Pressure Vessels 015 CH 1001

KUWAIT OIL COMPANY (K.S.C.)

Engineering Group-

Specification Number

015-CH-1001 Pressure Vessels

1

08 SEPT 9 4

ISSUED AS KOC ENG. GROUP SPEC.

0

07 MAR 9 4

ISSUED FOR INVITATION TO BID

Rev

Date

Revision

BY

Chkd

Section

PE

Client

QKOC

Engindng Gmup S p ~ ~

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Specification Number

Rev

Date

Sheet

01 5-CH-1001

1

08-9-94

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CONTENTS 1.0 2.0

3.0 4.0

5.0

6.0 7.0

8.0

9.0

10.0

11.0 12.0 13.0

............................................. 4 STANDARD SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 SERVICECONDITIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 TECHNICAL REQUIREMENTS ............................. 6 4.1 Company Vessel Design Data ......................... 6 4 . 2 Contractor-Designed Vessels . . . . . . . . . . . . . . . . . . . . . . . . . 6 MATERIALS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 CODES AND REGULATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 DESIGN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 7.1 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 7.2 Loading . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 7.3 Combinations of Loading . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 0 7 . 4 Corrosion Allowance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 0 7.5 Minimum Thickness . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 0 CONSTRUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 8.1 Heads . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 8 . 2 Nozzles . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 8.3 Bolting and Gaskets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 2 8 . 4 Manholes and Handholes . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 3 8.5 External Attachments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 4 8.6 lnternals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 4 8.7 Skirts and Supports . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 4 FABRICATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 9.1 Welding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 5 9.2 Radiography ..................................... 1 6 9 . 3 Stress Relieving . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 6 9 . 4 Tolerances . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 7 INSPECTION AND TESTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 7 10.1 Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 7 10.2 Tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 8 10.3 Vessel Hydrostatic Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 0 FIREPROOFING AND INSULATION . . . . . . . . . . . . . . . . . . . . . . . . . . 2 1 PAINTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 1 MISCELLANEOUS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 2 SCOPE

Engineering Group

Specification Number

Rev

Date

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016-CH-1001

1

08-9-94

3 of 36

...................................... 22 PACKING. MARKING AND DOCUMENTATION . . . . . . . . . . . . . . . . . . 23 SPARE PARTS AND MAINTENANCE REQUIREMENTS . . . . . . . . . . . . 23 SUPPLEMENTAL REQUIREMENTS . . . . . . . . . . . . . . . . . . . . . . . . . . 23 17.1 Requirements for Wet Hydrogen Sulphide Service ........... 23 17.2 Metal Lining (Cladding) ............................. 24 17.3 Requirements for Tray Installation . . . . . . . . . . . . . . . . . . . . . . 28 17.4 Identification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

14.0 FIELD ERECTION 15.0 16.0 17.0

APPENDIX 1: GRAPH FOR DETERMINING PERIODIC TIME T AND LIMITS FOR STATICIDYNAMIC DESIGNS OF COLUMNS

..........

30

APPENDIX 2: NOZZLE LOADS FOR VESSELS (HORIZONTAL AND VERTICAL)

. . . . . . . . . . . . . . . . . . . . . . . 31 APPENDIX 3: LOAD DESIGN CASES AND LOAD COMBINATIONS . . . . . . . . 34 APPENDIX 4: PRESSURE VESSEL TOLERANCES . . . . . . . . . . . . . . . . . . . . . 35 TOLERANCES .HORIZONTAL VESSELS

. . . . . . . . . . . . . . . . . . . . . 36

APPENDIX 4: PRESSURE VESSEL TOLERANCES TOLERANCES .HORIZONTAL VESSELS

.

1.0

2.0

SCOPE 1-1

This specification covers the design, manufacture, inspection, testing and supply of pressure vessels for installation at the Facility in Kuwait. Vessels within packages shall conform t o this specification.

1.2

This specification complements the data sheets for the equipment in which the operating conditions and other requirements are listed in detail.

1.3

The supply of pressure vessels shall fully comply with all relevant contractual requirements specified in the Scope of Work and Technical Specification of the Contract.

STANDARD SPECIFICATIONS

2.1

Pressure vessels shall conform in design, materials and performance, except where otherwise specified, with the current issue and amendments of the following prevailing on the effective date of the Contract: 2.1.1

International Standards ASME Vlll Div 1

Unfired Pressure Vessels

ASME Vlll Div 2

Unfired Rules)

ASME IX

Qualification Standard for Welding and Brazing Procedures, Welders, Brazers, and Welding and Brazing Operators

ASME II

Material Specification

ASME V

Non-Destructive Examination

ASME B 16.5

Steel Pipe Flanges and Flanged Fittings

ASME B 16.9

Factory-Made Wrought Steel Buttwelding Fittings

ASME B 31.3

Chemical Plant and Petroleum Refinery Piping

ASME 816.47

Large Diameter Steel Flanges (NPS 16 through NPS 60)

NACE MR0175

Sulphide Stress Cracking (S.S.C) Resistant Metallic Material for Oilfield Equipment

Pressure Vessels

(Alternative

A UnP Englndng ~ r w p

Specification Number

Rev

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01 5-CH-1001

1

08-9-94

5 of 36

Specr7icblZbn

2.1.2

2.1.3

ASTM A578 Level 1

Specification for Straight Beam Ultrasonic Examination of Plain and Clad Steel Plates for Special Applications

WRC Bulletin No. 107

Local Stresses in Spherical and Cylindrical Shells Due t o External Loadings

WRC Bulletin No. 297

Supplement t o Bulletin No. 107

British Standards BS 5500

Unfired Pressure Vessels

BS CP3 Chapter V

Basic Data for Design of Buildings

Part 2

Wind Loadings

Engineering Group Specifications All equipment and accessories covered by this specification shall comply with all relevant project specifications of which the following are specifically referenced in this specification: 0 1 5-AH-1001

Basic Design Criteria

015-AH-10 0 2

International Codes and Standards

0 1 5-CG-1001

The Use of Brackish Water for Site Hydrotesting of Equipment

0 15-KH- 1902

Spare Parts and Maintenance Requirements

0 1 5-LH-1001

Piping Material Classes

0 1 5-MH-1002

Structural Steel Design, Materials and Fabrication

0 1 5-NH-1003

Thermal and Acoustic Insulation

0 1 5-NH-1004

Passive Fireproofing Application

015-UH-1001

Packing, Marking and Documentation

0 1 5-WH-1001

Welding Procedure Approval and Welding Quality Requirements

Materials

and

E n g l d n g Gmup S p ~ ~

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01 5-XH-1005

3.0

4.0

Specification Number

Rev

01 5-CH-1001

1

Date

08-9-94

Sheet

6 of 36

Shop and Field Painting

2.2

Compliance with this specification shall not relieve the Contractor of its responsibility to supply equipment suited to meet the specified service conditions and applicable regulations.

