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Re: [MW:35399] PWHT Holding Time requirement as per B31.3 latest revision

By Materials & Welding

It is a function of Thickness and that is the reason it is titled upto 50mm and above 50mm it will be 2Hours minimum . This thickness Title is common for P1 to P11A, for example P5B even 5 mm requires PWHT for which this 15minutes applicable.

Thanks & Regards

J.Gerald Jayakumar

0091-8838619635



On Saturday 25 January, 2025 at 09:07:24 am IST, 'ranajit chatterjee' via Materials & Welding <materials-welding@googlegroups.com> wrote:


Dear Sirs,

As per B31.3 process piping Table 331.1.1-1 refers minimum holing time for PWHT P1 to P11A group materials 
1hr/25 mm, 15 min minimum. Refer snap shot.
How can we interpret it ? As per 1hr/25 mm or only we can apply 15 min soaking time.

Kindly clarify. 



Regards,

Ranajit Chatterjee

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