Re: [MW:21253] Post weld heat treatment for blind flange of manhole when lethal service.

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In principle yes, PWHT is mandatory in case of Lethat Service.
If your  material is Pno 1, then you should check the exceptions of UCS-51-1 note (b)(3).
Exceptions exist also for the other Pnos of carbon and low alloy steel. Just check the notes in the tables of PWHT in UCS

best regards

Dr. Georgios Dilintas

Authorized Nuclear Inspector
Authorized Inspector Supervisor


I&F REGIONAL TECHNICAL MANAGER
BUREAU VERITAS HELLAS

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