Code Requirements on HTASME-SEC-III

8/18/2019 Code Requirements on HTASME-SEC-III

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Code Requirements : Post Weld Heat Treatment

- G S Mahobia

ASME SEC-III : DIV.-1


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ASME Requirements

Applicable Clauses SECT !"- # $%& : Code Requirements

"C-'()*Post Weld Heat Treatment

"C-'()&-Heatin+ and Coolin+ Methods

- An, suitable methods o heatin+ and coolin+.pro/ided therequired heatin+ and coolin+ rates.metal temperatures%metaltemperature uni ormit,.and temperature control aremaintained%

"C-'())PWHT Time and Temp%

Requirements

"C-'())%& 0General Requirements

- All 1elds.includin+ repir 1elds- Time and temperature requirements as per table-"C-'())%&-&- PWHT shall be per ormed in temperature-sur/e,ed and-calibrated urnaces. or PWHT shall be per ormed 1iththermocouples in contact 1ith material or attached to bloc2s incontact 1ith the material%

*Any PWHT time which is anticipated t !e app"ied t the mate#ia" # item a$te# it is c mp"etedsha"" !e speci$ied in the Desi%n Speci$icati n.The ce#ti$icate H "de# sha"" inc"&de this time in the

t ta" time at tempe#ate speci$ied t !e app"ied t the test specimens.


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ASME Requirements


"C-'())%)

Time-temperature Recordin+s

- Records o all PWHT shall be made a/ailable or re/ie1 b, the A %

- denti ication on the records shall be to the 1eld.part. component

- A summar, o the records ma, be pro/ided or permanent records in

accordance 1ith "CA-'&3'%&4

"C-'())%3

#e inition o "ominal Thic2ness

Go/ernin+ PWHT

- Thic2ness o the 1eld.the pressure retainin+ material or structural

attachment 1elds or the thinner o the pressure retainin+ materials bein+

5oined.1hiche/er is least

6does not include ormin+ allo1ances7thinnin+ or mill o/errun 1hen thee8cess material does not e8ceed 3mm%

- 9or illet 1elds throat thic2ness

- 9or repair 1elds and or partial penetration 1elds:the depth o the 1eld

+roo/e pr preparation%


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ApplicableClauses

SECT !"- # $%& : Code Requirements

"C-'())%'

Holdin+ Times at

Temperature

a %- Table-"C-'())%&-& ;based on nominal thic2ness o the 1eld

-- Holdin+ time need not be continuous% t ma, be an accumulation o the times o

multiple post 1eld heat-treat c,cles%

-< Holdin+ time at temp% in e8cess o the min% requirements o table-"C-'())%&-& ma,

be used pro/ided that specimens so heat treated are tested in accordance 1ith "C-))**."C-)'** A"# "C-'3** =%

--c PWHT o certain materials at lo1er temperature or lon+er periods o time in

accordance 1ith Table-"C-'())%' >-&.

--9or P "o%& materials impact test requirements or P?R shall be made usin+ the same

min% temp% @ increased min% holdin+ time.

-- Weldin+ procedures.quali ied as per table-"C-'())%&-& @ "C '())%'>-& are also

quali ied or an, temperature in bet1een%

ASME Requirements

' The PWHT h "din% time sha"" !e at "east () $ the ma+im&m time t !e app"ied t the we"d meta" in p# d&cti napp"icati n.


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ASME Requirements

Applicable Clauses SECT !"- # $%& : Code Requirements"C-'())%'

Holdin+ Times at Temperature

-1hen such in-bet1een temperature is used. the minimum holdin+ time shall

be interpolated rom Table-"C-'())%&-& and Table "C-'())%'>-&

-E8cept or P "o%& materials. 1hen Table "C-'())%'>-& are to be used.the

1eldin+ material certi ication required b, "C-)'** shall be made usin+ the

same min% temp% and increased min% holdin+ time.

"C-'())%B

PWHT Requirements 1hen

di erent P "o% materials are

5oined

-the applicable PWHT shall be that speci ied in Table "C-'())%&-& or the

material requirin+ the hi+her PWHT temperature ran+e%

"C-'())%(

PWHT Requirements or "on

pressure Retainin+ Parts

-1hen "on pressure Retainin+ Parts are 1elded 1ith pressure retainin+

parts.the PWHT ran+e o the pressure retainin+ parts shall control%


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"C-'())%4 E8emptions to mandator,

Requirements

a "on errous materials.

b Welds e8empted in Table "C-'())%4;b -&.

c Welds sub5ected to temperatures abo/e the PWHT temperature

ran+e speci ied in Table "C-'())%&-&.pro/ided the WPS is quali iedin accordance 1ith section and the base material and the

deposited 1eld material ha/e been heat treated at the hi+her

temperatureD

d Welds connectin+ no les to componenets or branch to run pipin+.

pro/ided the requirements in "C-'())%F are metD

e Welds repair to P-"o-3 materials in /essels.pro/ided the

requirements o "C-'())% are met%

ASME Requirements


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ASME Requirements


"C-'())%F

Requirements or

E8emptin+ PWHT o "o le

to Components Welds and


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ASME Requirements

ApplicableClauses


"C-'())%F

Requirements or

E8emptin+ PWHT

o "o le to

Components Welds

and


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ASME Requirements

ApplicableClauses


"C-'())%

Weld Repair to

$essels

-Kimited 1eld repairs to /essels o P-"o%3 materials and A-"o%&.A-"o%)%A-"o%&* or A-"o%&& 1eld iller metal

;SEC !"- .?W-'') ma, be made 1ithout PWHT or a ter the inal PWHT. pro/ided the ollo1in+

requirements are met:

;a E8amination o the area to be repaired : be ore repair area shall be e8amined b, MT or #P in accordance

1ith "C-B&&* and shall meet the "C-B3'* or "C-B3B* standards.

