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Re: [MW:35935] RT/UT before PWHT for P1 material

By Materials & Welding

Just to share. As per ASME B31.3, PWHT is not mandatory for P! material provided certain conditions are fulfilled and not considered a service requirement. If it is a service requirement it is preferable to perform UT before PWHT & RT after PWHT since repair welds need PWHT if PWHT is a service requirement..

If it is ASME Sec.VIII Div.I, for P1 material as per UCS-56 Repairs are permitted after PWHT. Snap shot below.


Inline image
Inline image


Thanks & Regards

J.Gerald Jayakumar

0091-8838619635



On Monday, 29 December 2025 at 01:09:24 pm IST, 'ranajit chatterjee' via Materials & Welding <materials-welding@googlegroups.com> wrote:


Dear Sirs,

As per ASME B31.3 clause no.341.3.1(a) mentioned P Nos.3,4,5A,5B,5C AND 15 materials examination(RT/UT) shall be performed after completion of heat treatment. But no information for P1 material whether NDT performed before or after PWHT.

Please advise can we perform NDT(RT/UT) before PWHT activity for P1(NACE/H2 service) material or not.


Regards,
Ranajit Chatterjee
9995018265

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