2.3

Where conflicts exist between this specification and other Drawings, standards, codes and specifications, the most stringent shall be applied.

SERVICE CONDITIONS 3.1

The pressure vessels shall be suitable for continuous operation at a desert location under high ambient temperatures and humidity. The atmosphere at the Facility is generally dusty and corrosive and may contain traces of hydrogen sulphide.

3.2

Pressure vessels shall in all respects be suitable for continuous operation in the service conditions stated in the Engineering Group Specification entitled "Basic Design Criteria" (Number 01 5-AH-1001 ).

TECHNICAL REQUIREMENTS 4.1

C o m ~ a n vVessel Desian D a u Principal design Drawings which include design conditions, material specifications, principal dimensions, general requirements, etc. shall be furnished for each vessel by the Company.

4.2

Contractor-Desianed Vessels 4.2.1

When pressure vessels are furnished as part of a "package unit" or vessels whose inherent special process design features classify them as "proprietary" items, they shall be designed in compliance with all applicable sections of this specification.

4.2.2

Where data sheets indicating general service requirements, materials of construction, principal dimensions or capacities, etc., but no design, are furnished by the Company, the vessels shall be designed in accordance with all applicable sections of this specification which shall be in line with the relevant codes, standards and specifications.

4.2.3

Vertical or horizontal vessels with removable internals (i.e., filter vessels, etc.) shall have at least one 24-in. nominal bore (NB) manway where the vessel inside diameter (ID) is greater than 91 5 mm. Vessels 91 5 mm ID and less with removable internals shall have body flanges and/or a Company-approved quick release closure.

EngnOiK/ng Group SpeMcatbn 4.2.4

5.0

Specification Number

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Date

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01 5-CH-1001

I

06-9-94

7 of 36

Any deviation from these requirements shall be approved, in writing, by the Company.

MATERIALS All materials shall be new and of first quality and of the type and grade specified on the individual vessel drawings and data sheets. No substitution of material may be made without the written approval of the Company. Structural quality steels are not acceptable for pressure-retaining parts. Carbon content of ferritic steel components for welding shall not exceed 0.23%. The maximum carbon equivalent shall be 0.43%. Tubes or pipe for welding shall be seamless and manufactured by open hearth, basic oxygen or electric furnace process for pressure retaining parts. Internal attachments of columns and vessels, such as tray support rings and downcomer bolting bars, etc. shall be of the same type of material as the shell. Materials for sour service shall conform t o NACE MR0175 (latest edition) and paragraph 17.1 of this specification. Where the material specification is not indicated on the vessel data sheet or for pressure vessels within packages, the proposed material shall be submitted t o the Company for its approval. The use of ASTM A51 5 - Grade 7 0 material is not permitted.

6.0

7.0

CODES AND REGULATIONS 6.1

Design, materials, fabrication, inspection, testing and stamping shall be in accordance with the current edition of ASME Section VIII, Division I or Division II, ASME Section IX and the documents accompanying the Request for Bids and Purchase Order. When so specified on the data sheet, vessels shall be stamped with ASME code symbol "U."

6.2

National Laws and Regulations together with any local bylaws for Kuwait must be complied with.

DESIGN

7.1

General 7.1 .I Vessels covered by this specification shall be designed for the most severe combination of conditions which may be

Englneerlng Group

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08-9-94

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experienced in construction, normal operation and service. See paragraph 7.3 for load combinations.

7.2

Loading 7.2.1

Internal Pressure Design pressure at the highest point of a vertical vessel and at the highest point of a horizontal vessel shall be calculated as follows: Max Operating Pressure (MOP)

Design Pressure

1 to 2.4 barg (15 to 35 psig)

3.5 barg (50 psi@

2.4 to 10.4 barg (36 to 150 psig)

MOP 1 barg (15 psig)

10.4 to 34.5 barg (151 to 500 psig)

MOP x 1.1

34.5 to 69 barg (501 to 1000 psig)

3.5 barg MOP (50 psi@

+

+

MOP x 1.05* > 69 barg (1000 psig) * (maximum of MOP + 6.9 barg (100 psig) The minimum vessel internal design pressure shall be 3.5 barg (50 psig). Using the design pressure at highest point as stated above, the design pressure at any lower point is determined by adding the maximum operating liquid head and any pressure gradient within the vessel. Minimum Specific Gravity (SG) is 1.0. When vessels are stacked, intermediate heads shall be designed for the maximum differential pressure assuming either compartment is depressurised, except when design for differential pressure is indicated on the vessel data sheet . 7.2.2

External Pressure Vessels used in vacuum service or subjected to steam-out conditions shall be designed for an external pressure of 1.0 bar.

7.2.3

Design Temperature

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Design temperature shall not be less than the maximum temperature the material may attain under the operating conditions. In general, this shall be taken as 28OC above the maximum operating temperature unless.otherwise indicated on the Drawings and data sheets but shall not be less than 93OC. 7.2.4

External Loads a.

Vessels and anchor bolts shall be designed to resist all external loads such as wind, platforms, davits, connected pipework, etc. The wind loads shall be calculated as per BS CP3 Chapter V, Part 2, with the wind velocity of 45 mls at the height of 10 m from the grade level.

b.

Design wind speed Vs = V x S1 x S2 x S3 per CP3: Chapter V, Part 2, where

V S1 S2 S3

=basic wind velocity topography factor = 1.0 ground roughness category (1) country with no obstructions statistical factor = 1.0.

-

open

Test Loads Vessel shall be designed to resist all forces when completely filled with water in the corroded condition unless otherwise indicated in Drawings and data sheets. Dynamic Loads Vertical vessels requiring dynamic design as dictated by Appendix 1 of this specification shall be additionally checked for stability under conditions of wind-induced vibrations. The maximum allowable lateral deflection of vertical vessels due to wind shall not exceed HI300 for static and dynamic design (H = height including skirt). Nozzles Load a.

Process nozzles, relief lines and piped vent connections shall be designed to accept the nozzle loads as detailed in Appendix 2 of this specification.

b.

Local loadings may be evaluated in accordance with BS 5500 Appendix G or WRC Bulletin No. 107 or 297, as referred by ASME Section VIII, Div. 1.

Ewnodng Group Spedtkxtion

7.3

7.4

7.5

Specification Number

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01 5-CH-1001

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08-9-94

1 0 of 36

. .

Combmarnns o f LoadiQg 7.3.1

Vertical vessels shall be designed t o be self-supporting with load design cases and loading combinations in accordance with Table 1 of Appendix 3 of this specification.

