RE: [Man.Distr] stress relieving

From: <Sajit>
Date: Thu Nov 13 2003 - 04:05:00 EST

Pankaj,

Will the HAZ in general going to weaken the parent pipe. If that is so, then all pipe welding would have the same problem. I think it is not so because of the use of the appropriate WPS.

Sajit

-----Original Message-----
From: Mandal Pankaj SPEL-T1 [mailto:Pankaj.Mandal@siemens.com] Sent: Thursday, November 13, 2003 12:26 PM To: 'PipingDesign@yahoogroups.com' Subject: [Man.Distr][PipingDesign] stress relieving

I find this solution being practiced in industry quite often. However, I have a different opinion. If we do a weld build-up, probably we would have a temporary solution. But the heat affected zone around the weld becomes so weak that failure of pipe (in this case thinning of pipe) would occur may be not from the weld itself but a zone very close to it. I have faced similar situation in an earlier project. I suggest, first try to detect the cause of this thinning. Probable reason could be wrong selection of material, unaccounted corrosiveness of process fluid, non-homogeneity of piping material (material defect), poor workmanship and if the reason is any of these, I feel some re-engineering is necessary.
Coming to the requirement of stress relieving. I would say definitely yes. By the way, hope pipe material is not alloy steel!!

Regards,
Pankaj Mandal.

-----Original Message-----
From: <a href="/group/PipingDesign/post?postID=6WF1sC0DJwxLLzuSDmT8TdUbVaGyNPE28kEoLb3fN4wfh3ZZeESkoIhq1VrO9NT9kPYSG0IO3A">LIEZWSC@adma.ae</a> [mailto:<a href="/group/PipingDesign/post?postID=6WF1sC0DJwxLLzuSDmT8TdUbVaGyNPE28kEoLb3fN4wfh3ZZeESkoIhq1VrO9NT9kPYSG0IO3A">LIEZWSC@adma.ae</a>] Sent: 13 November 2003 13:35
To: <a href="/group/PipingDesign/post?postID=e1DW7gbaNrDzXq8erSffAoEaLc4L8QwJGXnpv5nCm9hvWFyXH12Ga13ConT8GHjc2okomTqF1XiSVAupU6eR0Mq8h8DjF4Y">PipingDesign@yahoogroups.com</a> Subject: [PipingDesign] stress relieving

Hi,

We have a reduction of wall thickness for a pipe which originally is 10 mm and now is shows 3 mm, the pressure is 300 psig. The area is 1"X1", the line is stress relieved while installation. Now they will make a weld repair (weld build up). the question does is require stress relieving after this repair ?

Regards,
Ali

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[Non-text portions of this message have been removed] Received on Thu Nov 13 04:05:00 2003