Volume-2 Api510 Exam
VOLUME - II
STUDY OF CODES AND STANDARDS
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1. ASME SEC. VIII Drv.1 Pressure Vessel code
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2. API 510 Pressure Vesse! Inspection code
3. API RP 572 Recommended
4. API RP 576 Pressure Reliving Devices 5. ASME Sec. IX Welding Qualification Code
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API -. 510 COURSE NOTES
VOLUME - I I
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ASME See, VIrI
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STUDY OF ASME See. VIII Div. 1
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AS~1E BOILER & PRESSURE VESSEL CODES
INTRODUCTION TO ASME SECTION VIII DIV.
OF PRESSURE VESSEL
NDE OF PRESSURE VESSELS
CODE STAMPING AND REPORTS
TOPICS FROM ASME SEe. VIII ON. 1 FOR
NUMERICAL QUESTIONS IN API-SI0
ASME BOILER & PRESSURE VESSEL CODES
ASME Codes give stipulations and guidelines for !he design, materials, manufacture and testing of pressure vessels. These are issued by the American Society of Mechanical Engineers, New York. The codes were first issued in 1915. Since then, many changes have been made and new sections added to the code as need arose. It is a LIVE code and is revised and updated periodically. It keeps pace with time and is responsive to its users.
2) CODE SYSTEM In its present from the ASME Code System is a follows: Section I Section Part Part Part Part
" Power Boilers.
II A B C D
Material specifications. Ferrous materials, Non Ferrous Materials Welding rods, electrodes, filler metals. Material properties.
Section 111 Nuclear Power Plant Components. Section IV
Section V Non destructive
Section V/ Care and operation of Heating Boilers. Section V/I Rules for care of Power Boilers SecUo" VII/
Division 1 - Pressure Vessels Division 2 Alternative Ru!es ( Pr Vessel) Division 3 Rules fer constructive of High Pressure Vessels \fl'e/ding and Brazing Qualifications r--'~)er glass reinforced Plastic Prc:s::;urc \ '.':;sols
, ,':S for in I'
:iCI ;Jlan( COlflrOllcnts
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of all Sections
three years on 1" of .July of the year 01 issue.
was issued on : 1sl July 2001. Addenda issued on 1sl July every year.
to the latest edition
2001 Edition with 2001 Add. _ 1sl July 2001 . st
. 2002 Addenda
- 1 July2002 .... (A 02)
1sl July 2003 ..... (A03)
A fully revised edition incorpOraling issued on 1sl July 2004.
all above addenda
The editions and addenda become applicable
after six months
from date of issue. Thus, for 1" Jan. 2004 to 31 Jan,200A,
construclion of Pressure Vessels shall be as per 2001 edition 1 and 200 +2002 addenda. However, for old C ;)
Compliance of all requirements (ie. Vendors)
of Code by himself, and by all others
(b) (c) (d)
Providing proper certification of materials and construction. Providing applicable design calculations. Establishing a mandatory Quality System.
(a) (b) (c) (d) (e)
Monitoring quality control. Verification of design calculations. Conducting specified inspections. Code stamping. Certification.
The code content is organised in 3 sub-sections i) Sub-section A - General Requirements
ii) Iii) IV) v)
) ) ) )
Sub-section B - Requirements Sub-section C - Requirements Mandatory Appendices Non-Mandatory Appendices
and two Appendices
pertaining to methods of fabrication pertaining toclasses of materials
Desiqn The User shall assure vessel.
will be suitable
that the design.
for Intended of satisfactory
(jetC:'flOratlon during t:le vessel's
of the intended
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safety" (previously 4, prQ~ently 3.:5) is ddQr.:.~(.;
;.::' :.a'-l.ecare of the incidental
material abuse: during construction and serviCE:. > )
General Principle: .
A vessel may be manufactured by any process which shall not unduly impair the inherent material properties or jeopardize tl1e safe, reliable and optimum performance of the vessel.