;b Ma8% e8tent o repair : a repair shall not e8ceed (B**mm ) in sur ace area and shall not be +reater in depth

than B*I o the base metal or 1eld thic2ness or &3mm.1hiche/er is less%

;c Repair 1eldin+ procedure:

&% Procedures and 1elders in accordance 1ith Section- 7SMAW @ lo1 h,dro+en co/ered electrodes

)% The lar+est electrode diameter shall be 'mm and bead 1idth shall not e8ceed our times the electrodediameter%

3% Min% t1o la,ers o 1eld metal%The last la,er shall be limited or +round o

'% A preheat and interpass temperature o &B*JC min% shall be used

;d E8amination o repair 1elds : b, MT methods and accepted in accordance 1ith "C-'())% ;a abo/e%


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ASME Requirements

ApplicableClauses


"C-'()3

PWHT Heatin+

and Coolin+ Rate

Requirements

- abo/e ')BJC. the R!H7R!C in an, hourl, inter/al shall not e8ceed ))*JC di/ided b,

the ma8% thic2ness in inches o the material bein+ heattreated. but shall not e8ceed

))*JC and need not be less than B(JC in an, hourl, inter/al%

- #urin+ heatin+ and coolin+ period there shall not be a +reater /ariation in temperature

than &'*JC 1ithin an, '%Bm inter/al o 1eld len+th%9ollo1in+ e8emptions are permitted:

- ;a P-"!%( Materials ma, be cooled in air rom the post1eldheattreatment holdin+

temperature speci ied in Table "C-'())%&-&

- ;b 9or P-"o%4 materials the coolin+ rate at temperature abo/e (B*JC shall not e8ceed

B(JC7Hr.a ter 1hich the rate o coolin+ shall be su icientl, rapid to pre/ent

embrittlement%

"C-'()'

Methods o

PWHT

"C-'()'%&:9urnace Heatin+ L !ne Heat

- the urnace atmosphere shall be controlled so as to a/oid e8cessi/e o8idation. and direct

impin+ement o lame on the component or item is prohibited%


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ApplicableClauses


"C-'()'

Methods o

PWHT

"C-'()'%) 9urnace Heatin+-More than !ne Heat

- o/erlap o the heated sections o the component ot item is at least &%Bm%

- The portion outside the urnace shall be shielded so that the tempertaure +radient is not

harm ul%

"C-'()'%3 Kocal Heatin+- heatin+ a circum erential band around the component or item at temperatures 1ithin

the ran+es speci ied as belo1

- The min% 1idth o the controlled band at each side o the 1eld. on the ace o the +raetest

1eld 1idth. shall be the thic2ness o the 1eld or B*mm. 1hiche/er is less%

- The temperature o the component or item outside the controlled band shall be

+raduall, diminished so as to a/oid harm ul thermal +radients% 6also applicable or

repairs

"C-'()'%' Heatin+ Components nternall,

- Pre/ious to this operation.the component or item shoild be ull, enclosed 1ith insulatin+

material

ASME Requirements


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ASME RequirementsApplicable Clauses SECT !"- # $%& : Code Requirements

"C-'(B*

Heat Treatment a ter


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ASME Requirements


"C-'3&&%)

Capacitor #ischar+e Weldin+

- Ma, be used or 1eldin+ o temporar, attachments and permanent

nonstructural attachment pro/ided:

- Temporar, attachmens are remo/ed in accordance 1ith thepro/isions o "C-''3B ;b

- The ener+, output is limited to &)BW-Sec% @ the min% thic2ness o

the material to 1hich attachments is made is N)%Bmm

- A WPS shall be prepared and shall indicate equipment.combination

o materials to be 5oined and the technique o applicationD

quali ication o 1eldin+ procedure is not required%


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Table "C-'())%&-& Mandator, PWHT


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Table "C-'())%&-& Mandator, PWHT


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Table "C-'())%' ;c -& Alternati/e Holdin+ Temperatures and Times


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Table "C-'())%4 ;b -& E8emptions to Mandator, PWHT


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ASME Requirements

!ther Applicable Clauses SECT !"- # $%& : Code Requirements

"C-)&4* - Heat Treatment to enhance impact properties

"C-)&F* - Procedures or Heat Treatment o Material

"C-))&* - HeatTreatment requirements

"C-))&& - Test Coupon HeatTreatment or erritic material

"C-))&) - Test Coupon HeatTreatment or ?T material

"C-))&)%& - Coolin+ rates

"C-))&)%) - General Procedures

Code Requirements on HTASME-SEC-III

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