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Minimum Range thickness fow PQR with PWHT

Thread starter xuanthien
Start date Jul 6, 2015

Status: Not open for further replies.

Jul 6, 2015

xuanthien

Mechanical

Dear Gents,

Refer QW-253 when CVN require, We "change" Holding Time of PWHT is Essential Variable. Refer QW 407.2 i know that maximum holding time of PWHT of WPS = 1.25xPQR.

So How about Minimum Holding time? We afollow record in PQR or follow ASME B31.3, 1 hours/in.