Methods of fabrication: requirements are Getailed in subsection B UW for welded vessels UF for forged vessels UB for brazed vessels ULW for layered construction [Alternative Rules] ReqUirements based on materials:
Requirements based on materials adopte-J and other specifications are referred to in the following clauses of
subsection C of the ASME Code Section VIII
Divn.1. The stress values have been tabulated in the Part '0' of Section II. UCS UH.~ UNF UCL
for for for for
Carbon and low alloy stecis high alloy (stainless) steels non-ferrous materials clad materials
UHT for high tensile, heat treated Ferritic Steels (such as Q & T) UCI & UCO - for Cast Iron & Cast Ductile Iron Steels. UL T for low temperature appliC3tion using materiais of higher permissible stress values
COMMON ASTM SrECS. FOR C.S. PLATES
Composition % C
En~~. properties Mn
58 - 80
55 - 65
55 - 75
60 - 80
70 - 90
fiO - 80
70 - 90
Steel for Bending
may be ordered
(Low & Med
as rolled or norm
T. S )
(P V plates, Low & Med. T. S)
Plates >= 2" thk Must be normalized for < 2" purchaser's (P V plates, High & Med Temp service)
f'lates >= 15" ttlk Must be normailled for < 1 5" purchaser's V plates, Moderate & Low Temp service)
not to excecc1 spcclflerJ
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SELECTION OF CARBON & ALLOY STEELS SERVICE TEMPERATURE
STEEL TYPE ~
C - Steels
SA 285 grC (3/4 in. thk max)
SA 516 All Grades
C - 1/2 Mo
SA 204 gr 8, C
C - 5/4 Mn - 1/2 Mo
1/2 Cr - 1/2 Mo
SA 302 gr 8 SA 387 gr 2 1000 (max)
,, , ,
1Cr - 1/2 Mo
SA 387 gr 12 1100 (max)
1/2 Mo - Si
SA 387 gr 11 1150 (max)
9/4 Cr - 1 Mo
SA 387 gr 22 1200 (max)
LOW TEMP 8.
C - Steel (F. G.)
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5/4 Ni Steels
7/2 Ni Steels
SA 516 A.II Grades (Impact tested) SA 203 gr A or 8
875 (max) 875 (max)
SA 515 All Grades
TYPICAL TEMP. LIMIT (DEG. F)
SA 203 gr C or 0
( -50 )
( -90 )
( -150 )
9 Nr Steel
SA 353 ( -320 )
SS S/\ 240 Type 304.3041,347
( -425 )
MA TERIAL REQUIREMENTS:
•• •• ••... 1/
to stress due to pressure
of ttle specifications
given in ASME Code Section
in the applicable
parts) shall conform
II, ,md shall be limited to those that
Part (such as UCS,UNF,UHT
etc.) of the subsection
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for Plates, Forqinqs,
and Bars are covered
and SB for nonferrous
by a suffix SA for ferrous
or not recognized
are to be identified
of the Specification
and grade are
as required by the relevant
is not available,
can be ascertained
or is certified
Sect. VIII Div I, may bs accepted
out on representative
to a Specification
In such cases Vessel or part manufacturer
to the Specification
I tests are carried
needs to re-certify
and grade, based on the findings.
for these II Part D _
with, before correlating
These are designated
and verified whether
Pipes & Tubes,
in the ASME Code Section II Part A (for ferTous materials)
& Part 8 (for non- ferrous materials). materials,
II Pari C
S:::.:\ or SFl3 for sUltat)le classification
with a suffi\:
Paris when made
U2. with .For welding
jf done as per the app.licable Consumable
one should refer to applicable General Material
here for understanding
only. For specific
code book and addenda.
( ASME Section
Plates Castings Forgings
Pipes & Tubes (SA 106/312) (SA 179/213) I=asteners (SA 193/194/307)
(SA 515/516/240/285) (SA 216/351/217/352) (SA 181/105/182 etc.)