7.3.2

Allowable tensile membrane stresses in tension for non-pressure parts may be increased by 3 3 113% when wind is in combination with other loadings. Allowable compressive stress shall be determined in accordance with ASME Section VIII, Div. 1, paragraph UG-23.

7.3.3

Horizontal vessels supported by t w o saddles shall be investigated according t o L.P. Zick method for calculating "Stresses in Large Horizontal Cylindrical Pressure Vessels on Two Saddle Supports," or BS 5500, Appendix G, as referred by ASME Section VIII, Div. 1,

7.3.4

Concrete-bearing stress under baseplates for vertical vessels and columns shall not exceed 5 Nlmm2.

Corrosion Allowance 7.4.1

The minimum corrosion allowance for carbon steel and low alloy vessels shall be 3.0 mm unless otherwise specified on the Drawing or data sheet.

7.4.2

The corrosion allowance shall be added t o both sides of tray support rings and other fixed internals when exposed t o corrosive liquids or atmosphere. Removable carbon or low-alloy steel internals shall have one half of the corrosion allowance added t o each side where exposed t o corrosive liquids or atmospheres.

7.4.3

The corrosion allowance for nozzles and manways shall be at least equal t o that specified for vessel shell.

Minimum Thickness 7.5.1

For vessels fabricated of carbon or low-alloy steel, the minimum shell or head thickness before corrosion allowance is added shall be the greater of 6.4 mm (for vessels outside diameter (OD) up t o 2700 mm) or Dl800 3 where D = nominal vessel diameter in millimeters (for vessels OD 2700 m m and above).

+

7.5.2

The thickness after forming of straight flange of dished heads shall not be less than the thickness of the shell course t o which it is attached.

Engineering Group

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7.5.3

The minimum thickness for ,high-alloy steel pressure containing parts shall be 4.8 mm.

7.5.4

Thickness specified on Drawings and documents for pressure parts must be considered as minimum design thickness. Account shall be taken of rolling tolerances, forming of different parts, etc. The final thicknesses used shall be the full responsibility of the Contractor.

CONSTRUCTION 8.1

Heads

8.1 .I Dished and flanged heads, or spun heads, shall be used except when flat or hemispherical closures are required t o satisfy a special design feature.

8.2

8.1.2

Semi-ellipsoidal heads are preferred. Torispherical heads with a distinct crown and knuckle radius (preferably 1 0 % of diameter), and dimensions within the design code, are acceptable.

8.1.3

The proposed head shapes, together with dimensional details, must be stated at quotation and on the working Drawings.

8.1.4.

Carbon and low-alloy steel, cold formed heads shall be normalised.

Nozzles

Electric Resistant Welding (ERW) pipe is not acceptable for nozzle necks. Seamless pipe shall be used for up t o NPS 1 6 in. Rolled plate may be used in lieu of seamless pipe subject t o full penetration welding and 100% radiography of the weld for NPS 1 6 in. and over. Flanges shall be forged welding neck type unless otherwise stated. Dimensions of flanges up t o NPS 2 4 in. shall conform t o ANSI B16.5 and t o ASME B16.47 Series A above NPS 2 4 in. Machining finish shall be in accordance with the Engineering Group Specification entitled "Piping Material Classes" (Number 0 1 5-LH-1001). Nozzle construction and materials shall be in accordance with the specifications and standards as listed on the Drawings and data sheets. Nozzle projection into vessel for the purpose of reinforcement is t o be avoided, unless otherwise required for process reasons.

Englndng Omup SpecJflcatbn

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01 6-CH-1001

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08-9-94

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Bolt holes in flanges shall straddle the vessel centre lines unless otherwise stated. Reinforcing pads shall be of the same material as the shell plates. A %-in. NPT threaded tell-tale hole shall be provided complete with a threaded plug, and used for air-testing the attachment welds. The edges of shell or head at the periphery of all nozzles shall be examined by ultrasonics for laminations before cutting and welding. Minimum nozzle connection to shell or head shall be 2-in. NB Nozzles less than 2-in. NB shall be swaged, incorporating a concentric reducer. Pipe sizes of 2%-in. NB, 3%-in. NB and 5-in. NB shall not be used. Instrument nozzles 2-in. NB and above shall be 300-lb rating minimum. 8.2.10 Studded flange connections (i.e., studding outlets) are not permitted. 8.2.1 1 Welding fittings shall be according to ANSI 81 6.9. 8.2.12 The flange neck thickness shall match the pipe schedule. 8.2.13 The minimum thickness of nozzle necks including corrosion allowance shall be the greater of that calculated by ASME Section VIII, Div.1, paragraph UG-45 or the thickness listed below: Carbon and Low-Allov Steel

8.3

a.

For sizes up to and including 3-in. NB, use schedule 160 pipe.

b.

For sizes over 3-in. NB up to 10-in. NB, use schedule 80 pipe.

c.

For sizes over 10-in. NB, use 13-mm minimum thickness.

Boltina and GaskeQ 8.3.1

Unless otherwise specified on vessel data sheets, bolting shall conform to the following minimum requirements:

Englneerlng Gmup SpecifictWn

8.4

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a.

External Bolting for Pressure Parts: studbolts t o ASTM SA-193 Grade 87, nuts t o ASTM SA-194 Grade 2H heavy hexagon.

b.

External bolting for stainless steel vessels shall also be of stainless steel material, e.g., A1 93 Grade B8IB8M and nuts t o A1 9 4 Gr.818M.

c.

Internal Bolting: bolts t o be ASTM SA-193 Grade B8 or B8C. Nuts t o be ASTM SA-194 Grade 8 or 8C unless otherwise specified. ASTM A307 Grade B shall not be used for internal bolting.

8.3.2

All studbolts t o be threaded full length. Thread form t o be Unified National Coarse (UNC) Series for bolts less than 1-in. diameter and 8-UN series threads for 1-in, diameter and greater.

8.3.3

Equivalent substitute material specifications are subject t o approval by the Company.

8.3.4

Gaskets for blanked connections shall be as specified on the equipment data sheet.

8.3.5

Spare bolting shall include at least 1 0 % stud bolts, nuts, washers, etc. of each (with minimum of t w o units).

8.3.6

The Contractor shall furnish t w o sets of spare gaskets for all blind flanged nozzles, manholes and shell flanges in addition t o erection gaskets t o be installed at the Site.

Manholes and Handholes 8.4.1

Manholes shall be 24-in. NB unless otherwise specified.

8.4.2

All manhole covers shall be provided with adequate davits.

8.4.3

Manways shall be located so as t o enable safe access and escape for maintenance personnel.

