Re: [MW:13810] Post Weld heat treatment & No of thermocouples regarding

Dear Sir,

 

The PWHT Temp range is different in ASME B31.3(Table 331.1.1) and ASME Sec VIII Div 1(Table UCS 56), but both are from ASME. The welding and welder qualification are as per ASME Sec IX, for both B31.3 and Sec VIII, Div 1.

 

Why ASME Committee put such a different requirement although both are published from ASME and material grouping is also same, means the metallurgical properties should be same. What should be the criteria of PWHT for PQR run on a Pressure Vessel?

 

Looking forward for a technical clarification.

 

Thanks & Regards

Vino-Doha

 

_________________________________________________________________________________________________________

 

On Sat, Mar 3, 2012 at 8:52 AM, pgoswami <pgoswami@quickclic.net> wrote:

Hi Eswaran,

 

These two are the important among the applicable clauses for local PWHT. As stated here and as required a as a part of the quality documentations a PWHT procedure is required.It should include as a minimum requirement the following:-

1. mode of heating   
2. ramp rates(both heating and cooling)
3. recommended PWHT time and temperature, Item 1,2,3 should be as per the design code
4. no of  thermocouples required, location, width of the heating band etc(one may follow AWS D-10.10) as a default standard.

If the client has a written procedure , one should follow that. In case of  a  technical conflict , AWS D-10.10 may also  be referred.

 

Thanks.

 

Pradip Goswami,P.Eng.IWE

Welding & Metallurgical Specialist & Consultant

Ontario, Canada.

Email-pgoswami@sympatico.ca,

pgoswami@quickclic.net

 

6.3.3.4 Post-weld heat treatment — Local heating

Local post-weld heat treatment shall consist of heating a circumferential band around the weld at a temperature within the range specified in the qualified WPS. The minimum width of the controlled band at each side of the weld on the face of the greatest weld width shall be the thickness of the weld or 50 mm (2 in) from the weld edge, whichever is less. Heating by direct flame impingement on the material shall not be permitted.

6.3.2.6 Post-weld heat treatment

Post-weld heat treatment shall be in accordance with the applicable qualified WPS. Welds may be locally post-weld heat-treated. The manufacturer shall specify procedures for the use of local postweld heat treatment.

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From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of K.Babu
Sent: Friday, March 02, 2012 9:07 AM
To: materials-welding@googlegroups.com
Subject: Re: [MW:13808] Post Weld heat treatment & No of thermocouples regarding

Hi

 

We need to refer client spec for this job.

 

VG, Cameron got their own spec for PWHT.

 

 

On Fri, Mar 2, 2012 at 2:28 PM, Eswaran samikannu <eswaranaws@yahoo.co.in> wrote:

Good day to all,

 

We are one of the authorised repairing & Manufacturer  of OEM Cameron, VG & Shaffer BOP and riser pipes , I want to know thermocouples location / No of thermocouples vs Pipe size according to API 6A /API 16A for localaised stress relief (PWHT), Any one have the standards let me know or inform where i can get the information.

 

Thanks

S.Eswaran 

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Thanks & regards,

K.Babu

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