation Survey (Life Saving Appliances of Ships Having SE Certificate) SURVEY ITEMS As class requirements for Japanese Flag Ships
SS
IS
AS
Log Book ・Confirmation of entries on drill and maintenance
C
C
C
Training Manuals, Instructions for on-board maintenance
C
C
C
Exhibition of Muster List, posters, etc.
C
C
C
release unit, marine evacuation system and inflatable lifejacket ・To be serviced by approved firms, service stations and/or by ship hand at least once a year. In the case of no approved firms/stations available, witness by the Surveyor is required.
X
X
X
Validity of equipment, etc. ・Confirmation of validity of food ration, drinking water, first-aid outfit, extinguishing medium, battery, pyrotechnic, hydrostatic release unit (disposable type), etc.
C
C
C
Lifeboat and rescue boat ・ Annual servicing and operation test of lifeboat, on-load release gear of lifeboat of 83N-ship type, etc. (including on-load release gear of free-fall lifeboat) and on-load release gear of rescue boat
C
X
X
C
X
X
T
T
T
T
Service of satellite EPIRB, radar transponder, two-way radio telephone apparatus, inflatable lifebuoy, compound rescue boat, inflatable liferaft, marshaling boat, hydrostatic
・ Annual servicing of launching appliances dynamic test of winch brake ・ Swing out test/ recovery test
T
・ Launching test (where deemed necessary by the Surveyor) ・ Boat fall (Renewal due to deterioration as deemed necessary or renewal at max. 60-monthly intervals) ・ Servicing (overhauling and load test under 1.1 x total mass of lifeboat at least once every 5 years) of on-load release gear of lifeboat of 83N-ship type, etc. (including on-load release gear of free-fall lifeboat) and on-load release gear of rescue boat ・ Servicing of launching appliances (service and dynamic test of winch brake with 1.1 x total mass of lifeboat at intervals not exceeding 5 years) ・ Operation test of engine Liferaft ・Inflatable liferaft to be serviced by approved service stations once a year or at an interval specified by the Administration. In the case of no approved firms/stations available, witness by the Surveyor is required. ・Annual servicing of launching appliances dynamic test of winch brake ・Boat fall (Renewal due to deterioration as deemed necessary or renewal at max. 60-monthly intervals) ・Servicing (overhauling and load test under 1.1 x total mass of liferaft at least once every 5 years) of automatic release hook of davit launched liferaft ・Servicing of launching appliances (service and dynamic test of winch brake with 1.1 x total mass of lifeboat at intervals not exceeding 5 years) Two-way radio telephone apparatus, on-board communications, general emergency alarm system, self-igniting light, emergency lighting, navigation lights T: Performance test
C: Confirmation examination
X: Other examination
- 35 -
M: Measurement
T
C
T/C
C
C
X
X
T/C
X
X
T
T
T
X
X
X
C
X
X
T/C
C
C
X
X
T/C
X
X
T
T
T
C
GUIDANCE FOR UNDERGOING CLASS MAINTENANCE SURVEYS
Table 11
Installation Survey (Navigational Equipment of Ships Having SE Certificate) SURVEY ITEMS As class requirements for Japanese Flag Ships
･Nautical publication, International Code of
Signals and IAMSAR manual
･Confirmation of service at approved firms, service stations and/or by ship hand at least once a year
SS
IS
AS
C
C
C
X
X
X
T
T
T
C
C
C
C
C
C
SS
IS
AS
C
C
C
T
T
for NAVTEX receiver, enhanced group call (EGC) receiver, VHF digital selective calling (DSC) encoder, VHF DSC watch receiver, DSC encoder, DSC watch receiver, Radars and Automatic Radar Plotting Aids, Automatic tracking aids, Electric plotting aid, GPS receiver and voyage data recorder. In the case of no approved firms/stations available, witness by the Surveyor is required. ･Confirmation on operation of daylight signaling lamp, magnetic compass, gyro-compass and repeater, transmitting heading device, track control system, electric draft display and information system, GPS, radar, Automatic Radar Plotting Aids (ARPA), automatic tracking aid, electric plotting aid, radar reflector, sound reception system, voyage date recorder, echo sounding device, speed and distance indicator, rudder angle indicator, propeller revolution rate indicator, pitch and operational mode indicator (variable pitch propeller), rate of turn indicator, (may be dispensed with where confirmed by test records) ･Annual test report of automatic identification system carried out by a radio firm approved by our society ･Residual deviation correction curve, residual deviation table for magnetic compass, calibration record of radio direction-finder and diagram of shadow sector for radar C: Confirmation examination
Table 12
T: Performance test
X: Other examination
Installation Survey (Lift of Japanese Flag Ships) SURVEY ITEMS As class requirements for Japanese Flag Ships
･Inspection record book of elevator (Including Mechanical pilot hoist) ･Opening-up examination of main part of hoisting machinery or driving system
O
･Load test (safety working load×1.1) (witness by the Surveyor may be dispensed with where test
T
result is confirmed by the service record, etc.) ･Performance test of communication system, safety device and emergency stop system O: Opening-up examination
C: Confirmation examination
- 36 -
T: Performance test
T
GUIDANCE FOR UNDERGOING CLASS MAINTENANCE SURVEYS
Table 13
Means of Access for the Surveys
1.Under deck areas SUBJECT In case that the depth of the webs is 1.5 m or less In case that the depth of the (a) the coating of the under deck webs is more than 1.5 m structure is in GOOD condition and there is no evidence of wastage (b) permanent means of access is provided in each bay to allow safe entry and exit Neither of the above conditions (a), (b)are met
MEANS OF ACCESS Boats or rafts alone may be allowed. Boats or rafts alone may be allowed.
Boats or rafts alone may be allowed. Boats or rafts alone may not be allowed. Staging or an other equivalent means is to be provided for the survey of the under deck areas.
2.Cargo hold shell frames of bulk carriers SUBJECT SURVEYS MEANS OF ACCESS Bulk carriers less than All periodical Some of the following means to be prepared 100,000DWT (a) Permanent staging and passages through structures surveys (b) Temporary staging and passages through structures (c) Portable ladder restricted to not more than 5m in length may be accepted for surveys of lower section of a shell frame including bracket (d) Hydraulic arm vehicles such as conventional cherry pickers, lifts and movable platforms (e) Boats or rafts provided the structural capacity of the hold is sufficient to withstand static loads at all levels of water (f) Other equivalent means Bulk carriers of Intermediate Some of the following means to be prepared 100,000DWT or surveys under 10 (a) Permanent staging and passages through structures more years of age and (b) Temporary staging and passages through structures Special survey (c) Hydraulic arm vehicles such as conventional cherry pickers, lifts and No.1 movable platforms (d) Boats or rafts provided the structural capacity of the hold is sufficient to withstand static loads at all levels of water (e) Other equivalent means Not only (a) to (e) but also a portable ladder fitted with a mechanical Annual surveys device to secure the upper end of the ladder is acceptable. Subsequent Some of the following means to be prepared Intermediate (a) Permanent staging and passages through structures Surveys (more than (b) Temporary staging and passages through structures 10 years) and (c) Hydraulic arm vehicles such as conventional cherry pickers for surveys subsequent Special of lower and middle part of frames surveys (No.2 or (d) lifts and movable platforms after) (e) Boats or rafts provided the structural capacity of the hold is sufficient to withstand static loads at all levels of water (f) Other equivalent means 3.Other structural members For other structural members, although our Guidance Part B does not specify the means of access in detail, easy and safe means of access for any surveyor is to be prepared.
- 37 -
GUIDANCE FOR UNDERGOING CLASS MAINTENANCE SURVEYS
Appendix 1 Timing of Periodical Survey and Anniversary Date (1)
Intermediate Survey (Commence – Complete) The intermediate survey for bulk carriers, oil tankers, ships carrying dangerous chemicals in bulk over 10 years of age and for general dry cargo ships (not less than 500 gross tonnage) over 15 years of age, may be commenced at the time of 2nd annual survey or after and be completed at the time of 2nd or 3rd annual survey. AD
6
(Jun)
1st AS
3
6
2nd AS
9
3
(Mar) (Jun) (Sep)
6
3rd AS
9
3
6
IS commence (2)
9
3
6
5th AS/SS
9
3
6
IS complete
Intermediate Survey (Occasional Survey – Complete) For the ships other than listed above (1), where examinations from the Intermediate Survey to be carried out during the period between the 2nd and 3rd Annual Surveys are carried out prior to the Intermediate Survey as Occasional Survey, said examinations to be carried out as part of the Intermediate Survey may be omitted. AD
6
(Jun)
1st AS
3
6
2nd AS
9
(Mar) (Jun) (Sep)
3
6
3rd AS
9 12
3
6
OS (3)
4th AS
4th AS
9
3
6
5th AS/SS
9
3
6
IS complete
Special Survey (Commence – Complete) Special survey may be commenced at 4th annual survey after classification survey or the last special survey and be progressed during the succeeding year with completion by the 5th anniversary date. AD 6
(Jun)
1st AS 3
6
2nd AS 9
(Mar) (Jun) (Sep)
3
6
3rd AS 9
3
6
4thAS 9
3
6
SS commence
- 38 -
5th AS/SS 9
3
6
SS complete
GUIDANCE FOR UNDERGOING CLASS MAINTENANCE SURVEYS
Appendix 2
Guidance for Undergoing Flag Change Survey
This guidance includes the normal procedure in case that the flag of ships is altered to new one and both flag authorities has authorized us to carry out statutory surveys / issue the statutory certificates. 1. Documents Please submit the followings to the Exclusive Surveyors’ Office of the Society (ClassNK) well in advance. For provisional registration, some flag states require a “Certificate of survey” (certificate for ship’s tonnage and specification of machinery) issued by class. As it is issued by head office, application is to be submitted to Survey Operations Headquarters of head office well in advance. In case that Safety Management Certificate (SMC) and/or International Ship Safety Certificate (ISPS) have been issued by ClassNK, please submit the Audit application, in addition to ; (1) Survey application (and Audit application for SMC and/or ISPS) (2) Copy of the Provisional Registration Certificate (3) Copy of the Radio Station License (4) Copy of the GMDSS Operator License 2. Preparations 1) Please rewrite port of registry and the new ship’s name, if applicable on the followings. (1) Both fore side shell and stern plate, lifeboats, liferaft container (also liferaft itself for certain flags), life buoys and lifejackets (2) Fire control plan *1, Life saving plan, Muster list, General arrangement, Capacity plan, Damage control plan, etc. (3) Shipboard Oil Pollution Emergency Plan (SOPEP) *2, Shipboard Marine Pollution Emergency Plan (SMPEP) *2, Oil Record Book *3, Loading Manual, etc. 2) Please conduct the necessary modifications and provide additional equipment imposed by the flag State, if necessary. *4 3. Radio survey Please arrange a radio inspector qualified by ClassNK to carry out the followings, and Initial survey of Safety Radio Certificate under the new flag State. (1) Re-programming MMSI Number into MF/HF-DSC, VHF-DSC, Satellite EPIRB (2) Re-programming Country code and ID Number into INMARSAT (3) Re-programming MMSI, Call-Sign and Ship’s Name (if altered) into AIS Please arrange the followings at survey. (1) Refitting New Call Sign board (2) Shore base maintenance agreement (3) Annual at-sea and shore-based maintenance report for EPIRB (4) Annual at-sea maintenance report for VDR (5) Confirmation Test for LRIT 4. Re-approval of documents The following manuals and booklets will be re-approved by the surveyor. (1) Loading Manual, Stability Information Booklet (2) Shipboard Oil Pollution Emergency Plan (SOPEP), Shipboard Marine Pollution Emergency Plan (SMPEP) (3) Cargo Securing Manual (4) Grain Loading Booklet (Necessary documents: Application, Copy of provisional registration certificate) *5 (5) Cargo gear register book and relevant certificates issued by ClassNK
- 39 -
GUIDANCE FOR UNDERGOING CLASS MAINTENANCE SURVEYS
5. Certificates issued by ClassNK The following certificates will be issued by ClassNK with relevant documents. (1) Tonnage Certificate (will be issued within 3 months after Flag change survey at the request of owner) Where particular change certificate is available on board, previous tonnage certificate is valid until the new certificate is issued or for a period not exceeding three (3) months by TM69 Convention. It is advised that previous certificate shall be kept on board until new certificate arrives. Please send an application to the Exclusive Surveyors’ Office of the Society (ClassNK) with the following documents for issuance of the certificate. Documents: 1. Application, 2. Copy of provisional registration certificate, 3. Sworn statement, 4. General arrangement (2) Grain Loading Certificate (will be issued by the Exclusive Surveyors’ Office of the Society (ClassNK) or ClassNK head office after re-approval of the Booklet) 6. Scope of surveys (IACS PR28) and Special requirements of each flag State Please contact the local survey office for information concerning surveys for Flag Change prior to the surveys. The surveyor in charge will notify the scope of surveys and the special requirements imposed by the Flag State, if any. Basically requirement is as follows; ・ If the flag change occurs within the appropriate time windows for the periodical surveys, the periodical surveys are required for issuance of statutory certificates. However a Dry-Docking for renewal survey of SC is not necessarily required. ・ If the flag change occurs outside of appropriate time windows for periodical surveys, the scope of the following surveys are required for issuance of statutory certificates. (the surveys are to be handled as additional surveys which are carried out solely for the purpose of the flag change) LL : Annual survey SC : Annual survey SE : Annual survey SR : Renewal survey / Periodical survey OPP : Annual survey SPP : Renewal survey APP : Annual survey GAS/ CHM/ NLS : Annual survey Passenger Ship Safety Cert. : SE + Lifesaving and Fire-fighting means and SR ・ Surveys conducted within a three months’ time period prior to the date of the flag change may be credited towards the flag change with the exception of SR survey. ・ If ClassNK was not authorized by the previous flag State Administration for survey and/or certification or if the losing flag State Administration was not a party to the relevant Convention, then appropriate initial/renewal surveys are to be carried out for LL, SE, SR, OPP and GAS/CHM/NLS.
7. Others When issuance of the followings are necessary because of change of the ship’s flag, please request the Exclusive Surveyors’ Office in advance. ・Dangerous Goods Fitness Certificate, ・IMSBC Code Fitness Certificate, ・Survey report of crew's accommodation (ILO Convention), ・Statement (MARPOL 73/78 Annex V), ・Carving and Marking Note
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GUIDANCE FOR UNDERGOING CLASS MAINTENANCE SURVEYS
8. Flag change from Japanese to those other Japanese In case that Loading Manuals/Stability Booklets/Cargo Securing Manual, etc. are written only in Japanese, those are to be written with a language easily understood by the ship’s master and annexed by English translation. The attending Surveyor confirms them in connection with re-approval of the documents as stated above 4.. Therefore, please arrange the adequate edition of manuals/booklets. (Note) *1 A certain flag state requires the fire control plan in compliance with IMO Resolution A.654(16). *2 A certain flag state approves SOPEP/SMPEP by themselves, not by ClassNK. *3 Designated oil record book is required for a certain flag vessel. *4 In case of reduction of the height of eye related to Navigation Bridge Visibility from 1,800 mm, the approval by the new flag administration should be required. Please refer to “Safety Management System, Handbook for ISM Audit” regarding an audit for Safety Management Certificate (SMC) related to Flag Change, in case that SMC has been issued by ClassNK. If you have any further questions for the above, please do not hesitate to contact with the ClassNK Exclusive Surveyors’ Office at your convenient or head office, Survey Operations Headquarters.
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GUIDANCE FOR UNDERGOING CLASS MAINTENANCE SURVEYS
Appendix 3
EXPLANATORY NOTES ON CMS AND CRS
CONTENTS I. EXPLANATORY NOTES ON CONTINUOUS MACHINERY SURVEY (CMS) 1. Scope............................................................................................................................................................42 2. Application...................................................................................................................................................42 3. Application Procedure ................................................................................................................................ 45 4. Schedule of CMS ........................................................................................................................................ 46 5. Substitution for Open-up Inspection ........................................................................................................... 46 6. Confirmatory Survey .................................................................................................................................. 47 7. Cancellation of CMS System ...................................................................................................................... 48 II.
EXPLANATORY
NOTES
ON
CONTINUOUS
SURVEY
OF
CARGO
REFRIGERATING
INSTALLATIONS (CRS) 1. Scope........................................................................................................................................................... 49 2. Application.................................................................................................................................................. 49 3. Application Procedure ................................................................................................................................ 49 4. Schedule of CRS ......................................................................................................................................... 49 5. Substitution for Open-up Inspection ........................................................................................................... 49 6. Confirmatory Survey .................................................................................................................................. 49 7. Cancellation of CRS System ....................................................................................................................... 49 APPENDIX A. Form of “Application for CMS”, “Application for CMS/CRS” ................................................................ 50 B. Form of “Schedule of CMS”, “Schedule of CMS/CRS” ........................................................................... 52 C. Form of “Chief Engineer’s Report” ......................................................................................................... 54
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GUIDANCE FOR UNDERGOING CLASS MAINTENANCE SURVEYS
I. EXPLANATORY NOTES ON CONTINUOUS MACHINERY SURVEY (CMS) 1. Scope The Continuous Machinery Survey (CMS) System is to aim to grasp the general condition of the whole machinery and equipment by opening up a part of the machinery and equipment through reasonable procedures in a continuously and systematically planned manner. This, of course, can only be achieved when the attending Surveyor is provided with accurate information on the ship’s side maintenance at every occasion of CMS. The points of CMS system are as follows: (1) The survey items of CMS specified in Chapt. 9, Part B of the Rules may be overhauled and examined according to the ship’s maintenance schedule in such a manner that all of them are opened up for survey once within a cycle not exceeding 5-year period. (2) Conditions of those items of machinery and equipment which have not been opened up at the survey are evaluated from the results of the open-up inspection of the similar machinery and equipment together with the records of the systematic inspection scheme in line with the ship’s maintenance schedule. This system may prove a preventive measure to avoid possible damage in the future for those items of machinery and equipment which have not been opened at the survey, and thus can cooperate with the ship’s maintenance work without disturbance of planned maintenance schedule. (3) If any defects are found on machinery, equipment or parts which have been opened up in the course of CMS, open-up survey on similar machinery, equipment or parts may be required by the attending Surveyor. 2. Application The CMS system applies to those items of machinery and equipment of well experienced type. The following machinery and equipment are applicable to CMS system. ① Main propulsion machinery (i) Steam turbines Turbine rotors together with bearings, casings, couplings between turbine and reduction gears, nozzle valves, maneuvering valves (ii) Diesel engines Cylinder covers, cylinder liners, pistons (together with piston pins and piston rods), crosshead pins and their bearings, connecting rods, crank pins and their bearings, crank journals and their bearings, camshafts and their driving gears, turbo-chargers, auxiliary blowers, air inter-coolers, attached essential pumps (e.g. bilge pumps, L.O. pumps, F.O. pumps and cooling water pumps) ② Power transmission system and main shafting Reduction gears, claw couplings, fluid couplings, flexible couplings, thrust shafts and their bearings, intermediate shafts and their bearings
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GUIDANCE FOR UNDERGOING CLASS MAINTENANCE SURVEYS
Main and auxiliary generator engines including port-use generator engine, emergency generator engines, other engines used for essential auxiliaries ③ Air compressors, blowers Main and auxiliary starting air compressors (excluding those for emergency use), air compressors for control system, forced draft fans for boiler(excluding the same for boilers with a maximum evaporation of 3 tons/h or less) ④ Cooling water pumps Circulating pumps for main steam turbine, jacket cooling fresh water/sea water pumps, piston cooling fresh water/oil pumps, fuel valve cooling fresh water/oil pumps, turbo-charger cooling fresh water/sea water pumps, main cooling sea water pumps, cooling sea water pumps for L.O. cooler, cooling fresh water/sea water pumps for generator, sea water service pumps, air cooler cooling fresh water pumps ⑤ F.O. pumps F.O. supply pumps, F.O. service pumps, F.O. transfer pumps, F.O. circulating pumps, boiler burning pumps (excluding those for boilers with a maximum evaporation of 3 tons/h or less) ⑥ Lubricating oil pumps L.O. pumps for main engine, L.O. pumps for camshaft, L.O. Pumps for reduction gear, L.O. pumps for controllable pitch propeller (C.P.P.), stern tube L.O. pumps (excluding the case where stern tube L.O. system by natural circulation in an emergency case is also available), thermal oil circulating pumps, exhaust gas value operation oil pumps, rocker arm L.O. pumps, crosshead L.O. pumps, system oil pumps (pumps for feeding oil to hydraulic systems for control and adjustment of essential auxiliaries for propulsion) ⑦ Feed water pumps, condensate pumps, drain pumps Feed water pumps, boiler water circulating pumps, condensate pumps (for main turbines, generator turbines, cargo oil pump turbines, ballast pump turbines), drain pumps ⑧ Bilge pumps, ballast pumps, fire pumps Bilge pumps (excluding those for oily water separators), ballast pumps, G.S. pumps, fire pumps (excluding emergency fire pumps) ⑨ Condensers, feed water heaters Main condensers, auxiliary condensers, gland condensers, atmospheric condensers, dirty steam condensers, vent condensers, drain coolers feed water heaters, deairators ⑩ Cooler Main fresh water coolers (for cylinder jackets and pistons) F.O. valve cooling fresh water/oil coolers, fresh water coolers for turbo-chargers, fresh water coolers for generator engines, F.O. coolers, main L.O. coolers, turbo-charger L.O. coolers, camshaft L.O. coolers, reduction gear L.O. coolers, control oil coolers, L.O. coolers for C.P.P., stern tube L.O. coolers, L.O. coolers for generator turbines, air cooler cooling fresh water coolers, F.O. coolers ⑪ Oil heaters F.O. heaters and L.O. heaters (excluding electric heaters having a capacity of 10 kw or less)
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GUIDANCE FOR UNDERGOING CLASS MAINTENANCE SURVEYS
⑫ F.O. tanks (having a capacity of more than 1m3 which do not form part of the ship’s structure) F.O. settling tanks and service tanks (for main and auxiliary engines), F.O. tanks for boilers ⑬ Air reservoirs (main, auxiliary, control, emergency air reservoirs) ⑭ Cargo oil pumping installation Cargo oil pumps (including chemical, liquid gas pumps), stripping pumps, tank cleaning pumps, tank cleaning heaters and drain coolers, drain coolers for cargo oil heaters ⑮ Deck machinery Steering gears, windlass, mooring winches (including their hydraulic oil pumps) ⑯ Evaporators (for boiler water to use for driving steam turbines) ⑰ Other items of machinery and equipment which the Society considers to be covered by CMS 3. Application Procedure (1) Where the CMS system is applied, the procedures are as follows: ① New ships (i) One copy each of the forms of ‘’Application for CMS’’ and ‘’Schedule of CMS’’ (as shown in Appendix A and B respectively), and this ‘’Explanatory Notes’’ will be sent to the shipowner from the Head Office in about 3 months after completion of the Classification Survey. (ii) The shipowner should submit each one copy of the ‘’Application for CMS’’ filled with necessary information, and ‘’Schedule of CMS’’ to Classification Department of Head Office or the Survey Office prior to the first CMS survey. (iii) Two copies (one for the shipowner and one for the ship) will be returned to the applicant with following endorsement in the ‘’Application for CMS’’, signed by General Manger of Classification Department or the Survey Office. Accepted the application for Continuous Machinery Survey System to the ship. (port)
(Date) (Signature) name title
② Existing ships (in such cases as being subjected to the Classification Survey of Ships not Built under the Society’s Survey) (i)
The inspection items applicable to CMS are decided by the Society referring to the record of CMS survey carried out by the previous Society.
(ii) After the classification survey, the application procedures are correspondingly same as shown in ① above. (2) It is a usual way that an application for CMS is submitted before first periodical survey after the classification survey but this submission may be acceptable at any time.
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GUIDANCE FOR UNDERGOING CLASS MAINTENANCE SURVEYS
4. Schedule of CMS (1) Details of Schedule of CMS The ‘’Schedule of CMS’’ should be prepared referring to the items ① to ③ below and be kept on board the ship for reference to the attending Surveyor. ① All items for CMS should be included in the programme. ② All items of CMS should be completed within a cycle of five years. ③ Open-up schedule of the machinery and equipment should be planned to enable the attending Surveyor to evaluate the condition of the whole system by the results of the open-up inspection. (2) Amendment of Schedule of CMS CMS Survey should be carried out within the due date in compliance with the accepted ‘’Schedule of CMS’’. In case where the ship’s maintenance programme is modified in the process of implementation, the accepted “Schedule of CMS” kept on board the ship may be amended and the survey may be carried out accordingly. When defects were found on a part during survey, thorough examination may be required on the other similar parts of the machinery or equipment despite the schedule of the ‘’Schedule of CMS’’.
5. Substitution for Open-up Inspection As for the following machinery and equipment, the inspections by Surveyor mentioned below may be substituted for the open-up inspection providing that it is verified they have been in good working conditions through the reviewal of the relevant log books or other records at the time of the survey. However, in case where it is found they are not in order at the inspection or they have not been opened-up for a long period, open-up inspection may be required. (1) Oil pumps (excluding cargo oil pumps) and hydraulic deck machinery (including oil motors for driving cargo oil pumps) Visual inspection including the checks on the oil strainers and the sampling oil, also
inspection under
operating condition (2) Oil tanks and oil heaters Visual inspection (3) Cooling fresh water pumps, blowers and fans Visual inspection and inspection under operating condition (4) Auxiliary Diesel engines that are not normally used at sea with total running hours of less than 7,000 hrs from the last open-up inspection Visual inspection and inspection under operating condition
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GUIDANCE FOR UNDERGOING CLASS MAINTENANCE SURVEYS
6. Confirmatory Survey (1) Procedure for Confirmatory Survey Where any of the machinery and equipment listed in (2) is opened up at sea and inspected by the Chief Engineer in routine maintenance work, such inspection may be accepted as Confirmatory Survey as equivalent to open-up inspection under supervision of the Surveyor provided that the maintenance records are kept in order and in compliance with the following ①～④. ① One copy of the inspection record including the following items on the machinery and equipment inspected by the chief engineer should be submitted to the attending Surveyor. (Refer to the Appendix C, “Chief Engineer’s Report”) (i)
Signature of the chief engineer and license number
(ii) Date and place of the inspection (iii) Inspection items and their results (iv) Operating conditions before and after the inspection ② Parts replaced with spares or repaired should be kept onboard until the confirmation by the Surveyor. (If this part would not be kept onboard, it is required to take and keep the photograph.) ③ Visual inspection should be made for the main engine, and inspection under operating condition as well as visual inspection should be made for the other machinery. ④ Visual inspection of lubricating oil conditions should be carried out through open-up inspections, etc. of the lubricating oil filters of crankshafts, main bearings, crankpin bearings, crankpin bolts as well as the camshafts and camshaft driving devices of main diesel engines. ⑤ Visual inspection to confirm the current conditions and the lubricating oil maintenance conditions of intermediate shafts, thrust shafts and bearings should be carried out as far as possible. ⑥ Confirmation of the open-up inspection and adjustment records of safety valves (excluding fusible plugs) should be carried out for air reservoirs. ⑦ As a result of the confirmatory survey stated in ① through
above,
open-up
inspection
and/or
re-inspection may be required where deemed necessary by the Surveyor. (2) Machinery applicable for Confirmatory Survey Items of machinery applicable for confirmatory survey are as follows: ① Main diesel engine ② Diesel engines used for driving main generators, important auxiliaries for main propulsion of the ship and those for the safety of life and the ship However, confirmatory survey may only be acceptable when the Surveyor can confirm the followings by the record and/or photograph. (i)
The engine was completely opened up and a careful examination was made on all cylinder units, cylinder liners, cylinder covers, cylinder cover valves, piston, piston rings, connecting rods and top and bottom end bearings, piston pins, camshaft driving gear, turbo-chargers, air intercoolers, crankcase and crankcase doors, engine foundation bolts, and crankcase
safety valves.
(ii) The top halves of all main bearings were removed and one or two bottom halves were taken out for examination. (iii) An examination was made on all crankpins and journals to detect cracks, especially at fillets and - 47 -
GUIDANCE FOR UNDERGOING CLASS MAINTENANCE SURVEYS
areas in the vicinity of oil holes, and oil grooves of the crankshaft. (iv) Crank web deflections were measured and recorded. (v) Weardowns of the cylinder liners were measured and recorded. (vi) The L.O. cooler attached to the engine, L.O. pumps, cooling water pumps, etc. of direct driven type were opened up and examined. (vii)The service hours of crankpin bolts were checked and recorded. ③ Intermediate shafts, thrust shafts and bearings ④ Auxiliary machinery (air compressors, pumps, heat exchangers, deck machinery, evaporators) (3) Time of open-up inspection by the Chief Engineer Each machinery and equipment defined 6.(2) above applicable for Confirmatory Survey is to be opened up within due date subject to compliance with the (1) above. (4) Time of Confirmatory Survey by the Surveyor The open-up inspection record by the Chief Engineer is to be submitted to the Surveyor on or before the forthcoming periodical survey. 7. Cancellation of CMS System (1) Where shipowner or its representative requests the cancellation of the CMS system, the normal survey system should henceforth be applied. If there are any items of machinery and equipment whose intervals of inspection would exceed 5 years at the next SS, they should be inspected within 5 year from the last inspection (2) When non-compliance with this Guidance is found, the application of the CMS system may be canceled by the Society. The procedures to be taken henceforth should be in accordance with that shown in (1) above. (3) Where the shipowner is changed, the application of CMS system should be canceled. When the new shipowner intends to continue the application of the CMS system, a new application as prescribed in 3. should be re-submitted. In this case, it is acceptable to continue the schedule of CMS prepared by the previous shipowner.
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GUIDANCE FOR UNDERGOING CLASS MAINTENANCE SURVEYS
II. EXPLANATORY NOTES ON CONTINUOUS SURVEY OF CARGO REFRIGERATING INSTALLATIONS (CRS) 1. Scope Refer to I.1., Continuous Machinery Survey (CMS) system. 2. Application CRS is applicable to the following items. (1) Compressors (2) Condenser cooling water pumps (3) Primary refrigerant pumps. (4) Brine pumps (5) Condensers (6) Evaporators (7) Other items of refrigerating installations with the Society considers appropriate 3. Application Procedure Refer to I.3., Continuous Machinery Survey (CMS) system. 4. Schedule of CRS Refer to I.4., Continuous Machinery Survey (CMS) system. 5. Substitution for Open-up Inspection (1) For screw compressors or other compressors specifically approved by the Society, visual inspection and inspection under operating condition may be substituted for open-up inspection subject to confirmation of working conditions, reviewal of log books and other records. However, in case where they have not been opened-up for a long period, open-up inspection may be required. (2) For the compressor to which the inspection of item (1) is applied, open-up inspection is to be carried out when the total running hour after last open-up inspection becomes 25,000 hours and over. 6. Confirmatory Survey (1) Procedure for confirmatory survey Refer to I.6.(1)., Continuous Machinery Survey (CMS) system. (2) Items of refrigerating installations acceptable for confirmatory survey are as follows: ① Compressors Open-up inspection of at least one unit of compressors should be carried out by the Surveyor within one cycle of CRS. ② Condenser cooling water pumps ③ Primary refrigerant pumps ④ Brine pumps
7. Cancellation of CRS System Refer to I.7., Continuous Machinery Survey (CMS) system. - 49 -
GUIDANCE FOR UNDERGOING CLASS MAINTENANCE SURVEYS
Form CMS-1E (2008.5)
Appendix A-1 To: NIPPON KAIJI KYOKAI Date: Applicant (Ship Management Company)： Address： TEL: FAX:
Application for Continuous Machinery Survey (CMS)
We hereby request the application for CMS to the following ship. Ship’s Name: Class No.: Type of Main Engine:
We assure you that the arrangement on CMS will be made on the following conditions. 1.One cycle of CMS is to be completed within five years. 2.The survey schedule for each item of the machinery and equipment is to preferably be planned in such a way that the conditions of other machinery and equipment can be assumed from the result of an open-up inspection of the machinery and equipment.
Applicant’s Signature:
Attachment: Schedule of Continuous Machinery Survey(CMS) (for NK Use)
Distribution:
Original: NK Head Office 1 Copy: Ship’s File 1 Copy: Shipowner
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GUIDANCE FOR UNDERGOING CLASS MAINTENANCE SURVEY Form CMS/CRS-1E (2008.5)
Appendix A-2 To: NIPPON KAIJI KYOKAI Date: Applicant (Ship Management Company)： Address： TEL: FAX:
Application forContinuous Machinery Survey (CMS)/ Continuous Survey of Cargo Refrigerating Installations (CRS)
We hereby request the application for CMS/CRS to the following ship. Ship’s Name: Class No.: Type of Main Engine:
We assure you that the arrangement on CMS/CRS will be made on the following conditions. 1.One cycle of CMS/CRS is to be completed within five years. 2.The survey schedule for each item of the machinery and equipment is to preferably be planned in such a way that the conditions of other machinery and equipment can be assumed from the result of an open-up inspection of the machinery and equipment.
