[MW:20017] PWHT requirment for Weldo let as per B31.3

Dear Friends

header line thickness 10" sch140(25.4 mm) we have done PWHT for Groove joints as per B31.3, Weldo let welded (sch 140 ) in same line,  wheather PWHT required as per B31.3 if yes pls explain how it is calculated 

Regards

K.Anandakumar

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