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.
--
-- 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
--
To post to this group, send email to materials-welding@googlegroups.com
To unsubscribe from this group, send email to materials-welding+unsubscribe@googlegroups.com
For more options, visit this group's bolg at http://materials-welding.blogspot.com/
http://www.linkedin.com/groups/MaterialsWelding-122787?home=&gid=122787&trk=anet_ug_hm
The views expressed/exchnaged in this group are members personel views and meant for educational purposes only, Users must take their own decisions w.r.t. applicable code/standard/contract documents.
--
Regards,
G.Sivalingam., BE.,
Quality Control Inspector - Welding,
SAS Project, Abu Dhabi, UAE.
G.Sivalingam., BE.,
Quality Control Inspector - Welding,
SAS Project, Abu Dhabi, UAE.
To post to this group, send email to materials-welding@googlegroups.com
To unsubscribe from this group, send email to materials-welding+unsubscribe@googlegroups.com
For more options, visit this group's bolg at http://materials-welding.blogspot.com/
http://www.linkedin.com/groups/MaterialsWelding-122787?home=&gid=122787&trk=anet_ug_hm
The views expressed/exchnaged in this group are members personel views and meant for educational purposes only, Users must take their own decisions w.r.t. applicable code/standard/contract documents.
No comments:
Post a Comment