Applicant’s Signature:
Attachment: Schedule of Continuous Machinery Survey(CMS)/ Continuous Survey of Cargo Refrigerating Installations(CRS) (for NK Use)
Distribution:
Original: NK Head Office 1 Copy: Ship’s File 1 Copy: Shipowner
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GUIDANCE FOR UNDERGOING CLASS MAINTENANCE SURVEYS
Appendix B-1 Schedule of Continuous Machinery Survey (CMS)
M/S“NIPPON MARU”
Form CMS-2 (1/1)
Class Number: 045678
Main Diesel Engine Type x No.: 6S70MC x 1 NO.1 CYLINDER COVER OF M/E NO.2 CYLINDER COVER OF M/E NO.3 CYLINDER COVER OF M/E NO.4 CYLINDER COVER OF M/E NO.5 CYLINDER COVER OF M/E NO.6 CYLINDER COVER OF M/E NO.1 CYLINDER LINER OF M/E NO.2 CYLINDER LINER OF M/E NO.3 CYLINDER LINER OF M/E NO.4 CYLINDER LINER OF M/E NO.5 CYLINDER LINER OF M/E NO.6 CYLINDER LINER OF M/E NO.1 PISTON OF M/E NO.2 PISTON OF M/E NO.3 PISTON OF M/E NO.4 PISTON OF M/E NO.5 PISTON OF M/E NO.6 PISTON OF M/E NO.1 CROSSHEAD PIN & BEARING OF M/E NO.2 CROSSHEAD PIN & BEARING OF M/E NO.3 CROSSHEAD PIN & BEARING OF M/E NO.4 CROSSHEAD PIN & BEARING OF M/E NO.5 CROSSHEAD PIN & BEARING OF M/E NO.6 CROSSHEAD PIN & BEARING OF M/E NO.1 CRANKPIN & BEARING OF M/E NO.2 CRANKPIN & BEARING OF M/E NO.3 CRANKPIN & BEARING OF M/E NO.4 CRANKPIN & BEARING OF M/E NO.5 CRANKPIN & BEARING OF M/E NO.6 CRANKPIN & BEARING OF M/E
2008 ×
2009
2010
2011
2012
× × × × × × × × × × × × × × × × × × × × × × × × × × × × ×
- the end -
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2013
GUIDANCE FOR UNDERGOING CLASS MAINTENANCE SURVEY
Appendix B-2 Schedule of Continuous Machinery Survey (CMS) and Continuous Survey of Cargo Refrigerating Installations(CRS) M/S“NIPPON MARU”
Form CMS/CRS-2 (1/1)
Class Number: 045678
Main Diesel Engine Type x No.: 6S70MC x 1 NO.1 CYLINDER COVER OF M/E NO.2 CYLINDER COVER OF M/E NO.3 CYLINDER COVER OF M/E NO.4 CYLINDER COVER OF M/E NO.5 CYLINDER COVER OF M/E NO.6 CYLINDER COVER OF M/E NO.1 CYLINDER LINER OF M/E NO.2 CYLINDER LINER OF M/E NO.3 CYLINDER LINER OF M/E NO.4 CYLINDER LINER OF M/E NO.5 CYLINDER LINER OF M/E NO.6 CYLINDER LINER OF M/E NO.1 PISTON OF M/E NO.2 PISTON OF M/E NO.3 PISTON OF M/E NO.4 PISTON OF M/E NO.5 PISTON OF M/E NO.6 PISTON OF M/E NO.1 CROSSHEAD PIN & BEARING OF M/E NO.2 CROSSHEAD PIN & BEARING OF M/E NO.3 CROSSHEAD PIN & BEARING OF M/E NO.4 CROSSHEAD PIN & BEARING OF M/E NO.5 CROSSHEAD PIN & BEARING OF M/E NO.6 CROSSHEAD PIN & BEARING OF M/E NO.1 CRANKPIN & BEARING OF M/E NO.2 CRANKPIN & BEARING OF M/E NO.3 CRANKPIN & BEARING OF M/E NO.4 CRANKPIN & BEARING OF M/E NO.5 CRANKPIN & BEARING OF M/E NO.6 CRANKPIN & BEARING OF M/E Refrigerating Machinery NO.1 CARGO REF. COMPRESSOR NO.2 CARGO REF. COMPRESSOR NO.3 CARGO REF. COMPRESSOR NO.3 CARGO REF. COMPRESSOR NO.1 CARGO REF. CONDENSER NO.2 CARGO REF. CONDENSER NO.1 CARGO REF. COOL. S.W. PUMP NO.2 CARGO REF. COOL. S.W. PUMP
2008 ×
2009
2010
2011
2012
2013
× × × × × × × × × × × × × × × × × × × × × × × × × × × × × 2008 ×
2009
2010
2011
× × × × × × ×
- the end -
- 53 -
2012
2013
GUIDANCE FOR UNDERGOING CLASS MAINTENANCE SURVEY
Appendix Appendix C-1 C-1
To Class NK
Chief Engineer’s Report for CMS Confirmatory Survey Ship’s Name：
Flag：
Class No.：
Owner’s Name (Management Company’s Name)：
C/E’s Name：
Nationality of C/E：
C/E’s License No.：
Validity of C/E’s License：
Country who issued License ：
No. of License endorsed by the flag：
I, the undersigned Chief Engineer of the above ship, have carried out “Open-up Inspection” of the CMS Items as reported in the attached “Detailed Report of Open-up Inspection” (Appendix C-2). Total No. of machinery/equipment inspected by C/E: Date of Signature of C/E: Signature of C/E ： (C/E’s Name)
(
)
Confirmatory Survey by NK Surveyor I, the undersigned surveyor, have carried out “Confirmatory Survey” of the CMS Items inspected by Chief Engineer in open-up condition, and confirmed that all of the CMS Items are maintained in good order, or placed to good working order. Date: Port:
(Signature)
(
Surveyor to ClassNK
)
This format is to be used to report the results of C/E’s open-up inspection according to the 9.1.2, Part B of NK Rules. In case where any machinery and equipment defined in 6(2) is to be opened up within due date by the Chief Engineer, this Report is to be prepared and submitted to the Surveyor on or before the forthcoming periodical survey. This Report is to be prepared 2 sets and 1 set is to be put in NK survey record File with endorsement by the Surveyor.
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GUIDANCE FOR UNDERGOING CLASS MAINTENANCE SURVEY
Appendix C-2
Details of Open-up Inspection by C/E Name & No. of machinery/equipment：
Date of C/E’s inspection：
Condition before and after reassembly：
Contents of overhaul/inspection/maintenance/repair etc： (measurement records attached : Yes or No)
Name of parts replaced/repaired： (photographs attached : Yes or No )
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page （
/
Place of Inspection：
）
GUIDANCE FOR UNDERGOING CLASS MAINTENANCE SURVEYS
Appendix 4 Detail of Hull Survey
This part includes the detailed guidelines for hull survey as follows . Appendix 4-1 Part 1 Part 2 Part 3 Part 4 Part 5 Part 6 Part 7 Part 8 Part 9 Part 10
Close-up Survey and Thickness Measurement at each Special Survey Single Hull Oil & Chemical Tankers Double Hull Oil & Chemical Tankers Double Hull Oil Tankers built under Part CSR-T of the Rules Bulk Carriers (except double-side skin) (note1) Double Skin Bulk Carriers (note1) Bulk Carrier built under Part CSR-B of the Rules Ore Carriers Ships Carrying Liquefied Gases in Bulk General Dry Cargo Ships Other Cargo Ships (note2)
Appendix 4-2 Suspect Area Appendix 4-3 Additional Thickness Measurement Appendix 4-4 Close-up Survey and Thickness Measurement at Intermediate Survey and Annual Survey Appendix 4-5 Diminution Limits and Judgement of Steel in Hull Structure and Equipment Appendix 4-6 Guidelines for Coating Assessment for Ballast Tanks of Tankers note1) Although, the ships mentioned as BULK CARRIER in SOLAS certificate, the ships need to be applied to the requirements of General Dry Cargo Ships in case ESP (ENHANCED SURVEY PROGRAMME) is not affixed in Classification Certificate. note2) Following kind of ships to be considered as Other Cargo Ships. Container Carriers Dedicated Forest Product Carriers (except for ships carrying lumber cargoes) Ro-Ro Cargo Ships Car Carriers Refrigerated Cargo Ships Dedicated Wood Chip Carriers Dedicated Cement Carriers Supply Vessels (including Tug Boat, Barge and etc.) Ships of double side-skin construction, with double side-skin extending for entire length of the cargo area, and for the entire height of the cargo hold to the upper deck
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GUIDANCE FOR UNDERGOING CLASS MAINTENANCE SURVEYS
Appendix 4-1 Close up survey and Thickness measurement at each Special survey Part 1 Single Hull Oil & Chemical tankers This part includes the outline of close-up surveys and thickness measurements required in Part B of Rules at each special survey of oil tankers or chemical tankers.
Structures and terminology of typical oil tankers
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GUIDANCE FOR UNDERGOING CLASS MAINTENANCE SURVEYS
Special Survey No.1 (Single Hull Oil & Chemical Tankers)
(ship’s age ≤ 5 years)
1. Close-up Survey
Tanks One ballast wing tank or ballast tank in double hull compartment (in the case no ballast tank is arranged, a cargo wing tank used primarily for water ballast) One cargo tank One ballast tank One cargo wing tank One cargo center tank
Subject members One transverse ring*1 One deck transverse *2 Lower parts of one transverse bulkhead*3
*1: Cross Ties and complete transverse web frame ring including adjacent structural members such as shell plates, longitudinal bulkhead, longitudinal stiffeners, brackets, etc. *2: Deck transverse in tank or on deck including adjacent deck structural members such as deck plates, longitudinal stiffeners, brackets, etc. *3: Transverse bulkhead including vertical and horizontal girders and adjacent structural members (such as longitudinal bulkheads, inner bottom plating, bottom girders, brackets, stiffeners, etc.) *4: Deck and bottom transverse including adjacent structural members such as deck plating, bottom plating, longitudinal stiffeners, etc. *5: Additional transverse ring including adjacent structural members such as shell plates, longitudinal bulkhead, longitudinal stiffeners, brackets, etc.
2. Thickness measurement -1. Suspect areas (See Appendix 4-2.) -2. Structural members subject to Close-up Survey (See above 1.) -3. Systematic thickness measurement (See the figure below.) (1) Each strake of one section of deck plating for the full beam of the ship within the cargo area (in way of a ballast water tank) -4. Standards for measuring points are referred to.
(Upper Deck Plan) WBT
WBT
(Bottom Plan)
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GUIDANCE FOR UNDERGOING CLASS MAINTENANCE SURVEYS
Special Survey No.2 (Single Hull Oil & Chemical Tankers)
(5 years < Ship’s age ≤ 10 years)
1. Close-up Survey
Tanks Subject members One ballast wing tank or ballast tank in double hull compartment -All Trans. Rings*1 (in the case no ballast tank is arranged, a cargo wing tank used -Both Trans. Bulkheads*3 primarily for water ballast) Each remaining ballast tank -Each one Deck Trans.*2 -Lower parts of each one Trans. Bulkhead*3 One cargo wing tank -One Deck Trans.*2 -Lower parts of one Transverse Bulkhead*3 Two cargo center tanks -Each one Deck Trans.*2 -Lower parts of each one Trans. Bulkhead*3
*1 to *5 : Refer to Special Survey No.1.
2. Thickness measurement -1. Suspect areas (See Appendix 4-2.) -2. Structural members subject to Close-up Survey (See above 1.) -3. Systematic thickness measurement (See the figure below.) (1)Each deck plate within the cargo area (2)All longitudinal members in one transverse section within the cargo area When the selected section is a transversely framed section, adjacent frames and their end connections in way of the transverse section are to be included. (3)Wind and water strakes outside cargo area (at least one strake on each side) -4. Standards for measuring points are referred to.
LWL
BWL
Cargo Area (Upper Deck Plan) WBT
WBT
(Bottom Plan)
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GUIDANCE FOR UNDERGOING CLASS MAINTENANCE SURVEYS
Special Survey No.3 (Single Hull Oil & Chemical Tankers)
(10 years < Ship’s age ≤ 15 years)
1. Close-up Survey
Subject members All transverse rings*1 All transverse bulkheads*3 One cargo wing tank All transverse rings*1 Remaining cargo wing tanks A minimum of 30% of all trans. ring*1 All cargo tanks All transverse bulkheads*3 All cargo center tanks A minimum of 30% of all deck trans.*4 A minimum of 30% of all bottom trans.*4 As considered necessary by the Surveyor [only for Oil Tanker] *5 All ballast tanks
Tanks
*1 to *5 : Refer to Special Survey No.1.
2. Thickness measurement -1. Suspect areas (See Appendix 4-2.) -2. Structural members subject to Close-up Survey (See above 1.) -3. Systematic thickness measurement (See the figure below.) (1)Each deck plate within the cargo area (2)All longitudinal members in two transverse sections within the cargo area (note) When the selected section is a transversely framed section, adjacent frames and their end connections in way of the transverse section are to be included. (3)Wind and water strakes inside the cargo area (all strakes on each side) (4)Wind and water strakes outside the cargo area (at least one strake on each side) (note) Transverse sections are to be selected in consideration of (a), (b) and (c) below. (a) One transverse section within 0.4L of the hull girder length and the other transverse section between 0.4L and 0.5L amidships are to be chosen. (b) Transverse sections should be chosen such that thickness measurements can be taken for as many different tanks in corrosive environments as possible. Ballast tanks sharing a common plane boundary with cargo tanks fitted with heating coils and cargo tanks permitted to be filled with sea water should be selected where present. (c) Transverse sections should be located where the largest thickness reductions are suspected to occur or are revealed from deck plating measurements prescribed in (1) above and should be clear of areas which have been locally renewed or reinforced. -4 Internals in FPT&APT -5. Standards for measuring points are to be referred to.
LWL BWL
Cargo Area (Upper Deck Plan) WBT
WBT
WBT
WBT
(Bottom Plan)
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GUIDANCE FOR UNDERGOING CLASS MAINTENANCE SURVEYS
Special Survey No.4 and Subsequent(Single Hull Oil & Chemical Tankers)
(15 years < Ship’s age)
1. Close-up Survey
Tanks Same as Special Survey No.3
Subject members
2. Thickness measurement -1. Suspect areas (See Appendix 4-2.) -2. Structural members subject to Close-up Survey (See above 1.) -3. Systematic thickness measurement (See the figure below.) (1)Each deck plate within the cargo area (2)Each bottom plate within the cargo area (3)All longitudinal members in three transverse sections within the cargo area (note) When the selected section is a transversely framed section, adjacent frames and their end connections in way of the transverse section are to be included. (4)All wind and water strakes (5) All exposed main deck plating outside the cargo area (6) Representative exposed superstructure deck plating (7) All keel plate full length and bottom plates in way of cofferdams and machinery spaces and aft end of tanks (note) Refer to Special Survey No.3. -4. Internals in FPT&APT -5. Plating of sea chests (Shell plating in way of overboard discharges as deemed necessary) -6. Standards for measuring points are to be referred to.
LWL BWL
Cargo Area (Upper Deck Plan)
(Bottom Plan)
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GUIDANCE FOR UNDERGOING CLASS MAINTENANCE SURVEYS
Standards for Measuring Points (Single Hull Oil & Chemical Tanker)
-1. Thickness measurement for the structural members subject to close-up survey Standards of measuring points for the structural members subject to close-up survey such as trans. ring, etc. are shown in the figures below. Taking into account of the ship’s age and structural system of the members, the number of measuring points is to be adjusted as appropriate. -2. Thickness measurement for transverse section, etc. (1) Belt gauging -Platings: Every deck flange and bottom flange should be measured at one point between longitudinals. All the other platings should be measured at one point per strake. -Longitudinals: Every longitudinal should be measured on the web and face plate. (2) Thickness measurement for shell platings, deck platings, etc. Two points are to be measured in each plate of side shell, bottom shell, upper deck, etc. where thickness measurements of all plates or along the length of the plate are required. -3. Substantial corrosion Where substantial corrosion is found through the results of thickness measurements, extent of thickness measurement (number of structural members and measuring pints) is to be increased in accordance with the direction of the Surveyor and with requirements specified in Appendix 4-3.
0.1D
0.1D
Trans. Web Section
Belt Gauging
Horiz. Girder
C.L. Girder Tight Bulkhead
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GUIDANCE FOR UNDERGOING CLASS MAINTENANCE SURVEYS
Part 2 Double Hull Oil & Chemical Tankers This part includes the outline of close-up surveys and thickness measurements required in Part B of Rules at each special survey of double hull oil tankers.
Structures and terminology of typical double hull oil tankers
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GUIDANCE FOR UNDERGOING CLASS MAINTENANCE SURVEYS
Special Survey No.1 (Double Hull Oil & Chemical Tankers)
(ship’s age ≤ 5 years)
1. Close-up Survey
Tanks One ballast tank in double hull compartment*7 One cargo tank One center cargo tank One cargo wing tank*8
Subject members One transverse ring*1 One transverse bulkhead*3 One deck transverse *2 One transverse bulkhead*4
*1: Cross ties and complete transverse web frame ring including adjacent structural members such as shell plates, longitudinal frames, brackets, etc. *2: Deck transverse in tank or on deck including adjacent deck structural members such as deck plating, longitudinal stiffeners, brackets, etc. *3: Transverse bulkhead complete in ballast tanks, including girder system and adjacent structural members, such as longitudinal bulkheads, inner bottom plating, girders in double bottom tanks, hopper side, connecting brackets, etc. *4: Transverse bulkhead lower part in cargo tank, including girder system and adjacent structural members, (such as longitudinal bulkheads) and internal structure of lower stool, where fitted *5: Deck and bottom transverse including adjacent structural members such as deck plating, bottom plating, longitudinal stiffeners, etc. *6: The knuckle area and the upper part (5 meters approximately, in case chemical tanker 3 meters), including adjacent structural members. Knuckle area is the area of the web frame around the connections of the slope hopper plating to the inner hull bulkhead and the inner bottom plating, up to 2 meters from the corners both on the bulkhead and the double bottom *7: Double hull compartment- including compartments of Double bottom, wing and double deck (if any), even if they are different compartment *8: Where no center cargo tanks are fitted (as in the case of center longitudinal bulkhead) transverse bulkheads in wing tanks are to be surveyed. *9: Additional transverse ring including adjacent structural members such as shell plates, longitudinal frames, brackets, etc.
2. Thickness measurement -1. Suspect areas (See Appendix 4-2.) -2. Structural members subject to Close-up Survey (See above 1.) -3. Systematic thickness measurement (See the figure below.) (1) Each strake of one section of deck plating for the full beam of the ship within the cargo area (in way of a ballast water tank) -4. Refer to standards for measuring points. (Upper Deck Plan)
(Bottom Plan)
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GUIDANCE FOR UNDERGOING CLASS MAINTENANCE SURVEYS
Special Survey No.2 (Double Hull Oil & Chemical Tankers)
(5 years < Ship’s age ≤ 10 years)
1. Close-up Survey
Tanks One ballast tank in double hull compartment*7
Subject members All transverse rings*1 The knuckle area and upper part of one trans. ring*6 One deck transverse*5 One transverse bulkhead*3
Remaining ballast tanks*7 Two cargo tank All ballast tanks in double hull compartment*7 Two center cargo tanks One cargo wing tank*8
One transverse bulkhead*4
*1 to *9 : Refer to Special Survey No.1.
2. Thickness measurement -1. Suspect areas (See Appendix 4-2.) -2. Structural members subject to Close-up Survey (See above 1.) -3. Systematic thickness measurement (See the figure below.) (1)Each deck plate within the cargo area (2)All longitudinal members in one transverse section within the cargo area When the selected section is a transversely framed section, adjacent frames and their end connections in way of the transverse section are to be included. (3)Wind and water strakes outside cargo area (at least one strake on each side) -4. Refer to Standards for measuring points.
LWL
BWL
Cargo Area
WBT
(Upper Deck Plan)
WBT
(Bottom Plan)
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GUIDANCE FOR UNDERGOING CLASS MAINTENANCE SURVEYS
Special Survey No.3 (Double Hull Oil & Chemical Tankers)
(10 years < Ship’s age ≤ 15 years)
1. Close-up Survey
Subject members All transverse rings*1 All transverse bulkheads*3 One cargo tank All transverse rings*1 Remaining cargo tanks One transverse ring*1 All cargo tanks All transverse bulkheads*3 Additional transverse rings as deemed necessary by the Surveyor [Only for Oil Tanker] *9 All ballast tanks
Tanks
*1 to *9 : Refer to Special Survey No.1.
2. Thickness measurement -1. Suspect areas (See Appendix 4-2.) -2. Structural members subject to Close-up Survey (See above 1.) -3. Systematic thickness measurement (See the figure below.) (1)Each deck plate within the cargo area (2)All longitudinal members in two transverse sections within the cargo area (note) When the selected section is a transversely framed section, adjacent frames and their end connections in way of the transverse section are to be included. (3)Wind and water strakes outside the cargo area (at least one strake on each side) (4)Wind and water strakes inside the cargo area (all strakes on each side) (note) Transverse sections are to be selected in consideration of (a), (b) and (c) below. (a) One transverse section within 0.4L of the hull girder length and the other transverse section between 0.4L and 0.5L amidships are to be chosen. (b) Transverse sections should be chosen such that thickness measurements can be taken for as many different tanks in corrosive environments as possible. Ballast tanks sharing a common plane boundary with cargo tanks fitted with heating coils and cargo tanks permitted to be filled with sea water should be selected where present. (c) Transverse sections should be located where the largest thickness reductions are suspected to occur or are revealed from deck plating measurements prescribed in (1) above and should be clear of areas which have been locally renewed or reinforced. -4. Internals in FPT&APT -5. Refer to Standards for measuring points.
LWL BWL
Cargo Area (Upper Deck Plan) WBT
WBT
WBT
WBT
(Bottom Plan)
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GUIDANCE FOR UNDERGOING CLASS MAINTENANCE SURVEYS
Special Survey No.4 and Subsequent (Double Hull Oil & Chemical Tankers)
(15 years < Ship’s age)
1. Close-up Survey
Tanks Same as Special Survey No.3
Subject members
2. Thickness measurement -1. Suspect areas (See Appendix 4-2.) -2. Structural members subject to Close-up Survey (See above 1.) -3. Systematic thickness measurement (See the figure below.) (1)Each deck plate within the cargo area (2)Each bottom plate within the cargo area (3)All longitudinal members in three transverse sections within the cargo area (note) When the selected section is a transversely framed section, adjacent frames and their end connections in way of the transverse section are to be included. (4)All wind and water strakes (5) All exposed main deck plating outside the cargo area (6) Representative exposed superstructure deck plating (7) All keel plate full length and bottom plates in way of cofferdams and machinery spaces and aft end of tanks (note) Refer to Special Survey No.3. -4. Internals in FPT&APT -5. Plating of sea chests (Shell plating in way of overboard discharges as deemed necessary) -6. Standards for measuring points are referred to.
LWL BWL
Cargo Area (Upper Deck Plan)
(Bottom Plan)
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GUIDANCE FOR UNDERGOING CLASS MAINTENANCE SURVEYS
Standards for Measuring Points (Double Hull Oil Tanker)
-1. Thickness measurement for the structural members subject to close-up survey Standards of measuring points for the structural members subject to close-up survey such as trans. ring, etc. are shown in the figures below. Taking into account of the ship’s age and structural system of the members, the number of measuring points is to be adjusted as appropriate. -2. Thickness measurement for transverse section, etc. (3) Belt gauging -Platings: Every deck flange and bottom flange should be measured at one point between longitudinals, all the other platings should be measured at one point per strake. -Longitudinals: Every longitudinal should be measured on the web and face plate (4) Thickness measurement for shell platings, deck platings, etc. Two points are to be measured in each plate of side shell, bottom shell, upper deck, etc. where thickness measurements of all plates or along the length of the plate are required. -3. Substantial corrosion Where substantial corrosion is found through the results of thickness measurements, extent of thickness measurement (number of structural members and measuring pints) is to be increased in accordance with the direction of the Surveyor and with requirements specified in Appendix 4-3.
0.1D
0.1D
Trans. Web Section
Belt Gauging
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GUIDANCE FOR UNDERGOING CLASS MAINTENANCE SURVEYS
Part 3 Double Hull Oil Tankers built under Part CSR-T of the Rules This chapter includes the outline of close-up surveys and thickness measurements for Double Hull Oil Tankers built under Part CSR-T of the Rules in addition to the requirements mentioned in Part 2. At Special Surveys for double hull oil tankers built under Part CSR-T of the Rules, when thickness measurements are carried out, interpretations specified in the following Table are also to be considered for the number and location of thickness measurement. The locations of the points to be measured are to be given for the most important of the structure. Interpretations of rule requirements for the number and location of thickness measurements for CSR double hull oil tankers Item Selected plates Deck, bottom plates and wind-and-water strakes Transverse section
Transverse rings (1) in cargo and ballast tanks
Transverse bulkheads in cargo tanks
Transverse bulkheads in ballast tanks
Adjacent members
structural
Interpretation «Selected» means at least a single point on one out of three plates, to be chosen as representative areas of average corrosion. At least two points on each plate to be taken either at each 1/4 extremity of plate or at representative areas of average corrosion.
Reference
Measurements to be taken on all longitudinal members (i.e., plating, longitudinals and girders, etc.) at the deck, side, bottom, longitudinal bulkheads, inner bottom and hopper. One point to be taken on each plate. Both web and flange to be measured on longitudinals, if applicable. For tankers older than 10 years of age: • Within 0.1D (where D is the ship’s moulded depth) of the deck and bottom at each transverse section to be measured, • Every longitudinal and girder is to be measured on webs and face plates • Every plate is to be measured at one point between longitudinals. • At least two points on each plate in a staggered pattern and two points on the corresponding flange, where applicable. • Minimum 4 points on the first plate below deck. Additional points in way of curved parts. • At least one point on each of two stiffeners between stringers / longitudinal girders. • At least two points on each plate. Minimum 4 points on the first plate below main deck. • At least one point on every third stiffener to be taken between each stringer. • At least two points on each plate of stringers and girders, and two points on the corresponding flange. Additional points in way of curved parts. • Two points of each diaphragm plate of stools (if fitted). • At least 4 points on plates between stringers / longitudinal girders, or per plate if stringers / girders are not fitted. • At least two points on each plate of stringers and girders, and two points on the corresponding flange. Additional points in way of curved parts. • At least one point on two stiffeners between each stringer / longitudinal girder. • On adjacent structural members, one point per plate and one point on every third stiffener / longitudinal.
Fig. (A)
Fig. (B)
Fig. (C)
Fig. (D)
(1) “Transverse rings” means all transverse material appearing in a cross-section of the ship's hull in way of a double bottom floor, vertical web and deck transverse
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GUIDANCE FOR UNDERGOING CLASS MAINTENANCE SURVEYS
Fig. (A) Example of locations subject to thickness measurements in transverse sections (double hull oil tankers)
Fig. (B) Example of locations subject to thickness measurements on transverse rings in cargo and ballast tanks (double hull oil tankers)
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GUIDANCE FOR UNDERGOING CLASS MAINTENANCE SURVEYS
Fig. (C) Example of locations subject to thickness measurements on transverse bulkheads in cargo tanks (double hull oil tankers)
Fig. (D) Example of locations subject to thickness measurements on transverse bulkhead in ballast tanks (double hull oil tankers)
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GUIDANCE FOR UNDERGOING CLASS MAINTENANCE SURVEYS
Part 4 Bulk Carriers (except double skin bulk carriers) This chapter includes the outline of close-up surveys and thickness measurements required in Part B of Rules at each special survey of bulk carriers* except double skin bulk carriers specified in Part 2-2. *: "Bulk Carriers" means following ships: ships constructed or converted with a single deck, top-side tanks and hopper side tanks in cargo area and intended primarily to carry dry cargo in bulk (See the figure below); or ore carriers; or combination carriers such as ore/oil carriers and ore/bulk/oil carriers. (Note) For bulk carriers with hybrid cargo hold arrangement, e.g. with some cargo holds of single side skin and others of double side skin, the requirements for Double Skin Bulk Carriers are to apply to cargo holds of double side skin and associated wing spaces.
Structures and terminology of typical bulk carriers
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GUIDANCE FOR UNDERGOING CLASS MAINTENANCE SURVEYS
Special Survey No.1 (Bulk Carriers except double side skin)
(ship’s age ≤ 5 years)
1. Close-up Survey Compartments and tanks All cargo holds
Subject members · A sufficient number (at least 1/4 of the total number) of shell frames at the forward, middle, and aft parts on both sides of forward cargo hold*1 · Selected frames in remaining cargo holds*1 · Two selected trans. bulkheads*2*4 · Air pipes and sounding pipes in way of tank top · All cargo hatch covers and coamings*2 Each two representative water ballast tanks of each · Each one trans. ring*3 type (i.e. top side, hopper side or side tank) *1: Including end attachments and adjacent shell plating *2: Including stiffeners *3: Including plating and longitudinal, similar primary members in the case of no trans. rings are arranged *4: Close-up Surveys of transverse bulkheads are to be carried out at least at four levels as specified as follows: (1) Immediately above the inner bottom and immediately above the line of gussets (if fitted) and shedders for ships without lower stool. (2) Immediately above and below the lower stool shelf plate (for those ships fitted with lower stools), and immediately above the line of the shedder plates. (3) About mid-height of the bulkhead. (4) Immediately below the upper deck plating and immediately adjacent to the upper wing tank, and immediately below the upper stool shelf plate for those ships fitted with upper stools, or immediately below the topside tanks. *5: Complete transverse web frame ring including adjacent structural members such as shell plates, longitudinal frames, brackets, etc. *6: Transverse bulkhead lower part including girder system and adjacent members such as brackets, stiffeners, etc. *7: Transverse bulkhead complete including girder system and adjacent members such as brackets, stiffeners, etc. *8: Including adjacent deck structural members such as deck plates, longitudinal beams, etc. 2. Thickness measurement -1. Suspect areas (See Appendix 4-2.) -2. Structural members subject to Close-up Survey (See 1. above.) -3. Standards for measuring points are referred to.
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GUIDANCE FOR UNDERGOING CLASS MAINTENANCE SURVEYS
Special Survey No.2 (Bulk Carriers except double side skin)
(5 years < Ship’s age ≤ 10 years)
1. Close-up Survey Compartments and tanks All cargo holds
Subject members · All hold frames in forward cargo hold*1 · A sufficient number (at least 1/4 of the total number for ships less than 100,000 DWT and at least 1/2 of the total number for ships of 100,000 DWT or more) of shell frames in each of the remaining cargo holds · All complete trans. bulkheads*2*4 · All area of deck plating and under deck structure inside line hatch opening between cargo hold hatches · Air pipes and sounding pipes in way of tank top · All piping arrangements in cargo holds · All cargo hatch covers and coamings*2 · Each one trans. ring*3
Water ballast tanks
· Both trans. bulkheads*2
One water ballast side tank *1 to *8: Refer to Special Survey No.1.
2. Thickness measurement -1. Suspect areas (See Appendix 4-2.) -2. Structural members subject to Close-up Survey (See 1. above.) -3. Systematic thickness measurement (See the figure below) (1)Selected areas of deck plating inside line of openings between cargo hold hatches (2)Two trans. Sections of deck plating, outside line of cargo hatch openings within the cargo length area (3)Wind and water strakes in way of the trans. sections considered under the above (2) (4)All deck plating, where log cargoes or other cargoes accelerating corrosion are loaded (5)Wind and water strakes outside the cargo length area (at least one strake on each side) -4. Standards for measuring points are to be referred to
LWL BWL
Cargo Length Area
(Upper Deck Plan)
(Bottom Plan)
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GUIDANCE FOR UNDERGOING CLASS MAINTENANCE SURVEYS
Special Survey No.3 (Bulk Carriers except double side skin)
(10 years < Ship’s age ≤ 15 years)
1. Close-up Survey Compartments and tanks All cargo holds
Subject members · All hold frames in the forward hold*1 · A sufficient number (at least 1/2 of the total number) of shell frames in each of the remaining cargo holds*1 · All complete trans. bulkheads*2*4 · All area of deck plating and under deck structure inside line hatch opening between cargo hold hatches · Air pipes and sounding pipes in way of tank top · All piping arrangements in cargo holds · All cargo hatch covers and coamings*2 · All trans. rings*3 · All trans. bulkheads*2
All water ballast tanks *1 to *8: Refer to Special Survey No.1.
2. Thickness measurement -1. Suspect areas (See Appendix 4-2.) -2. Structural members subject to Close-up Survey (See 1. above.) -3. Systematic thickness measurement (See the figure below) (1)Each deck plate within cargo length area (2)All longitudinal members in two transverse sections, one in the amidship area, at deck plating outside line of cargo hatch openings within the cargo length area (3)All wind and water strakes within the cargo length area (4)Selected wind and water strakes outside the cargo length area -4. Internals in FPT&APT -5. Standards for measuring points are to be referred to.