8.4.4

Gripping bars and rungs shall be provided at each manway t o provide access t o internals.

8.4.5

Horizontal vessels exceeding 6000 mm in length shall be provided with a minimum of t w o manways.

8.4.6

Only forged steel eye bolts shall be provided for davits.

8.5

External A t t a c h m m 8.5.1

Vertical vessels shall be provided with adequate lifting lugs t o facilitate handling during transport and Site erection. For large vessels, specific attention shall be paid t o the design of lifting lugs t o suit the Site lifting equipment.

8.5.2

All lugs shall be designed for 1.5 times the weight of the vessel.

8.5.3

Where vertical vessels have H-section stiffeners, the web shall be drilled with 14-mm diameter hole at 1000-mm spacings t o enable drainage.

All baffles, tray support beams or other internals spanning a chord or diameter of the vessel shall be provided with a means for allowing differential expansion between the part and the vessel shell. Internal non-pressure piping for carbon steel vessels shall be fabricated, as a minimum from extra strong seamless carbon steel pipe, conforming t o ASME SA-106-B or equivalent. Internal flanges may be fabricated from plate, For high-alloy or high-alloy-clad vessels, pipe and flanges shall be fabricated of the same material as the shell or cladding unless otherwise specified on the drawings and data sheets. Internal pressure piping shall be fabricated from forged flanges and seamless pipe t o the same specifications as the external connected pipe. All internals (fixed and removable) shall be supplied and installed prior t o shipment unless otherwise stated on the vessel Drawing. Unless stated otherwise on the vessel Drawing, baffles, demisting elements or weir plates shall not be welded directly t o the shell (or head) for vessels in hydrocarbon service, but shall be bolted t o support attachments which are welded t o the shell. Inlet nozzles shall be provided with impingement devices. The material of the impingement devices shall be as per the shell material.

8.7 31 2-0036

Skirts and SUDDO-

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8.7.1

Horizontal vessels shall be supported on t w o saddles.

8.7.2

Vertical vessels shall be supported by skirt, legs or lugs as shown on the vessel Drawing.

8.7.3

Skirt, saddles, etc., shall be designed t o withstand the imposed loads from future site hydrotesting.

FABRICATION

9.1

Welding All welding procedures shall be submitted t o the Company for approval before commencing fabrication. Welding procedure for stress-relieved vessels shall be based upon a maximum of t w o heating cycles, i.e., one time repair after stress relieving or hydrotesting; the same is applicable for vessels in packages. No welding shall be performed at an ambient temperature of less than 10°C, unless preheating is employed, as per code requirements. Only welders who are qualified in accordance with the ASME Code and the Engineering Group Specification entitled "Welding Procedure Approval and Welding Quality Requirements" (Number 015-WH-1001) shall be employed on the subject vessels. Seams in supporting skirts shall be full-penetration double buttwelded or equivalent. Connections between skirt and head shall be made with a smooth, flat-faced fillet weld, welded from the outside of the skirt only. No tack welds are permitted on the inside at the skirt-to-head joint. Size of fillet welds for all internal attachments shall include the corrosion allowance specified on vessel Drawings and data sheets, Internal welds for support rings and lugs shall be full penetration. All internal and external attachments shall be positioned so that the distance between fillet welds of these attachments and the pressure-retaining welds shall not be less than three times the vessel thickness or 5 0 mm, whichever is greater. Rectangular-or square-reinforcing plates and pads shall have 40m m radiused corners.

EngineerJng Qmup Specificatbn

Specification Number

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01 5-CH-1001

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08-9-94

Sheet 16 of 36

9.1.8 Backing strips shall not be used for any pressure vessels including packaged vessels. All seams in shell or heads shall be full-penetration double butt welds or equivalent.

9.1.9 All welding shall be in accordance with ASME Section IX and the Engineering Group Specification entitled "Welding Procedure Approval and Welding Quality Requirements" (Number 01 5-WH-

1001). 9.1.10 Where stiffeners are required by the codes for the vacuum vessels, they shall be continuous and preferably external.

9.1.I 1 The ring welds should be positioned at least 150 m m clear of circumferential seams, vessel's branches and other permanent attachments unless otherwise approved by the Company. Unless otherwise specified, stiffeners shall be welded t o the shell with continuous weld seams.

The extent of radiography shall be as specified on the data sheet. In no case shall the radiographic examination be less than spot radiography plus all butt-weld intersection T-joints. Radiographic examination of welds shall be in accordance with ASME Section VIII, Division 1 or 2, as applicable. X-ray equipment shall be used. The radiographic film used shall be of class 1 (low speed, very fine grain) or class 2 (medium speed, fine grain). Radiographic sensitivity shall be 2% or better as per SE-94 Article 2 2 of ASME Section V. In addition, the Company reserves the right t o radiographically examine and interpret the welds. For welds not meeting the codelspecification requirements, the repair and radiography of these welds shall be at the Contractor's expense. Defective welding disclosed by radiography shall be chipped out, rewelded and re-radiographed, plus any additional radiographs or tests required by the applicable design or construction code, by the Contractor at its expense.

9.3

Stress Relieving

9.3.1 Vessels shall be stress relieved when specified on the data sheets. In no case shall the stress-relieving be performed at less than the minimum temperature specified by the Code. Longer duration, lower temperature stress relieving as shown in

Group

Specification Number

Rev

Date

Sheet

01 5-CH-1001

1

08-9-94

17 of 36

Table UCS-56.1 of ASME Section VIII, Division 1 shall not be permitted. A procedure shall be submitted t o the Company for review and approval. All vessels shall be stress relieved as a complete unit. Any Brinell hardness tests shall be made after post weld heat treatment (PWHT) on weld heat-affected zones (HAZs). The results of the tests shall be recorded in the vessel fabrication records. Special consideration shall be given t o vessels in LT (low temperature) service and for cases where blowdown may occur in operation. All flange faces shall be suitably protected against oxidation during heat treatment. On vessels requiring full stress relief, all welding must be carried out before heat treatment. Any repairs required after completion of vessel PWHT or hydrostatic test shall be described in detail and submitted for the Company's approval, together with the proposal for subsequent vessel examination, PWHT and testing, before proceeding with such repairs. All repair work and examinations shall be in accordance with the requirements of ASME Section VIII, Division 1. After PWHT, the words "STRESS RELIEVED VESSEL, NO WELDING ALLOWED" shall be painted on the vessel shell in 100-mm-hig h letters. 9.4

Tolerances Fabrication tolerances shall conform t o ASME Section VIII, Division 1 and Appendix 4 of this specification unless shown otherwise on the vessel Drawing or data sheet.

