Thursday, May 31, 2012

[MW:14426] Tank Clean out door PWHT

Hi, Can any one tell whether I can carry out PWHT of clean out door
welding after erection of first shell course?
We have erected the clean out door section of the shell plate and
completed vertical welding without performing the PWHT. As per API
650, it needs to be completed PWHT regardless of thickness before
assembly(erection).
if that is the case, I have to cut the joint and do the PWHT and
reweld again.Can I do PWHT at site after erection?
If not, any one explain me what is the reason behind it. Why API is
insisting to have PWHT before erection.
Cheers,
Thomas

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