Dear Hiren Sevak,
I have a very simple opinion.
Your WPS specifies about PWHT, if yes it is essential variable for Production Welding.
It is required by code/std./spec. that we sould perform RT after completion of welding. If PWHT is not done, i think the weld is not complete according to WPS. So you can not perform RT before completion of welding of any joint.
On Mon, Sep 10, 2012 at 9:10 AM, sevak hiren <hirensevak80@gmail.com> wrote:
Dear Experts,
Piping Code : ASME B 31.1, Power Plant Piping, (P No.5A,11,12,15, 91 etc pipes) & ASME Sectin I
Contractor is doing piping fabrication stages in following manner,
Preheating & Welding of Piping joints then Post heating, then PWHT & then finally RT.
Contractor is arguing, RT is taken after PWHT to reveal the defects causing due to delayed cracking.
My question
If RT repair is done for particular joint after PWHT then is it compulsory to perform PWHT again for particular joint ? if yes then please mention the clause of code.
Thanks & Regards
Hiren Sevak
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Thanks & Regards
Biplab Pal
Mechanical Inspector (PMT)
YASREF Project
E-mail: biplab.mech@gmail.com
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