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Thanks for all the tips. Actually I'm performing the FEA to quantify the stresses from the PWHT procedure. I first place I don't want residual stress near the welding (it's a nozzle's welding). So I'm looking in the ASME code to see if there is something about a allowable stress for the PWHT or...

Thanks for the reply. Yes, I understand that PWHT is for stresses relieve. But no, I don't include any residual stresses from forming/welding in my analysis since I don't know how much is stress is on it. I think the "system" will fail if there are "excessive" stresses above the yielding...

But for the local membrane stress, I use Sy or 1.5*Sy?

Thanks for the answer. I already calculate the thermal stresses (using finite element). I want to verify these stresses against some criteria. Can I use the yield stress as an allowable stress in this situation? I saw you can use 2Sy for secondary membrane + bending. And for local membrane stress?

I'm doing a simulation of a PWHT and I'd like to know if ASME say something about allowable stress for the thermal stresses originating from the PWHT. Thanks, Francisco