[MW:29799] PWHT exemption for Pipe supports for amine service

Dear Experts,

The Primary supports are welded to pipe ( Carbon steel) and PWHT was not done for amine service.  All the butt welds have undergone PWHT.  PWHT issue was noticed after completion of commissioning.  As per API  945, residual stresses are one of the reason for amine cracking.  Please advise how we can convince client  that residual stresses due to pipe supports welding have no effect on amine cracking.

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