10.0 INSPECTION AND TESTING 10.1 I n s ~ e c t i o ~

10.1 .I Inspection shall be in accordance with the provisions of paragraphs 6.1 and 6.2 of this specification. 10.1.2 The Company's inspector shall have free entry t o the Contractor's facilities while any work or testing are in progress on the Company's vessels. 10.1.3 Third-party inspection involvement shall be at the Company's discretion.

Ewneerlng Qmup S p ~ ~

Specification Number

n

01 5-CH-1001

Rev

1

Date 08-9-94

Sheet 18 of 36

10.1.4 Manway davitslhinges and hinge pins shall be in place before the vessel is tested. Covers shall be swung open to ensure that no binding occurs. 10.1.5 All acceptance Non-Destructive Testing (NDT) shall be carried out after PWHT. 10.1.6 An Approved Manufacturer's Quality Plan shall be submitted to the Company for its review and approval. 10.2 Tests

10.2.1 All tests and testing procedures used shall be in accordance with the applicable design code with any additional tests as may be called by the Company and in the data sheets. 10.2.2 All reinforcing pads are to be leak tested with air (1.0 barg) and soapy water after stress relief. 10.2.3 Ultrasonic testing and weld sampling, where required, shall be in accordance with the appropriate specification shown on the vessel data sheet. 10.2.4 Magnetic particlelliquid penetrant examination shall be performed in accordance with ASME Section VIII, Division 1. 10.2.5 Tubes and forgings (excluding flanges, blank covers, blocking rings and support rings) which have a thickness of 50 mm or above shall be tested ultrasonically as per ASME A388. Acceptance criteria shall be per ASME Section V. 10.2.6 Clad steel plates shall be tested as per ASME A578. 10.2.7 NDT for welded joints shall be as per ASME VIII, Division I,and ASME V, except as modified hereinafter: a.

The main seams of pressure vessels having thickness of 50-mm or above shall be supplementarily examined by ultrasonics.

b.

All main seams in ferritic steel vessels welded by the manual metal arc process shall be ground smooth on completion and submitted to wet magnetic particle crack detection.

c.

The main seams of all vessels constructed of alloy steels shall be 100% radiographed.

d.

Vessels requiring PWHT and 100% radiography shall be radiographed after heat treatment. Any radiography

-

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Englndng Gmup SpeMcathn

Specification Number

Rev

Date

Sheet

01 6-CH-1001

1

08-9-94

19 of 36

before heat treatment shall be at the Approved Manufacturer's expense. In vessels which are required to undergo PWHT, the attachment welds of branches larger than 8-in. NB and of manholes, shall be examined by a wet magnetic particle crack detection method after PWHT. For this purpose, the welds shall be ground sufficiently prior to PWHT to remove surface irregularities which could mask indications of defects. Where heads are formed in one piece from more than one plate, weld seams shall be fully radiographed before forming and, additionally, weld seams in the knuckle region shall be fully radiographed after forming. T- or corner-type butt joints shall be non-destructively examined for internal and surface flaws. Set-through nozzles made from rolled plate and with a wall thickness in excess of 19 mm shall be examined for laminations along the line of the attachment weld prior to welding. The complete length of all welds on lifting and tailing attachments (e.g., attachment to pad, pad to vessel, etc.) shall be examined by magnetic particle or dye penetrant method for surface flaws. The root pass and completed weld of all nozzle/shell attachments shall be examined by the magnetic particle method. Vessels requiring spot radiography shall have a minimum of 5% of the welds radiographed. Those radiographs shall include all the weld intersections. All vessels specified for lethal or sour service shall be 100% radiographed unless otherwise specified by the Company. In addition, all welds shall be examined by the wet fluorescent magnetic particle method to ASTM E709 and ASME Section V, Article 7. 10.2.8 Ultrasonic Technique for Nozzles Welds and Plates a.

An ultrasonic examination shall be made from the bore of nozzles exceeding 150-mm ID in shell plates having a 50mm thickness or more to confirm that full penetration

QKOC

Engineering Gmup spi?&htb

Specification Number

Rev

Date

Sheet

015-CH-1001

1

08-9-94

20 of 36

welds have been achieved and that no delamination of the nozzle has occurred. b.

When welds are examined by ultrasonic techniques, examination shall be performed in accordance with a procedure base on BS 3923 Part 1, and shall be subject to approval by the Company.

c.

Carbon and low-alloy steel plates having a thickness of 25.4 mm (1 in.) and above shall be tested by ultrasonic technique to ensure that they are free from gross internal discontinuities, such as ruptures, laminations and piping, or other detrimental defects. Testing shall be as per ASTM-A 435 or BS 5996.

10.2.9 Magnetic Particle and Penetrant Test a.

The magnetic field shall be produced by AC magnetic yoke or, subject to approval by the Company, by permanent magnets, techniques liable to cause arcing are not permitted.

b.

All internal and external welds of the nozzles, as well as all internal or external weld attachments shall be examined by the magnetic particle method. The penetrant test method shall be used for high-alloy and stainless steel vessel welds.

c.

For dye-penetrant testing of stainless steel, chloride-free material shall be used.

10.3 Vessel Hvdrostatic Tea 10.3.1 Hydrostatic testing shall conform to paragraph UG-99(c) of ASME Section VIII, Division 1. Calculations shall be made to determine maximum allowable working pressure. Design checks shall be made to prove that the stress in any section of the vessel during hydrotest shall not exceed 90% of the minimum yield stress at ambient temperature for the material used. 10.3.2 Equipment shall be designed to withstand future hydrostatic test pressure in erected position and in corroded condition with allowable stress not to exceed 90% of material specified minimum yield strength at ambient temperature. 10.3.3, Future Site test pressure shall be in accordance with paragraph UG-99(b) of ASME Section VIII, Division 1.

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Date

Sheet

01 5-CH-1001

1

08-9-94

21 of 36

10.3.4 The minimum metal temperature throughout the hydrotest shall be established t o ensure safety of the vessel, but shall not be less than 15OC. 10.3.5 Shop hydrotest water shall be potable quality. For austenitic stainless steel vessels, the testing water shall be demineralized water with 3 0 ppm chloride content maximum. 10.3.6 In the event of Site hydrotesting, brackish water shall be used in accordance with the Engineering Group Specification entitled "The Use of Brackish Water for the Site Hydrotesting of Equipmentn (Number 0 1 5-CG-1001 I. A pressure recorder with calibrated pressure charts shall be installed on the vessel during hydrotesting t o record the rate of pressurising, holding time and rate of depressurising. These charts shall be included with the hydrotest report. Calibrated gauges are required for testing. Both pressure recorders and gauges shall have a test certificate indicating that these instruments have been calibrated t o the relevant standards and specifications. Calibration shall be witnessed by the Company or a Company-nominated third party inspectorate. 10.3.8 The test pressure shall be held for at least 3 0 minutes per cm of thickness but in no case less than 2 hours. 10.3.9 For field-tested vessels as specified in section 10.0, the test medium shall be at a minimum temperature of 20°C unless otherwise agreed t o in writing with the Company. 10.3.10

Removable internal parts, e.g., demisting elements, baffles, etc., shall be installed only after satisfactory testing.

