Monday, August 31, 2020

[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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