LWL BWL
Cargo Length Area
(Upper Deck Plan)
(Bottom Plan)
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GUIDANCE FOR UNDERGOING CLASS MAINTENANCE SURVEYS
Special Survey No.4 and subsequent (Bulk Carriers except double side skin)
(15 years < Ship’s age)
1. Close-up Survey Compartments and tanks All cargo holds
Subject members · All hold frames*1 · All complete trans. bulkheads*2*4 · All area of deck plating and under deck structure inside line hatch opening between cargo hold hatches · Air pipes and sounding pipes in way of tank top · All piping arrangements in cargo holds · All cargo hatch covers and coamings*2 · All trans. rings*3 · All trans. bulkheads*2
All water ballast tanks *1 to *8: Refer to Special Survey No.1.
2. Thickness measurement -1. Suspect areas (See Appendix 4-2.) -2. Structural members subject to Close-up Survey (See 1. above.) -3. Systematic thickness measurement (See the figure below) (1)Each exposed main deck plate and selected exposed superstructure deck plate (2)All longitudinal members in three transverse sections, one in the amidship area, at deck plating outside line of cargo hatch openings within the cargo length area (3)Each bottom plate within the cargo length area (4)All wind and water strakes (5)All keel plates full length (6)Bottom plates in way of cofferdams and machinery spaces and aft end of tanks -4. Internals in FPT&APT -5. Plating of sea chests (Shell plating in way of overboard discharges as deemed necessary) -6. Standards for measuring points are to be referred to.
LWL BWL
Cargo Length Area
(Upper Deck Plan)
(Bottom Plan)
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GUIDANCE FOR UNDERGOING CLASS MAINTENANCE SURVEYS
Standards for Measuring Points (Bulk Carriers except double side skin)
-1. Thickness measurement for the structural members subject to close-up survey Standards of measuring points for the structural members subject to close-up survey (such as trans. ring, etc.) are shown in below figures. Taking into account of the ship’s age and structural system of the members, the number of measuring points is to be adjusted as appropriate. For Ore Carriers, standards of measuring points for structural members in wing ballast tanks and wing void spaces, should be referred to those for oil tankers. -2. Thickness measurement for transverse section, etc. (1) Belt gauging -Platings : Every deck flange and bottom flange should be measured at one point between longitudinals. All the other platings should be measured at one point per strake. -Longitudinals : Every longitudinal should be measured on the web and face plate. (2) Thickness measurement for shell platings, deck platings, etc. Two points are to be measured in each plate of side shell, bottom shell, upper deck, etc. where thickness measurements of all plates or along the length of the plate are required. (3) Thickness measurement for hold frames Hold frames and their end brackets are to be measured at position within 30mm from the weld of hold frames to side shell, bilge hopper plate or top side bottom plate. -3. Thickness measurement for members where substantial corrosion is found Where substantial corrosion is found through the results of thickness measurements, extent of thickness measurement (number of structural members and measuring points) is to be increased in accordance with the direction of the Surveyor and with requirements specified in Appendix 4-3.
0.25h
Trans. Bulkhead
Belt Gauging
:Requirement for UR S19 h
0.25h
Trans. Ring
Hatch Cover & Coaming Hold Frame (Requirement for UR S31) Hatch Coaming
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GUIDANCE FOR UNDERGOING CLASS MAINTENANCE SURVEYS
Part 5
Double Skin Bulk Carriers (excluding Ore Carriers)
This chapter includes the outline of close-up surveys and thickness measurements required in Part B of Rules at each special survey of double side skin bulk carriers*. *: "Double Skin Bulk Carriers" are ships, which belongs to bulk carriers specified in (13) above, in which all cargo holds are bounded by a double-side skin (regardless of the width of the wing space). (note) 1. For bulk carriers with hybrid cargo hold arrangement, e.g. with some cargo holds of single side skin and others of double side skin, the Requirements for Double Skin Bulk Carriers are to apply to cargo holds of double side skin and associated wing spaces. 2. A double side tank of double skin bulk carriers is to be considered as a separate tank even if it is in connection to either the topside or the bilge hopper tank.
Structures and terminology of typical bulk carriers Upper deck longitudinal
Hatch side coaming Hatch end coaming Upper deck plating
Side longitudinal in top side tank Upper stool Transverse in top side tank
Side longitudinal in side tank
Diaphra
Vertical strake of top side tank
Top side tank sloping plating Transverse corrugated bulkhead
Side shell plating Shedder plate Longitudinal bulkhead Bilge hopper slanting plating Side longitudinal in bilge hopper tank
Transverse in bilge hopper tank
Lower stool Inner bottom plating Inner bottom longitudinal Side girder
Bottom shell plating Bottom longitudinal
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Center girder
C.L.
GUIDANCE FOR UNDERGOING CLASS MAINTENANCE SURVEYS
Special Survey No.1 (Double Skin Bulk Carriers)
(ship’s age ≤ 5 years)
1. Close-up Survey Compartments and tanks All cargo holds
Subject members · Two selected trans. bulkheads*1*3 · Air pipes and sounding pipes in way of tank top · All cargo hatch covers and coamings*1 · Each one trans. ring*2
Each two representative water ballast tanks of each type (at least including the foremost topside and double side tanks on either side) *1: Including stiffeners and girders *2: Including plating and longitudinal, similar primary members in the case of no trans. rings are arranged *3: Close-up Surveys of transverse bulkheads are to be carried out at least at four levels as specified as follows: (1) Immediately above the inner bottom and immediately above the line of gussets (if fitted) and shedders for ships without lower stool. (2) Immediately above and below the lower stool shelf plate (for those ships fitted with lower stools), and immediately above the line of the shedder plates. (3) About mid-height of the bulkhead. (4) Immediately below the upper deck plating and immediately adjacent to the upper wing tank, and immediately below the upper stool shelf plate for those ships fitted with upper stools, or immediately below the topside tanks. 2. Thickness measurement -1. Suspect areas (See Appendix 4-2.) -2. Structural members subject to Close-up Survey (See 1. above.) -3. Standards for measuring points are referred to.
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GUIDANCE FOR UNDERGOING CLASS MAINTENANCE SURVEYS
Special Survey No.2 (Double Skin Bulk Carriers)
(5 years < Ship’s age ≤ 10 years)
1. Close-up Survey Compartments and tanks All cargo holds
Subject members · All complete trans. bulkheads*1*3 · All area of deck plating and under deck structure inside line hatch opening between cargo hold hatches · Air pipes and sounding pipes in way of tank top · All piping arrangements in cargo holds · All cargo hatch covers and coamings*1 · Both transverse bulkhead*1*3
Each one representative water ballast tanks of each type (i.e. top side, hopper side or side tank) Remaining water ballast tanks · Each one trans. ring*3 Foremost double side tanks *1 to *3: Refer to Special Survey No.1.
· At least 1/4 of total number of stiffeners (trans. web frames or longitudinals) on side shell or longitudinal bulkhead at fore/middle/aft part of both sides
2. Thickness measurement -1. Suspect areas (See Appendix 4-2.) -2. Structural members subject to Close-up Survey (See 1. above.) -3. Systematic thickness measurement (See the figure below.) (1)Selected areas of deck plating inside line of openings between cargo hold hatches (2)Two trans. Sections of deck plating, outside line of cargo hatch openings within the cargo length area (3)Wind and water strakes in way of the trans. sections considered under the above (2) (4)All deck plating, where log cargoes or other cargoes accelerating corrosion are loaded (5)Wind and water strakes outside the cargo length area (at least one strake on each side) -4. Standards for measuring points are to be referred to.
LWL BWL Cargo Length Area
(Upper Deck Plan)
(Bottom Plan)
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GUIDANCE FOR UNDERGOING CLASS MAINTENANCE SURVEYS
Special Survey No.3 (Double Skin Bulk Carriers)
(10 years < Ship’s age ≤ 15 years)
1. Close-up Survey Compartments and tanks All cargo holds
Subject members · All complete trans. bulkheads*1*3 · All area of deck plating and under deck structure inside line hatch opening between cargo hold hatches · Air pipes and sounding pipes in way of tank top · All piping arrangements in cargo holds · All cargo hatch covers and coamings*1 · All trans. rings*2 · All trans. bulkheads*1*3 · At least 1/4 of total number of stiffeners (trans. web frames or longitudinals) on side shell or longitudinal bulkhead at fore/middle/aft part of both sides
All water ballast tanks All double side tanks
*1 to *3: Refer to Special Survey No.1.
2. Thickness measurement -1. Suspect areas (See Appendix 4-2.) -2. Structural members subject to Close-up Survey (See 1. above.) -3. Systematic thickness measurement (See the figure below) (1)Each deck plating within cargo length area (2)All longitudinal members in two transverse sections, one in the amidship area, at deck plating outside line of cargo hatch openings within the cargo length area (3)All wind and water strakes within the cargo length area (4)Selected wind and water strakes outside the cargo length area -4. Internals in FPT&APT -5. Standards for measuring points are to be referred to.
LWL BWL
Cargo Length Area
(Upper Deck Plan)
(Bottom Plan)
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GUIDANCE FOR UNDERGOING CLASS MAINTENANCE SURVEYS
Special Survey No.4 and subsequent (Double Skin Bulk Carriers)
(15 years < Ship’s age)
1. Close-up Survey Compartments and tanks All cargo holds
All water ballast tanks All double side tanks *1 to *3: Refer to Special Survey No.1.
Subject members · All complete trans. bulkheads*1*3 · All area of deck plating and under deck structure inside line hatch opening between cargo hold hatches · Air pipes and sounding pipes in way of tank top · All piping arrangements in cargo holds · All cargo hatch covers and coamings*1 · All trans. rings*2 · All trans. bulkheads*1*3 · all stiffeners (trans. web frames or longitudinals) on side shell or longitudinal bulkhead
2. Thickness measurement -1. Suspect areas (See Appendix 4-2.) -2. Structural members subject to Close-up Survey (See 1. above.) -3. Systematic thickness measurement (See the figure below) (1)Each exposed main deck plate and selected exposed superstructure deck plate (2)All longitudinal members in three transverse sections, one in the amidship area, at deck plating outside line of cargo hatch openings within the cargo length area (3)Each bottom plate within the cargo length area (4)All wind and water strakes (5)All keel plates full length (6)Bottom plates in way of cofferdams and machinery spaces and aft end of tanks -4. Internals in FPT&APT -5. Plating of sea chests (Shell plating in way of overboard discharges as deemed necessary) -6. Standards for measuring points are to be referred to.
LWL BWL
Cargo Length Area
(Upper Deck Plan)
(Bottom Plan)
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GUIDANCE FOR UNDERGOING CLASS MAINTENANCE SURVEYS
Standards for Measuring Points (Double Skin Bulk Carriers)
-1. Thickness measurement for the structural members subject to close-up survey Standards of measuring points for the structural members subject to close-up survey (such as trans. ring, etc.) are shown in below figures. Taking into account of the ship’s age and structural system of the members, the number of measuring points is to be adjusted as appropriate. -2. Thickness measurement for transverse section, etc. (1) Belt gauging -Platings : Every deck flange and bottom flange should be measured at one point between longitudinals. All the other platings should be measured at one point per strake. -Longitudinals : Every longitudinal should be measured on the web and face plate. (2) Thickness measurement for shell platings, deck platings, etc. Two points are to be measured in each plate of side shell, bottom shell, upper deck, etc. where thickness measurements of all plates or along the length of the plate are required. -3. Thickness measurement for members where substantial corrosion is found Where substantial corrosion is found through the results of thickness measurements, extent of thickness measurement (number of structural members and measuring points) is to be increased in accordance with the direction of the Surveyor and with requirements specified in Appendix 4-3.
Belt Gauging
Trans. Bulkhead
Trans. Ring
Hatch Cover & Coaming
Hatch Coaming
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GUIDANCE FOR UNDERGOING CLASS MAINTENANCE SURVEYS
Part 6
Bulk Carriers built under Part CSR-B of the Rules
This chapter includes the outline of close-up surveys and thickness measurements for Bulk Carriers built under Part CSR-B of the Rules in addition to the requirements mentioned in Part 3 and 4 of this guidance. (1) For Bulk Carriers built under Part CSR-B of the Rules, identified substantial corrosion areas are to be in accordance with either the following (a) or (b): (a) Be protected by coatings applied in accordance with coating manufacturer requirements and examined annually to confirm said coatings are still in good condition; or (b) Have thickness measurements taken annually (2) At Special Surveys for Bulk Carriers built under Part CSR-B of the Rules, when thickness measurements are carried out, interpretations specified in the following Table are also to be considered for the number and location of thickness measurement. The locations of the points to be measured are to be given for the most important of the structure.
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GUIDANCE FOR UNDERGOING CLASS MAINTENANCE SURVEYS
Interpretations of rule requirements for the number and location of thickness measurements for CSR bulk carriers Reference
Item
Interpretation
Selected plates on deck, tank top, bottom, double bottom and wind-and- water area
«Selected» means at least a single point on one out of three plates, to be chosen as representative areas of average corrosion
All deck, tank top and bottom plates and wind-and-water strakes
At least two points on each plate to be taken either at each 1/4 extremity of plate or at representative areas of average corrosion
Transverse section
Single side skin construction: A transverse section includes all longitudinal members (i.e., plating, longitudinals and girders, etc.) at the deck, side, bottom; inner bottom and hopper side plating and bottom plating in top wing tanks. Double side skin construction: A transverse section includes all longitudinal members (i.e., plating, longitudinals and girders, etc.) at the deck, sides, bottom, inner bottom, hopper sides, inner sides and top wing inner sides.
Fig (A)
All cargo hold hatch covers and coamings
Including plates and stiffeners
Fig. (B)
Transverse section of deck plating outside line of cargo hatch openings
Two single points on each deck plate (to be taken either at each 1/4 extremity of the plate or at representative areas of average corrosion) between the ship sides and hatch coamings in the concerned transverse section
All deck plating and underdeck structure inside line of hatch openings between cargo hold hatches
«All deck plating» means at least two points on each plate to be taken either at each 1/4 extremity of the plate or at representative areas of average corrosion. “Under deck structure”: at each short longitudinal girder: three points for web plating (fwd/middle/aft), one point for face plate, one point for web plating and one point for face plating of transverse beams in way. At each end of transverse beams, one point for web plating and one point for face plate
Fig. (F)
Selected side shell frames in cargo holds of single side skin construction
Includes side shell frames, upper and lower end attachments and adjacent shell plating. • 25% of frames: one out of four frames should preferably be chosen throughout the cargo hold length on each side. • 50% of frames: one out of two frames should preferably be chosen throughout the cargo hold length on each side. «Selected frames» means at least 3 frames on each side of cargo holds
Fig. (C)
Transverse frame in double skin tank of double side skin construction
---
Fig. (A)
Transverse bulkheads in cargo holds
Includes bulkhead plating, stiffeners and girders. Also includes internal structures of upper and lower stools, where fitted. Two selected bulkheads: one is to be the bulkhead between the two foremost cargo holds and the second may be chosen in another position
Fig. (D)
One transverse bulkhead in each cargo hold
This means that close-up surveys and related thickness measurements are to be performed on one side of the bulkhead; the side is to be chosen based on the outcome of the overall survey of both sides. In the event of doubt, the Surveyor may also require (possibly partial) close-up surveys on the other side
Fig. (D)
Transverse bulkheads in one topside, hopper, double bottom ballast tank and side ballast tank(double side skin)
Includes bulkhead and stiffening systems. The ballast tank is to be chosen based on the history of ballasting among those prone to have the most severe conditions
Fig. (E)
Transverse webs in ballast tanks
Includes web plating, face plates, stiffeners and associated plating and longitudinals. One of representative tanks of each type (i.e. topside or hopper or side tank) is to be chosen for in the forward part
Fig. (A) Fig. (C)
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GUIDANCE FOR UNDERGOING CLASS MAINTENANCE SURVEYS
Fig. (A) Example of locations subject to thickness measurements in transverse sections (bulk carriers)
Note: Measurements are to be taken for both the port and starboard sides of the selected transverse section.
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GUIDANCE FOR UNDERGOING CLASS MAINTENANCE SURVEYS
Fig. (B) Example of locations subject to thickness measurements on hatch covers and hatch coamings (bulk carriers)
Notes: 1. Three sections at L/4, L/2, 3L/4 of hatch cover length, including: • one measurement of each hatch cover plate and skirt plate • measurements of adjacent beams and stiffeners • one measurement of coaming plates and coaming flanges, for each side 2. Measurements of both ends of hatch cover skirt plates, coaming plates and coaming flanges 3. One measurement (two points for web plates and one point for face plates) of one out of three hatch coaming brackets and bars, on both sides and both ends
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GUIDANCE FOR UNDERGOING CLASS MAINTENANCE SURVEYS
Fig. (C) Example of locations subject to thickness measurements in cargo holds and water ballast tanks (single side skin bulk carriers)
Note: The gauging pattern for web plates is to be a three point pattern for zones A, C and D, and a two point pattern for zone B (see figure). The gauging report is to reflect the average reading. The average reading is to be compared with the allowable thickness. If the web plate has general corrosion then this pattern is to be expanded to a five-point pattern.
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GUIDANCE FOR UNDERGOING CLASS MAINTENANCE SURVEYS
Fig. (D) Example of locations subject to thickness measurements on cargo hold transverse bulkheads (bulk carriers)
Note: Measurements are to be taken in each shaded area as shown in A-A and B-B
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GUIDANCE FOR UNDERGOING CLASS MAINTENANCE SURVEYS
Fig. (E) Example of locations subject to thickness measurements on transverse bulkheads of topside, hopper, double hull and double bottom tanks (bulk carriers)
Note: Measurements are to be taken in each shaded area as shown in A-A and B-B
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GUIDANCE FOR UNDERGOING CLASS MAINTENANCE SURVEYS
Fig. (F) Example of locations subject to thickness measurements on underdeck structures (bulk carriers)
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GUIDANCE FOR UNDERGOING CLASS MAINTENANCE SURVEYS
Part 7
Ore Carriers
This chapter includes the outline of close-up surveys and thickness measurements required in Part B of Rules at each special survey of ore carriers.
Structures and terminology of typical ore carriers
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GUIDANCE FOR UNDERGOING CLASS MAINTENANCE SURVEYS
Special Survey No.1 (Ore Carriers)
(ship’s age ≤ 5 years)
1. Close-up Survey Compartments and tanks All cargo holds
Subject members · Two selected trans. bulkheads*1*2 · Air pipes and sounding pipes in way of tank top · All cargo hatch covers and coamings*1 · One transverse ring*3 · Lower part of one transverse bulkhead*4
One ballast wing tank
*1: Including stiffeners and girders *2: Close-up Surveys of transverse bulkheads are to be carried out at least at four levels as specified as follows: (1) Immediately above the inner bottom and immediately above the line of gussets (if fitted) and shedders for ships without lower stool. (2) Immediately above and below the lower stool shelf plate (for those ships fitted with lower stools), and immediately above the line of the shedder plates. (3) About mid-height of the bulkhead. (4) Immediately below the upper deck plating and immediately adjacent to the upper wing tank, and immediately below the upper stool shelf plate for those ships fitted with upper stools, or immediately below the topside tanks. *3: Cross ties and complete transverse web frame ring including adjacent structural members such as shell plating, longitudinal bulkheads, longitudinal stiffeners, brackets, etc. *4: Transverse bulkhead vertical and horizontal girders and adjacent members such as longitudinal bulkheads, inner bottom plating, hopper plating, bottom girders, brackets, stiffeners, etc. *5: Including deck structures adjacent to deck transverse such as deck plating, longitudinal stiffeners, brackets, etc. 2. Thickness measurement -1. Suspect areas (See Appendix 4-2.) -2. Structural members subject to Close-up Survey (See 1. above.) -3. Standards for measuring points are referred to.
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GUIDANCE FOR UNDERGOING CLASS MAINTENANCE SURVEYS
Special Survey No.2 (Ore Carriers)
(5 years < Ship’s age ≤ 10 years)
1. Close-up Survey Compartments and tanks All cargo holds
One ballast wing tank Other ballast wing tanks Remaining ballast tanks *1 to *5: Refer to Special Survey No.1.
Subject members · All complete trans. bulkheads*1*2 · All area of deck plating and under deck structure inside line hatch opening between cargo hold hatches · Air pipes and sounding pipes in way of tank top · All piping arrangements in cargo holds · All cargo hatch covers and coamings*1 · All transverse rings*3 · Both transverse bulkheads*4 · Each one deck transverse*5 · Lower part of each one transverse bulkhead*4 · Lower part of each one transverse bulkhead*4
2. Thickness measurement -1. Suspect areas (See Appendix 4-2.) -2. Structural members subject to Close-up Survey (See 1. above.) -3. Systematic thickness measurement (See the figure below.) (1)Selected areas of deck plating inside line of openings between cargo hold hatches (2)Two trans. Sections of deck plating, outside line of cargo hatch openings within the cargo length area (3)Wind and water strakes in way of the trans. sections considered under the above (2) (4)Wind and water strakes outside the cargo length area (at least one strake on each side) -4. Standards for measuring points are to be referred to.
LWL BWL
Cargo Length Area
(Upper Deck Plan)
(Bottom Plan)
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GUIDANCE FOR UNDERGOING CLASS MAINTENANCE SURVEYS
Special Survey No.3 (Ore Carriers)
(10 years < Ship’s age ≤ 15 years)
1. Close-up Survey Compartments and tanks All cargo holds
Subject members · All complete trans. bulkheads*1*2 · All area of deck plating and under deck structure inside line hatch opening between cargo hold hatches · Air pipes and sounding pipes in way of tank top · All piping arrangements in cargo holds · All cargo hatch covers and coamings*1 · All transverse rings*3 · All transverse bulkheads*4 · Each one transverse ring*3 (Additional close-up surveys may be carried out for other transverse rings as deemed necessary by the Surveyor)
All ballast tanks All wing void spaces
*1 to *5: Refer to Special Survey No.1.
2. Thickness measurement -1. Suspect areas (See Appendix 4-2.) -2. Structural members subject to Close-up Survey (See 1. above.) -3. Systematic thickness measurement (See the figure below) (1)Each deck plating within cargo length area (2)All longitudinal members in two transverse sections, one in the amidship area, at deck plating outside line of cargo hatch openings within the cargo length area (3)All wind and water strakes within the cargo length area (4)Selected wind and water strakes outside the cargo length area -4. Internals in FPT&APT -5. Standards for measuring points are to be referred to.
LWL BWL
Cargo Length Area
(Upper Deck Plan)
(Bottom Plan)
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GUIDANCE FOR UNDERGOING CLASS MAINTENANCE SURVEYS
Special Survey No.4 and subsequent (Ore Carriers)
(15 years < Ship’s age)
1. Close-up Survey Compartments and tanks All cargo holds
Subject members · All complete trans. bulkheads*1*2 · All area of deck plating and under deck structure inside line hatch opening between cargo hold hatches · Air pipes and sounding pipes in way of tank top · All piping arrangements in cargo holds · All cargo hatch covers and coamings*1 · All transverse rings*3 · All transverse bulkheads*4 · Each one transverse ring*3 (Additional close-up surveys may be carried out for other transverse rings as deemed necessary by the Surveyor)
All ballast tanks All wing void spaces
*1 to *5: Refer to Special Survey No.1.
2. Thickness measurement -1. Suspect areas (See Appendix 4-2.) -2. Structural members subject to Close-up Survey (See 1. above.) -3. Systematic thickness measurement (See the figure below) (1)Each exposed main deck plate and selected exposed superstructure deck plate (2)All longitudinal members in three transverse sections, one in the amidship area, at deck plating outside line of cargo hatch openings within the cargo length area (3)Each bottom plate within the cargo length area (4)All wind and water strakes (5)All keel plates full length (6)Bottom plates in way of cofferdams and machinery spaces and aft end of tanks -4. Internals in FPT&APT -5. Plating of sea chests (Shell plating in way of overboard discharges as deemed necessary) -6. Standards for measuring points are to be referred to.
LWL BWL
Cargo Length Area
(Upper Deck Plan)
(Bottom Plan)
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GUIDANCE FOR UNDERGOING CLASS MAINTENANCE SURVEYS
Standards for Measuring Points (Ore Carriers)
-1. Thickness measurement for the structural members subject to close-up survey Standards of measuring points for the structural members subject to close-up survey (such as trans. ring, etc.) are shown in below figures. Taking into account of the ship’s age and structural system of the members, the number of measuring points is to be adjusted as appropriate. -2. Thickness measurement for transverse section, etc. (1) Belt gauging -Platings : Every deck flange and bottom flange should be measured at one point between longitudinals. All the other platings should be measured at one point per strake. -Longitudinals : Every longitudinal should be measured on the web and face plate. (2) Thickness measurement for shell platings, deck platings, etc. Two points are to be measured in each plate of side shell, bottom shell, upper deck, etc. where thickness measurements of all plates or along the length of the plate are required. -3. Thickness measurement for members where substantial corrosion is found Where substantial corrosion is found through the results of thickness measurements, extent of thickness measurement (number of structural members and measuring points) is to be increased in accordance with the direction of the Surveyor and with requirements specified in Appendix 4-3.
Trans. Bulkhead
Belt Gauging
Hatch Cover & Coaming
Hatch Coaming
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GUIDANCE FOR UNDERGOING CLASS MAINTENANCE SURVEYS
Part 8
Ships Carrying Liquefied Gases in Bulk
This part includes the outline of close-up surveys and thickness measurements required in Part B of Rules at each special survey of ships carrying liquefied gases in bulk.
Structures and terminology of typical Ships Carrying Liquefied Gases in Bulk
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GUIDANCE FOR UNDERGOING CLASS MAINTENANCE SURVEYS
Special Survey No.1 (Ships Carrying Liquefied Gases in Bulk) (ship’s age ≤ 5 years) 1. Close-up Survey
Subject members*6 One Transverse Ring*1 Lower parts of one Transverse Bulkhead*2 *1: Complete transverse web frame ring including adjacent structural members such as shell plates, longitudinal bulkhead, longitudinal stiffeners, brackets, etc. *2: Including vertical and horizontal girders and adjacent structural members *3: Including adjacent longitudinal bulkhead structure *4: One ballast tank is to be selected from ballast tanks consisting of topside, double hull side and hopper side. Even if the aforementioned portions are separated tanks, they are to be considered as one tank. *5: One ballast tank can be selected from ballast tanks including peak tanks *6: For ships having independent tanks of type C, with a midship section similar to that of a general cargo ship, the extent of close-up surveys may be specially considered at the discretion of the Surveyor. Tanks One representative ballast tank*4 One ballast tank*5
2. Thickness measurement -1. Suspect areas (See Appendix 4-2.) -2. Structural members subject to Close-up Survey (See above 1.) -3. Systematic thickness measurement (See the figure below.) (1) One transverse section of deck plating for hull beam of the ship within 0.5L amidships (in way of a ballast tank, if any) -4. For ship having independent tanks of type C, with a midship section similar to that of a general cargo ship, the extent of thickness measurements may be increased to include the tank top plating at the discretion of the Surveyor. -5.Standards for measuring points are referred to.
LWL BWL
0.5L amidship
(Upper Deck Plan) WBT
(Bottom Plan)
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GUIDANCE FOR UNDERGOING CLASS MAINTENANCE SURVEYS
Special Survey No.2 (Ships Carrying Liquefied Gases in Bulk)
(5 years < Ship’s age ≤ 10 years)
1. Close-up Survey
Tanks Subject members*6 One ballast tank which is to be a double hull side tank or a -All Trans. Rings*1 topside tank (If such tanks are not fitted another ballast tank is -Each one Trans. Bulkhead *2,*3 to be selected.*5) Each remaining ballast tank -Each one Trans. Ring*1 -Each one Trans.Bulkhead*2,*3 *1 to *6 : Refer to Special Survey No.1. 2. Thickness measurement -1. Suspect areas (See Appendix 4-2.) -2. Structural members subject to Close-up Survey (See above 1.) -3. Systematic thickness measurement (See the figure below.) (1)Each deck plate within the cargo area (2)All longitudinal members in one transverse section within 0.5L amidship within the cargo area (in way of a ballast tank, if any) When the selected section is a transversely framed section, adjacent frames and their end connections in way of the transverse section are to be included. (3)Wind and water strakes outside cargo area (at least one strake on each side) -4. For ship having independent tanks of type C, with a midship section similar to that of a general cargo ship, the extent of thickness measurements may be increased to include the tank top plating at the discretion of the Surveyor. -5. Standards for measuring points are referred to.
LWL BWL
0.5L amidship Cargo Area
(Upper Deck Plan)
WBT
WBT
(Bottom Plan)
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GUIDANCE FOR UNDERGOING CLASS MAINTENANCE SURVEYS
Special Survey No.3 (Ships Carrying Liquefied Gases in Bulk)
(10 years < Ship’s age ≤ 15 years)
1. Close-up Survey All ballast tanks
Subject members*6 All Transverse Rings*1 All Transverse Bulkheads*2,*3
Tanks
*1 to *6 : Refer to Special Survey No.1.
2. Thickness measurement -1. Suspect areas (See Appendix 4-2.) -2. Structural members subject to Close-up Survey (See above 1.) -3. Systematic thickness measurement (See the figure below.) (1)Each deck plate within the cargo area (2)All longitudinal members in two transverse sections within the cargo area (note) When the selected section is a transversely framed section, adjacent frames and their end connections in way of the transverse section are to be included. (3)Wind and water strakes inside the cargo area (all strakes on each side) (4)Wind and water strakes outside the cargo area (at least one strake on each side) (note) At least one transverse section within 0.5L of the hull girder length (in way of a ballast tank, if any) is to be chosen. -4. Internals in FPT&APT -5. For ship having independent tanks of type C, with a midship section similar to that of a general cargo ship, the extent of thickness measurements may be increased to include the tank top plating at the discretion of the Surveyor. -6. Standards for measuring points are to be referred to.
LWL BWL
0.5L amidship Cargo Area
(Upper Deck Plan)
WBT
WBT
(Bottom Plan)
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GUIDANCE FOR UNDERGOING CLASS MAINTENANCE SURVEYS
Special Survey No.4 and Subsequent (Ships Carrying Liquefied Gases in Bulk)
(15 years < Ship’s age)
1. Close-up Survey Same as Special Survey No.3 2. Thickness measurement -1. Suspect areas (See Appendix 4-2.) -2. Structural members subject to Close-up Survey (See above 1.) -3. Systematic thickness measurement (See the figure below.) (1)Each deck plate within the cargo area (2)Each bottom plate within the cargo area (3)All longitudinal members in three transverse sections within the cargo area (note) When the selected section is a transversely framed section, adjacent frames and their end connections in way of the transverse section are to be included. (4)Duct keel plating and internals within the cargo area (5)All wind and water strakes (6)All exposed main deck plating outside the cargo area (7) Representative exposed superstructure deck plating (8) All keel plates, full length, and an appropriate number of bottom plates in way of cofferdams, machinery space, and aft end of tanks outside of the cargo area (note) At least one transverse section within 0.5L of the hull girder length (in way of a ballast tank, if any), is to be chosen. -4 Internals in FPT&APT -5 Plating of sea chests (Shell plating in way of overboard discharges as deemed necessary) -6. For ship having independent tanks of type C, with a midship section similar to that of a general cargo ship, the extent of thickness measurements may be increased to include the tank top plating at the discretion of the Surveyor. -7. Standards for measuring points are to be referred to.
LWL BWL
0.5L amidship Cargo Area
(Upper Deck Plan)
WBT
WBT
(Bottom Plan)
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GUIDANCE FOR UNDERGOING CLASS MAINTENANCE SURVEYS
Standards for Measuring Points (Ships Carrying Liquefied Gases in Bulk)
-1. Thickness measurement for the structural members subject to close-up survey Standards of measuring points for the structural members subject to close-up survey such as trans. ring, etc. are shown in the figures below. Taking into account of the ship’s age and structural system of the members, the number of measuring points is to be adjusted as appropriate. -2. Thickness measurement for transverse section, etc. (1) Belt gauging -Platings: Every deck flange and bottom flange should be measured at one point between longitudinals. All the other platings should be measured at one point per strake. -Longitudinals: Every longitudinal should be measured on the web and face plate. (2) Thickness measurement for shell platings, deck platings, etc. Two points are to be measured in each plate of side shell, bottom shell, upper deck, etc. where thickness measurements of all plates or along the length of the plate are required. -3. Substantial corrosion Where substantial corrosion is found through the results of thickness measurements, extent of thickness measurement (number of structural members and measuring pints) is to be increased in accordance with the direction of the Surveyor and with requirements specified in Appendix 4-3.
Bulkhead Section
Belt Gauging
Trans. Web Section
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GUIDANCE FOR UNDERGOING CLASS MAINTENANCE SURVEYS
Part 9 General Dry Cargo Ships This chapter includes the outline of close-up surveys and thickness measurements required in Part B of Rules at each special survey of General Dry Cargo Ships*1 (including ships carrying timber cargoes*2). *1: "General Dry Cargo Ships" are ships constructed or converted to carry solid cargoes other than: bulk carrier container carrier dedicated forest product carriers (except for ships carrying timber cargoes) ro-ro cargo ships car carriers refrigerated cargo ships dedicated wood chip carrier and dedicated cement carriers Ships of double side-skin construction, with double side-skin extending for entire length of the cargo area, and for the entire height of the cargo hold to the upper deck *2: "Ships carrying timber cargoes" are cargo ships which belongs to general dry cargo ships specified in the above and which marked timber load lines in accordance with the requirement in Rule or primarily carrying log cargoes.
