ASME B31.3-341.3.1(a)-RT before PWHT for P1/P2 Group Piping

Date 01-19-2012 12:40

Dear Experts
Pls advise if my understanding is correct
Const Code- ASME B31.3 Edition 2010
Client Spec. require compliance with ASME B31.3

341.3.1(a)- about P3,P4,P5 Group Piping- require RT after PWHT.

For P1 & P2 Group Piping- RT before PWHT is enough. Not necessary for RT after PWHT

Appreciate you share your experience.

By ozniek

Date 01-19-2012 13:05

Hi Nalla

I would agree with your interpretation. The P3; P4; P5 materials are susceptible to temper embrittlement, thus the requirement. Having said this, mostly client specifications will ask for surface NDT following PWHT, or a delay before performing the final NDT.

Regards
Niekie

By Nalla

Date 01-19-2012 13:30 Edited 02-12-2012 21:53

Hi Ozniek
Thanks and pls refer attached

Btw, Does the same apply for P6 ~ P10H group materials?
Thanks

Attachment: ASMB31.3-341.3.1-a.pdf (131k)