As per API 6A, it was clearly specified PWHT shall be as per WPS only,
PWHT shall be carried as per the written procedure(which shall specify the tolerance in the temperature also) by the manufacturer and complying to the WPS.
Further WPS shall be in accordance with ASME Sec IX.
So as per my view we can refer for ASME Sec VIII Div -1 UW 40,( For requirements) and UCS 56, UNF 56, UHT 56, UHA 56, (for the temperature range, thickness limits, soaking time, etc)
I hope we can follow ASME Sec VIII.
Good day to all,
We are one of the authorised repairing & Manufacturer of OEM Cameron, VG & Shaffer BOP and riser pipes , I want to know thermocouples location / No of thermocouples vs Pipe size according to API 6A /API 16A for localaised stress relief (PWHT), Any one have the standards let me know or inform where i can get the information.
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