ASME B 31.3 piping
ASME B 31.3 piping
(OP)
hello all,
please help me.I am going to complete one A106 pipe weld of 30 inch dia and 60mm thick.I have one more to complete.Can i make a delayed stress relieve on the first completed weld?the client insisting on doing the pwht as soon as the weld completed.i have only one heat treatment machine at site.what is the difference between stress realieve and pwht?should it be carried out soon after the weld completed?
thanks,
klln
please help me.I am going to complete one A106 pipe weld of 30 inch dia and 60mm thick.I have one more to complete.Can i make a delayed stress relieve on the first completed weld?the client insisting on doing the pwht as soon as the weld completed.i have only one heat treatment machine at site.what is the difference between stress realieve and pwht?should it be carried out soon after the weld completed?
thanks,
klln





RE: ASME B 31.3 piping
Just make sure it gets completed before the pipe is commissioned or as in your case as soon as possible to satisfy the client.
RE: ASME B 31.3 piping
ASME B31.3-2002, table 331.1.1 does not specify any time period for PWHT after welding for P1 material (A106), so PWHT can be carried out any time before pressure test. However the table calls for heatreatment of P62 (Zr alloy material)materials within 14days after welding.
PS: Please ensure that there is no specific requirement in your client specification on PWHT about timing of PWHT.
Muthu
RE: ASME B 31.3 piping