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Re: [MW:35936] RT/UT before PWHT for P1 material

By Materials & Welding

Just be specific to question.

1. NACE MR0175 do not require mandatory PWHT unless Hardness requirements are met.
2. NACE MR0103 for Refinery sour service & associated NACE SP0472 for environmental cracking do not mandate PWHT for sour service snap shot below.
2. For H2 service PWHT is not a mandatory requirement as material selection are governed by Nelson curves (API 941).

PWHT for P1 material is optional and though if performed for P1 material due to service requirement (as dictated in the specification), UT/RT after PWHT is recommended for mainly Repair occurring after PWHT .

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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