Bars & Shapes (Sections)
Max. Allowable MASVs
are given in ASME Section 11- Part D.
f~or vessels designed Deg F is used
II Part C )
Forms and Typical Specifications
a) b) c)
Steel & Low Alloy Steels with max. 0.35% Camon High alloy steels ( stainless steels and alloys) Non ferrous (AI, Cu, Ni, Cu Ni, Ni Cu etc.)
b) c) d)
of the materials,
in lieu of Certified Test report.
at low temperature,
over and above tile thicknesses
the MASV at 100
to be made
Use of Structural Steels for pre$su,-e parts (Typica!ly. SA 36/ SA 283 ) a)
not pennitted for lethal service
should not be used for unfired steam boilers
Design temperature only (-) 20 Deg.F. to (+) 650 Deg.F.
for thicknesses below 5/8" (160101) only
Testinq: Each plate to check test for chemistry and physical properties. ( Tensile strength, Y.S., % Elongation and severe Bend test as per SA-6 requirements ).
a.Check Tests for materials used for pressure parts
Check test allowed only in the case of partial identification:
Check test requirements :Each piece is tested for chemical properties. Acceptance
criteria as per pemlitted specification
which the material is being qualified. Cast, forqed, rolled and die-formed pressure parts: These shall be made from materials of permitted specifications; meeUor be suitable for design conditions of completed vessel.
and Heat treatment (Nonn/SR) as applicable must be conducted prior to its release for attachment to the pressure vessel. Partial data report (form U2)
needs to be issued for such components.
in ev:dence of code compliance.
Plates with 0.01 inch or 6% under tolerance (whichever is smaller) may be used for full desigr. ~ressure, However If material specification
allows greater under tolerance
3mm for a 10mm thick plate), then ordered thickness for the matenal
suffiCiently 0.006L) t,
P x L x M / (2SE - O.2P) or P == SEt / (LM + O.2t)
where L M
inside spherical crown radius 1/4
x [3 .r
+ (L / ==
r ) 1/2
is the inside knuckle radius in inches.
Knuckle radius shall nol be less than 6% of inside crown radius [ Ri ], nor less than three times knuckle thickness.
For Hemispherical Heads:
Ri shall be less than Do.
The formula Hemispherical shell can be adopted
'E' referred to above are chaned out in T2ble UW-12 as
:opplicable to weld jOints completed by an arc or' gas welding process. Joint efficiency
depends on Ihe Iype of joint and on Ihe degree of radiography
-2Xamlnatlon of the jOint. Table UV"'~2 of ASME Code See. Viii Div. 1 details !Olnl deSCriPtion, IIOlilations, JOint categories and degree 01 rOdiography ·::examination for each type number [Type 1 to Type 6 ) of the \','eld seam. Fig .':'/V·3
locations of Categories A, G, C & D
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Formed Heac.s, Pressure on Convex Side, The
tori spherical thicknesses a)
at the thinnest
point after shall be
of ellipsoidal, the
The thickness as computed for heads with pressure on the concave side as given in (13) above, and,
Thickness as computed by the procedure given in UG-28 and Mandatory Appendix-5 for Heads.
Minimum Thickness of Unstayed Flat Heads and Covers: t,
x [ CP I SE ]
= a factor depending upon the method of attachment o = Inside diameter of shell inches.
formula is applicable
to both welded
applied to the cover
of the flat head
and bolted by bolting,
are to be
Openinqs in Pressure Vessels:
Shape of the openings:
Openings in cylindrical and conical portions of"
vessels, or in formed heads, shall preferably be circular, elliptical or
obround. Openings of other shapes shall be provided with a suitable radius at all comers. b)
Size of the openinqs : Properiy reinforced openings, in cylindrical shells of diameter of upto 60 inches, shall not exceed half the vessel diameter, and in any case not over 20 inches. For vessel diameter of over 60 inches, the openings
shall not exceed 1/3rd the vessel diameter and in no case
eXceed 40 inches. For larger openings, supplemental rules apply. 18)
of Openirlqs :
required f~in!:]sifls!lell~_§ ~ ~
for shell side of fixed tube heataxchangers;
other exceptions are detailed in ~G-46 C, 0 & E.
for sizes of mandatory inspection openings: see UG-46F.
Permissible Out-Of Roundness for Shells and Formed Heads:
For internal pressure, (Oi Max - Oi Min) divided by Oi Nom = 1% Max. For external pressure, Refer Fig.UG-80.1 : Max. plus/minus deviation' e', from true circular form, shall be between 0.020 t to 1.0 t, as plotted on the
curves with Do / t on Y axis a,nctu Do on X axis, where L = design length. Heads: out of profile + 1 1/40/ _ 5/8 0 for Hemispherical Head, use L=0.50 in the ratio UOo.
