Whereas Minimum PWHT temperature for B31.3 piping is 704 °C, when we restrict the min tempering temp to (e.g. 730 °C), forging vendors are denying to meet the requirement (e.g. welded valves), quoting IBR regulation 282a.
However there is a note at the end "The tempering temperature may be varied by the Inspecting Authority to suit the steel being tempered".
My question is had anybody approached in the past and able to convince IBR for higher tempering temperatures?
Q: how forging vendors are meeting this requirement when PWHT temperature shouldn't exceed tempering temperature (for e.g. UOP states tempering temp shall be 28 °C higher than PWHT temp)
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