Dear Shankar,
I agreed with Rahman.
The root cause of subject matter- to keep min.dist between two joints -is to avoid HAZ stress effect. In our previous refinery project we were using Bechtel spect as per that if presser parts than six times of pipe thk. or 50 mm whichever is greater. If there is no presser parts like support then we can keep it 2T or 40mm whichever is greater.
Hope that it is clear..
Thanks,With Best Regards,
Ramesh Barot
From: Fitria Rahman <t.chintaqa@gmail.com>
To: materials-welding@googlegroups.com
Sent: Fri, February 18, 2011 5:08:03 PM
Subject: Re: [MW:9927] min. distance between two circumferential welds
Dear Shankar
The ASME B31 Code does not give us the limit. I suggest you to check the engineering document (drawing). What you're looking for might be at there. Some peoples call them as miter.
From several projects where I was there, restriction between the edges of the two circumferential welds is judged by the engineering department. Some of them specify that the distance between the two of circumferential butt welds shall not be less than four times from the pipe thickness or 30 mm, whichever is greater. But other document also specifies 5 times from the pipe thickness.
However, all what you can do is to avoid the HAZ and stress effect. This may be a 1 inch for thin material or more than 4 inches for great wall thickness material.
Fitya a
2011/2/18 T. Mahendran <cbemahendar@yahoo.com>
Hi,
Considering the heat affected zone , It has been fixed as a thumb rule 4times of pipe thickness .
There are no specific code as for as my knowledge.
With regards
T.Mahendran,
Tabouk - KSA,
From: Zakaria ghrab <zakaria.ghrab@gmail.com>
To: materials-welding@googlegroups.com
Sent: Fri, February 18, 2011 1:21:15 PM
Subject: Re: [MW:9924] min. distance between two circumferential welds
Hi,--
i have same problem in last project, power piping process .According B31.1, we don't found information, we get approbation from engineering.
2011/2/18 shankar k <shankark.qc@gmail.com>
--hi,can anybody exlain what is the distance between two circumferential butt joints ? we are welding 5" pipeline joints of A53 Gr.Bshankar
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GHRAB Zakaria
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