Welded Joint Efficiency Values (UW -12)
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Type of joint and radiography
Efficiency allowed percent
1) Double-welded butt joints (Type 1)
Fully radiographed Spot-radiographed No radiograph
2) Single-welded butt joints (backing st;-ip left in place) (Type 2) Fully radiographed Spot-radiographed No radi8gr2ph 3) Slr1gle-welded butt jOints (Type 3)
90 80 65
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1. GENERAL (UW - 26)
(a) The rules in the following paragraphs apply specifically to the fabrication of pressure vessels and vessel parts that are fabricated by welding. These shall be used in conjunction with the general requirements for Fabrication
A, and with
Subsection C that pertain to the class of material used. (b) Each Manufacturer or parts Manufacturer shall be responsible for the quality of the welding done by his organization. He shall conduct tests not only of the welding procedure to determine its sUitability to ensure welds 'Nhich will meet the required
tests, but also of the welders and welding
determine their ability to apply the procedure properiy. ~ . (c) No production welding shall be undertaken until after the welding procedures which are to be used ,have been qualified. Only welders and welding operators who are qualified in accordance with Section IX shan be used in Production. (d) Welders not in the employ of the Manufacturer (Certificate of Authorizatr;~ Holders)
be used to fabricate
accordance with this Division, provided all the following conditions are met.
All COde construction shall be the responsibility of the Manufacturer.
All welciing shall be performed in accordance with the Manufacturer's welding
vvhich have been qualified
Manufacturer in accordance with the requirements of Section IX. (3)
4 ( )
All welders shall be qualified by the Manufacturer in aCQxdance with the requirements of Section IX. The Manuf8cturer's Quality Controi Sysiern shall include as a minimum: (0)
a reqlcirement for complete and exclusive administrative and technical supervision of all welders by the Manufacturer;
evidence of the Manufacturer's authority to assign and remove welders at his discretio:l without involvc:rnr:nt of
other or!C3ni?3!i n,: r
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a requirement for Assignment of Welder Identification sy1!111bQts:
evidence that this pro~ram has been accepted by the Manufacturer's
Authorized Inspection Agency which provides the inspection service. (5)
The Manufacturer shall be responsible for Code compliance of the vessel
or part, including Code Symbol stamping and providing Data Report
Forms propeny executed and countersigned by the Inspector.
2. QUALIFICATION OF WELDING PROCEDURE (UW-28)
Each procedure of welding that is to be followed in construction shall be recorded in detail by the manufacturer.
The procedure used in welding pressure parts and in joining load-carrying
nonpressure parts, such as all permanent or temporary clips and lugs, to
pressure palis shall be qualified in accordance with Section IX.
have essentially no load~carrying function (such as extended heat transfer surfaces, insulation support pins, etc.), to pressure parts shall meet the
following requirements. (1) When the welding process is manual, machine, or semiautomatic, procedufE~/
The 'procedure used in welding non pressure-bearing attachments which
qualification is required in accordance with Section IX. (2) When
with a Welding Procedure Specification
Section IX as far as applicable), required .
(in compliance with
testing is not
Welding of all tes~ coupons shall be conducted by the Manufacturer. Testing of all test coupons shall be the responsibility of the Manufacturer. Qualification of
welding procedure by one Manufacturer shall not qualify
that procedure by one Manufacturer except as provided in QW - 201 of Section IX
3. FORMING SHELL SECTIONS AND HEADS: Thr: following
shall apply in addition
to the general
rules for fanning
and low alloy steel plates shall not be formed cold by blows.
heads, and other pressure
alloy steel plates fabricated
and any of the following
parts of carbon
by cold forming shall be heat treated subsquently
fiber elongation conditions
is more than 5% fonn the as-rolled
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(1) The vessel
(2) The material
(3) The thickness , (4) The reduction
either liquid or gaseous
of the part before cold fonning exceeds by cold forming from the as-rolled
(5) The temperature
of the material
5/8 in. (16 mm).
is more than 10%.
during forming is in the range of 2500F to 9000F (
121°C to 482°C).
~ The extreme
shall be detennined
by the following fonnulas
~ For double curvature
% extreme fiber elongation
(75t1R) (1 - Rtr)
~ for single curvature
% extreme fiber elongation
tlR) ( 1 - Rtr)
'~ T = plate thickness,
Rr = final center line radius in.
