Re: [MW:15314] Repair after PWHT - B 31.1

Required PQR after secopnd time PWHT. Because its affect the mechanical properties.

 

Regards

Pramodh

From: Siva <siva78siva@yahoo.com>
To: materials-welding@googlegroups.com
Sent: Tuesday, September 11, 2012 12:19 PM
Subject: Re: [MW:15269] Repair after PWHT - B 31.1

PWHT shall be done after weld repair. So my understanding is, to find weld repairs, we need to perform NDT before PWHT. I have seen in my experience, normally, NDT will be done prior to and after PWHT also(i.e., twice on that joint).
If NDT done only after PWHT, found any defects, then after weld repair, again should perform PWHT, which might effect mechanical properties.

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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Regards,
G.Sivalingam., BE.,
Quality Control Inspector - Welding,
SAS Project, Abu Dhabi, UAE.

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