Structures and terminology of typical General Dry Cargo Ships
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GUIDANCE FOR UNDERGOING CLASS MAINTENANCE SURVEYS
Special Survey No.1 (General Dry Cargo Ships)
(ship’s age ≤ 5 years)
1. Close-up Survey Compartments and tanks Forward and after cargo holds
Subject members · Selected hold frames*1*5 · Lower part of remaining hold frames*1 Remaining cargo holds · Lower part of remaining hold frames*1 All cargo holds · One selected transverse bulkhead*2*3 · Lower part of remaining transverse bulkhead*2 · All cargo hold hatch covers and coamings*2 · Air pipes and sounding pipes in cargo holds in way of tank top *1: Including end attachments and adjacent shell platings *2: Including stiffeners *3: Close-up Surveys of transverse bulkheads are to be carried out at least at four levels as specified as follows: (1) Immediately above the inner bottom and immediately above the tween deck, as applicable. (2) Mid-height of the bulkheads for holds without tween decks. (3) Immediately below the upper deck plating and tween deck plating. *4: Including plating and longitudinal, similar primary members in the case of no trans. rings are arranged *5: including selected hold frames in associated tween deck spaces, if any 2. Thickness measurement -1. Suspect areas (See Appendix 4-2.) -2. In cargo holds where high-corrosive cargoes to steel such as logs, salt, coal, sulfide ore, etc. have been loaded (1)Hold frames : Lower parts of webs and lower end brackets of each three hold frames at a fore/middle/aft part of both sides in each cargo hold (2)Trans. bulkhead: Lowest strake of each trans. bulkhead and end of end of brackets (in associated tween deck spaces, if any) -3. Both ends and middle part including face plate of one transverse ring or corresponding main structural members in one each tank selected arbitrary from the top side tanks, bilge hopper tanks and deep tanks used as the ballast tanks. -4. Standards for measuring points are referred to.
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GUIDANCE FOR UNDERGOING CLASS MAINTENANCE SURVEYS
Special Survey No.2 (General Dry Cargo Ships)
(5 years < Ship’s age ≤ 10 years)
1. Close-up Survey Compartments and tanks All cargo holds
Subject members · Selected hold frames*1*5 · Lower part of remaining hold frames*1 · Selected transverse bulkheads in each cargo hold*2*3 · Lower part of remaining transverse bulkheads*2 · All cargo hatch covers and coamings*2 · Selected deck platings inside line hatch opening between cargo hold hatches · Selected inner bottom platings · Air pipes and sounding pipes in cargo holds in way of tank top One water ballast side tank · Forward and after transverse bulkheads*2 Each two representative water ballast tanks of · Each one trans. ring*4 each type (i.e. top side, hopper side, side tank or double bottom tank)
*1 to *5 : Refer to Special Survey No.1.
2. Thickness measurement -1. Suspect areas (See Appendix 4-2.) -2. In cargo holds where high-corrosive cargoes to steel such as logs, salt, coal, sulfide ore, etc. have been loaded (1)Hold frames : Lower and upper parts of webs and lower end brackets of at least 1/3 of total number of hold frames at a fore/middle/aft part of both sides in each cargo hold (2)Trans. bulkhead: Lowest strake of each trans. bulkhead and lower end brackets (in associated tween deck spaces, if any) -3. In the other cargo holds : The same extent as 2.-2. of previous special survey -4. In each one representative water ballast tanks of each type (i.e. top side, hopper side and deep tank) used as the ballast tanks : (1) Both ends and middle part including face plate of 1/2 of total number of transverse rings or corresponding main structural members (2) Uppermost and lowest strakes of each transverse bulkhead -5. In the other ballast tanks : Both ends and middle part including face plate of one transverse ring or corresponding main structural members -6. At hatch coamings : Both ends and middle part of each hatch side and end coaming (platings and stiffeners) -7. At hatch covers : All cargo hold hatch covers (platings and stiffeners) -8. Systematic thickness measurement within 0.5L amidships (See the figure below) (1) Each plate in one section of the strength deck plating for the full beam of the ship (2) Each strength deck plate in way of water ballast tanks, if any (3) Each strength deck plate on or underneath which log cargoes or other cargoes being prone to accelerate corrosion have been carried -9. Standards for measuring points are referred to.
0.5L amidship (Upper Deck Plan)
(Bottom Plan)
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GUIDANCE FOR UNDERGOING CLASS MAINTENANCE SURVEYS
Special Survey No.3 (General Dry Cargo Ships)
(10 years < Ship’s age ≤ 15 years)
1. Close-up Survey Compartments and tanks Forward lower cargo hold The other cargo holds
Subject members · All hold frames*1 · 1/4 of total number of hold frames*1*5 · Lower part of remaining hold frames*1*5 All cargo holds · All complete trans. Bulkheads*2*3 · All area of deck platings inside line hatch opening between cargo hold hatches · All inner bottom platings · All cargo hatch covers and coamings*2 · Air pipes and sounding pipes in way of tank top All water ballast tanks · All trans. bulkheads*2 Each water ballast tanks (i.e. top side, hopper side, · All transverse rings*3 side tank or double bottom tank)
*1 to *5 : Refer to Special Survey No.1.
2. Thickness measurement -1. Suspect areas (See Appendix 4-2.) -2. Structural members subject to Close-up Survey (See 1. above.) For the following members, at least the points indicated in (1) to (3) are to be measured. (1)Hold frames : Lower and upper parts of webs and lower end brackets of at least 1/3 of total number of hold frames at a fore/middle/aft part of both sides in each cargo hold (2)Hatch coaming : Both ends and middle part of each hatch side and end coaming (plating and stiffeners) (3)Hatch cover : All cargo hold hatch covers (selected plating and stiffeners) -3. Systematic thickness measurement (See the figure below) (1) Each deck plating outside line of cargo hatch openings within cargo length area (2) Each deck plating inside line of cargo hatch opening within 0.5L amidship and cargo length area (3) All longitudinal members in two transverse sections, one in the amidship area, within 0.5L amidship and cargo length area When the selected section is a transversely framed section, adjacent frames and their end connections in way of the transverse section are to be included. (4) All wind and water strakes within cargo length area (5) Selected wind and water strakes outside cargo length area -4. Internals in FPT&APT -5. Standards for measuring points are to be referred to.
LW BWL 0.5L amidship
*1
(Upper Deck Plan)
(Bottom Plan) - 107 -
GUIDANCE FOR UNDERGOING CLASS MAINTENANCE SURVEYS
Special Survey No.4 and subsequent (General Dry Cargo Ships)
(15 years < Ship’s age)
1. Close-up Survey Compartments and tanks All cargo holds
Subject members · All hold frames*1*5 · All complete trans. bulkheads*2*3 · All area of deck plating inside line hatch opening between cargo hold hatches · All inner bottom platings · All cargo hatch covers and coamings*2 · Air pipes and sounding pipes in way of tank top All water ballast tanks · All trans. Bulkheads*2 Each water ballast tanks (i.e. top side, hopper side, · All trans. Rings*3 side tank or double bottom tanks)
*1 to *5 : Refer to Special Survey No.1.
2. Thickness measurement -1. Suspect areas (See Appendix 4-2.) -2. Structural members subject to Close-up Survey (See 1. above.) For the following members, at least the points indicated in (1) to (4) are to be measured. (1)Hold frames : Lower and upper parts of webs and lower end brackets of all of hold frames in each cargo hold (2)Trans. bulkhead: All complete trans. bulkheads in all cargo holds (3)Hatch coaming : Both ends and middle part of each hatch side and end coaming (plating and stiffeners) (4)Hatch cover : All cargo hold hatch covers (selected plating and stiffeners) -3. Systematic thickness measurement (See the figure below) (1)All exposed main deck plate full length (2) All longitudinal members in three transverse sections, one in the amidship area, at deck plating outside line of cargo hatch openings within the cargo length area When the selected section is a transversely framed section, adjacent frames and their end connections in way of the transverse section are to be included. (3) Each bottom plate in within the cargo length area (4) All wind and water strakes (5) All keel plates full length (6) Bottom plates in way of cofferdams and machinery spaces and aft end of tanks (7) Representative exposed superstructure deck plate -4. Internals in FPT&APT, Duct keel or pipe tunnel plating and internals within cargo length area -5. Plating of sea chests (Shell plating in way of overboard discharges as deemed necessary) -6. Standards for measuring points are to be referred to.
LW BWL 0.5L amidship
(Upper Deck Plan)
(Bottom Plan) - 108 -
GUIDANCE FOR UNDERGOING CLASS MAINTENANCE SURVEYS
Standards for Measuring Points (General Dry Cargo Ships)
-1. Thickness measurement for the structural members subject to close-up survey Standards of measuring points for the structural members subject to close-up survey (such as trans. ring, etc.) are shown in below figures. Taking into account of the ship’s age and structural system of the members, the number of measuring points is to be adjusted as appropriate. Standards of measuring points for structural members in wing ballast tanks and wing void spaces should be refereed to requirements of oil tankers. -2. Thickness measurement for transverse section, etc. (1) Belt gauging -Platings : Every deck flange and bottom flange should be measured at one point between longitudinals. All the other platings should be measured at one point per strake. -Longitudinals : Every longitudinal should be measured on the web and face plate. (2) Thickness measurement for shell platings, deck platings, etc. Two points are to be measured in each plate of side shell, bottom shell, upper deck, etc. where thickness measurements of all plates or along the length of the plate are required. (3) Thickness measurement for hold frames Hold frames and their end brackets are to be measured at position within 30mm from the weld of hold frames to side shell, deck and inner bottom plate. -3. Thickness measurement for members where substantial corrosion is found Where substantial corrosion is found through the results of thickness measurements, extent of thickness measurement (number of structural members and measuring points) is to be increased in accordance with the direction of the Surveyor and with requirements specified in Appendix 4-3.
Trans. Bulkhead
Typical Section
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GUIDANCE FOR UNDERGOING CLASS MAINTENANCE SURVEYS
Part 10 Other Cargo Ships (Other than Oil / Chemical Tankers, Bulk Carriers and General Dry Cargo Ships) This chapter includes the outline of close-up surveys and thickness measurements required in Part B of Rules at each special survey of cargo ships (including ships carrying liquefied gases in bulk) other than oil tankers, chemical tankers, bulk carriers and general dry cargo ships. Close-up Survey Close-up surveys of following areas are to be carried out at each special survey. (The requirements of close-up survey for cargo ships do not depend on ship’s age.) (1) Lower part of hold frames, tank side brackets and lower part of bulkheads in cargo holds (2) Air pipes and sounding pipes in cargo holds in way of tank top (3) All hatch cover platings and hatch coaming platings Thickness Measurement The guidance for thickness measurements required at each special survey is available in the following pages.
Special Survey No.1 (Other Cargo Ships) (ship’s age ≤ 5 years)
-1. Suspect areas (Appendix 4-2.)
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GUIDANCE FOR UNDERGOING CLASS MAINTENANCE SURVEYS
Special Survey No.2 (Other Cargo Ships)
( 5 years < Ship’s age ≤ 10 years) -1. Suspect areas (Appendix 4-2.) -2. Systematic thickness measurement (1)Each plate in one section of strength deck for the full beam of ship within 0.5L amidship
0.5L amidship
(Upper Deck Plan)
(Bottom Plan)
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GUIDANCE FOR UNDERGOING CLASS MAINTENANCE SURVEYS
Special Survey No.3 (Other Cargo Ships)
(10 years < Ship’s age ≤ 15 years)
-1. Suspect areas (Appendix 4-2.) -2. Other members (1) Both ends and middle part of each hatch side and end coaming (2) All cargo hold hatch covers (plating and stiffeners) -3. Systematic thickness measurement (1) Each longitudinal members in two transverse section within 0.5L amidship When the selected section is a transversely framed section, adjacent frames and their end connections in way of the transverse section are to be included. -4 Internals in FPT&APT
LWL
BWL 0.5 L amidship
(Upper Deck Plan)
(Bottom Plan)
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GUIDANCE FOR UNDERGOING CLASS MAINTENANCE SURVEYS
Special Survey No.4 and Subsequent (Other Cargo Ships)
(15 years < Ship’s age)
-1. Suspect areas (Appendix 4-2.) -2. Other members (1) Both ends and middle part of each hatch side and end coaming (2) All cargo hold hatch covers (plating and stiffeners) -3. Systematic thickness measurement (1) All exposed main deck plate full length (2) Each longitudinal members in three transverse sections within 0.5L amidship and cargo length area When the selected section is a transversely framed section, adjacent frames and their end connections in way of the transverse section are to be included. (3) Representative exposed superstructure deck plating (poop, bridge and forecastle deck) (4) All wind and water strakes, port and starboard, full length (5) All keel plate full length together with additional bottom plates in way of cofferdams, machinery spaces and aft end of tanks -4. Internals in FPT&APT, exposed main deck and bottom outside of cargo area, keel full length, superstructure deck -5. Plating of sea chests (Shell plating in way of overboard discharges as deemed necessary)
LWL BWL
0.5 L amidship
(Upper Deck Plan)
(Bottom Plan)
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GUIDANCE FOR UNDERGOING CLASS MAINTENANCE SURVEYS
Standards for Measuring Points (Other Cargo Ships)
-1. Thickness measurement for the structural members subject to close-up survey Standards of measuring points for the structural members for cargo hold are shown in below figures. Taking into account of the ship’s age and structural system of the members, the number of measuring points is to be adjusted as appropriate. Standards of measuring points for structural members in wing ballast tanks and wing void spaces should be refereed to requirements of oil tankers. -2. Thickness measurement for transverse section, etc. (1) Belt gauging -Platings : Every deck flange and bottom flange should be measured at one point between longitudinals. All the other platings should be measured at one point per strake. -Longitudinals : Every longitudinal should be measured on the web and face plate. (2) Thickness measurement for shell platings, deck platings, etc. Two points are to be measured in each plate of side shell, bottom shell, upper deck, etc. where thickness measurements of all plates or along the length of the plate are required. -3. Thickness measurement for members where substantial corrosion is found Where substantial corrosion is found through the results of thickness measurements, extent of thickness measurement (number of structural members and measuring points) is to be increased in accordance with the direction of the Surveyor and with requirements specified in Appendix 4-3.
Trans. Bulkhead
Typical Section
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GUIDANCE FOR UNDERGOING CLASS MAINTENANCE SURVEYS
Appendix 4-2 Suspect Area Where suspect areas are found through internal examination and close-up surveys at special survey, detailed thickness measurement is to be carried out under the direction of the Surveyor. At annual survey, the thickness measurement is also to be applied to the suspect areas (other than cargo tanks) identified at the previous special or intermediate survey. Following structural members are liable to have substantial corrosion and careful inspections of these parts are requested at surveys. 1 Deck and superstructure
- Upper deck Forward part of upper deck; Cross deck plates, especially where bilge water is liable to remain; Hatches and associated decks; deck plates underneath steam pipes - Forecastle, poop and deck house End bulkheads (wall) of superstructures; Lower part of deck house boundaries, especially in way of pipe penetration and drain plugs; top plates in way of bilge courses and deck scuppers; Areas under the deck machinery (winches/windlasses) and fairleaders/bollards - Deck plates in superstructure (especially tank top of deep tanks) - Hatch coamings and stays Lowest parts; Areas around steam pipes; Coamings and stays in cross deck - Bulwarks and stays Lower parts; Areas in way of expansion joints/cargo ports/stanchions - Hatch covers (especially pontoon type) 2 Shell plate
- Side shell plates between ballast water line and load water line - Forward bottom/side shell plates (especially along welding joints) 3 Internal structural members
- Hold frames at connection to tank side brackets and along welds to side shell - Lowest part of transverse bulkheads (above inner bottom or lower deck) - Boundaries in chain locker - Structural members under sea water pumps, and sea chests in machinery space and cargo pump room 4 Structural members in tanks
- Structural members in deep tanks whose tank top is upper deck - Longitudinal bulkhead and their associated members in wing tanks/spaces of oil tankers and ore carriers - Structural members in ballast tanks adjacent to fuel oil tanks - Areas in way of slot openings and lightening holes in floors, etc. - Bottom platings around and under bell mouths and sounding pipes - Horizontal members in cargo oil tanks (Bottom plates, Faces of bottom girders, Horizontal girders, etc.)
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GUIDANCE FOR UNDERGOING CLASS MAINTENANCE SURVEYS
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GUIDANCE FOR UNDERGOING CLASS MAINTENANCE SURVEYS
Appendix 4-3 Additional Thickness Measurement 1. Substantial corrosion Substantial corrosion is an extent of corrosion such that assessment of corrosion pattern indicates a wastage in excess of 75% of allowable margins, but within acceptable limits. When substantial corrosion is found in the results of thickness measurements, the extent and points of the thickness measurement are to be increased to the satisfaction of the Surveyor. Additional thickness measurements are required in accordance with the following 2. to 4. 2. Additional thickness measurement for oil tankers and chemical carriers In the case of oil tankers or chemical carriers, additional thickness measurement is to be carried out for all structural members listed in the table among in -1. through -4., of which the title corresponds to substantially corroded members. -1. Bottom Structure Structural member 1. Inner bottom, bottom and hopper structure plating
Extent of Measurement a) Minimum of 3 bays across tank, including aft bay. Measurements around and under all bell mouths. b) Suspect plate and adjacent plates, if any 2. Inner bottom, bottom and -Minimum of 3 longitudinals hopper structure in each bay where plating longitudinals measured. 3. Bottom girders and brackets -At fore and aft floors or (only for oil tankers) transverse bulkhead bracket toes, and in centre of tanks.
4. Bottom transverse webs / floors 5. Panel stiffening (if any) 6. Hopper structure web frame rings (except for single hull oil tankers)
-3 webs / floors in bays where bottom plating measured, with measurements at both ends and middle. -Where fitted. -3 web frame rings in bays where bottom plating measured.
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Pattern of Measurement a) 5 point pattern for each panel between longitudinals and floors / webs b) 5 point pattern for each panel between longitudinals over 1 m length -3 measurements in line across flange and 3 measurements on vertical web. -Vertical line of single measurements on girder plating with one measurement between each panel stiffener, or a minimum of three measurements. -Two measurements across face flat, if any. -5 point pattern on girder / bulkhead brackets, if any. -5 point pattern over 2 m 2 area. -Single measurements on face flat, if any. -Single measurement -5 point pattern over 1 m 2 of plating. -Single measurements on flange.
GUIDANCE FOR UNDERGOING CLASS MAINTENANCE SURVEYS
Structural member 7. Hopper structure transverse watertight bulkheads or swash bulkheads (except for single hull oil tankers)
-2. Deck Structure Structural member 1. Deck plating 2. Deck longitudinals
3. Deck girders and brackets
Extent of Measurement a) lower 1/3 of bulkhead b) upper 2/3 of bulkhead c) stiffeners (minimum of three)
Extent of Measurement -Two transverse bands across tank -Minimum of 3 longitudinals in each of two bays (only for single hull oil tankers) -Every third longitudinal in each of two bands with a minimum of one longitudinal (except for single hull oil tankers) -At fore and aft transverse bulkhead, bracket toes and in centre of tanks
Pattern of Measurement a) 5 point pattern over 1 m 2 of plating b) 5 point pattern over 2 m 2 of plating c) For web, 5 point pattern over span (two measurements across web at each end and one at centre of span). For flange, single measurements at each end and centre of span. Pattern of Measurement -Minimum of three measurements per plate per band -3 measurements in line vertically on webs, and 2 measurements on flange (if fitted)
4. Deck transverse webs
-Minimum of two webs with measurements at both ends and middle of span
5. Vertical webs and transverse bulkheads in wing ballast tank (within 2 m from deck) (only for in case double hull) 6. Panel stiffening
-Minimum of two webs, and both transverse bulkheads
- Vertical line of single measurements on web plating with one measurement between each panel stiffener, or a minimum of three measurements. -Two measurements across flange. 5 point pattern on girder / bulkhead brackets -5 point pattern over about 1 m2 (for single hull oil tankers, 2 m2) areas. -Single measurement on flange. -5 point pattern over 1 m2 areas.
-Where applicable
Single measurement
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GUIDANCE FOR UNDERGOING CLASS MAINTENANCE SURVEYS
-3. Side Shell and Longitudinal Bulkhead Structural member Extent of Measurement Pattern of Measurement 1. Side shell and longitudinal bulkhead plating: · Deckhead and bottom -Plating between each pair of -Single measurement strakes, and strakes in way longitudinals in a minimum of horizontal stringers of 3 bays · All other strakes -Plating between every 3rd pair -Single measurement of longitudinals in same 3 bays 2. Side shell and longitudinal bulkhead longitudinal on : · Deckhead and bottom -Each longitudinal in same 3 -3 measurements across web strakes bays and 1 measurement of flange · All others strakes -Every third longitudinal in -3 measurements across web same 3 bays and 1 measurement on flange 3. Bracket fitted to -Minimum of three at top, -5 point pattern over area of longitudinals middle and bottom of tank in bracket same 3 bays 4. Vertical webs and transverse bulkheads (excluding deckhead area) (only for wing ballast tanks of double hull oil tankers and chemical carriers): · strakes in way of horizontal -Minimum of 2 webs and both -5 point pattern over girders transverse bulkheads approximately 2 m2 area · All other strakes -Minimum of 2 webs and both -2 measurements between each transverse bulkheads pair of vertical stiffeners 5. Horizontal girders (only for -Plating on each girder in a -2 measurements between each chemical carriers and wing Minimum of 3 bays pair of horizontal girder ballast tanks of double hull stiffeners oil tankers) 6. Horizontal girders -Where applicable -Single measurement stiffeners (only for chemical carriers and wing ballast tanks of double hull oil tankers) 7. Web frames / transverses -3 webs with minimum of three -5 point pattern over about 2 m2 and cross ties (except for locations on each web, area, plus single measurement wing ballast tanks of including in way of cross tie on flanges of web frame / double hull oil tankers and connections transverses and cross tie chemical carriers) 8. Lower end brackets -Minimum of three brackets -5 point pattern over opposite transverses (only approximately 2 m2 area, plus for cargo tanks of double single measurement on hull oil tankers) bracket flanges
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GUIDANCE FOR UNDERGOING CLASS MAINTENANCE SURVEYS
-4. Transverse Bulkheads and Swash Bulkheads except for Wing Ballast Tanks of Double Hull Oil Tankers Structural member
Extent of Measurement
Pattern of Measurement
1. Upper and lower stool, where fitted
-Transverse band within 25mm of welded connection to inner bottom / deck plating -Transverse band within 25mm of welded connection to shelf plate -Plating between pair of stiffeners at three locations: approximately 1/4, 1/2 and 3/4 width of tank -Plating between pair of stiffeners at middle location -Plating for each change of scantling at centre of panel and at flange of fabricated connection -Minimum of three typical stiffeners
-5 point pattern over 1 m length
2. Deckhead and bottom strakes, and strakes in way of horizontal stringers 3. All other strakes 4. Strakes in corrugated bulkheads 5. Stiffeners
6. Brackets 7. Deep webs and girders
8. Horizontal Stringers
-5 point pattern between stiffeners over 1 m length -Single measurement -5 point pattern over about 1 m2 of plating
-For web, 5 point pattern over span between bracket connections (2 measurements across web at each bracket connection, and one at centre of span). -For flange, single measurement at each bracket toe and at centre of span. -Minimum of three at top, -5 point pattern over area of middle and bottom of tank bracket -Measurements at toe of racket -For web, 5 point pattern over and centre of span about 1 m2. -3 measurements across face flat. -All horizontal stringers with -5 point pattern over 1 m2 area, measurements at both ends plus single measurements near and middle bracket toes and on face flats
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GUIDANCE FOR UNDERGOING CLASS MAINTENANCE SURVEYS
3. Additional thickness measurement for bulk carriers (including ore carriers) In the case of bulk carriers (including ore carriers), additional thickness measurement is to be carried out for all structural members listed in the table among -1. through -5., of which the title corresponds to substantially corroded members. -1. Shell Structures for Cargo Holds of Single Side Skin, or Structures in Double Side Skin Spaces including Wing Void Spaces in Ore Carriers Structural Member Extent of Measurement Pattern of Measurement For cargo holds of single side skin 1. Bottom and side -Suspect plate and 4 adjacent plates 5 points for each panel between shell plating - For tanks and cargo holds, See longitudinals other tables for particulars on gauging 2. Bottom/side shell -Minimum of 3 longitudinals in way Face : 3 points longitudinals of suspect area Web : 3 points in line across web For cargo hold of double side skin 1.Side Shell and inner plating -Upper strake and -Plating between each pair of -Single measurement strakes in way of transverse frames / longitudinals in horizontal girders a minimum of three bays (along the tank) -Plating between every third pair of -Single measurement -All other strakes longitudinals in same three bays 2.Side shell and inner side transverse frames / longitudinals on : -Each transverse frame / -Three measurements across web -Upper strake longitudinal in same three bays and 1 measurement on flange -Every third transverse frame / -Three measurements across web -All other strake longitudinal in same three bays and 1 measurement on flange 3.Transverse frames / -Minimum of three at top, middle -Five-point pattern over area of longitudinals and bottom of tank in same three bracket -Brackets bays 4.Verical web and transverse bulkheads: -strakes in way of -Minimum of two webs and both -Five-point pattern over approx. two horizontal girders transverse bulkheads square metre area -other strakes -Minimum of two webs and both -Two measurements between each transverse bulkheads pair of vertical stiffeners 5.Horizontal girders -Plating on each girder in a -Two measurements between each minimum of three bays pair of longitudinal girder stiffeners 6.Panel stiffening Where applicable -Single measurements
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GUIDANCE FOR UNDERGOING CLASS MAINTENANCE SURVEYS
-2. Transverse Bulkheads in Cargo Holds Structural Member Extent of Measurement 1. Lower stool -Transverse band within 25mm of welded connection to inner bottom -Transverse band within 25mm of welded connection to shelf plate 2. Transverse bulkhead -Transverse band at approximately mid height -Transverse band at part of bulkhead adjacent to upper deck or below upper stool shelf plate (for those ships fitted with an upper stool) -3. Deck Structure Including Cross Deck, Main Deck, Cargo and Topside Tanks Structural Member Extent of Measurement 1. Cross deck strip -Suspect cross deck strip plating plating 2. Underdeck stiffeners -Transverse members -Longitudinal members 3. Hatch covers 4. Hatch coamings 5. Topside water ballast tanks
6. Main Deck Plating 7. Main Deck Longitudinals 8. Web Frames / Transverse
Pattern of Measurement -5 points over 1 m length between stiffeners -5 points over 1 m2 of plating
Hatchways, Hatch Covers, Coamings
Pattern of Measurement 5 points pattern over 1 m length between underdeck stiffeners -5 points pattern at each end and mid span -5 point pattern on both web and flange Side and end skirt, each 3 locations -5 points pattern at each location -3 longitudinal bands, outboard -5 points measurement at each band strakes (2) and centerline strake (1) -Lower 1/3 and upper 2/3 of each 5 points at each band i.e. end or side and end coaming side coaming -Watertight transverse bulkheads i. lower 1/3 of bulkhead i. 5 points over 1 m2 of plating ii. upper 2/3 of bulkhead ii. 5 points over 1 m2 of plating iii. stiffeners iii. 5 points over 1 m length -2 respective swash trans. bulkhead i. lower 1/3 of bulkhead i. 5 points over 1 m2 of plating ii. upper 2/3 of bulkhead ii. 5 points over 1 m2 of plating iii. stiffeners iii. 5 points over 1 m length -3 respective bays of sloping plating i. lower 1/3 of tank i. 5 points over 1 m2 of plating ii. upper 2/3 of tank ii. 5 points over 1 m2 of plating -4 Longitudinals, suspect and 5 point pattern both web and flange adjacent over 1 meter length Suspect plates and 4 adjacent plates Minimum of 3 longitudinals where plating measured Suspect plates
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5 points over 1 m2 of plating 5 points on both web and flange over 1 m length 5 points over 1 m2
GUIDANCE FOR UNDERGOING CLASS MAINTENANCE SURVEYS
-4. Bottom, Inner Bottom and Hopper Structure Structural Member Extent of Measurement Pattern of Measurement For cargo holds single side skin 1.Inner / Double Suspect plate plus all adjacent plate 5poimts over 1m length for each bottom plating panel between logitudinals 2.Inner / Double 3 longitudinals where plates Face : 3 points bottom longitudinals measured Web : 3 points in line across web 3.Longitudinal Girders Suspect plates 5 points over 1 m2 or Transverse Floors 4.Watertight Bulkhead -lower 1/3 of tank -5 points over 1 m2 of plating (Watertight floor) -upper 2/3 of tank -5 points in alternate plates over 1 m2 of plating 5. Web Frames Suspect plates -5 points over 1 m2 of plating 6 Bottom/side shell longitudinals 1.Bottom, inner bottom and hopper structure plating 2.Bottom, inner bottom and hopper structure longitudinals 3.Bottom girders, including the watertight ones 4.Bottom floors, including the watertight ones 5.Hopper structure web frame ring 6.Hopper structure transverse watertight bulkhead or swash bulkhead
7.Panel stiffing
Minimum of 3 longitudinals in way -3 measurements in line across web of suspect areas -3 measurements on flange For cargo hold of double side skin -Minimum of three bays across -Five-point pattern for each panel double tank, including aft bay between longitudinals and floors (Measurements around and under all suction bell mouths) -Minimum of three longitudinals in -Three measurements in line across each bay where bottom plating flange and three measurements on measured the vertical web -At fore and aft watertight floors and -Vertical line of single in centre of tanks measurements on girder plating with one measurement between each panel stiffener, or a minimum of three measurements -Three floors in the bays where -Five-point pattern over two square bottom plating measured, with metre area measurements at both ends and middle -Three floors in bays where bottom -Five-point pattern over one square plating measured metre of plating -Single measurements on flange -Lower 1/3 of bulkhead -Five-point pattern over one square metre of plating -upper 2/3 of bulkhead -Five-point pattern over two square metre of plating -stiffeners (minimum of three) -For web, five-point pattern over span (two measurements across web at each end and one at centre of span). -For flange, single measurements at each end and centre of span -Where applicable -Single measurements
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GUIDANCE FOR UNDERGOING CLASS MAINTENANCE SURVEYS
-5. Cargo Holds of Single Side Skin Structural Member Extent of Measurement 1. Side Shell Frames Suspect frame and each adjacent
Pattern of Measurement -At each end and mid span Face : 5 points Web : 5 points -5 points within 25mm of welded attachment to both shell and lower stool plate
4. Additional thickness measurement for general dry cargo ships and other cargo ships (ships except those specially specified in the above 2. & 3.) Structural Member 1. Plating
Extent of Measurement Suspect area and adjacent plates
2. Girders
Suspect area
3. Stiffeners
Suspect area
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Pattern of Measurement 5 point pattern over 1 square metre 5 point pattern over 1 square metre 3 measurements in line across web 3 measurements on flange
GUIDANCE FOR UNDERGOING CLASS MAINTENANCE SURVEYS
Appendix 4-4 Close-up Survey and Thickness Measurement at Intermediate Survey and Annual Survey This appendix includes the outline of close-up surveys and thickness measurements for hull structural members required at Intermediate Surveys and Annual Surveys. ・Extents of thickness measurements and close-up survey at Intermediate Survey for following ships (① and ②) are to be equivalent to those required at last Special Survey[Appendix 4-1]. ① Intermediate Survey of Bulk Carriers / Oil Tanker / Chemical Tanker exceeding 10 years old ② Intermediate Survey of General Dry Cargo Ships of not less than 500 gross tonnage, exceeding 15 years old ・Suspects areas [Appendix 4-2] identified at previous Surveys are to be surveyed by general and internal inspection. (At Annual Survey, the survey for the Suspect areas in cargo tanks of oil tankers, chemical tankers and ships carrying liquefied gases in bulk is not required.) In this case, thickness measurements are also to be taken. ・Where substantial corrosion is found as a result of thickness measurements, additional thickness measurements [Appendix 4-3]are to be carried out. ・Substantial corrosion areas identified at the previous survey (excluding cargo tanks of oil tankers other than ships built under Part CSR-T of the Rules, ships carrying dangerous chemicals in bulk and ships carrying liquefied gases in bulk) are to be overall, close-up surveyed and thickness measurements. For bulk carriers build under Part CSR-B of the Rules, thickness measurements may be dispensed with at Surveyor’s discretion in cases where a protective coating has been applied in accordance with casting manufacturer’s requirements and is maintained in good condition. -1. Oil Tankers and Chemical Tankers Close-up Survey Surveys Compartments and Tanks Intermediate Survey － － Annual Survey Thickness measurement Surveys Subject Members Intermediate Structural members in Survey water ballast tanks (ship’s age > 5 years)
Annual Survey
Structural members in water ballast tanks (ship’s age > 5 years)
Subject Members － －
Requirements -Where considered necessary by the Surveyor as a result of internal examination, the thickness measurement is to be carried out at the discretion of the Surveyor, where poor coating condition, corrosion or other defects are found in a ballast tank or where a protective coating has not been applied from the time of construction. -When extensive corrosion is found as a results of internal examination, thickness measurements are to be carried out to the satisfaction of the Surveyor.