R = original VVhen 'lesser
center line radius (equals infinity for flat plate), in
heads, or other pressure
alloj' steel plate are cold formed by other than the Manufacturer
for tll8 pari sllalllndlcate
paris of canJon or low of the vessel,
wllCther or not the pari
'3 ') '.
4. GENERAL PRECAUTiUj\lS IN FABRICATION I.
should be avoided. Square comers
should be fOunded off before fitment and welding . Unweldeci faces offlame cut edges should be ground smooth and sharp edges ground round. ii.
Welding of minor items direct to structural and pressure parts should be avoided. Use of intermediate I doubling pad is preferred.
Toes and brackets and ends of stiffeners should land on stiffened plating Fillet welds should be carried around attachments to avoid points of stress concentration.
progress towards free edges all the time to avoid shrinkage stresses. VI.
Back step welding, s~ )
materials given beIIJ'.'.',PWIIT !lccomcs 111211-::::,01\ above nominal
For carbon steels, nominal t~ickness above 31.i'5mm
For low alloy steels ot grades 1 Cr 1/2 Mo, 2 1/2 (.r.-1 Mo etc., at nomin~l_ thickness above 16mm, and for grades such as 5 Cr. 1/2 Mo and 9 Cr. 1 Mo. PWHT is required for all thicknesses.
For austenitic stainless nor prohibited.
steels [Type 304,316, etc.] PWHT is neither required
PWHT is normally not necessary nor desirable,
except for alloys like CDA-954, Zirconium grace R60705 alloy N08800, etc. For UHT materials (territic steels with enhanced tensile properties], PWHT is required tor all thicknesses.
TABLE UCS - 56 POSTI'JELD HEAT TREA Trv,ENT REQUIREMENTS FOR CARBON AND LOW ALLOY STEERLS
I Normal I
Minimum Holding Time at Normal Temperature For Nominal Thickness [See UW - 40(f)]
Holding Temperature, OF, Minimum
Up to 2 in Over 2 in to 5 ir 1 hrlin., 15. 2 hr plus 15 min minimum mln for each additional inch lover 2 in None None
P - No. 1 11100 Gr. Nos. 1, 2, 3 Gr. NO.4
Over 5 in 2 hr plus 15 min for each additional inch over 2 in -~~one
When it is impractical to postv.'eld heat treat at the temperature specifi~d in this Table,
to carry out the postv,teld heat treatment
temperature for longer periOds of time in accordance (.
Post\'/eld ilcat treatmcnt (e')
for welcjed Joints over
T;Jble UCS _ 5G 1
rnanciatory under the following condltlollS .
(b) for welded joints over 1 1/4 in nominal thickness through 1 1/2 in nominal. thickness unless preheat is applied at a minimum temperature of 2000 F during welding.
(c) for welded joints of all thickness if required by UW _ 2, except postweld heat treatment is not mandatory under the conditions specified below:
for groove welds not over 1/2 in size and fillet welds with a throat not over 1/2 in that attach nozzle connections that have a finished inside diameter not greater than 2 in.
is defined in clause No. UW-40(f) of ASME Code Section Viii
Div.1. For pressure vessels or parts thereof, it is the greatest weld thickness of the equipment or part of the equipment which has not been previously post weld heat treated.
Thus, the nominal thicknesses in the following cases are: 1.
In a full penetration weld joining materials of same thickness, it is a total depth of the weld, exclusive of any permitted weld reinforcement.
In groove welds, norn;nal thickness is the depth of the groove
In a groove and fillet type of weldment, nominal thickness is the depth of the groove, or the throat thickness of the fillet, whichever is greater.
In a fillet weld, nominal thickness is Its throat dimension.
!n stud welds, nom. thickness is the diameter of the stud.
When parts of unequal thicknesses thickness is,
are Joined together,
then the nomin2!
