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Need for Post Weld Heat Treatment

Need for Post Weld Heat Treatment

Need for Post Weld Heat Treatment

(OP)
On a 18" flare line we have installed a 16" nozzle using a split Tee.  The WT of the pipe is 3/8", WT of the Tee is 30 mm.  This tee is welded to the run pipe with two circumferential welds.
Acc. to B31.3 a PWHT is necessary.  Is it allowed to machine the Tee and the welds in order to reduce their thickness so a PWHT is no longer necessary?

PS - For a number of reasons a PWHT on this line is not an option.

RE: Need for Post Weld Heat Treatment

Quote:

Acc. to B31.3 a PWHT is necessary.  Is it allowed to machine the Tee and the welds in order to reduce their thickness so a PWHT is no longer necessary?

Too little information to help you. Any wall thickness reduction needs to be re-evaluated by minimum wall thickness calcs in accordance with ASME B31.3.

RE: Need for Post Weld Heat Treatment

Assuming the material is in P-No.1, please review 331.1.3(b)(1). It may apply.

RE: Need for Post Weld Heat Treatment

Please disregard previous comment; it applies to fillet welds

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