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-2. Bulk Carriers (Except Ore Carriers) Close-up Survey Surveys Compartments and Tanks Subject Members Intermediate Hatch covers and coamings -All hatch cover plates and coamings*2 Survey Structural members in cargo holds (Bulk carriers other than -Minimum 25% hold frames*1*3 and transverse bulkheads in double skin bulk carriers the forward cargo hold and one other selected cargo hold - A close-up survey is to be carried out to establish the [5 years 5 years)
Annual survey
Requirements -Thickness measurements of areas found to be suspect areas at previous surveys are to be carried out -Where considered necessary by the Surveyor as a result of internal examination, the thickness measurement is to be carried out at the discretion of the Surveyor, where poor coating condition, corrosion or other defects are found in a ballast tank or where a protective coating has not been applied from the time of construction. Hatch covers and coamings -Thickness measurements of areas found to be suspect areas at previous surveys are to be carried out -Where considered necessary by the Surveyor as a result of the close-up survey, thickness measurements are to be carried out at the discretion of the Surveyor. Structural members in -Thickness measurements of areas found to be suspect areas cargo holds at previous surveys are to be carried out - Thickness measurements are to be carried out to an extent that determines both general and local corrosion levels at areas subject to close-up survey (may be partially dispensed with provided the Surveyor is satisfied by the results of the close-up survey : that there is no structural diminution and the protective coating remains effective). Structural members in -When extensive corrosion is found as a results of internal water ballast tanks examination, thickness measurements are to be carried out (ship’s age > 5 years) to the satisfaction of the Surveyor. Hatch covers and coamings -Where considered necessary by the Surveyor as a result of the close-up survey, thickness measurements are to be Structural members in carried out at the discretion of the Surveyor. cargo holds
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-4. General Dry Cargo Ships of not less than 500 gross tonnage Close-up Survey Surveys Compartments and Tanks Subject members Intermediate Hatch covers and coamings -All hatch cover plates and coamings*1 Survey All cargo holds (ships -Lower part of shell frames and their lower end brackets carrying timber cargoes, -Lower part of transverse bulkheads ship’s age > 5 years) -Air pipes and sounding pipes located on inner bottom plating Annual Hatch covers and coamings -All hatch cover plates and coamings*1 survey Cargo hold frames (ships carrying timber cargoes, -If considered necessary as a result of internal examinations, the *3 10 years 15 years) -Lower 1/3 length of minimum 25% part of shell frames*2*3 in the forward lower cargo hold and one other selected lower cargo hold *1: including their stiffeners *2: including their end attachments and adjacent shell platings *3: Where considered necessary by the Surveyor as a result of the close-up survey, the survey is to be extended to include a close-up survey of all of the shell frames and adjacent shell plating of those cargo holds and associated tween deck spaces (as applicable) as well as a close-up survey of lower 1/3 length of minimum 25% part of shell frames of all remaining cargo holds
Thickness measurements Surveys Subject Members Intermediate Structural members in water ballast tanks Survey Hatch covers and coamings Structural members in cargo holds (ships carrying timber cargoes, ship’s age > 5 years)
Annual Survey
(other than ships carrying timber cargoes) (ship’s age > 10 years) Structural members in water ballast tanks Hatch covers and coamings Structural members in cargo holds (ship’s age > 15 years)
Requirements -When extensive corrosion is found as a result of internal examination, thickness measurements are to be carried out to the satisfaction of the Surveyor. -When deemed necessary by the Surveyor as a result of close-up survey, thickness measurements are to be carried out to the satisfaction of the Surveyor. -Thickness measurements of structural members that were subject to close-up survey in all cargo holds is to be carried out to the same extent as the previous Special Survey (may be partially dispensed with provided the Surveyor is satisfied by the results of the close-up survey : that there is no structural diminution and the protective coating remains effective). -When deemed necessary by the Surveyor as a result of close-up survey, thickness measurements are to be carried out to the satisfaction of the Surveyor. -When extensive corrosion is found as a results of internal examination, thickness measurements are to be carried out to the satisfaction of the Surveyor. -When deemed necessary by the Surveyor as a result of close-up survey, thickness measurements are to be carried out to the satisfaction of the Surveyor.
-When deemed necessary by the Surveyor as a result of internal examination and close-up survey, thickness measurements are to be carried out to the satisfaction of the Surveyor.
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-5. Ships Carrying Liquefied Gases in Bulk Close-up Survey Surveys Compartments and Tanks Subject Members*3 Water ballast tanks (10 years 5 years)
Requirements -Where considered necessary by the Surveyor as a result of internal examination, the thickness measurement is to be carried out at the discretion of the Surveyor, where poor coating condition, corrosion or other defects are found in a ballast tank or where a protective coating has not been applied from the time of construction. -Where extensive corrosion is found as a results of internal examination, thickness measurements are to be carried out to the satisfaction of the Surveyor.
-6. Other Cargo Ships (ships except those specially specified in the above -1. -2. -3. -4. & -5) Close-up Survey Surveys Compartments and Tanks Subject Members Intermediate Survey － － － － Annual Survey Thickness measurements (ship’s age > 5 years) Surveys Subject Members Requirements Intermediate Structural members in -Where considered necessary by the Surveyor as a result of Survey water ballast tanks internal examination, the thickness measurement is to be carried out at the discretion of the Surveyor, where poor coating condition, corrosion or other defects are found in a ballast tank or where a protective coating has not been applied from the time of construction. Annual Structural members in -Where extensive corrosion is found as a results of internal Survey water ballast tanks examination, thickness measurements are to be carried out to the satisfaction of the Surveyor.
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Appendix 4-5 Diminution Limits and Judgement of Steel in Hull Structure and Equipment -1. (1)
(2) (3)
(4) (5) (6) -2. (1)
(2)
General rules These internal rules conform to the requirements of [1.4.5-3.] of Part B of the Rules, indicate the standard values for the diminution limit, and are to be used to judge the necessity of repairing important structural members and important equipment subject to wear and tear. If wear to structural members of hull or equipment exceeds the permissible diminution limit indicated in these rules, detailed inspections may be carried out, if necessary, and the defective items replaced by the date specified by the Surveyor. The diminution limits prescribed in these rules correspond to requirements during construction of members and dimensions given in the drawings, except where specifically stated. Therefore, if members with scantlings that significantly exceed the requirements and have a wide safety margin for strength are used during construction, the diminution limits of these members may be modified appropriately. The current rules may be used for the items below. (i) Longitudinal strength (ii) Equipment Number (iii) Direct strength calculations The diminution limits of structural hull members and equipment, which are not prescribed in these internal rules, are to be decided at the discretion of the Surveyor. These rules are applicable to structural members made of mild steel and high-tensile steel. In addition, regarding Bulk Carriers, please confirm our guidance “BULK CARRIER SAFETY Retroactive Requirements for existing bulk carriers”. Diminution limits Principal structural hull members other than below (2) (i) The diminution limits for plates and stiffeners are shown in Table 1. (ii) The diminution limits for longitudinal strength members given in Table 1. are based on the condition that the diminution limit of longitudinal strength of the hull has not been reached. (iii) The values of the diminution limit indicate limit values in case of uniform wear of members (Uniform wear is judged according to -3.) (iv) Notwithstanding Table 1, the diminution limits for local corrosion such as stress corrosion and pitting are to be decided at the discretion of the Surveyor. The standard diminution limit for local corrosion other than stress corrosion is to be taken as 40% of the original thickness. Structural members stipulated in 1.3.1(6), Part B of the Rules (i) The diminution limit for transverse bulkhead plates in cargo holds, to which the ”t net”concept applied, is given by the following formula. The values of the diminution limit indicate limit values in case of uniform wear of members (Uniform wear is judged according to (3).). t renewal (diminution limit)= t as built – 3.0 (mm) t as built : as built thickness (ii) The diminution limit for hatch cover and hatch coaming of bulk carriers, to which the ”t net” concept applied, is given by the following formula. The values of the diminution
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limit indicate limit values in case of uniform wear of members (Uniform wear is judged according to (3).). t renewal (diminution limit)= t as built – t c + 0.5 (mm) t as built : as built thickness t c: Corrosion addition specified in following Table Structural Member Type of structure Steel Hatch Cover Single plating type Double plating type Hatch Coaming
Corrosion addition t c（mm） For the top, side and For the internal bottom plating structures 2.0 2.0 1.5 1.5
(iii) The diminution limit for hatch cover and hatch coaming of ships other than bulk carriers, to which the ”t net” concept applied, is given by the following formula. The values of the diminution limit indicate limit values in case of uniform wear of members (Uniform wear is judged according to (3).). t renewal (diminution limit)= t as built – t c + 0.5 (mm) t as built : as built thickness t c: Corrosion addition specified in following Table In case of corrosion addition is 1.0 (mm), renewal thickness may be given by the formula of t renewal = t as built – t c (mm) Structural Member Type of structure Steel Hatch Cover Single plating type Double plating type
Corrosion addition t c（mm） For the top, side and For the internal bottom plating structures 2.0 (1.0 for the container carrier) 1.5 1.0 (1.0 for the container carrier)
Hatch Coaming
1.5
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Structural Member
Table 1
Permissible diminution level -Shell plates -Strength deck plates -Longitudinal beams (flat bar) on shear strake and 20% of original thickness + 1 mm strength deck - Tight bulkheads in deep tanks*1 -Inner bottom plates -Floors and girders in double bottom -Primary members (Example) (web & face) deck girder, hatch side girder, horizontal girder, web frame, web beam, (strong beam), deck transverse, side transverse, 25% of original thickness *2 bottom transverse, vertical web on longitudinal bulkhead, side stringer, cross tie, strut, pillar -Web, face and bracket of hold frames -Watertight bulkhead plates -Frames (excluding (Example) hold frames) bottom longitudinal, inner 30% of original thickness *3 -Beams bottom longitudinal, side -Stiffeners longitudinal, deck -Brackets longitudinal, deck beam, (web & face) -Effective deck plates -Hatch cover and hatch beam *1 The deep tank is a tank used for carriage of water, oil and other liquids, forming a part of the hull in holds or tween decks.
*2 For bulk carriers, the survey status of which has the Information “STRUCTURAL AND STABILITY REQUIREMENTS AGAINST FLOODING OF ALL CARGO HOLDS COMPLIED (in some cases, No.1 & 4 CARGO HOLD etc.).”(The ship complies with the requirements of 31A in Part C of the Rules), the permissible diminution limit of corrugated bulkhead plates is to be 3.0 mm. When diminution is within range 2.5 – 3.0 mm, coating or annual gauging is required. For ships that have the application for Classification Survey during Construction submitted to the Society on or after 1 July 2007, renewal thickness is given in the value indicated in the structural drawings in accordance with the requirements in 31A.3.6, Part C of the Rules. *3 For bulk carriers, building contract date of which is after 1st July 1998, the permissible diminution of the hatch covers located forward of 0.25L from the forward end of L is to be 1.5 mm. When diminution is within range 1.0 – 1.5 mm, coating or annual gauging is required. Further, when the plate of double plating type hatch cover is renewed, the surveyor needs to request the gauging of internal members, permissible diminution of which is to be 1.5 mm. *4 For each original thickness of steel, calculated value for the allowable diminution is shown to Table 2.
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diminution
original t
8.0 9.0 10.0 11.0 12.0 13.0 14.0 15.0 16.0 17.0 18.0 19.0 20.0 21.0 22.0 23.0 24.0 25.0 26.0 27.0 28.0 29.0 30.0 31.0 32.0 33.0 34.0 35.0 36.0 37.0 38.0 39.0 40.0 41.0 42.0 43.0 44.0 45.0 46.0 47.0 48.0
Table 2 Allowable Thickness of Steel (20% original) + 1.0mm 25% original 30% original Limit for Substantial Limit for Substantial Limit for Substantial Renewal Corrosion Renewal Corrosion Renewal Corrosion 5.4 6.1 6.0 6.5 5.6 6.2 6.2 6.9 6.8 7.4 6.3 7.0 7.0 7.8 7.5 8.2 7.0 7.8 7.8 8.6 8.3 9.0 7.7 8.6 8.6 9.5 9.0 9.8 8.4 9.3 9.4 10.3 9.8 10.6 9.1 10.1 10.2 11.2 10.5 11.4 9.8 10.9 11.0 12.0 11.3 12.2 10.5 11.7 11.8 12.9 12.0 13.0 11.2 12.4 12.6 13.7 12.8 13.9 11.9 13.2 13.4 14.6 13.5 14.7 12.6 14.0 14.2 15.4 14.3 15.5 13.3 14.8 15.0 16.3 15.0 16.3 14.0 15.5 15.8 17.1 15.8 17.1 14.7 16.3 16.6 18.0 16.5 17.9 15.4 17.1 17.4 18.8 17.3 18.7 16.1 17.9 18.2 19.7 18.0 19.5 16.8 18.6 19.0 20.5 18.8 20.4 17.5 19.4 19.8 21.4 19.5 21.2 18.2 20.2 20.6 22.2 20.3 22.0 18.9 21.0 21.4 23.1 21.0 22.8 19.6 21.7 22.2 23.9 21.8 23.6 20.3 22.5 23.0 24.8 22.5 24.4 21.0 23.3 23.8 25.6 23.3 25.2 21.7 24.1 24.6 26.5 24.0 26.0 22.4 24.8 25.4 27.3 24.8 26.9 23.1 25.6 26.2 28.2 25.5 27.7 23.8 26.4 27.0 29.0 26.3 28.5 24.5 27.2 27.8 29.9 27.0 29.3 25.2 27.9 28.6 30.7 27.8 30.1 25.9 28.7 29.4 31.6 28.5 30.9 26.6 29.5 30.2 32.4 29.3 31.7 27.3 30.3 31.0 33.3 30.0 32.5 28.0 31.0 31.8 34.1 30.8 33.4 28.7 31.8 32.6 35.0 31.5 34.2 29.4 32.6 33.4 35.8 32.3 35.0 30.1 33.4 34.2 36.7 33.0 35.8 30.8 34.1 35.0 37.5 33.8 36.6 31.5 34.9 35.8 38.4 34.5 37.4 32.2 35.7 36.6 39.2 35.3 38.2 32.9 36.5 37.4 40.1 36.0 39.0 33.6 37.2
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(2)
Hold frames The minimum plate thickness of web and brackets of hold frames is to conform to Table 3. Table 3 Length of ship (m) L < 150 150 ≤ L < 200 200 ≤ L Min. Thickness (mm) 6 7 7.5
(3)
Minimum thickness for high tensile steel members If high-tensile steel is used in bottom longitudinals of tankers with a single bottom construction, the wear and tear limit of the web is taken as 25% of the original thickness. If high-tensile steel is used in other structural members, the wear and tear limit is to be in accordance with (1) and (2) above. Anchor chain cable The diminution limit is to be taken as 12% of the original diameter. If a diameter that is one step above the prescribed diameter is used, a diameter that is one step below the diameter actually used may be taken as the original diameter when deciding the wear and tear limit (refer to Part C, Table [27.1] of the Rules). The wear and tear limit is to be judged by measuring the mean diameter of the chain cable and the shackle at locations which have been subjected to maximum wear. The mean diameter is to be calculated as shown in the figure below.
(4)
a average diameter =
a+b 2
b Section of anchor chain cable or shackle -3. (1) (2) (3)
Uniform corrosion of steel plates The status of corrosion mentioned below is to be treated as uniform corrosion Corrosion extending throughout frame Corrosion extending through the width of the plate (line corrosion in frames, floors, and beams, and linear corrosion in the area between floors, frames and beams) Pitting and local corrosion extending for more than 70% of the area of the plate (refer to the figure below) (i) If the entire plate is found uniformly corroded a’n a’n
(total plate area) × 0.7 < ∑ an
a4
an
:area of local corrosion
a2
a : area
a1 a3 Figure 1
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(ii)
If a part of the plate is treated as being uniformly corroded S1
S2
a’n acn
an Pb
an
Pb × S1 × 0.7 < ∑ an or Sc × S2 × 0.7 < ∑ acn
Sc
a1
a2
ac1 Figure 2
-4.
(1)
(2)
Measure against corrosion When remarkable corrosion is found in the results of thickness measurement, the Surveyor should examine the pattern and extent of the corrosion through intensive inspection or thickness measurement and take a necessary measure such as (1) & (2) below. Especially, in the case of oil tankers, chemical carriers and bulk carriers (including ore carriers), where substantial corrosion is found, the additional thickness measurement is required as shown in Appendix 4-3. Substantial corrosion is an extent of corrosion such that assessment of corrosion pattern indicates a wastage in excess of 75% of allowable margins, but within acceptable limits. Corrosion exceeding acceptable limit Repair such as renewal of the corroded plate exceeding acceptable limit should be required. However, special consideration may be given for structural members whose actual scantling surpasses much the Rule requirements. Substantial corrosion Necessary instruction for further inspection of corrosion which does not exceed acceptable limit, but where continuous monitoring is deemed necessary should be given. Substantial corrosion in excess of 75% of allowable margin is to be nominated as suspect areas and thickness measurement and necessary inspections of the area is to be carried out at subsequent Survey (Annual[except cargo tanks], Intermediate and Special Survey).
-5.
Thickness measurement results (ships applied to CSR-T and CSR-B) for areas subject to pitting corrosion, edge corrosion and grooving corrosion are to comply with the following respective criteria for each type of corrosion
(1)
Criteria for pitting corrosion are to be in accordance with following (a) to (c): (a) For plates with a pitting intensity of less than 20%, the measured thickness, tm, of any individual measurement is to meet the lesser of the following criteria: tm ≥ 0.7 (tas-built – tvol add) mm tm ≥ tren – 1 mm tas-built: As built thickness of the member under consideration (mm) tvol add: Voluntary thickness addition (mm) which is voluntarily added as the Owner’s extra
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(2)
(3)
margin for corrosion wastage in addition to tC tren: Renewal criteria for general corrosion (mm) as defined in Chapter 13, Part CSR-B or Section 12, Part CSR-T of the Rules tC: Corrosion addition (mm) as defined in Section 3 Chapter 3, Part CSR-B or 3 Section 6, Part CSR-T of the Rules tm: Measured thickness (mm) on one item, i.e. average thickness on one item using various measurements taken for this same item during the ship’s periodical in-service surveys. (b) The average thickness across any cross section of the plating is not to be less than the renewal criteria for general corrosion as specified in Chapter 13, Part CSR-B or Section 12, Part CSR-T of the Rules. (c) For the side structures of bulk carriers built under Part CSR-B of the Rules, notwithstanding provisions (a) and (b) above, criteria for pitting corrosion are to be in accordance with following i) and ii): i) If the pitting intensity in an area where coating is required, according to Section 5, Chapter 3, Part CSR-B of the Rules, is higher than 15%, an area of 300 mm or more, at the most pitted part of the plate, is to be cleaned to bare metal and the thickness is to be measured in way of the five deepest pits within the cleaned area in order to check the extent of the pitting corrosion. The smallest thickness measured in way of any of these pits is to be taken as the thickness to be recorded. ii) The minimum remaining thickness in pitting corrosion, grooving corrosion or other local areas is to be greater than the criteria below, without being greater than tren. ・ 75% of the as-built thickness, in the frame and end bracket webs and flanges ・ 70% of the as-built thickness, in the side shell, hopper tank and topside tank plating attached to the each side frame, over a width up to 30 mm from each side. Criteria for edge corrosion are to be in accordance with following (a) to (c): (a) Provided that the overall corroded height of the edge corrosion of a flange, or web in the case of flat bar stiffeners, is less than 25% of the stiffener flange breadth or web height, as applicable, the measured thickness, tm, is to satisfy the lesser of the following criteria: tm ≥ 0.7 (tas-built – tvol add) mm tm ≥ tren – 1 mm (b) The average measured thickness across the breadth or height of the stiffener is not to be less than that defined in Chapter 13, Part CSR-B or Section 12, Part CSR-T of the Rules. (c) Plate edges at openings for manholes, lightening holes etc. may be less than the minimum thickness as specified in Chapter 13, Part CSR-B or Section 12, Part CSR-T of the Rules subject to be in accordance with i) and ii) below: i) The maximum extent of the reduced plate thickness, below the minimum thickness defined in Chapter 13, Part CSR-B or Section 12, Part CSR-T of the Rules, from the opening edge is not more than 20% of the smallest dimension of the opening and does not exceed 100 mm. ii) Rough or uneven edges may be cropped-back provided that the maximum dimension of the opening is not increased by more than 10% and the remaining thickness of the new edge is not less than tren – 1 (mm) Criteria for grooving corrosion are to be in accordance with following (a) and (b): (a) Where the groove breadth is a maximum of 15% of the web height, but not more than 30 mm, the measured thickness, tm, in the grooved area is to satisfy the lesser of the following criteria, but is not to be less than 6 mm: tm ≥ 0.75 (tas-built – tvol add) mm
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(b)
tm ≥ tren – 0.5 mm Structural members with areas of grooving corrosion greater than those in (a) above are to be assessed based on the criteria for general corrosion as defined in Chapter 13, Part CSR-B or Section 12, Part CSR-T of the Rules using the average measured thickness across the plating/stiffener.
-6. Diminution limits on longitudinal strength (1) Bending strength (i) According to the Rules, transverse sections are to be gauged during the Special Survey No.2 for oil & chemical tanker, and during the Special Survey No.3 for the other ship. The results are to be entered in the survey record. Thickness measurements are mainly carried out to evaluate uniform corrosion in longitudinal strength members. The diminution limit (section modulus of hull calculated from measured values of dimensions or members) is given in Table 4. (ii) During measurement of longitudinal members at the cross section in the 0.5L amidship required by the rules, if the transverse sectional areas of deck flange (deck plating and deck longitudinals. For Oil & Chemical Tanker, all deck platings, longitudinals and girders within 0.1D (where D is the ship’s depth) ) and bottom flange (bottom shell plating and bottom longitudinals. For Oil & Chemical Tanker, all bottom shell platings, longitudinals and girders within 0.1D) exceeds 10% of the as-built area, NK branch office has to calculate the section modulus of hull by using the thickness of structural members measured and confirm them within the diminution limits, as shown in Table 4. (iii) For double hull oil tankers built under Part CSR-T of the Rules, notwithstanding provisions (1) and (2) above, it is to be confirmed that the condition of the ship satisfies the criteria specified in 1.5 Section 12, Part CSR-T of the Rules (iv)
For bulk carriers built under Part CSR-B of the Rules, notwithstanding provisions (1) and (2) above, it is to be confirmed that the condition of the ship satisfies the criteria specified in 1.4 Section 2 Chapter 13, Part CSR-B of the Rules
(v)
Where repairs are carried out to satisfy the requirements of the preceding (i) or (ii), the ship’s longitudinal strength for other transverse sections is to be evaluated by using the result of additional thickness measurements.
(vi)
For oil tankers of not less than 130m in length for freeboard, the result of the final evaluation of the ship’s longitudinal strength carried out after the ship reaches 10 years of age is to be reported as a part of the condition evaluation report.
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Table 4 Hull section modulus Applied rule Ship’s length 1964 version to 1972version for freeboard 1973 version to (except case where “fdB” formula applied) Lf(m) 1986 version Oil Tanker Other ship Lf ≤ 60
Rule requirement
60 < Lf < 130
Lf ≥ 130
(2)
Rule requirement or 0.9 Wmin × k, whichever is greater. where: Wmin: Hull section modulus specified in 15.2.1-2, Part C of the Rules k: Material factor specified in 1.1.7-2, Part C of the Rules.
Rule requirement
80% of rule requirement (77% for oil tankers and chemical tankers) To be determined by interpolation 90% of rule requirement (87% for oil tankers and chemical tankers)
Others 80% of rule requirement
To be determined by interpolation 90% of rule requirement
Shear strength Shear strength is to be calculated in case of the following (i) or (ii): (i) Average corrosion of any strake in side shell or longitudinal bulkhead of oil tankers or chemical tankers exceeds 3.0mm, or (ii) Average corrosion of any strake in side shell or longitudinal bulkhead of ore carriers or bulk carriers intended for alternate loading exceeds 2.5mm.
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Appendix 4-6 Guidelines for Coating Assessment for Ballast tanks on Tankers Coating Conditions These Guidelines focus on survey of coatings for ballast tanks on tankers. The coating system in ballast tanks is to be examined in connection with: • Intermediate Surveys for tankers exceeding 5 years of age, • Special Surveys for all tankers The condition of the coating in ballast tanks is assigned and categorised as GOOD, FAIR or POOR based on visual inspection and estimated percentage of areas with coating failure and rusty surfaces. (see Table I). a)
GOOD, FAIR, POOR The definitions of coating conditions “GOOD”, “FAIR” and “POOR” are as follows: GOOD: FAIR:
POOR:
condition with only minor spot rusting condition with local breakdown of coating at edges of stiffeners and weld connections and/or light rusting over 20% or more of areas under consideration, but less than as defined for POOR condition condition with general breakdown of coating over 20% or more of areas or hard scale at 10% or more of areas under consideration
In these Guidelines, a clarification of these definitions is given in order to achieve unified assessment of coating conditions as follows, see also Table I below: GOOD: Condition with spot rusting on less than 3% of the area under consideration without visible failure of the coating. Rusting at edges or welds, must be on less than 20 % of edges or weld lines in the area under consideration. FAIR: Condition with breakdown of coating or rust penetration on less than 20 % of the area under consideration. Hard rust scale rust penetration must be less than 10 % of the area under consideration. Rusting at edges or welds must be on less than 50 % of edges or weld lines in the area under consideration. POOR: Condition with breakdown of coating or rust penetration on more than 20% or hard rust scale on more than 10% of the area under consideration or local breakdown concentrated at edges or welds on more than 50 % of edges or weld lines in the area under consideration.
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Table I IACS clarification of “GOOD”, “FAIR” and “POOR” coating conditions GOOD (3) < 3% -
FAIR 3 – 20 % < 10 %
POOR > 20 % ≥ 10 %
Breakdown of coating or area rusted (1) Area of hard rust scale (1) Local breakdown of coating or rust on < 20 % 20 – 50 % > 50 % edges or weld lines (2) Notes (1) % is the percentage of the area under consideration or of the “critical structural area” (2) % is the percentage of edges or weld lines in the area under consideration or of the “critical structural area” (3) spot rusting i.e. rusting in spot without visible failure of coating These clarifications are further exemplified via photos along with narrative descriptions of the condition, uniform and localised assessment scales, in the enclosed Figure 1 while a “Library of pictures” is provided in Figure 2. b)
Areas under consideration The term “areas under consideration” found in the definitions of coating condition “FAIR” and “POOR” is clarified in the following. Recognizing that different areas in the tank experience different coating breakdown and corrosion patterns, the intent is to subdivide the planar boundaries of the tank for evaluation of coating, into areas small enough to be readily examined and evaluated by the Surveyor, but not so small as to be structurally insignificant or too numerous to practically report on. Each area is then rated (GOOD, FAIR or POOR) and the tank rating is then to be not higher then the rating of its “area under consideration” having the lowest rating. Special attention should be given to coating in Critical Structural Areas which are defined as “locations which have been identified from calculations to require monitoring or from the service history of the subject ship or from similar or sister ships (if available) to be sensitive to cracking, buckling or corrosion which would impair the structural integrity of the ship”. Each Critical Structural Area is rated (GOOD, FAIR or POOR) applying Table I and the rating of each “area under consideration” is then to be not higher than the rating of its Critical Structural Area (if present) having the lowest rating. The “area under consideration” with the poorest coating condition will determine whether examination of ballast tanks is required at subsequent Annual Surveys. Hence, it is not intended to “average” the coating condition for all “areas under consideration” within a tank, to determine an “average” coating condition for the entire tank. When examination of ballast tanks is required at subsequent Annual Surveys, all “areas under consideration” in POOR condition and adjacent areas are to be examined. Where coating condition of the adjacent areas is found in POOR condition, the examination is to be extended as deemed necessary by the surveyor. Definitions of “areas under consideration” are as follows (also illustrated for a Wing ballast tank, a fore peak ballast and aft peak tank in Figure I, Figure II, Figure III below, respectively): SINGLE HULL TANKER - WING BALLAST TANKS Deck and bottom Areas of deck and bottom plating with attached structure (one (1) area to consider for deck and one (1) area to consider for bottom). Side shell and longitudinal bulkheads
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Areas of side shell and longitudinal bulkheads with attached structure, in lower, middle and upper third (three (3) areas to consider for side shell and three (3) areas to consider for longitudinal bulkhead). Transverse bulkheads (forward and aft) Areas of transverse bulkhead and attached stiffeners, in lower, middle and upper third (three (3) areas to consider for forward transverse bulkhead and three (3) areas to consider for aft transverse bulkhead). DOUBLE HULL TANKER - Double bottom ballast tank Areas of tank boundaries and attached structure, in lower and upper half of tank (two (2) areas to consider). - Double hull side ballast tank Deck and bottom Areas of deck and bottom plating with attached structure (one (1) area to consider for deck and one (1) area to consider for bottom). Side shell and longitudinal bulkheads Areas of side shell and longitudinal bulkheads with attached structure, in lower, middle and upper third (three (3) areas to consider for side shell and three (3) areas to consider for longitudinal bulkhead). Transverse bulkheads (forward and aft) Areas of transverse bulkhead and attached stiffeners, in lower, middle and upper third (three (3) areas to consider for forward transverse bulkhead and three (3) areas to consider for aft transverse bulkhead).
Figure I “areas under consideration” indicated for a Wing Ballast Tank, from one side, i.e., deck, side shell and transverse bulkheads forward.
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GUIDANCE FOR UNDERGOING CLASS MAINTENANCE SURVEYS
- FORE PEAK BALLAST TANKS Areas of tank boundaries and attached structure, in upper, middle and lower third of tank (three (3) areas to consider).
Figure II “areas under consideration” indicated for a Fore Peak Ballast Tank
- AFTER PEAK BALLAST TANKS Areas of tank boundaries and attached structure, in lower and upper half of tank (two (2) areas to consider).
Figure III “areas under consideration” indicated for an Aft Peak Tank
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GUIDANCE FOR UNDERGOING CLASS MAINTENANCE SURVEYS
Figure 1. Examples of assessment of coating conditions
Figure a - Assessment scale for breakdown
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GUIDANCE FOR UNDERGOING CLASS MAINTENANCE SURVEYS
Figure 2. Photos of coating condition
Notes: Condition: GOOD spot rusting: scattered 1% spot rusting on edges or weld lines: localised less than 5% Assessment scale:
Figure b - Coating Condition Evaluation
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GUIDANCE FOR UNDERGOING CLASS MAINTENANCE SURVEYS
Notes: Condition: FAIR Breakdown of coating/area rusted: localised 15-20% Area of hard rust scale: Less than 10% of the area rusted Local breakdown of coating or rust on edges or weld lines: 30-40% Remarks: FAIR for longitudinal close to bottom, remaining surface; GOOD Assessment scale:
Figure c - Coating Condition Evaluation
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GUIDANCE FOR UNDERGOING CLASS MAINTENANCE SURVEYS
Notes: Condition: POOR Breakdown of coating/area rusted: approx. 30% Area of hard rust scale: More than 10% of the area rusted Local breakdown of coating or rust on edges or weld lines: 30-40% Assessment scale:
Figure d - Coating Condition Evaluation
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GUIDANCE FOR UNDERGOING CLASS MAINTENANCE SURVEYS
Appendix 4-7 Repair (Wastage and Damage Association with Wastage) Extract from IMO Res. A 744 AMENDMENTS TO THE GUIDELINES ON THE ENHANCED PROGRAMME OF INSPECTIONS DURING SURVEYS OF BULK CARRIERS AND OIL TANKERS FOR BULK CARRIERS 1.3 Repairs 1.3.1 Any damage in association with wastage over the allowable limits (including buckling, grooving, detachment or fracture), or extensive areas of wastage over the allowable limits, which affects or, in the opinion of the Administration, will affect the ship’s structural, watertight or weathertight integrity, should be promptly and thoroughly repaired. Areas which should be considered include: .1 side shell frames, their end attachments or adjacent shell plating; .2 deck structure and deck plating; .3 bottom structure and bottom plating; .4 watertight or oiltight bulkheads; and .5 hatch covers or hatch coamings. Where adequate repair facilities are not available, the Administration may allow the ship to proceed directly to a repair facility. This may require discharging the cargo and/or temporary repairs for the intended voyage. 1.3.2 Additionally, when a survey results in the identification of corrosion or structural defects, either of which, in the opinion of the Administration, will impair the ship’s fitness for continued service, remedial measures should be implemented before the ship continues in service. FOR OIL TANKERS 1.3 Repairs 1.3.1 Any damage in association with wastage over the allowable limits (including buckling, grooving, detachment or fracture), or extensive areas of wastage over the allowable limits, which affects or, in the opinion of the Administration, will affect the ship’s structural, watertight or weathertight integrity, should be promptly and thoroughly (see 1.2.14) repaired. Areas to be considered include: .1 bottom structure and bottom plating; .2 side structure and side plating; .3 deck structure and deck plating; .4 inner bottom structure and inner bottom plating; .5 inner side structure and inner side plating; .6 longitudinal bulkhead(s) structure and longitudinal bulkhead(s) plating, where fitted; .7 transverse watertight or oiltight bulkheads structure and transverse watertight or oiltight bulkheads plating; .8 hatch covers or hatch coamings, where fitted; and .9 items in paragraph 3.3.
