Bert,
qcrobert gave you that very same info TWO days ago ...
Now, had you typed, “PWHT per B31.3” into the “search box”, you would have found that your question was answered in 2005.
Topic PWHT By - Date 06-01-2005 04:12
You are correct Charles. I am assuming Mohammed is working to ASME B31.3, where it states in paragraph 331.2 Where warranted by experience or knowledge of service conditions, alternative methods of heat treatment or exceptions may be adopted as provided in para. 331.2.1 and 331.2.2.
However, para 331.2.2 (a) states where provisions less stringent than those in para. 331 are specified, the designer must demonstrate to the
owner's satisfaction the adequacy of those provisions by comparable service experience, considering service temperature and its effects, frequency and intensity of thermal cycling, etc.
In addition, appropriate tests shall be conducted, including WPS qualification tests.
So if you intend to delete the PWHT requirements, you must have the appropriate WPS and a PQR to support it.
It would be easier, faster and probably cheaper to perform localized PWHT.
Then, you might have asked if anything has changed since then …
(I’m STILL learning to navigate this forum … And not getting too butt-hurt with some 'apparently' sharp replys ... I appreciate ALL the help I get!)
Cheers,
jb