Hi ,
Which version of B31.3 code you're following , 2018 or older?. You may still avoid PWHT, if the design code is of 2018 edition. See the exemption clauses from B31.3 -2018 as highlighted.
Note: If PWHT is mandated by design or process condition, e.g. sour service or other conditions, PWHT is mandatory irrespective of thickness. The designer has to specify that in the drawing.
All appropriate clauses are highlighted for better understanding. Hope this would help you.
Thanks.
Pradip Goswami, P.Eng, IWE Consultant-Welding-Metallurgical Engineering | |
Cell & Whatsapp-905-9793232. Personal:pgoswami@rogers.com |
From: materials-welding@googlegroups.com <materials-welding@googlegroups.com> On Behalf Of Andrew Ubakwem
Sent: August 31, 2020 10:10 AM
To: materials-welding@googlegroups.com
Subject: [MW:31371] PWHT Thickness Requirements.
Dear all
Pls what is the current thickness requirements for PWHT as per ASME B31.3?
I came across old version of the code, it specifies that PWHT not required for all P1 materials, provided min preheat is maintained at 95deg'C.
We intend welding; 18" sch 80(23.83mm) to ASTM A 106, 24" sch 80(30.8mm), is PWHT required? Cite relevant Code sections Please.
Regards,
Andrew.
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