The NACE fabrication requirement is about the control on the resulting hardness of the weldment and not specifically that requiring PWHT. A WPS that which can consistently give weld hardness within the limits of 22 HRC, does not require to have the PWHT.
Sajit
"For CS pipe (A 106 Gr. B) in Sour service, PWHT is mandatory. It is a service requirement."
Save a tree...please don't print this e-mail unless you really need to. Received on Tue Feb 26 09:10:00 2008
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