· thinner of the adjacent parts butt welded. · the thickness of the shell in a corner joint · th~ de~th of actual \,/cldment acros~ the nozz:e neck, includlrlg througll the r"ernforcement pa(j " tl18 thickness of tile n~nl.le fleck
butt welded to a Weld Neck FIClnge
The PWHT can be r:-presented as a time and temperature cycle, recordf'd on a chart. The heating and cooling rates as well as the soaking temperature and its holding time are important, and are specified in the Tables above.
should be performed preferably by heating the equipment as a whole in an
furnace. The equipment may be heated in more than one heat in a furnace,
with an ovenap of atlas 5 feet of the heated sections of the vessel shall be provided. At
the same time, the portion outside the furnace shall be shielded in such a manner that
temperature gradients are not harmful.
Local postweld heat treatment , for example, of a heavy section, or a circumferential
seam individually, may also be done in more than two or three heats, provided the
from likely harmful temperature gradients. In such cases, the heated band on either
side of the locally heat treated area shall be atleast twice the thickness of the shell.
heating is done uniformly and the portion outside the heated band is suitably protected
and low alloy st-2-2!s, the maximum heating rate is specified
hour per inch ~~:·:·~-~ss. ·...~i!e the maximum cooling rate allowed, after the
soaking period, is 278 Deg.C
hour per inch thickness.
The maximum loading and unloading temperatures should preferably be 300 Deg.C., to
avoid thermal shock, though a temperature upto 400 Deg.C. is allowed by the Code.
The minimum holding temperature,
or what is known as the soaking temperature,
varies for different types of materials, designated by ~p Numbers in ASME Code. For
carbon steels the minimum soaking temperature is 593 Deg C. For low alloy steels the
soaking temperatures ranges from 630 to 720 Deg C, depending upon the content of Cr & Mo
The spatial variation in holding temperature
during soaking period in a furnace or
heating chamber, should not be more than 30 degrees betwepn the highest and lowest temperature, throughout the portion of the equipment being heated. The Code however allo\\'s a difference of upto 83 Deg C
~:'~atl"lg ::;nd ho:r!in~; periods
as to avoid
direct flame impingement
of the vessel Bumer
~hOLiid bE: ~~)
on vessel surface.
Relieving of locked
up stresses in weldments, dispersal of peaks &
valleys of stress levels homogeneously in a welded structure, and affording dimensional stability.
) ) ) )
Tempering: Softening hard zones, such as at HAl and in cold formed components
escape route 10 nascent Hvdroaen entrapped
in welds, thus preclUding
possibility of underbead cracking. All of the above assure a safe and reliable welded equipment.
lOW-alloy steel seams
must be postweld
1 1/4 in or 1 1/2 in if preheated
must be postwe!d heat-treated
Unfired steam bailers
at lower thickness.
must be postweld
(oP more than 50 psig)
For welder vessels the details of PWHT describe in fOllOWing table of the code. and low-alloy
to 200' F before welding.
Carbon-steel vessels for service at lowered temperature treated unless exempted from impact test.
must be posrNeid
UHA-32 3. PRESSURE
A) HYdrostatic Tesl
be al leasl
1 3 limes
multiplied by the lov;est ratio of the stress value for the test temperature for the design ternperature
pressure to that
If the allowable sircs$ at design lerr.i)erature is less than the allowable stress at
test temperature the hydros;tatic test pressure must be increased proportionally.
Test pro = 1.3 x MAWPX
Allow.stress at test temp. AlIow.stress at design temp.
Inspection must be made at a pressure not less than Test pr.divided by 1.3.
may be considered
maximum allowable working pressure may be assumed to be the same as the
design pressure when calculations are not made to determine the maximum allowable working pressure. Max.lnspection temp. = 120 dec F,.
Test gauge range limit = 1.5X Test Pr: = 4X Test Pro
:) :) )
Min. Test temp.= MDMT+30 deg.F
(Minimum) ( Maximum)
Pneumatic test may be used instead of hydrostatic test when: Vessels are so designed dndsupported
thai they cannot safely by filled with
water.and Vessels for service in which traces of testing liquid cannot be tolerated Prior to Pneumatic test, Testing of attachment wells asper WU-50 must be performed
must not be less Ihan 1.1 limes maxImum allowable working
pressure multiple by the ratio of stress value S for test temperature oi vessel to ~ ) )
the stress value S for design temperature.