11.0 FIREPROOFING AND INSULATION

~

1 1.1 Where vessels skirts are t o be fireproofed as indicated on the Drawings and data sheets, W-in. square nuts shall be welded on a 450-mm triangular pitch t o the inside and outside surfaces of skirts as well as the exterior of the bottom head. Any variation from this requirement will be shown on the vessel Drawings and data sheets. 11.2 Where vessels are t o be insulated, a11 insulation support rings shall be supplied and %-in. square nuts on 450-mm triangular pitch shall be welded t o the outside surface of bottom head. 11.3 All interior studs, rods or clips for internal refractory or gunite linings, unless otherwise stated on vessel Drawings, shall be furnished.

Engineering Gmup

SpeMcahbn

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Date

Sheet

01 5-CH-1001

I

08-9-94

22 of 36

12.0 PAINTING Painting of pressure vessels shall be in accordance with the mechanical data sheets and Engineering Group Specification entitled "Shop and Field Painting" (Numbering 0 1 5-XH-1005). 13.0 MISCELLANEOUS 13.1 Service gaskets and bolting shall not be used for hydrostatic test but shall be suitably boxed and tagged for field installation. Gaskets of the same type as the service gaskets shall be used for the hydrostatic test. 13.2 All platform and ladder clips, davit brackets, pipe supports, etc., unless stated otherwise on the data sheets, shall be furnished. 13.3 Tall vessels which have safety relief valve greater than 2-in. NPS or having removable internals shall be provided with a davit arm. 13.4 Two earthing clips shall be provided on the vessel support. 13.5 The vessel shall be fitted with a stainless steel nameplate permanently attached by welding t o a suitable bracket which will locate the nameplate clear of any insulation. In addition t o data required by the ASME code, the nameplate shall include the Company's equipment number. 13.6 On completion of all work, vessels are t o be cleaned and dried out, flange faces t o be coated with grease or easily removable rust preventative. Prior t o shipment, nozzles are t o be fitted with bolted metal or wooden blanks t o protect the machined surfaces and screwed couplings are t o be fitted with plugs, t o prevent the ingress of dirt or moisture. 14.0 FIELD ERECTION 14.1 Where size or shape of vessel make it impossible t o ship in one piece for erection, the largest shop-fabricated sections suitable for shipment and ease of handling for field erection and assembly shall be shipped t o the Site. Design, fabrication, testing and inspection shall be in accordance with this specification. 14.2 Where size or shape of vessel are such that they must be shipped in sections or pieces for field erection, the following requirements shall apply: 14.2.1 All pieces shall be shop fitted-up into sections and each section fitted t o adjacent section and all pieces match marked.

-

Group

14.2.2 The width accordance procedures, tolerance of

Specification Number

Rev

Date

Sheet

0 1 5-CH-1001

1

08-9-94

23 of 36

of permissible gap during fit-up shall be in with approved shop Drawings and welding and shall generally be 3 mm maximum with a plus 1 mm minus 0.

14.2.3 Flame-cut edges shall be ground as required to remove slag and detrimental discoloration and to ensure smoothness and uniformity of edges. 14.2.4 All radiography requirements for welds completed in the shop shall be made before the part or section leaves the shop. 15.0 PACKING, MARKING AND DOCUMENTATION

For all relevant requirements, refer to the Engineering Group Specification entitled "Packing, Marking and Documentation" (015-UH-1001). 16.0 SPARE PARTS AND MAINTENANCE REQUIREMENTS

For all relevant requirements, refer to the Engineering Group Specification entitled "Spare Parts and Maintenance Requirements" (015-KH-1902). 17.0 SUPPLEMENTAL REQUIREMENTS 17.1 Reauirements for Wet Hvdroaen Subhide Service

All the requirements of NACE MR0175 (latest edition) shall be applied, when the vessel data sheet andlor specifications indicate the service environment to be sour. 17.1.1 Plate Materials a.

The following limitations on chemical composition shall apply: 1.

The maximum carbon content shall be 0.23%.

2.

Carbon equivalent to be computed from the following formula: CE

=C+h&+Cr+Mo+V+Ni+Cu 6 5 15

CE shall not exceed 0.43%. 3.

Plates having a thickness of 10 mm and above shall be ultrasonically tested for laminations in accordance with ASTM SA-578 Level 1.

Engineering Group

Specification Number

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Date

Sheet

01 5-CH-1001

1

08-9-94

24 of 36

SpeMctltbn b.

The following limitations on chemical composition shall apply: 1.

Sulphur content: maximum 0.007% (ladle analysis) 0.009% (check analysis).

2.

Phosphorus content: maximum 0.015% analysis) - 0.020% (check analysis).

3.

Rare earth metal are not permitted.

(ladle

17.1.2 Hardness a.

The maximum hardness of parent metal and welds shall be 235 HBN.

b.

Hardness measurements shall be made on the internal vessel welds. A minimum of one reading (including base metal, weld and HAZ shall be made on each circumferential weld and on each longitudinal shell course weld.

I

17.1.3 Pipes and Fittings Because of the significantly greater risk of crevice corrosion in sour service, the use of socket-welded fittings, screwed couplings or any other weld detail which could result in a crevice on the process side is not permitted. The use of ERW pipes is not permitted. 17.1.4 Welding

I

a.

Cr-112% Mo welding consumables and those having more than 1% Ni shall not be used for welding carbon steels.

b.

Weld repair of plate surface defects shall not be permitted without Company approval and shall be subject to Company approval of the Contractor's repair procedure prior to the work being carried out.

c.

All pressure vessels for sour service shall be stress relieved to ASME Section Vlll code.

17.1.5 NDT for Welded Joints a.

Except as otherwise specified by the Company, all pressure vessels specified for sour service shall be 100% radiographed. In addition, all internal weld surfaces shall

I

Engineering Gmup Specr7iatrion

Specification Number

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Date

Sheet

0 1 5-CH-1001

1

08-9-94

25 of 36

be examined by the wet fluorescent magnetic particle method. b.

Nozzles and manway attachment welds shall be examined by wet magnetic particle methods.

