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We welded P91 one year back, but till we did not perform PWHT.

Since one year we did not perform PWHT :(

Dear Colleagues, I am aware all of above techniques. What I am asking, there is some time limit between P91 welding and PWHT, say 3, 7 or Max 29 days, if we do not organise PWHT within 29 days, it will lead us SCC crack. I am wondering to where I can get aforementioned info i.e time between...

Many thanks for your of your comments, as per my study, According to Babcock & Wilcox, the time between completion of welding and PWHT should be limited to 14 days maximum to minimize the risk of SCC: Gold M, Hainsworth J, Tanzosh J M, ‘Service experience with design and manufacturing...

Thanks my friend and it is solved now. Issue was seen on the plate

Hi All, Can any body tell me to where I can find time between welding and PWHT for P91 materials especially for Power Piping. Thanks Regards Muhammad

I just want to some important/critical points on the subject: The whole dispute we had on welding was the root pass for P91 for the first layer itself which should be 8 and above. However code allows after welding 1st layer PMI reading should be 7.2 and above. ASME Section II part A calls...