Min. Test temp.= MDMT +30 deg.F
The pressure in the vessel shall be gradually increased to not more than onehalf of the test pressure. Thereafter, the test pressure shall be increased in steps of approximately one-tenth of the test pressure until the required test pressure has been reached Then the pi€Ssure shall be reduced to a value equ21t09/1 0 of the test pressure and held for a sufficient time to permit inspection of the vessel. Leakage is not allowed at the time 0; the required visual inspectioil. Test
gaug9 range limil = 1 5X Test Pr. = 4X Test Pr
(MillimUill) ( Maximum)
6. INSPECTION & TESlH~G
From Inspector's Viewpoint, following are the major areas of concern during
manufacture of pr. Vessels.
A. MATERIAL INSPECTION:
> ~ ~
1. Materials for Pressure .parts and Non.pressure .parts ... ( UG-4 a,b ) 2. Scrutiny of Mill-Certificates-compliance
co-relate material with certificate
( UG-93 a)
3. Additional requirements: Impact test results, PWHT etc ..... ( UG-84,85 ) 4. Mill Under-tolerance for plates
( UG-16. c)
5. Tolerances on bought-out heads
• 1. Tracability of plate maripection. ,
: A container qesigned to'withstand internal or external pressure. may be imposed by an external source, by the application of heat
from a direct or indirect source, or by any combination thereof.
to the owner-user
Shall be one or more persons or organizations who are knowledgeable
and experienced mechanical
in the material
which affect the integrity and reliability of pressure vessels.
as a composite
of all entities needed to properly assess the technical
All planned, systematic, and preventative actions required to
equipment, or services will meet specified requirements
that equipment will perform satisfactorily in service.
: The work necessary to restore a vessel to a condition suitable for safe
at the design conditions.
If any repair changes the design temperature or
shall be satisfied.
A repair can be the
of pressure or non-pressure -parts that do not change the
rating of the vessel.
Repair organization a.
of the following
The holder of a valid ASME Certificate of Authorization that authorizes the use of an appropriate ASf\~r::Code symbol stamp.
0n ovmer WI
or user of pressure vessels who repairs his or her own equipment
with this inspection code
A contractor whose qualificatiofl.s are- acceptab!.~ io the prE:::sure-vessel owner or user and who makes repairs in accordance with this inspection \
\ An individual or organization that is authorized by the legal jurisdiction.
: A change in either the temperature ratings or the maximum allowable
working pressure rating of a vessel, or a change in both. The maximum allowable working temperature and pressure of a vessel may be increased or deceased because of a re-rating, and sometimes a re-rating requires a combination of changes. Re-rating below original design conditions is a permissible way to provide for corrosion. (
When a re-rating is conducted in whi~h the maximum allowable
working pressure or temperature is increased or the minimum temperature is decreased so that additional mechanical tests are required, it shall be considered an alteration.
: A person who assists the API authorized pressure vessel inspector by
performing specific NDE on pressure vessels but does not evaluate the results of / those examinations in accordance with API 510.
CHAPTER 4 Owner - User Inspection Organization 4.1
An owner or user of pressure vessels who controls the frequency inspectiol}s
of the pressure vessels or the maintenance of them is responsible
for the functions of an authorized inspection agency.
OWNER - USER ORGANIZATION
An owner - user organization implementing,
is responsible for developing
executing, and assessing pressure vessel inspection systems
and inspection procedures that will meet the requirements of this inspection code.
In a quality
assurance inspection manual and shall include the following.
and reports of structure for inspection personnel.
and maintenance of inspectioll_and quality assurance
Corrective action for inspection and test results.
Intemal audits for compliance with the quality assurance inspection manual.
and reports of inspection and test results.
~eview and approval of drawings, dE7si::~tn :..:.a~·";L:lation$, and sjjecifications repairs, ?lterations
that all jurisdictional
for pressure vessel inspection,
and rerating are continuously
Reports to the authorized pressure vessel inspector any process changes that could affect pressure vessel integrity.
and technical knowledge
so that only qualified
for all repairs and alterations.
so that. only qualified
and procedures are utilized.
so that only materials
to the applicable
section of the ASME Code are utilized for repairs and alternations.
Controls necessary so that all inspection measurement are properly maintained
and test equipment
meet the same inspection
as the owner - user
for the quality