17.2 Metal Linina (Claddin@ 17.2.1 Pressure vessels constructed with corrosion-resistant integral cladding, weld metal overlay cladding or with applied lining shall generally be in accordance with the rules of Part UCL of ASME, Section VIII, Division 1 code and as modified hereinafter. 17.2.2 Cladding shall be integrally and continuously bonded onto the base metal and shall be obtained either by roll bonding or explosive cladding. Clad plates shall conform to one of the following specifications: a.

ASME A263

Corrosion Resisting Chromium-Steel Clad Plate, Sheet and Strip

b.

ASME A264 Corrosion Resisting Chromium-Nickel Steel Clad Plate, Sheet and Strip

c.

ASME A265

Nickel and Nickel-base Alloy Clad Steel Plates

17.2.3 Clad plate shall be used in preference to weld overlay. Proposals to use the weld overlay method shall need to be approved by the Company. When approved, the exact extent of weld overlay and the successful overlay procedure shall require Company approval. 17.2.4 Interior surfaces and flange faces of nozzles and manholes shall be of the same alloy as the cladding or weld overlay and made as follows: a.

Nozzles including flange faces shall be integrally clad or lined with deposited weld overlay.

b.

For nozzles of 3-in. diameter and smaller, a loose sleeve liner may be used subject to Company approval.

17.2.5 Nozzles shall be fabricated using combinations of cladding weld overlay or sleeve liner (when permitted by the Company) with deposited weld metal to provide continuity or shall be totally overlaid with deposited weld metal. Detailed Drawings showing fabrication of nozzle necks, attachment to vessel shell and

1

' Englndng Group

Specification Number 0 1 5-CH-1001

t

Rev

I

1

Date .. . .

08-9-94

1

Sheet 26 of 36

flange facings, shall be submitted to the Company for approval before the start of fabrication. 17.2.6 Welding of clad plates and weld overlays shall be as follows: Welding overlay and welds joining clad plate shall be qualified in accordance with ASME IX. Macro section with Brinell hardness indents shall be taken at three locations through the interface of the overlay welding. Hardness shall not exceed 310 HBN for non-sour service and 235 HBN for sour service. Austenitic weld overlay procedures shall be capable of withstanding the effects of possible sigma phase formation if heat treatment is to be performed. Weld overlay and welds joining clad plate shall be deposited in a minimum of two passes. The initial layer shall be deposited with a more highly alloyed welding consumable to take into account dilution with the base metal. The ferrite content of austenitic stainless steel weld metal deposit shall be determined by a calibrated meter or calculated by reference to the Schaffler-Delong Diagram. The acceptable range is from 3% to 10%. For depositing austenitic weld overlay or for joining austenitic stainless steel plates, the chemical composition of the final layer shall comply with that of the corresponding AWS consumable classification, except that type 304L cladding shall be joined with an AWS-ER308L or ER347 consumable. For joining ferritic stainless steel plates, AWS-E309 welding consumables shall be used. 17.2.7 The inspection and acceptance criteria for cladding shall be as follows: a.

Examination of the cladding bond shall be carried out in accordance with ASME A578 Supplement S7.

b.

Completed butt joints on the clad side shall be inspected visually and with liquid penetrant (dye penetrant) after hydraulic testing.

c.

The surface of each completed butt joint weld overlay shall be examined for chemical composition. The technique and the equipment shall be subject to approval by the Company.

Engineering Gmup specJfi&n

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08-9-94

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d.

At least one analysis check shall be selected for each 1.5-m portion of the production weld. The locations of the checks shall be specified by the Company. The chemical composition of the deposit shall comply with the requirements of paragraph 17.2.6 of this specification.

e.

Disbonding defects located by liquid penetrant or ultrasonic inspection that cannot be contained within a 25mm-diameter circle shall be repaired. Linear indications revealed by liquid penetrant on edges which have been prepared for welding shall be repaired.

17.2.8 The inspection and acceptance criteria for weld overlay shall be as follows:

a.

The overlay shall be examined for chemical composition in accordance with item(s) above in at least two points in each head, at least two points in each 3 m of shell and at least one point in a closing seam and each nozzle size. Such locations will be selected by the Company.

b.

The analysis shall be used to calculate the ferrite content of the deposit. Acceptable limit is from 3% to 10%.

c.

The surface shall be free from cracks and fissure defects. Any one circular defect shall not exceed 1.5 mm in diameter. The sum of the diameters of circular indications in any 90-mm diameter circle shall not exceed 4 mm or the minimum depth of the overlay, whichever is greater.

d.

All areas of weld overlay containing defects in excess of the allowable limits, or whole composition of ferrite content does not satisfy the requirements of this specification shall be repaired.

e.

Repair or rejection of rejects shall be at the discretion of the Company. As a minimum, repaired areas shall be inspected with liquid penetrant in accordance with ASME E165. Defect scope and proposed repair and inspection procedures shall be submitted to the Company for approval prior to carrying out the repair.

17.2.9 The inspection and acceptance criteria for nozzles shall be as follows:

a.

Clad nozzles purchased from other suppliers shall be ultrasonically inspected for integrity of cladding. Any of these nozzles with less than 90% bonded cladding or any unbonded area more than 600 mm2 shall be rejected.

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01 5-CH-1001

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08-9-94

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b.

Inspection of weld overlay shall be by the liquid penetrant method in accordance with ASME E l 65.

c.

All welds in sleeve linings of nozzles shall be tested with dry air (1.5 barg minimum) applied behind the linings using soap suds, after hydraulic testing. Any indication of air leakage shall be considered unacceptable.

17.3 Peauirements for Trav Installation

17.3.1 Tray details, including tray support beams, shall be designed to suit the size of the vessel, the operating loads and operating temperatures. All trays shall be designed for a maintenance load of 136 kgs (300 Ibs) concentrated at any point, and any other load indicated on vessel Drawings or as defined in paragraph 17.3.2 below. 17.3.2 Trays or tray decks shall be designed for a uniform live load of 49 kg/m2 (10 psf) or the weight of water at the maximum weir setting whichever is greater. Areas below downcomers shall be designed for a uniform live load of 313 kg/m2 (64 psf) or a liquid load of water equal to one-half the height of the downcomer, whichever is greater. 17.3.3 The maximum total support beam deflection for the specified loading shall not exceed LI900 or 4.8 mm (3116 in.) whichever is smaller, where L is the length of the support beam. 17.3.4 The upward thrust due to vapour flow may be taken into consideration for cases where the liquid load is 59kglm2 (12 psf) or greater, provided sufficient information is available to accurately predict the amount of upward thrust. 17.3.5 Trays shall be provided with internal tray manways to provide access to all parts of the trays. Tray manways shall be approximately aligned vertically and shall be operable from both top and bottom sides. Small tray sections may be used for manways. 17.3.6 All removable trays shall be in sections which can be removed through the vessel manway. This type of tray shall be supported by a bar-type tray support ring. All tray and downcomer sections shall be securely clamped or bolted to the support rings, bolting bars and truss members, and sealed with a suitable gasket when, or where or as required. 17.3.7 Details of clamps and bolting shall be included in the tray Contractor's Drawings. Wedge-type tray and cap hold-downs

Specification Number

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Date

Sheet

01 5-CH-1001

1

08-9-94

29 of 36

Gmup S~eMcatbn -----

-----w

shall not be used unless specifically requested on the Company's vessel data sheets.