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GUIDANCE FOR UNDERGOING CLASS MAINTENANCE SURVEYS
Where adequate repair facilities are not available, the Administration may allow the ship to proceed directly to a repair facility. This may require discharging the cargo and/or temporary repairs for the intended voyage. 1.3.2 Additionally, when a survey results in the identification of corrosion or structural defects, either of which, in the opinion of the Administration, will impair the ship’s fitness for continued service, remedial measures should be implemented before the ship continues in service. where; 3.3 Examination of weather decks 3.3.1 Examination of cargo tank openings including gaskets, covers, coamings and flame screens. 3.3.2 Examination of cargo tank pressure/vacuum valves and flame screens. 3.3.3 Examination of flame screens on vents to all bunker and oily slop tanks. 3.3.4 Examination of cargo, crude oil washing, bunker and vent piping systems, including vent masts and headers. 1.2.14 A prompt and thorough repair is a permanent repair completed at the time of survey to the satisfaction of the Surveyor, therein removing the need for the imposition of any associated condition of classification or recommendation.
Extract from IACS UR Z7 Hull Classification Surveys
1.3 Repairs 1.3.1 Any damage in association with wastage over the allowable limits (including buckling, grooving, detachment or fracture), or extensive areas of wastage over the allowable limits, which affects or, in the opinion of the Surveyor, will affect the vessel’s structural, watertight or weathertight integrity, is to be promptly and thoroughly (see 1.2.11) repaired. Areas to be considered include: - side shell frames, their end attachments and adjacent shell plating; - deck structure and deck plating; - bottom structure and bottom plating; - watertight or oiltight bulkheads; - hatch covers and hatch coamings; - items in 3.2.3.5, 3.2.3.6 and 3.2.3.8. For locations where adequate repair facilities are not available, consideration may be given to allow the vessel to proceed directly to a repair facility. This may require discharging the cargo and/or temporary repairs for the intended voyage. 1.3.2 Additionally, when a survey results in the identification of structural defects or corrosion, either of which, in the opinion of the Surveyor, will impair the vessel’s fitness for continued service, remedial measures are to be implemented before the ship continues in service. where; 1.2.11 Prompt and Thorough Repair A Prompt and Thorough Repair is a permanent repair completed at the time of survey to the satisfaction of the Surveyor, therein removing the need for the imposition of any associated condition of classification.
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GUIDANCE FOR UNDERGOING CLASS MAINTENANCE SURVEYS
3.2.3.5 Examination of the weld connection between air pipes and deck plating. 3.2.3.6 External examination of all air pipe heads installed on the exposed decks. 3.2.3.8 Examination of ventilators, including closing devices, if any. Extract from IACS UR Z7 Hull Surveys for General Dry Cargo Ships
1.3 Repairs 1.3.1 Any damage in association with wastage over the allowable limits (including buckling, grooving, detachment or fracture), or extensive areas of wastage over the allowable limits, which affects or, in the opinion of the Surveyor, will affect the vessel’s structural, watertight or weathertight integrity, is to be promptly and thoroughly (see 1.2.14) repaired. Areas to be considered include: - side shell frames, their end attachments and adjacent shell plating; - deck structure and deck plating; - bottom structure and bottom plating; - watertight bulkheads; - hatch covers and hatch coamings. - items in 3.2.3.5, 3.2.3.6 and 3.2.3.8 of UR Z7. For locations where adequate repair facilities are not available, consideration may be given to allow the vessel to proceed directly to a repair facility. This may require discharging the cargo and/or temporary repairs for the intended voyage. 1.3.2 Additionally, when a survey results in the identification of structural defects or corrosion, either of which, in the opinion of the surveyor, will impair the vessel’s fitness for continued service, remedial measures are to be implemented before the ship continues in service. 1.2.14 Prompt and Thorough Repair A Prompt and Through Repair is a permanent repair completed at the time of survey to the satisfaction of the surveyor, therein removing the need for the imposition of any associated condition of classification.
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Appendix 5
SURVEY PROGRAMME(example)
SURVEY PROGRAMME for Single Skin Bulk Carriers Basic Information and Particulars Name of Ship : NK BULKER I IMO Number : 8888888 Flag State : Panama Port of Registry : Panama Gross Tonnage : 37,000 Deadweight (metric tonnes) : 80,000 Length between perpendiculars (m) : 215.00 Shipbuilder : NK Heavy Industries Hull number : 555 Recognized Organization (RO) : Nippon Kaiji Kyokai RO Ship Identity (Class Number) : 899999 Date of delivery of the ship : 1989 December 1 Owner : NK Shipping Thickness Measurement Firm : NK TM co. Even if the Special Survey / Intermediate Survey is divided to commencement and completion, all survey items are to be listed in the programme. Prepared by the owner in co-operation with the Classification Society. Survey programme is to be verified by NK surveyor prior to coming Special Survey / Intermediate Survey. Date :
1 January 2014
(
Alex N.K.
)
(name and signature of authorized owner’s representative)
Date :
( ) Surveyor to Nippon Kaiji Kyokai Branch/Office - 151 -
GUIDANCE FOR UNDERGOING CLASS MAINTENANCE SURVEYS
1 Preamble 1.1 Scope 1.1.1 The present Survey Programme covers the minimum extent of overall surveys, close-up surveys, thickness measurements and pressure testing within the cargo length area, cargo holds, ballast tanks, including fore and aft peak tanks, required by the NK Rules. 1.1.2 The arrangements and safety aspects of the survey should be acceptable to the attending surveyor(s). 1.2 Documentation All documents used in the development of the survey programme should be available onboard during the survey. 2 Arrangement of Cargo holds, tanks and spaces This section of the survey programme should provide information (either in the form of plans or text) on the arrangement of cargo holds, tanks and spaces that fall within the scope of the survey. Hold & Tank Arrangement*/Hold & Tank List*, which is attached to next page is to be referred. (*: Delete as appropriate)
3.
List of cargo holds, tanks and spaces with information on their use, extent of coatings and corrosion protection system This section of the survey programme should indicate any changes relating to (and should update) the information on the use of the cargo holds and ballast tanks of the ship, the extent of coatings and the corrosion protective system provided in the Survey Planning Questionnaire. Spaces
Fr. No
Corrosion Protection (1)
Coating Extent (2)
Coating Condition (3)
1) HC=hard coating; SC=soft coating; A=anodes; NP=no protection; CS=clad steel; SS=stainless steel 2) U=upper part; M=middle part; L=lower part; C=complete 3) G=good; F=fair; P=poor, RC=recoated (during the last 3 years)
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GUIDANCE FOR UNDERGOING CLASS MAINTENANCE SURVEYS
Hold & Tank Arrangement*/Hold & Tank List* (*: Delete as appropriate)
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GUIDANCE FOR UNDERGOING CLASS MAINTENANCE SURVEYS
4
Conditions for survey
This section of the survey programme should provide information on the conditions for survey, e.g. information regarding cargo hold and tank cleaning, gas freeing, ventilation, lighting, etc. 4.1 4.2
The owner should provide the necessary facilities for a safe execution of the survey. In order to enable the attending surveyors to carry out the survey, provisions for proper and safe access should be agreed between the owner and NK. 4.3 In cases where the provisions of safety and required access are judged by the attending surveyors not to be adequate, the survey of the spaces involved should not proceed. 4.4 Cargo holds, tanks and spaces are to be safe for access. Cargo holds, tanks and spaces should be gas free and properly ventilated. Prior to entering a tank, void or enclosed space, it should be verified that the atmosphere in that space is free from hazardous gas and contains sufficient oxygen. 4.5 Cargo holds, tanks and spaces should be sufficiently clean and free from water, scale, dirt, oil residues, sediments etc., to reveal corrosion, deformation, fractures, damages or other structural deterioration as well as the condition of the coating. In particular this applies to areas which are subject to thickness measurement. 4.6 Sufficient illumination should be provided to reveal significant corrosion, deformation, fractures, damages or other structural deterioration as well as the condition of the coating. 4.7 The attending surveyor(s) should always be accompanied by at least one responsible person assigned by the Company experienced in tank and enclosed spaces inspection. In addition a backup team of at least two experienced persons should be stationed at the hatch opening of the tank or space that is being surveyed. The back-up team should continuously observe the work in the tank or space and should keep lifesaving and evacuation equipment ready for use. 4.8 Where Soft Coatings have been applied, safe access should be provided for the surveyor to verify the effectiveness of the coating and to carry out an assessment of the conditions of internal structures, which may include spot removal of the coating. When safe access cannot be provided, the soft coating should be removed. 4.9 A communication system is to be arranged between the survey party in the tank or space being examined, the responsible officer on deck and, as the case may be, the navigation bridge. The communication arrangements are to be maintained throughout the survey. This system should also include the personnel in charge of ballast pump handling if boats or rafts are used. 4.10 Survey at sea or at anchorage may be accepted provided the surveyor is given the necessary assistance from the personnel on board. Complete cargo/ballast discharge to be confirmed by :
Chief Officer & Shipyard staff
O2 content measurement and gas detection to be confirmed by : Cleanliness in cargo holds/ballast tanks to be confirmed by :
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Chief Officer & Shipyard staff
Chief Officer & Shipyard staff
GUIDANCE FOR UNDERGOING CLASS MAINTENANCE SURVEYS
5
Provisions and method of access to structures
This section of the survey programme should indicate any changes relating to (and should update) the information on the provisions and methods of access to structures provided in the Survey Planning Questionnaire. Hold/Tank No. F.P.
Tanks
Wing tanks of double Ore Carriers
Hopper Tanks
Topside
Cargo Holds
A.P.
Structure
Temporary staging
Fore Peak Aft Peak Hatch side coamings Topside sloping plate Upper stool plating Cross deck Side shell, frames and brackets Transverse bulkhead Hopper tank platting Lower stool Tank top Underdeck structure Side shell and structure Sloping plate and structure Webs and bulkheads Hopper sloping plate and structure Side shell and structure Bottom structure Webs and bulkheads Double bottom structure Upper stool internal structure Lower stool internal structure Underdeck and structure Side shell and structure Side shell vertical web and structure Longitudinal bulkhead and structure Longitudinal bulkhead web and structure Bottom plating and structure Cross ties/stringers
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Rafts
Ladders
Direct access
Other means (please specify)
GUIDANCE FOR UNDERGOING CLASS MAINTENANCE SURVEYS
5.1
For overall survey, means should be provided to enable the surveyor to examine the structure in a safe and practical way. 5.2 For close-up surveys, one or more of the following means for access, acceptable to the surveyor, should be provided: (1) For close-up surveys of the hull structure, other than cargo hold shell frames: (a) Permanent staging and passages through structures (b) Temporary staging and passages through structures (c) Lifts and movable platforms (d) Boats or rafts provided the structural capacity of the tank is sufficient to withstand static loads at all levels of water (e) Portable ladders (f) Other equivalent means (2) For close-up surveys of the cargo hold shell frames of bulk carriers less than 100,000DWT: (a) Permanent staging and passages through structures (b) Temporary staging and passages through structures (c) Portable ladder restricted to not more than 5m in length may be accepted for surveys of lower section of a shell frame including bracket (d) Hydraulic arm vehicles such as conventional cherry pickers, lifts and movable platforms (e) Boats or rafts provided the structural capacity of the hold is sufficient to withstand static loads at all levels of water (f) Other equivalent means (3) For close-up surveys of the cargo hold shell frames of bulk carriers of 100,000DWT or more: (a) For Special survey No.1: i) Permanent staging and passages through structures ii) Temporary staging and passages through structures iii) Hydraulic arm vehicles such as conventional cherry pickers, lifts and movable platforms iv) Boats or rafts provided the structural capacity of the hold is sufficient to withstand static loads at all levels of water v) Other equivalent means Notwithstanding the above, the use of a portable ladder fitted with a mechanical device to secure the upper end of the ladder is acceptable for the close-up survey of side frames at Annual surveys. However, it is not acceptable for the close-up survey of suspect area identified at the previous survey or the ongoing survey. (b) For Subsequent Intermediate Surveys and Special surveys: i) Permanent staging and passages through structures ii) Temporary staging and passages through structures iii) Hydraulic arm vehicles such as conventional cherry pickers for surveys of lower and middle part of side frames iv) Lifts and movable platforms v) Boats or rafts provided the structural capacity of the hold is sufficient to withstand static loads at all levels of water vi) Other equivalent means 5.3 Surveys of tanks by means of boats or rafts may only be undertaken with the agreement of the surveyor, who should take into account the safety arrangements provided, including weather forecasting and ship response in reasonable sea conditions. 5.4 When rafts or boats will be used for close-up survey conditions to keep safety and effectiveness should comply with the equivalent criteria for the cases on tankers. - 156 -
GUIDANCE FOR UNDERGOING CLASS MAINTENANCE SURVEYS
6
List of equipment for survey
This section of the survey programme should identify and list the equipment that will be made available for carrying out the survey and the required thickness measurements. The following safety equipment is available on board. a) O2 content meter / Type : (Manufacturer’s name) / (Type) Accuracy to be checked by : Chief Officer, Annually calibrated by ashore Company b) Gas detector / Type : (Manufacturer’s name) / (Type) Accuracy to be checked by : Chief Officer, Annually calibrated by ashore Company c) Portable Safety Light / No.: 6 sets of explosive proof type d) Available breathing apparatus: 6 sets of SCBA type e) Other safety equipment, if any: Safety Helmet, Safety Shoes, Lifeline, Gloves Walkie talkie, etc.
f) Are the other safety equipment also available at repair yard ? Yes / No 7 7.1
Survey requirements Overall survey
This section of the survey programme should identify and list the spaces that should undergo a overall survey in accordance with the requirements of the Rules. See, Appendix 3.1 – Overall Survey Requirements .1 Cargo Hold All cargo holds
.2 Ballast Tank All water ballast tanks
.3 Other Tanks/Spaces All fuel oil tanks All lubrication oil tanks All fresh water tanks Cofferdam Engine Room Void Spaces
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GUIDANCE FOR UNDERGOING CLASS MAINTENANCE SURVEYS
7.2
Close-up survey
This section of the survey programme should identify and list the hull structures that should undergo a close up survey for the ship in accordance with the requirements of the Rules. See, Appendix 3.2 – Close-up Survey Requirements .1
Ballast tanks Structural members One web frame ring Half of web frame rings All web frame rings
Tank N.A. N.A. No.1-5 Top side tanks, FPT, APT N.A. No.1-5 Top side tanks, FPT, APT
Both T.BHDs All T.BHDs
.2
No.1-5 Bilge hopper tanks,
Cargo holds Location All hold frames with shell Lower part of one T.BHD All plates of T.BHDs Decks (cross deck) Hatch covers and coamings
8
No.1-5 Bilge hopper tanks,
Hold No.1-7 Cargo holds N.A. No.1-7 Cargo holds No.1-7 Cargo holds No.1-7 Cargo holds
Identifications of tanks for tank testing
This section of the survey programme should identify and list the tanks that should undergo tank testing for the ship in accordance with the Rules. See, Appendix 3.3 – Tank Testing Requirements Ballast Tanks:
All
Deep Ballast Hold
No.4 Cargo hold
Fuel Oil Tanks: Lubrication Oil Tanks: Fresh Water Tanks:
All All All
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GUIDANCE FOR UNDERGOING CLASS MAINTENANCE SURVEYS
9
Minimum thickness of hull structures
This section of the survey programme should specify the minimum thickness for hull structures of the ship that are subject to the Guidelines (indicate either (a) or preferably (b), if such information is available): (a)
Determined from the attached* wastage allowance table and the original thickness according to the hull structure plans of the ship;
(b)
Given in the following table(s)
*: The wastage allowance tables should be attached to the survey programme.
See, Appendix 3.5 – The Wastage Allowance 10
Thickness measurement company
This section of the survey programme should identify changes, if any, relating to the information on the thickness measurement company provided in the Survey Planning Questionnaire. No change of TM firm nominated in Survey Planning Questionnaire
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GUIDANCE FOR UNDERGOING CLASS MAINTENANCE SURVEYS
11
Identification of areas and sections for thickness measurements
This section of the survey programme should identify the areas and sections where thickness measurements should be taken in accordance with the Rules. See, Appendix 3.4 – Thickness Measurement Requirements Location Suspect area:
■Applicable
TM requirements □ Not Applicable
Structural members subject to close-up survey Each deck plating outside line of cargo hatch openings All deck plating
■ Applicable
□ Not Applicable
□ Applicable
■ Not Applicable
Each bottom plate
□ Applicable
■ Not Applicable
Transverse section:
□
■
Sea paragraph 7.2
Selected wind and water strake outside cargo area Wind and water strakes in 2 transverse sections All wind and water strakes within cargo area All wind and water strakes full length Internals in FPT & APT All main deck plate outside of cargo length area Representative exposed superstructure deck plate All keel plates full length Additional bottom plates Others:
1 section,
■ Applicable
2 sections, Fr.130, Fr.195 □ Not Applicable
□ Applicable
■ Not Applicable
■ Applicable
□ Not Applicable
□ Applicable
■ Not Applicable
■ Applicable
□ Not Applicable
□ Applicable
■ Not Applicable
□ Applicable
■ Not Applicable
□ Applicable
■ Not Applicable
□ Applicable
■ Not Applicable
Nil.
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□
3 sections
GUIDANCE FOR UNDERGOING CLASS MAINTENANCE SURVEYS
12
Damage experience related to the ship
This section of the survey programme should, using the tables provided below, provide details of the hull damages for at least the last three years in way of the cargo and ballast tanks and void spaces within the cargo area. These damages are subject to survey. Hull damages sorted by location for this ship Cargo Hold, Tank or space number or area
Possible cause, if known
Description of the damages
Location
Repair
Date of repair
Hull damages for sister or similar ships (if available) in the case of design related damage Cargo Hold, Tank or space number or area No.4 BHT(P)
Possible cause, if known
Description of the damages
Location
Repair
Crack on the trans. web on Trans. web Renewed hopper plate around slot
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Date of repair 2001 Jan.
GUIDANCE FOR UNDERGOING CLASS MAINTENANCE SURVEYS
13
Areas identified with substantial corrosion from previous surveys
This section of the survey programme should identify and list the areas of substantial corrosion from previous surveys. Nil.
14
Critical structural areas and suspect areas
This section of the survey programme should identify and list the critical structural areas and the suspect areas, if such information is available. Lower stool of trans.Bhd between No.3-4 C/H and No.4-5 C/H are assigned as suspect area due to substantial corrosion.
15
Other relevant comments and information
This section of the survey programme should provide any other comments and information relevant to the survey.
Nil.
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GUIDANCE FOR UNDERGOING CLASS MAINTENANCE SURVEYS
Appendices Appendix 1 - List of Plans The Rules require that main structural plans of cargo and ballast tanks (scantling drawings), including information on regarding use of high tensile steel (HTS), to be available. This appendix of the survey programme should identify and list the main structural plans which form part of the survey programme. Appendix 2 - Survey Planning Questionnaire The Survey Planning Questionnaire, which has been submitted by the owner, should be appended to the survey programme. Appendix 3 - Other documentation This part of the survey programme should identify and list any other documentation that forms part of the survey programme. .1
Overall Survey Requirements, as referred to Paragraph 7.1 “Overall survey” is attached to this survey programme.
.2
Close-up Survey Requirements, as referred to Paragraph 7.2 “Close-up survey” is attached to this survey programme.
.3
Tank Testing Requirements, as referred to Paragraph 8 “Identification of tanks for tank testing” is attached to this survey programme.
.4
Thickness Measurement Requirements, as referred to Paragraph 11 “Identification of areas and sections for thickness measurements” is attached to this survey programme.
.5
The Wastage Allowance, as referred to Paragraph 9 “Minimum thickness of hull structures” is attached to this survey programme.
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GUIDANCE FOR UNDERGOING CLASS MAINTENANCE SURVEYS
Appendix 1 - List of Plans 1.
Basic ship information and particulars; See, attached survey status
2. -
Main structural plans of cargo holds and ballast tanks (scantling drawings), including information regarding use of high tensile steels (HTS); Midship Section and Typical Trans. BHD Construction Profile & Decks Shell Expansion (Fore & Aft) Transverse Bulkheads Forward Construction Afterward Construction
-
Arrangements of Tanks; General Arrangement
3.
4.
List of tanks with information on their use, extent of coatings and corrosion protection systems; See, paragraph 3 of SURVEY PROGRAMME.
5.
Conditions for survey (e.g. information regarding tank cleaning, gas freeing, ventilation, lighting, etc.); See, paragraph 4 of SURVEY PROGRAMME.
6.
Provisions and methods for access to structures; See, paragraph 5 of SURVEY PROGRAMME.
7.
Equipment for survey; See, paragraph 6 of SURVEY PROGRAMME.
8.
Identification of tanks and areas for the close-up survey; See, paragraph 7.2 of SURVEY PROGRAMME.
9.
Identification of areas and sections for thickness measurement; See, paragraph 11 of SURVEY PROGRAMME.
10. Identification of tanks for tank testing; See, paragraph 8 of SURVEY PROGRAMME and General Arrangement. 11.
Identification of the thickness measurement company; See, paragraph 10 of SURVEY PROGRAMME.
12.
Damage experience related to the ship in question; and See, paragraph 12 of SURVEY PROGRAMME.
13.
Critical Structural and Suspect Areas, where relevant. See, paragraph 14 of SURVEY PROGRAMME. - 164 -
GUIDANCE FOR UNDERGOING CLASS MAINTENANCE SURVEYS
Appendix 2 - SURVEY PLANNING QUESTIONNAIRE The following information will enable the owner in co-operation with ClassNK to develop a survey programme complying with the requirements of the Rules. It is essential that the owner provides, when completing the present questionnaire, up-to-date information. The present questionnaire, when completed, should provide all information and material required by the Rules. Particulars Ship's name : NK BULKER I IMO number : 8888888 Flag State : Panama Port of registry : Panama Owner : NK Shipping RO ship identity (Class Number) : 899999 Gross tonnage : 37,000 Deadweight (metric tonnes) : 80,000 Date of delivery : 1 December 1989
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GUIDANCE FOR UNDERGOING CLASS MAINTENANCE SURVEYS
Information on access provision for close-up surveys and thickness measurement: The owner should indicate, in the table below, the means of access to the structures subject to close-up survey and thickness measurement. A close-up survey is an examination where the details of structural components are within the close visual inspection range of the attending surveyor, i.e. preferably within reach of hand. Table SPQ1 Hold/Tank No. F.P.
Tanks
Wing tanks of double Ore Carriers
Hopper Tanks
Topside
Cargo Holds
A.P.
Structure Fore Peak Aft Peak Hatch side coamings Topside sloping plate Upper stool plating Cross deck Side shell, frames and brackets Transverse bulkhead Hopper tank plating Lower stool Tank top Underdeck structure Side shell and structure Sloping plate and structure Webs and bulkheads Hopper sloping plate and structure Side shell and structure Bottom structure Webs and bulkheads Double bottom structure Upper stool internal structure Lower stool internal structure Underdeck and structure Side shell and structure Side shell vertical web and structure Longitudinal bulkhead and structure Longitudinal bulkhead web and structure Bottom plating and structure Cross ties/stringers
Temporary staging
Rafts
√
Ladders
√
√
Direct access
Other means (please specify)
√ √ Cherry picker Cherry picker Cherry picker
√ √ √ √
√
√
√
√ √ √
√
√
√
√ √ √ √
√
√ √
Applicable access provisions are to be ticked.
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GUIDANCE FOR UNDERGOING CLASS MAINTENANCE SURVEYS
History of bulk cargoes of corrosive nature (e.g. high sulphur content) Carried SULPHUR UN 1350 in year 2002 or 2003
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GUIDANCE FOR UNDERGOING CLASS MAINTENANCE SURVEYS
Owner’s inspections Using a format similar to that of the table below (which is given as an example), the owner should provide details of the results of their inspections, for the last 3 years on all cargo holds and ballast tanks and void spaces within the cargo area, including peak tanks. Table SPQ2 Hold or Tank No. Cargo holds No.1 C/H No.2 C/H No.3 C/H No.4 C/H No.5 C/H No.6 C/H No.7 C/H
Ballast tanks Aft peak No.1 TST(P/S) No.2 TST(P?S) No.3 TST(P/S) No.4 TST(P/S) No.5 TST(P/S) No.1 BHT(P/S) No.2 BHT(P/S) No.3 BHT(P/S) No.4 BHT(P/S) No.5 BHT(P/S) Fore peak
Corrosion protection (1)
Coating extent (2)
Coating condition (3)
Structural deterioration (4)
HC HC HC HC HC HC HC
U, M U, M U, M U, M U, M U, M U, M
F F F P P F F
N N Y Y Y Y N
HC, A HC, A HC, A HC, A HC, A HC, A HC, A HC, A HC, A HC, A HC, A HC, A
C C C C C C C C C C C C
G F F F F F F F F F F F, RC
N N N Y Y Y Y N N N N Y
Miscellaneous spaces
Note: Indicate tanks which are used for oil/ballast 1) HC=hard coating; SC=soft coating; A=anodes; NP=no protection; 2) U=upper part; M=middle part; L=lower part; C=complete 3) G=good; F=fair; P=poor; RC=recoated (during the last 3 years) 4) N= no findings recorded; Y= findings recorded, description of findings is to be attached to the questionnaire 5) DR=damage & repair; L= Leakages; CV= Conversion (description should be attached to this questionnaire)
Name of owner’s representative: NK Shippng Signature: Date:
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Alex N.K.
10 October 2006
Hold and Tank damage history (5)
DR
GUIDANCE FOR UNDERGOING CLASS MAINTENANCE SURVEYS
Reports of Port State Control inspections List the reports of Port State Control inspections containing hull structural related deficiencies and relevant information on the rectification of the deficiencies: Nil.
Safety Management System List non-conformities related to hull maintenance, including the associated corrective actions: Nil.
Name and address of the approved thickness measurement company:
NK TM co.
Other information: Nil.
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Appendix 3.1 – Overall Survey Requirements Overall survey requirements for Special Survey No.1 1. 2. 3. 4. 5. 6.
Cargo holds (see note 1) Cofferdams Ballast tanks (see note 2) Cargo tanks (other than those of tankers, ships carrying liquefied gases in bulk and ships carrying dangerous chemicals in bulk) Peak tanks Machinery spaces and other spaces Overall survey requirements for Special Survey No.2 (see note 3)
1. 2. 3.
Tanks and spaces subject to examination carried out at Special Survey No.1 Fresh water tanks Fuel oil tanks in cargo areas for tankers or in cargo length areas for other ships Overall survey requirements for Special Survey No.3
1. 2.
Tanks and spaces subject to examination carried out at Special Survey No.2 Fuel oil tanks (see note 4) Overall survey requirements for Special Survey No.4 and subsequent Special Surveys
1. 2.
Tanks and spaces subject to examination carried out at Special Survey No. 3 (see note 5) Lubricating oil tanks (see note 6) Additional requirements of overall survey for All Special Surveys
All ballast tanks (see note 7), and all tanks and spaces adjacent to cargo holds (pipe tunnels, cofferdams and void spaces (see note 8)) Notes: 1
For holds insulated for the carriage of refrigerated cargo, the limber boards and the cover plates are to be removed and an examination of the inside is to be carried out. In addition, an examination behind the insulation is to be carried out at representative locations. The examination may be limited to verification that the protective coating remains effective and that there are no visible structural defects. Where POOR coating condition is found, the examination is to be extended as deemed necessary by the Surveyor.
2
Ballast tanks (excluding double bottom tanks) where the protective coating is found in poor condition and it is not renewed or where a protective coating has not been applied, internal examinations are to be carried out at annual intervals. For double bottom ballast tanks in this condition, internal examinations are to be carried out at annual intervals where considered necessary by the Surveyor.
3
If fresh water tanks and fuel oil tanks have had external examinations and the Surveyor is satisfied that they are in good condition, the scope of any internal examinations may be reduced to just one selected tank respectively. Notwithstanding the above, peak tanks are to be subject to internal examinations at each Special Survey.
4
For fuel oil tanks: (1) If fuel oil tanks in cargo areas for tankers or in cargo length areas for other ships have had external
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examinations and the Surveyor is satisfied that they are in good condition, the scope of any internal examinations may be reduced to just two selected tanks. In cases where deep fuel oil tanks are provided, one or more deep tanks are to be included in this scope. (2) If fuel oil tanks other than those mentioned in (1) have had external examinations and the Surveyor is satisfied that they are in good condition, the scope of any internal examinations may be reduced to just one tank selected from those in engine rooms. Notwithstanding the above, peak tanks are to be subject to internal examinations at each Special Survey. 5
For fuel oil tanks: (1) If fuel oil tanks in cargo areas for tankers or in cargo length areas for other ships have had external examinations and the Surveyor is satisfied that they are in good condition, the scope of any internal examinations may be reduced to half of the selected tanks, but not less than two tanks. In cases where deep fuel oil tanks are provided, one or more deep tanks are to be included in this scope. (2) If fuel oil tanks other than those mentioned in (1) have had external examinations and the Surveyor is satisfied that they are in good condition, the scope of any internal examinations may be reduced to just one tank selected from those in engine rooms. Notwithstanding the above, peak tanks are to be subject to internal examinations at each Special Survey.
6
If lubricating oil tanks have had external examinations and the Surveyor is satisfied that they are in good condition, the scope of any internal examinations may be reduced to just one selected tank. Notwithstanding the above, peak tanks are to be subject to internal examinations at each Special Survey.
7
For ballast tanks, excluding double bottom tanks, where the protective coating is found in poor condition, and is not renewed or where a protective coating has not been applied from the time of construction, an internal examination is to be carried out at annual intervals. For ballast double bottom tanks in this condition, an internal examination is to be carried out at annual intervals where considered necessary by the Surveyor.
8
Ballast tanks converted to void spaces are to be examined applying the provisions for ballast tanks.
9
If a selection of tanks is accepted to be examined, then different tanks are to be selected so as to examine all tanks on a rotational basis.
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Appendix 3.2 – Close up Survey Requirements Close-up survey requirements for Special Survey No.1 1. A sufficient number (at least 1/4 of the total number) of shell frames at the forward, middle, and aft parts on both sides of forward cargo holds and selected frames in remaining cargo holds (A) 2. Two selected cargo hold transverse bulkheads and lower part of remaining transverse bulkheads (including stiffeners and girders) (C) 3. One transverse web with associated plating and longitudinals in two representative ballast tanks of each type (topside or bilge hopper tank) (B) 4. Air pipes and sounding pipes in cargo holds in way of tank top 5. All hatch cover plating, hatch coaming plating, and stiffeners
Close-up survey requirements for Special Survey No.2 1. All shell frames in forward cargo hold and a sufficient number (at least 1/4 of the total number for ships less than 100,000 DWT and at least 1/2 of the total number for ships of 100,000 DWT or more) of shell frames in each of the remaining cargo holds including their end attachments and adjacent shell plating (A) 2. All transverse bulkheads (including stiffeners and girders) in all cargo holds (C) 3. One transverse web with associated plating and longitudinals in each ballast tanks (B) 4. Both forward and aft transverse bulkheads (including stiffeners and girders) in one ballast tank (B) 5. All deck plating and under deck structure inside the line of hatch openings between cargo hold hatches 6. All piping arrangements in cargo holds. If the surveyor considers it necessary, airtight tests are to be carried out. 7. All hatch cover plating, hatch coaming plating, and stiffeners
Close-up survey requirements for Special Survey No.3 1. All shell frames in the forward and one other selected cargo holds and a sufficient number (at least 1/2 of the total number) of shell frames in each of the remaining cargo holds including their end attachments and adjacent shell plating (A) 2. All transverse bulkheads (including stiffeners and girders) in all cargo holds (C) 3. All transverse webs with associated plating and longitudinals and all transverse bulkheads (including stiffeners and girders) in each ballast tank (B) 4. Structural members specified in 5. to 7. of Special Survey No.2 above
Close-up survey requirements for Special Survey No.4 and subsequent Special Surveys 1.All shell frames in all cargo holds including their end attachments and adjacent shell plating (A) 2. Structural members specified in 2. to 4. of Special Survey No.3 above Notes: 1
Letters in this table mean: (A): Cargo hold transverse frames, or stiffeners on side shell or longitudinal bulkhead in double side tanks (B): Transverse web frame ring or watertight transverse bulkhead in fore and aft peak, topside, bilge hopper and double side ballast tanks including adjacent structural members (C): Including plating and internal structures of lower and upper stools, where fitted
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2
Close-up Surveys of transverse bulkheads are to be carried out at least at four levels as specified as follows: (i)
Immediately above the inner bottom and immediately above the line of gussets (if fitted) and shedders for ships without lower stool.
