Need for Post Weld Heat Treatment

[stressone]

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.

 

[metengr]

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.

 

[stanweld]

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

 

[stanweld]

Please disregard previous comment; it applies to fillet welds