17.4 Identification 17.4.1 All material supplied shall be easily identified by indicating the order references and item numbers in white paint on:

a.

Vessel shell.

b.

Parts and accessories delivered separately.

c.

All additional packages.

Englnedng Gmup SpmcaMn

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01 5-CH-1001

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APPENDIX 1 GRAPH FOR DETERMINING PERIODIC TIME T AND LIMITS FOR STATICIDYNAMIC DESIGNS OF COLUMNS

NClTES:-

H W D L

-

-

UNCORRODED SHELL THICKNESS (MM) UNIT ERECTIONWEIGHT polu]

COLUMN DIAMETER (M) LENGTH OF COLUMN ABOVE HORIZONTAL P U N € UNDER CONSIDERATION

1HE COLUMN SHOULD BE DESIOJED

1 '

DYNAMICALLY IF THE WTERSECTiON Of */+I AND '/a- IS ABOVE THE HEAW LINE

2

FOR q0< 15 STATIC DESIGN WIU. NORMAUY BE ADEQUATE

3

THEORETICALLY 7'WILL VARY W W THE COLUMN CONDITIONS FOR DETERMINATION OF STATIC OR DYNAMlC DESIGN REQUIREMENTS. COLUMN ERECTION CONOITIONS TO BE USED.

Engtneerfng Group Specification

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01 5-CH-1001

1

08-9-94

31 of 36

APPENDIX 2 NOZZLE LOADS FOR VESSELS (HORIZONTAL AND VERTICAL) 1.0

GENERAL 1.I The criteria specified shall apply to nozzles above 2 in. NB for vessels constructed of steel or alloy steel.

2.0

1.2

Nozzles shall be designed to withstand forces and moments from the thermal expansion and dead weight of piping. Piping reactions shall be computed in conformance with ANSI B31.3 and shall be designed within the limiting criteria set by this standard.

1.3

The forces contained herein are considered minimum criteria in order to allow for an economical design of the connecting piping.

EXTERNAL FORCES AND MOMENTS ON NOZZLES 2.1

Each nozzle shall be capable of withstanding forces from external piping under the design conditions and considered to be acting at the intersection of nozzle and shell in corroded condition.

2.2

The value "D" in the formulae below is the nominal nozzle diameter in inches. The 13-values in the formulae depend on the rating of the nozzle flange and are as follows:

Flanae Ratina

I

Class 150

Columns and Drums 0.6

I

Class 300 Class 600

2.3

I

1 1

I I

0.7 0.8

Class 900

0.9

Class 1500

1.O

Nozzle in Shells Longitudinal bending moment

ML = 13.130.D2 Nm

Circumferential bending moment

M0 = 13.100.D2 Nm

Resultant bending moment Mb = (ML2 Torsional moment

+~e')

= 13.1 64.D2 Nm

Mt = 13.1 50.D2 Nm

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Engineering Gmup Specification

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Rev

01 5-CH-1001

1

Date

08-9-94

Sheet

32 of 36

APPENDIX 2 Longitudinal shear force

FL = 13.2000.D

N

Circumferential shear force Fa = 13.1500.D N Fr = (FL' + ~ e ' ) % 13.2500.D N FA = 13.2000.D N

Resultant shear force Axial tension or compression force

-

Nozzles in Formed Heads Resultant bending moment Mb =

(MX'

+ MZ')

= 13.1 64.D2 Nm

Torsional moment

Mt = 13.150.D2 Nm

Resultant shear force

F (FX'

Axial tension or compression force

-

r

+ FZ')'

= R.25OO.D N

FA = 13.2000.D N

The above-mentioned loading shall be considered as being caused by 67% thermal and 33% dead weight load. These are piping loads onto the vessel. Pressure forces will be negligible. The basic stress intensity limits shall be as per ASME Section VIII, Division 2, Appendix 4.

3.0

-

ADDITIONAL REINFORCEMENT 3.1

Whenever stresses based on paragraph 2.0 exceed the allowables, the Contractor shall apply a reinforcing pad.

3.2

Actual nozzle loadings from connected piping shall be submitted to the Approved Manufacturer when calculated loadings exceed those set forth in paragraphs 2.3 and 2.4 above. In this instance, the actual loadings and the proposed measures to be taken to incorporate these loads within the vessel design shall be submitted for Company approval.

APPENDIX 2 NOZZLE LOADING GEOMETRY

cv cnr

aa mcnE

0 P 0

Shop Hydrote st Notes:

Uncorro ded

1.

2. 3. 4. 5. 6. 7.

90% Y.S(1)

-

X

-

x

(3)

Ambient

-

-

Per ASME

-

-

In tension (100% for austenitic stainless steel), in compression per ASME at ambient temperature. During hydrostatic test, 50% of the wind pressure must be taken into account. Hydrostatic test pressure (see paragraph 10.3). Design pressure for corresponding case. Piping loads or other appurtenances. In compression ASME stress at design temperature. Other load checking may be necessary t o cover following cases: fabrication, heat treatment, shop horizontal hydrotest, lifting, shipment and load-out. During lifting special consideration shall be given to tower appurtenances lifted with the column.

015-CH-1001 REV. 1

08-9-94

APPENDIX 4 PRESSURE VESSEL TOLERANCES

QKK

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01 ~-CH-IOOI

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APPENDIX 4 PRESSURE VESSEL TOLERANCES

Englneerlng Omup Specriricatjon

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01 5-CH-1001

I

06-9-94

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APPENDIX 4 TOLERANCES

REFEREHCE WE I

.

- HORIZONTAL VESSELS

COW-SEE TABLE BELOW \

PERMlSSlEKE ROTATlONOF: F W E WITH RESPECT TO VESSEL CWTREUNES NOTES: 1 ~ I D N O F ~ Y s ~ 0 1 T w tNi WE OR WSSELCENTRE LINE 2. FUX€FACEQtAWWYStiAlLBE mRIUUWITb4MWIUIU)PUNE MTHlnlK'

3. L~~TO((TMOZZUSFIIOUM~W~~

APPe~mx'0' ae-a-1-4 ----C

-

TOLERANCES HORIZONTALVESSELS

pwe 2

OF.?