(ii) Immediately above and below the lower stool shelf plate (for those ships fitted with lower stools), and immediately above the line of the shedder plates. (iii) About mid-height of the bulkhead. (iv) Immediately below the upper deck plating and immediately adjacent to the upper wing tank, and immediately below the upper stool shelf plate for those ships fitted with upper stools, or immediately below the topside tanks. *1: For bulk carriers with hybrid cargo hold arrangements, that is, with some cargo holds of single side skin and others of double side skin, the Requirements for Double Skin Bulk Carriers are to apply to cargo holds of double side skin and associated wing spaces.
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Appendix 3.3 – Tank Testing Requirements Tank testing requirements for All Special Surveys 1. 2. 3. 4. 5.
All boundaries of ballast tanks, deep tanks and cargo holds used for ballast within the cargo length area Representative fuel oil tanks within the cargo length area. When deemed appropriate by the Society, pressure tests may be specially considered. All water tanks. Pressure tests of fresh water tanks may be specially considered when deemed appropriate by the Society. All fuel oil tanks outside the cargo length area. Pressure tests may be specially considered when deemed appropriate by the Society. All lubrication oil tanks. Pressure tests may be specially considered when deemed appropriate by the Society.
Notes: 1
A pressure test is to be carried out under the pressure specified below: (a) For tanks: the pressure corresponding to the maximum head that can be experienced in service (b) For piping: the working pressure
2
A pressure test of tanks may be carried out when the ship is afloat, provided that an internal examination of the
3
For ships having many water tanks and oil tanks, some of the tanks may be exempted from a pressure test where
bottoms of the tanks has also been carried out while afloat. deemed appropriate by the Surveyor taking into account the ship’s present condition, age and interval from the previous test. 4
Any testing of double bottom tanks and other watertight compartments not designed to carry liquids may be omitted, provided that satisfactory internal and/or external examinations are carried out.
5
Bilge, sludge and other similar tanks are to comply with the requirements for fresh water tanks
6
Pressure tests of air pipes, sounding pipes, and other pipes may be required where deemed necessary by the
7
“In cases where deemed appropriate by the Society” means that satisfactory external examinations of tank
Surveyor as a result of examinations. boundaries and confirmations from Masters stating that all pressure testing has been carried out according to the requirements with satisfactory results.
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Appendix 3.4 – Thickness Measurement (hereinafter, TM) Requirements TM Requirements for Special Survey No.1 1. 2.
Suspect areas At least structural members subject to close-up survey for general assessment and recording of corrosion pattern
TM Requirements for Special Survey No.2 1. 2.
3. 4. 5.
Suspect areas Structural members within the cargo length area: (1) Two transverse sections of deck plating, outside the line of cargo hatch openings (2) All strength deck plating, where log cargoes or other cargoes that are prone to accelerate corrosion are loaded At least structural members subject to close-up survey for general assessment and recording of corrosion pattern Wind and water strakes in way of the transverse sections of 2.(1) above Selected wind and water strakes outside the cargo length area
TM Requirements for Special Survey No.3 1. 2.
3. 4. 5. 6.
Suspect areas Structural members within the cargo length area: (1) Each deck plating outside the line of cargo hatch openings (2) Two transverse sections, one in the midship area, outside the line of cargo hatch openings. When the selected section is a transversely framed section, adjacent frames and their end connections in way of the transverse section are to be included. At least structural members subject to close-up survey for general assessment and recording of corrosion pattern Internals in fore and aft peak tanks All wind and water strakes within the cargo length area Selected wind and water strakes outside the cargo length area
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TM Requirements for Special Survey No.4 and subsequent Special Surveys 1. 2.
3. 4. 5. 6. 7. 8. 9.
Suspect areas Structural members within the cargo length area: (1) Each deck plating outside the line of cargo hatch openings (2) Three transverse sections, one in the midship area, outside the line of cargo hatch openings. When the selected section is a transversely framed section, adjacent frames and their end connections in way of the transverse section are to be included. (3) Each bottom plate At least structural members subject to close-up survey for general assessment and recording of corrosion pattern Internals in fore and after peak tanks All exposed main deck plating outside the cargo length area Representative exposed superstructure deck plating (poop, bridge and forecastle deck) All keel plates, full length, and an appropriate number of bottom plates in way of cofferdams, machinery space, and aft end of tanks Plating of sea chests, and shell plating in way of overboard discharges (as deemed necessary by the Surveyor) All wind and water strakes
Notes: 1
The surveyor may extend the thickness measurements as deemed necessary.
2
Where substantial corrosion is found, the extent of thickness measurements should be increased accordingly.
3
Transverse sections are to be chosen where the largest reductions are suspected to occur or are revealed from deck plating measurements. Where two or more transverse sections are required to be measured, one of them, at least, is to be a part of the water ballast tanks arranged just below upper deck within 0.5L amidships.
4
As for thickness measurements on frames and brackets, the measuring points are to be generally within 30 mm from fillet welding with shell or slant plates.
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Appendix 3.5 - The Wastage Allowance (1) Principal structural hull members (i) The wastage allowance (diminution limits) for plates and stiffeners are shown in the following table. (ii) The wastage allowance for longitudinal strength members given in the following table are based on the condition that the diminution limit of longitudinal strength of the hull has not been reached. (iii) The values of the wastage allowance indicate limit values in case of uniform wear of members. (iv) Notwithstanding the following table, the wastage allowance for local corrosion such as stress corrosion and pitting are to be decided at the discretion of the Surveyor. The standard diminution limit for local corrosion other than stress corrosion is to be taken as 40% of the original thickness. (v)
Notwithstanding the following table, the wastage allowance for the ships subject to the retroactive requirements for existing bulk carrier is to be assessed ship by ship.
Structural Member - Shell plates - Strength deck plates - Longitudinal beams (flat bar) on shear strake and strength deck - Tight bulkheads in deep tanks*1 - Inner bottom plates - Floors and girders in double bottom - Primary members (web & face) - Web, face and bracket of hold frames - Watertight bulkhead plates - Web and face of frames (excluding hold frames), longls beams, stiffeners and brackets - Effective deck plates - Hatch cover and hatch beam
Wastage Allowance 20% of original thickness + 1 mm
25% of original thickness
30% of original thickness
*1 The deep tank is a tank used for carriage of water, oil and other liquids, forming a part of the hull in holds or tween decks.
(2) Minimum thickness for high tensile steel members If high-tensile steel is used in bottom longitudinals of tankers with a single bottom construction, the wear and tear limit of the web is taken as 25% of the original thickness. If high-tensile steel is used in other structural members, the wear and tear limit is to be in accordance with (1) and (2) above. (3) Measure against corrosion When remarkable corrosion is found in the results of thickness measurement, the Surveyor should examine the pattern and extent of the corrosion through intensive inspection or thickness measurement and take a necessary measure such as (i) & (ii) below. Where substantial corrosion is found, the additional thickness measurement is required. Substantial corrosion is an extent of corrosion such that assessment of corrosion pattern indicates a wastage in excess of 75% of allowable margins, but within acceptable limits. (i) Corrosion exceeding acceptable limit The Surveyor should require repair such as renewal of the corroded plate exceeding acceptable limit. However, special consideration may be given for structural members whose actual scantling surpasses much the Rule requirements. (ii) Substantial corrosion - 177 -
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Necessary instruction for further inspection of corrosion which does not exceed acceptable limit, but where continuous monitoring is deemed necessary should be given. Substantial corrosion in excess of 75% of allowable margin is to be nominated as suspect area and thickness measurement and necessary inspections of the area is to be carried out at subsequent Survey (Annual, Intermediate and Special Survey). (4) Structural members stipulated in 1.3.1(6), Part B of the Rules (Note) (Note) : The ships having subject members, the survey status shows description in Special Attention for Surveys as follows “T NET” CONCEPT APPLIED TO THE FOLLOWING MEMBERS (a) The diminution limit for transverse bulkhead plates in cargo holds, to which the ”t net” concept applied, is given by the following formula. The values of the diminution limit indicate limit values in case of uniform wear of members. t renewal (diminution limit)= t as built – 3.0 (mm) t as built : as built thickness (b) The diminution limit for hatch cover and hatch coaming of bulk carriers, to which the ”t net” concept applied, is given by the following formula. The values of the diminution limit indicate limit values in case of uniform wear of members. t renewal (diminution limit)= t as built – t c + 0.5 (mm) t as built : as built thickness t c: Corrosion addition specified in Table 0305-c1 Table 0305-c1 Structural Member Corrosion addition t c（mm） Type of structure For the top, side and For the internal Steel Hatch bottom plating structures Cover Single plating type 2.0 Double plating type 2.0 1.5 Hatch Coaming 1.5 (c) The diminution limit for hatch cover and hatch coaming of ships other than bulk carriers, to which the ”t net”concept applied, is given by the following formula. The values of the diminution limit indicate limit values in case of uniform wear of members. t renewal (diminution limit)= t as built – t c + 0.5 (mm) t as built : as built thickness t c: Corrosion addition specified in Table 0305-c2 In case of corrosion addition is 1.0 (mm), renewal thickness may be given by the formula of t renewal = t as built – t c (mm) Table 0305-c2 Structural Member Corrosion addition t c（mm） Type of structure For the top, side and For the internal Steel bottom plating structures Hatch Single plating type 2.0 (1.0 for the container carrier) Cover Double plating type 1.5 1.0 Hatch Coaming
(1.0 for the container carrier)
1.5
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Appendix 3.6 - Interpretations of rule requirements for the number and location of thickness measurements for CSR bulk carriers Reference
Item
Interpretation
Selected plates on deck, tank top, bottom, double bottom and wind-and- water area
«Selected» means at least a single point on one out of three plates, to be chosen as representative areas of average corrosion
All deck, tank top and bottom plates and wind-and-water strakes
At least two points on each plate to be taken either at each 1/4 extremity of plate or at representative areas of average corrosion
Transverse section
Single side skin construction: A transverse section includes all longitudinal members (i.e., plating, longitudinals and girders, etc.) at the deck, side, bottom; inner bottom and hopper side plating and bottom plating in top wing tanks. Double side skin construction: A transverse section includes all longitudinal members (i.e., plating, longitudinals and girders, etc.) at the deck, sides, bottom, inner bottom, hopper sides, inner sides and top wing inner sides.
Fig (A)
All cargo hold hatch covers and coamings
Including plates and stiffeners
Fig. (B)
Transverse section of deck plating outside line of cargo hatch openings
Two single points on each deck plate (to be taken either at each 1/4 extremity of the plate or at representative areas of average corrosion) between the ship sides and hatch coamings in the concerned transverse section
All deck plating and underdeck structure inside line of hatch openings between cargo hold hatches
«All deck plating» means at least two points on each plate to be taken either at each 1/4 extremity of the plate or at representative areas of average corrosion. “Under deck structure”: at each short longitudinal girder: three points for web plating (fwd/middle/aft), one point for face plate, one point for web plating and one point for face plating of transverse beams in way. At each end of transverse beams, one point for web plating and one point for face plate
Fig. (F)
Selected side shell frames in cargo of single side skin holds construction
Includes side shell frames, upper and lower end attachments and adjacent shell plating. • 25% of frames: one out of four frames should preferably be chosen throughout the cargo hold length on each side. • 50% of frames: one out of two frames should preferably be chosen throughout the cargo hold length on each side. «Selected frames» means at least 3 frames on each side of cargo holds
Fig. (C)
Transverse frame in double skin tank of double side skin construction
---
Fig. (A)
Transverse bulkheads in cargo holds
Includes bulkhead plating, stiffeners and girders. Also includes internal structures of upper and lower stools, where fitted. Two selected bulkheads: one is to be the bulkhead between the two foremost cargo holds and the second may be chosen in another position
Fig. (D)
One transverse bulkhead in each cargo hold
This means that close-up surveys and related thickness measurements are to be performed on one side of the bulkhead; the side is to be chosen based on the outcome of the overall survey of both sides. In the event of doubt, the Surveyor may also require (possibly partial) close-up surveys on the other side
Fig. (D)
Transverse bulkheads in one topside, hopper, double bottom ballast tank and side ballast tank(double side skin)
Includes bulkhead and stiffening systems. The ballast tank is to be chosen based on the history of ballasting among those prone to have the most severe conditions
Fig. (E)
Transverse webs in ballast tanks
Includes web plating, face plates, stiffeners and associated plating and longitudinals. One of representative tanks of each type (i.e. topside or hopper or side tank) is to be chosen for in the forward part
Fig. (A) Fig. (C)
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Fig. (A) Example of locations subject to thickness measurements in transverse sections (bulk carriers)
Note: Measurements are to be taken for both the port and starboard sides of the selected transverse section.
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Fig. (B) Example of locations subject to thickness measurements on hatch covers and hatch coamings (bulk carriers)
Notes: 1. Three sections at L/4, L/2, 3L/4 of hatch cover length, including: • one measurement of each hatch cover plate and skirt plate • measurements of adjacent beams and stiffeners • one measurement of coaming plates and coaming flanges, for each side 2. Measurements of both ends of hatch cover skirt plates, coaming plates and coaming flanges 3. One measurement (two points for web plates and one point for face plates) of one out of three hatch coaming brackets and bars, on both sides and both ends
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Fig. (C) Example of locations subject to thickness measurements in cargo holds and water ballast tanks (single side skin bulk carriers)
Note: The gauging pattern for web plates is to be a three point pattern for zones A, C and D, and a two point pattern for zone B (see figure). The gauging report is to reflect the average reading. The average reading is to be compared with the allowable thickness. If the web plate has general corrosion then this pattern is to be expanded to a five-point pattern.
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Fig. (D) Example of locations subject to thickness measurements on cargo hold transverse bulkheads (bulk carriers)
Note: Measurements are to be taken in each shaded area as shown in A-A and B-B
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Fig. (E) Example of locations subject to thickness measurements on transverse bulkheads of topside, hopper, double hull and double bottom tanks (bulk carriers)
Note: Measurements are to be taken in each shaded area as shown in A-A and B-B
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Fig. (F) Example of locations subject to thickness measurements on underdeck structures (bulk carriers)
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Appendix 6 Procedure and Guidance to prevention of accidents during surveys Appendix 6-1 IACS Recommendation No.72
No. 72
(2000) Rev.1 (October 2003) Rev.2 (April 2007)
IACS
CONFINED SPACE SAFE PRACTICE
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Contents 1. Definitions 1.1 Confined Space 1.2 Competent person 1.3 Responsible person 1.4 Marine Chemist
2. General Hazards 3. Confined space – Safe entry policy 3.1 General 3.2 Entering confined spaces adjacent to loaded tanks 3.3 Entering confined spaces adjacent to inerted tanks
4. Confined space - Safe entry procedure 4.1 General 4.2 Entering confined spaces adjacent to loaded tanks on double hull tankers – additional requirements
5. Permit-to-work and permit-to-enter 6. Testing of the atmosphere 6.1 General 6.2 Testing for oxygen 6.3 Testing for flammable atmosphere 6.4 Testing for toxic atmospheres 6.5 Testing instruments
7. Preparation for Entering Confined Spaces 7.1 Ventilation 7.2 Isolation of Space 7.3 Standby / rescue
8. Personal Protection Equipment (PPE) ANNEX Guidelines for safe entry of Confined Spaces
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Confined Spaces Safe Practice 1 Definitions 1.1 Confined Space Confined space means a space that has any of the following characteristics: — limited openings for entry and exit; — unfavourable natural ventilation; — not designed for continuous worker occupancy. It includes, but is not limited to, boilers, pressure vessels, cargo holds, cargo tanks, ballast tanks, double bottoms, double hull spaces, fuel oil, lube oil, sewage-tanks, pump-rooms, compressor rooms, cofferdams, void spaces, duct keels, inter-barrier spaces and engine crankcases.
1.2 Competent person Competent person means a person with sufficient theoretical knowledge and practical experience to make an informal assessment of the likelihood of a dangerous atmosphere being present or subsequently arising in the space.
1.3 Responsible person Responsible person means a person authorised to permit entry to a confined space and having sufficient knowledge of the procedure to be followed.
1.4 Marine Chemist A Marine Chemist is a person who possesses a current Marine Chemist Certificate issued by the National Fire Protection Association (NFPA 306: Control of Gas Hazards on Vessel Sections) or equivalent.
2 General Hazards Work in confined and enclosed space has a greater likelihood of causing fatalities, severe injuries and illness than any other type of shipyard work or onboard ships. The key hazards associated with confined spaces are: — serious risk of fire or explosion; — loss of consciousness from asphyxiation arising from gas, fumes, vapour or lack of oxygen; — drowning arising from increased water level; — loss of consciousness arising from an increase in body temperature; — asphyxiation/suffocation arising from free flowing solid (engulfment) or the inability to reach a breathable atmosphere due to entrapment. Surveyors will routinely enter confined spaces that are difficult to access due to small and/or narrow openings. There may be physical constraints within the space which need to be considered, and the space itself may be cramped permitting only restricted mobility. Given the usual enclosed and darkened nature of a confined space this activity ideally should not be carried out by personnel suffering from phobias (e.g. claustrophobia) or who are susceptible to panic or anxiety attacks. For further details regarding hazards in confined spaces see Annex, section 2, Confined Space Hazards.
3 Confined space – Safe entry policy 3.1 General When requested to enter a confined space: Only enter a confined space when a permit to enter has been issued and if you consider it is safe to do so, and then only remain in the inside for as long as it is necessary to carry out the work.
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It is the full responsibility of the owner of the confined space (i.e. ship, shipyard) to make and ensure that the confined space is safe to enter. — The surveyor has the right to refuse to enter an unsafe and/or unknown space. — If he/she is not confident that a space is safe, he/she should report his concerns and not enter until all safety requirements are met. The surveyor shall not enter a space that requires use of a respirator. The surveyor may wear a respirator or escape pack if required by an Owner’s policy and only if sufficiently trained in the use of such equipment, BUT the space MUST be safe first.
Note: - Do not enter a space first or alone! - If in doubt - do not enter - no survey is worth risking life or health for. 3.2 Entering confined spaces adjacent to loaded tanks It is important to be aware that confined spaces may be, or have been, subject to leakage from the adjacent space. The risk is that such leakage often remains undetected because the space is not subject to regular gas measurements and ventilation. Confined spaces adjacent to loaded tanks may be entered provided the procedure for entry as given in item 4 below is completed. Spaces adjacent to cargo tanks, like cofferdams and double bottom tanks, may contain accumulated residues from previous cargoes and information about these cargoes is needed to determine proper test methods for the atmosphere in the adjacent spaces. If a tank is loaded with cargoes having a toxic vapour hazard identified by an entry T in column K of the IBC Code Ch.17, or with a toxic symbol in the Data Sheet, no survey is to be carried out in a confined space adjacent to that tank. Be aware that toxicants produced by work (like coating, sandblasting and hydro blasting) in the area of a confined space can enter and accumulate in the confined space.
3.3 Entering confined spaces adjacent to inerted tanks When other tanks in an inert condition are either adjacent or interconnected (e.g. pipeline) to the space to be entered, personnel should be alert to the possibility of inert gas leaking into that space through, for example, bulkhead fractures or defective valves. The risk of this occurring can be minimized by maintaining a small but positive pressure in the space to be entered relative to the inert gas pressure. At all times the procedures on the vessel are to be followed.
4 Confined space - Safe entry procedure 4.1 General Prior to entry into an enclosed space or tank the following procedure should be applied: a) A Safety meeting should be held prior to the survey to discuss all aspects of safety measures including at least all items below. b) Entry Permit should be obtained for the space to be entered. See item 5 below. c) Identify the hazards and assess the risks. d) In order to be able to identify the hazards in the space to be surveyed and assess the risks, the following information should be available: − Latest content of the spaces to be surveyed should be identified and the content in spaces adjacent to them. − For Gas Carriers: a data sheet for the last cargo should be presented. − For Chemical Tankers: a data sheet for the previous three cargoes should be presented.
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It is the Owner’s responsibility to provide this information. e) Evaluate ventilation of the space: − Check that the tank or enclosed space is empty, cleaned and ventilated. The Owner is obliged to document that this is carried out. See also item 7.1 below. f) Evaluate need for isolation of the space. See item 7.2. below. g) Ensure that a standby and/or rescue team is in place. See item 7.3 below. h) Check and evaluate gas measurements taken. For testing and limit values see item 6 below: − as a minimum, oxygen measurements should be carried out before entry into the enclosed space. When found necessary the measurements should be taken under the supervision of the surveyor. − in addition a set of additional control measures should be evaluated depending on what kind of tank is to be surveyed. See Annex, Checklist for Entry into Confined Spaces. The surveyor should always use his personal gas measuring equipment during the survey. i) Evaluate need for precaution against extreme temperature. See Annex, section 6.1, Temperature extremes. j) Evaluate the lighting arrangement. See Annex, section 8.2, Lighting. k) Evaluate if special clothing and/or equipment are required. A checklist with the items above is recommended to be used for evaluation if the space is safe to enter. If extensive work is to be carried out within a large space, such as a cargo tank, it is recommended that a full assessment of the tank atmosphere is undertaken after the initial tests have been satisfactorily carried out and recorded. The tank atmosphere should be checked frequently during this entry, with particular attention being placed on testing the work location(s) and places that are inaccessible for testing from the deck. On satisfactory completion of this additional atmosphere test, the results should be recorded as required by the appropriate safety procedure in the Safety Management System.
4.2 Entering confined spaces adjacent to loaded tanks on double hull tankers – additional requirements The compartmentalized structure in double hull and double bottom tanks makes them more difficult to gas free than conventional tanks and particular care should be taken to monitor the tank atmosphere. Although entry into double hull or double bottom tanks with adjacent tanks loaded should be kept to a minimum, tank entry will on occasion be required for such purpose as tank inspections. In relation to the entry procedure above, the following additional recommendations should be strictly enforced. Once the tank atmosphere meets the entry criteria at each sampling point, actual entry by personnel should be undertaken in two stages. First stage The first stage should be for the purpose of atmosphere verification and a general safety review. The personnel making the entry should be equipped with: −
an emergency escape breathing set,
−
personal gas detector capable of monitoring at least hydrocarbon and oxygen,
−
portable radio,
−
emergency light source,
−
a retrieval harness,
−
an alternative means of attracting attention, e.g. a whistle.
Second stage Only after the first stage has verified that the atmosphere throughout the tanks is safe for the intended task should entry for other purpose be permitted.
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5 Permit-to-work and permit-to-enter The ISM code requires the Company to establish safe practices in ship operation and a safe working environment. This is commonly provided for by a permit-to-work system that is drawn up to provide a formal written safety control system. MOU and FPSO units not covered by ISM code have a similar permit-to-work system. A permit-to-work will: — set out the work to be done, the location and the precautions to be taken; — predetermine safe methods of work; — provide a clear record that all foreseeable risks have been considered; — define the precautions to be taken and their sequence; — provide written authority for the confined space to be entered and the work to start and the time when the work must cease. Entry into a confined space should only be allowed when a separate permit-to-enter has been issued. This permit should only be issued after tests have taken place to ensure that the atmosphere is safe to breathe.
Note: Use of non-explosion proof equipment like cameras, torches, chipping hammers, may be allowed provided that it is stated in the Entry permit issued and the space is safe for hot work or safe for workers and LEL is measured to 0%. 6 Testing of the atmosphere 6.1 General Initial testing should be carried out by a certified “Marine Chemist” or a “Competent person” or similar accredited person who will issue a certificate stating whether the space is ‘safe for man’ and/or work, and if any special conditions are to be observed. On a vessel this may be the Chief Officer, or other competent person onboard. If in doubt of the officer’s qualification, documentation is required to be shown. In no case should the class surveyor be considered to be a “Competent Person” – even if he is equipped with his own personal testing equipment. Ventilation should be stopped about 10 minutes before tests are made and not restarted until the tests are completed. The testing should be carried out in the following sequence • Oxygen-deficient or -enriched atmospheres • Flammable atmospheres • Toxic atmospheres when considered necessary To evaluate the measurements taken, the following limit values should be used.
6.2 Testing for oxygen Any atmosphere with less than 20.8% (± 0.2%) oxygen by volume should not be entered. Oxygen measurements should be carried out by, or under supervision of, the surveyor immediately before entry into the confined space.
6.3 Testing for flammable atmosphere A space with an atmosphere with more than 1% of the “Lower Flammable Limit” (LFL) or “Lower Explosive Limit” (LEL), on a combustible gas indicator should not be entered. The Flammability indicator shows the percent within a safety range of 0-10% of the Lower Explosive Limit (LEL) and, ideally, should read 0%. Combustible gas detectors have normally two measuring ranges 0-100% LEL and 0-10% LEL.
6.4 Testing for toxic atmospheres Toxins are measured in parts per million (PPM). Under no circumstances should the surveyor enter a confined space exceeding the limits specified below. Different testing bodies throughout the world may, however, have different acceptance limits.
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Gas
Limit 8 Hour work shift [ppm]
Limit 15 min working [ppm]
Benzene (C6H6)
1
5
Hydrogen Sulphide (H2S)
5
20
Carbon Dioxide (CO2)
5
30
Carbon Monoxide (CO)
25
50
Nitrogen Dioxide (NO2)
1
3
Nitrogen Monoxide (NO)
25
50
Sulphur Dioxide (SO2)
2
5
For vessels with inert gas systems, trace amounts of various toxic gases may increase the hazard of exposure for personnel. Normally, a steady 21% by volume of oxygen reading will be sufficient to dilute these gases to below their “Threshold Limit Value” (TLV).
Note: Never trust one’s own senses to determine if the air in a confined space is safe! Many toxic gases and vapours can neither be seen nor smelled, nor can the level of oxygen present be determined. Be aware that some chemicals have a lower TLV value than odour value. Gases from these substances will not be traceable by smell before they are dangerous to health.
6.5 Testing instruments For further details, see Annex, section 8, Personal Protection Equipment (PPE), and section 3.2, Testing Instruments.
Note: — When Draeger tube or equal is used for detecting toxic gases the sampling gas should have sufficient time to pass through the sampling hose. — If manual hand rubber pump is used, approx. 4 squeezes are needed for each metre of the sampling hose. — If battery driven pumps are used, approx. 10 sec. for each metre of sampling hose should be sufficient. 7 Preparation for Entering Confined Spaces 7.1 Ventilation
Ventilation should be continuous where possible because in many confined spaces the hazardous atmosphere will form again when the flow of air is stopped. All openings are to be opened for ventilation including emergency exit. De-ballasting a tank does not guarantee a safe atmosphere. Testing of the atmosphere is still required. The inert gas fans should not be used to provide fresh air ventilation because contaminants from the inert gas lines could be introduced into the tanks. For further details, see Annex, section 4, Ventilation.
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7.2 Isolation of Space The surveyor should evaluate the need for isolation of the confined space from service before entering the space. The surveyor should not enter or remain in any ballast or cargo tank if ballast is transferred into or out of any tank, if not agreed beforehand. For further details regarding isolation of spaces from service, see Annex, section 5, Isolation of space.
7.3 Standby / rescue Standby A standby person should be assigned to remain on the outside of the confined space and be in constant contact (visual or two-way voice communication e.g. walkie-talkie) with the survey team inside. Routines for communication intervals with the survey team should be established. The standby person: — should not have any other duties than to serve as standby and know who should be notified in case of emergency; — should never leave his post even after help has arrived and is a key communication link to others onboard; — should be able to communicate sufficiently in a relevant common language.
Communication between watch personnel (Bridge, Cargo Control Room or Engine Control Room) and standby person should be established. Rescue Rescuers must be trained in and follow established emergency procedures and use appropriate equipment and techniques (such as lifelines, respiratory protection, standby persons). Emergency and evacuation procedures should be agreed and understood by all parties involved in a potential rescue operation. Steps for safe rescue should be included in all confined space entry procedures. Rescue should be well planned and evidence should be made available that indicates drills have been frequently conducted on emergency procedures.
Note: Unplanned rescue, such as when someone instinctively rushes in to help a downed co-worker, can easily result in a double fatality or even multiple fatalities if there is more than one would-be rescuer. Over 50% of the workers in confined spaces die while attempting to rescue other workers. An unplanned rescue could be the last! 8 Personal Protection Equipment (PPE)
PPE is traditionally regarded as the last line of protection with the emphasis being placed on avoidance and appropriate managerial control methods. However, the potentially hazardous nature and isolated position of those entering a confined space means that, for the surveyor, PPE may be the first line of protection. Each confined space will present different hazards and degrees of risk to health and safety, the final provision of PPE should therefore be based on an assessment of risk. As a general rule the following guidance is offered. Basic surveyor PPE should include: − Body protection (hard wearing overalls with suitable pockets for notebook, etc); − Foot protection (steel toecaps (200 joules), steel midsoles, good grip, oil resistant); − Head protection (hard hat with chinstraps); − Hand protection (hard wearing gloves); − Eye protection (protective glasses, goggles);
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− Ear protection (ear defenders or ear plugs – worn subject to communication system); − Gas meter - multi-gas meter for measuring of HC, H2S, CO, O2 is recommended; − Lighting (hand held with lanyard and appropriate beam width).
Reference List ISGOTT International Safety Guide for Oil Tankers and Terminals, fifth edition. Tanker Safety Guide Chemicals, third edition Tanker Safety Guide Liquid Gas, second edition 1995 OCIMF - Health, Safety and Environment at New-building and Repair Shipyards and During Factory acceptance testing (01 July 2003) IACS Recommendation No. 39 - Safe use of Rafts or Boats for Survey
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Annex to Recommendation 72 Guidelines for Safe Entry of Confined Spaces 1 General If a Survey is required to be carried out in a: − − − − − − − − −
boiler or pressure vessel, cargo tank, ballast tank, double hull space, fuel oil tank, lube oil tank, cargo hold, void space, or similar type of enclosure,
the work will take place in a confined space. How to Identify a Confined Space? A confined space is a space that has any one of the following characteristics: — limited openings for entry and exit; — unfavourable natural ventilation; — not designed for continuous worker occupancy.
Limited openings for entry and exit: Confined space openings are limited primarily by size or location. Openings are usually small in size, perhaps as small as 450mm (18 inches) in diameter, and are difficult to move through easily. Small openings may make it very difficult to get needed equipment in or out of the spaces, especially life-saving equipment when rescue is needed. However, in some cases openings may be very large, for example open-topped spaces such as ships’ holds. Access to open-topped spaces may require the use of ladders, hoists, or other devices, and escape from such areas may be very difficult in emergency situations. Unfavourable natural ventilation: Because air may not move in and out of confined spaces freely due to the design, the atmosphere inside a confined space can be very different from the atmosphere outside. Deadly gases may be trapped inside, particularly if the space is used to store or process chemicals or organic substances which may decompose. There may not be enough oxygen inside the confined space to support life, or the air could be so oxygen-rich that it is likely to increase the chance of fire or explosion if a source of ignition is present. Not designed for continuous worker occupancy: Most confined spaces are not designed for workers to enter and work in them on a routine basis. They are designed to store a product, enclose materials and processes, or transport products or substances. Therefore, occasional worker entry for survey, inspection, maintenance, repair, cleanup, or similar tasks is often difficult and dangerous due to chemical or physical hazards within the space. A confined space found in the workplace may have a combination of these three characteristics, which can complicate working in and around these spaces as well as rescue operations during emergencies.
If a survey requires entry to one or more work spaces with the characteristics listed above, read the following information – some day it may save life.
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2 Confined Space Hazards 2.1 Hazardous atmospheres from the containment in the tank
The atmosphere in a confined space may be extremely hazardous because of the lack of natural air movement. This characteristic of confined spaces can result in: — oxygen-deficient atmosphere, — flammable atmospheres, and/or — toxic atmospheres.
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2.1.1 Oxygen-deficient atmosphere General The health effects and consequences because of lack of oxygen in a confined space are listed in the table below. These effects will take place without any warning such as odour or physical symptoms. Health effects from lack of oxygen O2 level
Effects
22 %
Oxygen enriched atmosphere
20.8%
Normal level – Safe for Entry (± 0.2%)
19.5%
Oxygen deficient atmosphere
16%
Impaired judgement and breathing
14%
Rapid fatigue and faulty judgement
11%
Difficult breathing and death in a few minutes
Lack of oxygen leads very quickly to unconsciousness and death. Lack of oxygen may be a problem in all kinds of confined spaces, it is therefore considered as the most dangerous factor when considering dangers in a confined space. The oxygen level in a confined space can decrease because of work being done, such as welding, cutting, or brazing; or, it can be decreased by certain chemical reactions like: rusting, paint drying or through bacterial action (fermentation). In tanks and/or voids of complicated geometry with high possibility of "pockets of atmosphere" with low O2-content, and where rescue operations may be difficult, the use of a portable oxygen meter with audible alarm is strongly recommended. Inert gas, N2 and exhaust Inert gas is a non-reactive gas used to prevent possible explosive atmosphere from different cargo vapours. On Oil Tankers the most common inert gas is the exhaust from oil fired boilers, main- or auxiliary engines. On Chemical Tankers the most common inert gas is nitrogen. Pure nitrogen is not poisonous itself, but it causes displacement of the natural breathing environment. Exhaust contains hundreds of chemical compositions. Main components are: carbon monoxide, oxygen, nitrogen, water vapour, sulphur dioxide, nitrogen oxides and hydrocarbons. The exhaust as described above may cause reduced lung capacity and increased respiratory in addition to irritating mucous membrane in eye, nose and throat. Total dilution of oxygen by another gas, such as carbon dioxide, will result in unconsciousness, followed by death. Bulk Cargoes A number of bulk cargoes may cause low level of oxygen in the cargo hold. This is mainly with cargoes like vegetables, grain, timber, forestry products, iron metals, metal sulphide concentrates and coal. Some bulk cargoes may oxidize which may result in reduced level of oxygen, poisonous gases, or self ignition. Other bulk cargoes may produce poisonous gases without oxidation, especially when they are wet.
