This is not a Code requirement.
If I remember correctly, this originated from EPRI recommendations for 91 fabrication. It typically appears in customer specifications/requirements. If low hydrogen procedures&practices are followed and proper storage is maintained, the requirement is, in my opinion and experience, totally unnecessary. If the forgoing are not properly attended to, 2 weeks maybe far too long a time period.
Others may disagree. However my 20 years of fabrication experience have shown my statement to be correct.
Enjoy - John
From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of pradip kumar Sil
Sent: Monday, May 18, 2015 6:52 AM
To: materials-welding
Subject: [MW:23297] Welding & pwht time difference in P-91 Material
Dear All,
Can anybody inform code reference in B-31.1 welding & pwht time diference. Client is asking for 14 days.
Is it mandatory in code
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