2.1.2 Flammable atmospheres Two things make an atmosphere flammable: — the oxygen in air, and — a flammable gas, vapour, chemical reaction or dust in a proper mixture.
Different gases have different flammable ranges. If a source of ignition (e.g. a sparking or electrical tool, static electricity, sand blasting) is introduced into a space containing a flammable atmosphere, an explosion will result. An oxygen-enriched atmosphere (above 22%) will cause flammable materials, such as clothing and hair, to burn violently when ignited. Therefore, never use pure oxygen to ventilate a confined space. Ventilate with normal air. Some bulk cargoes may produce health toxic dust which also will represent an explosive hazard, especially during cargo handling and cleaning.
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2.1.3 Toxic atmosphere Unless a certified Marine Chemist or a competent person has certified a space as safe, assume that any substance (liquids, vapours, gases, mists, solid materials and dust) in a confined space can be hazardous. Toxic substances may range from fast acting poisons to long term cancer causing carcinogens. Toxic substances can come from the following: — the product stored in the space; — the work being performed in a confined space; — areas adjacent to the confined space.
Some bulk cargoes will act corrosive on skin, eye and mucous membrane.
Products stored in the space: Chemical products In cargo tanks for chemicals it is possible to find all types of chemicals. It is very important that the customer provides a Data Sheet for the product that has been stored in the tank and follows the instructions for safety measures according to this. Health effects as a result of exposure from chemicals in general may cause immediate headache, nausea, fainting and possible death. Long-term exposure to benzene can result in serious blood disorders such as allergy, anaemia and leukaemia. Chemicals can be absorbed into the structure and/or tank coatings and give off toxic gases at a later stage. When removed or when cleaning out the residue of a stored product, toxic gases can be given off. It is very important to follow the marking and recommendations as given in the Data Sheet to reduce immediate damage as well as the risk for long term damage. Petroleum products Most petroleum products are distilled from crude oil which is a product with very high complexity regarding composition of different substances. The composition of crude oil and the products distilled from crude may vary depending on what part of the world the production of crude took place. Petroleum products may be absorbed into the body by inhalation, absorbed through skin or ingested. Effects to health will depend on how high exposure and for how long. Immediate effects of high exposure can include headaches, tiredness, nausea and dizziness. Unconsciousness may occur if exposure is very high. Long-term exposure can result in serious blood disorders such as anaemia and leukaemia.
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Be aware that several of the fuels on the market have different additives to prevent e.g. bacteria growth in diesel. These additives may be highly toxic. When the additives are above a certain percentage they are supposed to be included in the Data Sheet. If the amount of additives is very small it does not need to be a part of the Data Sheet. Be aware that several of the fuel producers are very reluctant to reveal what kind of additives they are using in fuels, because this is considered to be business sensitive. Extra care should then be taken with respect to cleaning and measuring for the correct toxic product in diesel and fuel oil tanks. When testing for toxins in a confined space that has contained petroleum products, it may be very difficult to decide what toxic gas to measure for. In general, testing for the most dangerous toxic product in the composition should be carried out. If not otherwise stated on the Data Sheet, benzene is the most toxic part in petroleum products and measuring for this product should be done. If the readings for benzene are within the limits, all the other natural parts of the petroleum product should be within the acceptance limits. Hydrogen sulphide, H2S Hydrogen sulphide is highly toxic and also flammable and is created by the decay of organic matter that is found in sewers and sewage treatment plants. H2S may also be found in crude oil tanks, ballast tanks, void spaces and other tanks that have been empty and decomposition of organic material has taken place. Hydrogen sulphide is heavier than air and has no colour but does have a strong “rotten egg” odour at low concentrations. Hydrogen sulphide can affect when inhaled and when passed through the skin. Contact can irritate the eyes. Longterm exposure to low levels can cause pain and redness of the eyes with blurred vision. Breathing hydrogen sulphide can irritate the nose, throat and irritate the lungs causing coughing and/or shortness of breath. Higher exposures can cause a build-up of fluid in the lungs (pulmonary oedema), a medical emergency with severe shortness of breath. Exposure can cause nausea, dizziness, confusion, headache and trouble with sleeping. Very high levels can cause immediate death. Hydrogen Sulphide is a HIGHLY FLAMMABLE GAS and a DANGEROUS FIRE HAZARD. At high concentrations H2S paralyses neurons inside the nose and the odour cannot be smelled, hence smelling should not be used as an indicator that the tank is free from hydrogen sulphide. Example: Removal of sludge or mud from a tank-decomposed material can give off deadly hydrogen sulphide gas and/or methane gas. Benzene Benzene is a highly flammable liquid which occurs naturally in crude oil, natural gas and some ground waters. It is also manufactured from crude oil and is present in crude oil vapours. Benzene evaporates easily, and most people can just detect its distinctive smell at concentrations between 2.5 and 5 ppm in air. Exposure to benzene may occur in oil refineries, chemical and petrochemical plants including offshore installations. Benzene can be absorbed into the body by inhalation, absorbed through skin or ingested. Benzene can affect human beings when inhaled and when passed through the skin. It can irritate the eyes and skin with drying and scaling of the skin. Exposure can irritate the nose and throat. Benzene can cause symptoms of dizziness, light-headedness, headache and vomiting. Convulsions and coma, or sudden death from irregular heart beat, may follow high exposure. Repeated exposure can cause damage to the blood cells (aplastic anaemia). Methane Methane is an odourless, colourless gas, or liquid under pressure. It is used as a fuel and in the manufacture of organic chemicals, acetylene, hydrogen cyanide, and hydrogen. Methane is a HIGHLY FLAMMABLE GAS and a DANGEROUS FIRE and EXPLOSION HAZARD. In addition to being an explosion hazard, very high levels of methane can cause suffocation from lack of oxygen. Skin contact with liquid methane can cause frostbite. Solvents Many solvents, such as kerosene, gasoline, paint strippers, degreasers, are not only flammable, but if inhaled at high concentrations can cause central nervous system (CNS) effects. CNS effects can include dizziness, drowsiness, lack of concentration, confusion, headaches, coma and death. Solvents should never be used as cleaners for the purpose of removing paint or similar from hands. If liquid solvents are in contact with skin, they are absorbed through the skin 10 times more efficiently compared to high content solvent gas absorbed into the body through breathing. LSA’s Naturally occurring radioactive materials have been known to be present in varying concentrations in hydrocarbon reservoirs in a number of areas of the world. It is now recognised that these materials can give rise to radioactive scales (and sludge), which are usually referred to as Low Specific Activity (LSA) scale.
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The scales tend to be barium sulphate and strontium sulphate, which co-precipitate with naturally occurring radium leached out of the reservoir rock; such scales emit alpha, beta and gamma radiation and this, together with the physical properties of the LSA scale, can give rise to problems if such scales or sludge have to be removed, handled or disposed. Levels of radioactivity can vary from just above background radiation to those requiring restricted areas and classified workers. Others Fibre: Synthetic mineral fibre is a common description for fibrous inorganic products mainly represented from rock, clay, slag and/or glass. These fibres can be classified as follows: — fibre glass (glass wool/ fibreglass); — mineral wool (rock wool/ slag-wool); — ceramic fibre.
Long term exposure in high concentrations may increase risk of lung cancer. This is observed among workers fabricating such products. Surveyors will normally not be exposed to concentration levels or time periods which are considered to be of high risk. However, low concentrations may lead to skin- and respiratory irritation. Leakage of refrigerating system Ammonia. Ammonia is used as refrigerant, distributed within cooling system for fish-factory vessel and hold area. Normal pressure is approximately 20 bars. Ammonia does have a characteristic odour, even for low concentration levels. The health effect and consequences of ammonia are listed in the table below: Concentration: (ppm) 20-50 40-100 400-700 1700 5000-10000
Health effect: Characteristic odour Eye and respiratory irritation Serious eye and respiratory irritation – possible irreparable damage Convulsive coughing, bronchial spasm, deadly after ½ h exposure Deadly
CO2: CO2 is natural occurrence in exhaled air, however high concentrations can be hazardous. CO2 is odourless and is heavier than normal air. Concentrations may occur in the lower part of the tanks, close to the bottom. Low concentrations – below 5% are not considered as hazardous. Concentrations above 5% may lead to increased breath intensity and death. Also long term exposure may lead to unconsciousness and death. Propane/ butane: Because of huge fire hazard related to these two products, they will normally not be found onboard vessels except from vessels carrying high risk fire hazardous products i.e. gas carriers. Inhalation of high concentrations may lead to heart arrhythmia (heart rate interruption), and feel suffocating. Group 1 refrigerant. These refrigerants are non-poisonous and non-fire hazardous. The most common name for these products is Freon. Group 1 refrigerants consist of a number of chlorofluorocarbon combinations. Distribution onboard vessels are mainly within cooling system for fish factory- and hold area. CFC = chlorofluorocarbon (i.e. R-11, R-12). These refrigerants are no longer allowed onboard new-buildings, but still exist onboard existing vessels. HCFC = hydro-chlorofluorocarbon (i.e. R-22). These refrigerants may still be found onboard, but a phase out program has started. HFC = hydro-fluoro-carbon (i.e. R-134a, R-404a, R410a, R-507). These refrigerants are presently used for most new refrigerating plant installations. Exposure to Group 1 refrigerant may cause eye- and/ or skin irritation. High concentrations may cause dizziness, spasm and may affect the central nervous system and lead to heart rate interruption. Be aware of the fact that refrigerants will displace O2. Refrigerant gases are odourless. Ammonia in fish holds: Note the hazards of ammonia in fish holds where nets are stored when in a period of refit or from fish, and/or by fish products in fishing vessel bilge wells.
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Hydrogen emission from anodes and/or accumulators: Hydrogen gas (H2) is produced from an electrolytic reaction from zincous-/carbon and alkaline accumulators. A mix of hydrogen gas (H2) and oxygen (O2) may form a highly explosive mixture. Hydrogen gas (H2) is a light gas which displaces oxygen (O2). Oxygen measuring equipment is recommended to be used when entering accumulator room and other enclosures where accumulators are kept.
2.2 Work being performed in a confined space Examples of such include welding, cutting, brazing, painting, scraping, sand blasting and degreasing. Toxic atmospheres are generated in various processes. For example, cleaning solvents are used in many industries for cleaning/degreasing. The vapours from these solvents are very toxic in a confined space. It is also important to be aware that hot work carried out consumes oxygen. Welding Hot work on all surfaces with coating will create several gases which may be very toxic. This gas may come from hot work being carried out in a tank adjacent to the space being surveyed. Coating Special attention should be paid when spray coating is carried out in the area of the survey. Spray coating where small size particles are mixed with air will lead to high toxic exposure if inhaled. Grinding Grinding may cause miscellaneous compositions of dust. Absorption of metal dust into the body through inhalation is dependent on the physical and chemical properties and the size of the particles. Dust like this may cause metal fume fever and bronchitis. Sandblasting The dangers connected to sandblasting very much depend on the object’s substance and the size and containment of grit. Several grits used for sandblasting contain carcinogenic substances like quartz, nickel, lead and lead compound. During sandblasting the containment of carcinogenic chemicals may increase depending on the surface of the sandblasted area. Hydro blasting Hydro blasting may create aerosols. Aerosols are dispersion of solid or liquid particles in air which are small enough to stay in the air for a long period of time. Aerosols may transport reactive chemicals deep into the lungs in a way that causes very high exposure. Aerosols may be produced from dust, dirt and cleaning chemicals in the process of high-pressure cleaning of miscellaneous surfaces. NDT operations Chemicals from NDT operations may also be dangerous. Most ultrasonic thickness measuring equipment is not intrinsically safe.
3 Testing 3.1 General It is important to understand that some gases or vapours are heavier than air and will settle to the bottom of a confined space. Also, some gases are lighter than air and will be found around the top of the confined space. Therefore, it is necessary to test all areas (top, middle and bottom) of a confined space with properly calibrated testing instruments to determine what gases are present. Atmospheres may be different in individual bays of the same tank. If testing reveals oxygen-deficiency, or the presence of toxic gases or vapours, the space must be ventilated and re-tested before entering. If in doubt whether the gas to be measured is lighter or heavier than air, consider the properties for the possible gas in question and compare it with the molecule weight of air. Weight of air: 28.8 mol Methane, CH4 is lighter than air. All gases from liquids under normal conditions are heavier than air (except ammonia).
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No tank is to be entered until the tank atmosphere has been thoroughly tested with approved and calibrated instruments. Following tests are to confirm that all areas of the tank, bottom in particular, are safe for entry, i.e.: — oxygen-deficient atmosphere, — flammable atmospheres, and/or — toxic atmospheres.
It is important to start the measurement of the tank atmosphere by measuring the HC (Hydrocarbon) content in % by volume and that the combustible gas detector is not used before the atmosphere content is less than Lower Explosive Limit (LEL). If measurement is started at a higher level the catalytic metal filament in the combustible gas detector may be destroyed. Combination instruments are available with a measuring range 0-100% by volume and 0-100% LEL.
3.2 Testing instruments Testing instruments for oxygen and flammability read in percent. The oxygen meter should indicate 20.8% oxygen in the space being tested. The flammability indicator shows the percent within a safety range of 0-10% of the Lower Explosive Limit (LEL) and, ideally, should read 0%. Testing instruments are available in several different forms, hand powered by squeezing a rubber bulb or bellows, and battery powered giving the indication either on an analogue gauge or digital read-out. Be aware that in cases where Draeger tube or equal is used for detecting toxic gases the sampling gas should have sufficient time to pass through the sampling hose. It is important to follow the instructions for use given by the manufacturer of the instrument. As a rule, if a manual hand rubber pump is used, approximately 4 squeezes are needed for each metre of the sampling hose. If battery driven pumps are used, approximately 10 seconds for each metre of sampling hose should be sufficient.
4 Ventilation Ventilation by a blower, eductor or fan may be necessary to remove harmful gases and vapours from a confined space. There are several methods for ventilating a confined space. The method and equipment chosen are dependent upon the size of the confined space openings, the gases to be diluted (e.g. are they flammable?), and the source of make-up air. Under certain conditions where flammable gases or vapours have displaced the oxygen level, but are too rich to burn, forced air ventilation may dilute them until they are within the explosive range. Also, if inert gases (e.g. carbon dioxide, nitrogen) are used in the confined space, the space should be well ventilated and re-tested before a surveyor may enter. A common method of ventilation requires a large hose, one end attached to a fan and the other lowered into a manhole or opening. For example, a manhole would have the ventilating hose run to the bottom (see figure) to dilute or displace all harmful gases and vapours.
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The air intake should be placed in an area that will draw in fresh air only. Schematic principles for ventilation:
Ventilation should be continuous where possible, because in many confined spaces the hazardous atmosphere will form again when the flow of air is stopped. All openings are to be opened for ventilation and emergency exit.
5 Isolation of space Isolation of a confined space is a process where the space is removed from service by one or more of the following. Locking out: Electrical sources, preferably at disconnect switches remote from the equipment. Blanking and bleeding, securing valves: Cargo, ballast, IGS, pneumatic and hydraulic lines. The inert gas branch should be blanked off. The appropriate blanking is to be checked at each tank if entry is required while inerting, or gas freeing of other tanks is taking place, or if any other tanks are inerted or contain hydrocarbons. An alternative to pipe blanking would be to remove a section of the branch line. Disconnecting: Mechanical linkages on shaft-driven equipment where possible. Securing: Mechanical moving parts within confined spaces with latches, chains, chocks, blocks, or other devices. Notice boards: Appropriate notices, which clearly specify which space and prevailing requirements agreed upon for confined space entry, should be displayed in prominent locations such as bridge, cargo control room, and/or engine control room.
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Blanking, locking and securing of equipment:
6 General and physical hazards 6.1 Temperature extremes Extremely hot or cold temperature can present problem for the surveyor. Cold temperature. At very cold temperatures, the most serious concern is the risk of hypothermia or dangerously low body temperature. Another serious effect of cold exposure is frostbite or freezing of the exposed extremities such as fingers, toes, nose and ear lobes. Hypothermia could be fatal in absence of immediate medical attention. Warning signs of hypothermia can include complaints of nausea, fatigue, dizziness, irritability or euphoria. Surveyors can also experience pain in their extremities (for example hands, feet, ears) and severe shivering. Surveyors should be moved to a heated shelter and seek medical advice when appropriate. Heat. A person working in a very hot environment loses water and salt through sweat. This loss should be compensated by water and salt intake. Fluid intake should equal fluid loss. On average, about one litre of water each hour may be required to replace the fluid loss. Plenty of drinking water should be available on the job site and persons should be encouraged to drink water every 15 to 20 minutes even if they do not feel thirsty. Drinks specially designed to replace body fluids and electrolytes may be taken. Alcoholic drinks should NEVER be taken as alcohol dehydrates the body. An acclimatized surveyor loses relatively little salt in their sweat and therefore the salt in the normal diet is usually sufficient to maintain the electrolyte balance in the body fluids. For un-acclimatized surveyors who may sweat continuously and repeatedly, additional salt in the food may be used. Salt tablets are not recommended because the salt does not enter the body system as fast as water or other fluids. Too much salt can cause higher body temperatures, increased thirst and nausea. Persons on salt-restricted diets should discuss the need for supplementary salt with their doctor. When working at extreme temperatures the working hours should be adjusted to avoid the most extreme temperatures during the day. Working in the evenings and early in the morning is often a good solution to avoid the most extreme conditions. How the body reacts to extreme temperatures is very individual. Never take any chances and pay careful attention when performing work in extreme temperature environment. Working speed and rest schedule should be adjusted according to the temperature.
6.2 Engulfment hazards Loose, granular material stored in holds or tanks, such as grain, sand, coal, or similar material, can engulf and suffocate a person. The loose material can crust or bridge over and break loose under the weight of a person.
6.3 Noise Noise within a confined space can be amplified by the design and acoustic properties of the space. Excessive noise cannot only damage hearing, but can also affect communication, such as causing a shouted warning to go unheard.
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6.4 Falling objects Workers in confined spaces should be mindful of the possibility of falling objects, particularly in spaces, which have a topside opening for entry, and where work is being done above the worker.
6.5 Slick/Wet Surfaces
Slips and falls can occur on a wet surface causing injury or death to workers. Also, a wet surface will increase the likelihood for and effect of electric shock in areas where electrical circuits, equipment, and tools are used.
7 Guidelines for use of personal gas detectors For detection of any local pockets of gas or lack of oxygen the surveyor should use his portable oxygen or multi-gas meter with audible alarm features. This is especially important when entering tanks and/or voids of complicated geometry with high possibility of "pockets of atmosphere" with low O2-content, and where rescue operations may be difficult. Preferably a multi-gas meter should be used, capable of simultaneous monitoring of oxygen, combustible gases and hydrogen sulphide and carbon monoxide. Note that CO sensors may also be sensitive to low concentrations of hydrogen (H2) therefore it is important to evaluate the possibility for CO/hydrogen in the space. Anodes will generate hydrogen when in use. Most measuring equipment is sensitive apparatus with limitations for the range they are capable of measuring. Sensors in all measuring equipment may be destroyed if exposed to extreme measurements (e.g. above 100% LEL), clogged filters or catalyst poison (silicone, lead, sulphur and chlorous) The personal protective instrument should be turned on before tank entry.
7.1 Function test and full calibration The difference between a function (bump) test and a full calibration: — A function (bump) test is defined as a means of verifying calibration by using a known concentration of test gas
to demonstrate that an instrument's response to the test gas is within acceptable limits.
— A full calibration is defined as the adjustment of an instrument's response to match desired value compared to a
known concentration of test gas.
A function (bump) test or full calibration of direct reading portable gas monitors should be made before each day’s use in accordance with the manufacturer's instructions using appropriate test gas. Any instrument that fails a function (bump) test must be adjusted by means of a full calibration procedure before further use. Various standard types of calibration gases are available in handy size bottles. For calibration of all gas measuring equipment at least 2 points along the measuring range are needed to determine the accuracy.
Note: Surveyors should never use their personal gas detectors to test a space for entry. Owner is responsible to make the space safe for entry. 8 Survey preparations 8.1 Cleaning
Tanks and spaces to be surveyed must be sufficiently clean and free from water, scale, dirt and oil residues to reveal excessive corrosion, significant deformation, fractures, damage and other structural deterioration. There is no point in entering a tank if the bottom of the tank is not visible and the intention of the survey is to survey those areas. Tank cleaning can be performed with an existing fixed tank cleaning system. However, in shadow areas portable washing machines may have to be used in order to achieve sufficient degree of cleanliness. Generally, tank surveys should be avoided in tanks in which de-sludging operations are taking place since these operations can potentially raise gas levels. When entering into a HFO, lube oil or diesel fuel tank, extra care should be taken when considering cleanliness and
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atmosphere. Long term effects of exposure to substances found in these tanks are not well documented.
8.2 Lighting
Whenever possible, natural lighting should be provided in the tank during inspection by opening all tank hatches. In general a pocket size backup light should always be carried when working in confined spaces in case of loss of light. Lighting in confined spaces may not be good and will normally be temporary arrangements cabled into the space or by torchlight.
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GUIDANCE FOR UNDERGOING CLASS MAINTENANCE SURVEYS
Checklist for Entry into Confined Spaces DO NOT ENTER A CONFINED SPACE UNTIL YOU HAVE CONSIDERED EVERY QUESTION AS WELL AS ANY OTHER ITEM OF CONCERN, AND HAVE DETERMINED THE SPACE TO BE SAFE. THE FINAL DECISION IS YOURS. YES
NO 1. SAFETY MEETING
Safety meeting is carried out prior to survey to discuss all aspects of safety measures?
Will someone accompany you into the space? 2. PERMIT (The permit is an authorization, usually in writing, that states that the space has been tested by a qualified person and that the space is safe for entry; what precautions, equipment, etc. are required; and what work is to be done.)
Has a confined space entry permit been issued?
Is the permit up to date? 3. VERIFICATION
Are the instruments used in atmospheric testing properly calibrated?
Was the person performing the tests a certified Marine Chemist, a Competent person, or equivalent?
Was the atmosphere in the confined space tested? 4. TESTING
Was Oxygen at least 20.8% but not more than 21%?
Were toxic, flammable, or oxygen-diluting gases/vapors present? - Hydrogen sulfide - Carbon monoxide - Methane - Carbon dioxide - Other (list) ___________________________________ ___________________________________ - 207 -
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YES
NO 5. MONITORING
Will the atmosphere in the space be monitored while work is going on? Remember – atmospheric changes occur due to the work procedure or the product stored and vessel movements and temperature changes. The atmosphere may change very quickly. 6. VENTILATION
Has the space been ventilated before entry?
Will ventilation be continued during entry?
Is the air intake for the ventilation system located in an area that is free of combustible dusts and vapours and toxic substances? If atmosphere was found unacceptable and then ventilated, was it re-tested before entry? 7. ISOLATION
Has the space been isolated from other systems?
Has electrical equipment been locked out?
Have disconnected been used where possible?
Has mechanical equipment been blocked, chocked, and disengaged where necessary? Have lines under pressure been blanked and bled?
Have the necessary Notice boards been placed in the operations locations and at the confined space entry point? 8. CLOTHING/EQUIPMENT
Is special clothing required (boots, chemical suits, glasses, etc.)?
Is special equipment required (e.g. rescue equipment, communications equipment, heavy duty raft, life vests, etc.)? Are special tools required (e.g. spark proof, intrinsically safe)?
9. TRAINING Have you been trained in confined space entry and do you know what to look for? - 208 -
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YES
NO 10. STANDBY / RESCUE
Will there be a standby person on the outside in constant visual or auditory communication with the person on the inside? Will the standby person be able to see and/or hear the person inside at all times?
Note: The surveyor should not enter a tank/compartment if breathing apparatus/gas masks is required.
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GUIDANCE FOR UNDERGOING CLASS MAINTENANCE SURVEYS
Appendix 6-2
No. 39 (1995) Rev. 1 (Nov 2003) Complete Revision
Rev. 2 (Oct 2005) Rev. 3 (Mar 2009)
IACS
SAFE USE OF RAFTS OR BOATS FOR SURVEY
IACS Rec. 1995/Rev. 3 2009
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1. Access to Structures 1.1 For overall survey, means shall be provided to enable the attending surveyor(s) to examine the structure in a safe and practical way. 1.2 For close-up survey, one or more of the following means for access, acceptable to the attending surveyor(s), shall be provided:
a) b) c) d) e)
permanent staging and passages through structures temporary staging and passages through structures lifts and moveable platforms rafts or boats other equivalent means.
1.3 Surveys of tanks or spaces by means of rafts or boats may only be undertaken with the agreement of the attending surveyor(s), who shall take into account the safety arrangements provided, including weather forecasting and ship response in reasonable sea conditions. 1.4 When rafts or boats will be used for close-up survey the following conditions shall be observed: a) Only rough duty, inflatable rafts or boats, having satisfactory residual buoyancy and stability even if one chamber is ruptured, shall be used; b) The boat or raft shall be tethered to the access ladder and an additional person shall be stationed down the access ladder with a clear view of the boat or raft; c) Appropriate lifejackets shall be available for all participants; d) The surface of water in the tank shall be calm (under all foreseeable conditions the expected rise of water within the tank shall not exceed 0.25 m) and the water level stationary. On no account shall the level of the water be rising while the boat or raft is in use; e) The tank or space must contain clean ballast water only. When a thin sheen of oil on the water is observed, further testing of the atmosphere is to be done to ensure that the tank or space is safe for entering; Further reference is made to IACS Recommendation No. 72 Confined Space Safe Practice. f)
At no time shall the upside of the boat or raft be allowed to be within 1 m of the deepest under deck web face flat so that the survey team is not isolated from a direct escape route to the tank hatch. Filling to levels above the deck transverses shall only be contemplated if a deck access manhole is fitted and open in the bay being examined, so that an escape route for the survey party is available at all times;
g) If the tanks (or spaces) are connected by a common venting system, or inert gas system, the tank in which the boat or raft is to be used shall be isolated to prevent a transfer of gas from other tanks (or spaces).
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1.5 In addition to the above, rafts or boats alone may be allowed for close-up survey of the under deck areas for tanks or spaces if the depth of the webs are 1.5 m or less. If the depth of the webs is more than 1.5 m, rafts or boats alone may be allowed only. a) When the coating of the under deck structure is in GOOD condition and there is no evidence of wastage; or b) If a permanent means of access is provided in each bay to allow safe entry and exit. This means: i. access direct from the deck via a vertical ladder and a small platform fitted approximately 2 m below the deck in each bay; or ii. access to deck from a longitudinal permanent platform having ladders to deck in each end of the tank. The platform shall, for the full length of the tank, be arranged in level with, or above, the maximum water level needed for rafting of under deck structure. For this purpose, the ullage corresponding to the maximum water level is to be assumed not more than 3m from the deck plate measured at the midspan of deck transverses and in the middle length of the tank. (See Figure 1). If neither of the above conditions are met, then staging or an “other equivalent means” is to be provided for the survey of the under deck areas.
Figure 1 Note: Item 1.5 is a mandatory IACS unified requirement (UR Z10s). 2.0 Safety Meetings 2.1 The establishment of proper preparation and the close co-operation between the attending surveyor(s) and the company’s representatives onboard prior to and during the survey are an essential part in the safe and efficient conduct of the survey. 2.2 Applicable safety procedures and responsibilities shall be discussed and agreed to ensure that the survey is carried out under controlled conditions. Safety Meetings shall be held prior to entering the tank or space and regularly during the survey on board.
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Further reference is made to IACS Recommendation No.72 Confined Space Safe Practice. 3.0 Communication Arrangements and Equipment for Survey 3.1 The attending surveyor(s) shall always be accompanied by at least one responsible person assigned by the company experienced in tank and enclosed spaces inspection. In addition a backup team of at least two experienced persons shall be stationed at the hatch opening of the tank or space that is being surveyed. The back-up team shall continuously observe the work in the tank or space and shall keep lifesaving and evacuation equipment ready for use. 3.2 A communication system shall be arranged between the survey party in the tank or space being examined, the responsible officer on deck, the navigation bridge and the personnel in charge of handling the ballast pump(s) in the pump control room. These communication arrangements shall be maintained throughout the survey. 3.3 Adequate and safe lighting shall be provided for the safe and efficient conduct of the survey. 3.4 Adequate protective clothing shall be made available and used (e.g. safety helmet, gloves, safety shoes, etc) during the survey.
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Appendix 6-3
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GUIDANCE FOR UNDERGOING CLASS MAINTENANCE SURVEYS
NIPPON KAIJI KYOKAI
Ship’s name:
CHECK LIST FOR SAFE USE OF RAFTS OR BOATS FOR SURVEY Class No.:
Survey Date:
Name of Space(s) for survey: This check list should be used in addition to the “Check List for Safe Entry into Confined Spaces” (Form Safety check (confined space)).
When rafts or boats will be used for survey the following conditions should be observed. A. Safety Meeting
□ □
1. 2.
Safety meeting is carried out prior to survey. Applicable safety procedures and responsibilities are discussed and agreed to ensure that the survey is carried out under controlled conditions.
B. Safety Measures
□ □
3. 4.
□ □ □ □
5. 6. 7-1 7-2
□
8.
□
9.
□ □
10-1 10-2
Rafts or boats have satisfactory residual buoyancy and stability even if one chamber is ruptured. Rafts or boats are tethered to the access ladder and an additional person is stationed down the access ladder with a clear view of the boat or raft. Appropriate lifejackets are available for all participants. The surface of water in the tank is calm. The tank or space contains clean ballast water only. When a thin sheen of oil on the water is observed, further testing of atmosphere is carried out to ensure that the tank or space is safe for entering. Upside of the boat or raft is within 1 m of the deepest under deck web face flat so that the survey team is not isolated from a direct escape route to the tank hatch. If the tanks (or spaces) are connected by a common venting system, or inert gas system, the tank is isolated to prevent a transfer of gas from other tanks (or spaces). The depth of the under deck webs is 1.5 m or less. If the depth of the under deck webs is more than 1.5 m, □ Coating of the under deck structure is in GOOD condition and there is no evidence of wastage, □ Permanent means of access is provided in each bay to allow safe entry and exit, or □ The staging or an "other equivalent means" is provided for the survey of the under deck areas.
C. Communication Arrangements and Equipment for Survey
□
11.
□
12.
□
13.
□
14.
□ □
15. 16.
The attending surveyor(s) is always accompanied by at least one responsible person assigned by the company experienced in tank and enclosed spaces inspection. In addition, a backup team of at least two experienced persons is stationed at the hatch opening of the tank or space that is being surveyed. The backup team observes the work in the tank or space continuously and keeps lifesaving and evacuation equipment ready for use. Communication system is arranged between the survey party in the tank or space being examined, the responsible officer on deck, the navigation bridge and the personnel in charge of handling the ballast pump(s) in the pump control room. Adequate and safe lighting is provided for the safe and efficient conduct of the survey. Adequate protective clothing is be made available and used (e.g. safety helmet, gloves, safety shoes, etc) during the survey.
Marks to be used: X = Considered satisfactory, N = Not satisfactory or doubtful, N/A = Not applicable “N” leads to cancellation of use the rafts or boats for survey.
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Date and Signature
GUIDANCE FOR UNDERGOING CLASS MAINTENANCE SURVEYS
Appendix 6-4
IACS Recommendation No.78 (Sep. 2002)
Safe Use of Portable Ladders for Close-up Surveys
1. The Owner should ensure that equipment selected for temporary work affords adequate protection against the risks of falls from a height. 2. The manner is which portable ladders can most safely be used by workers should be specified. 3. Portable ladders should rest on a stable, strong, suitably sized, immobile footing so that the rungs remain horizontal. Suspended ladders should be attached in a manner so that they can not be displaced and so that swinging is prevented. 4. The feet of portable ladders should be prevented from slipping during use by securing the stiles at or near their upper and lower ends, by any anti-slip device or by other arrangements of equivalent effectiveness. Slip resistant feet should not be used as substitute for the care in placing, lashing or holding a ladder upon slippery surface. 5. Portable ladders should meet the following criteria: • Not more than 5 m in length for freestanding portable ladders. • Non-self supporting and self-supporting portable ladders should support at least four times the maximum intended load. • The minimum clear distance between side rails for all portable ladders should be according to a recognized standard. • The rungs and steps of portable ladders should be designed to minimize slipping, e.g. corrugated, knurled, dimpled, coated with skid resistance material. 6. Ladders should be maintained free of oil, grease and other slipping hazards.
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