- Use RT film (as wide as possible ) to cover the circumferential welds + at least 1 inch of each intersecting seam weld (for 100% RT welds).
- For spot welds, ensure that a spot RT must be taken at the intersection to cover welds in both the circumferential direction + at least 1 inch of each intersecting seam weld.
UW-9 DESIGN OF WELDED JOINTS:(d) Except when the longitudinal joints are radiographed 4 in. each side of each circumferential welded intersection, vessels made up of two or more courses shall have the centers of the welded longitudinal joints of adjacent courses staggered or separated by a distance of at least five times the thickness of the thicker plate.
Oil Industry Specification:-
Assembly of piping components: For butt welding of all piping components (e.g. pipe ends, fittings and welding neck flanges) a uniform root gap shall be provided as specified in the relevant Welding Procedure Specification. Unless otherwise stated on the isometric drawings, the bolt holes of all flanges shall straddle the centre lines of the pipe ends.
The minimum distance between the edges of two pressure-containing welds shall be 50 mm or twice the thickness of the thicker pressure part, whichever is the greater. This is required also for the distance between non-pressure attachment welds to a pressure containing weld. Longitudinal welds in two adjacent pipes should be 180° apart, but in any case shall be separated by at least 50 mm or twice the wall thickness of the thicker pipe, whichever is the greater.
If the pipe contains a longitudinal weld, this weld shall not be located at the bottom of the pipe after installation; it should be located at least 45° from the bottom of the pipe.
From: Eduardo Calva [mailto:eduardocalva@hotmail.com]
Sent: Thursday, February 03, 2011 8:52 PM
To: pgoswami@quickclic.net
Subject: RE: [MW:9488] Weld seams coinciding
Could you please help me with the below said about the elbow seams coindiding in a gitrh weld?
There is something in some code, or spec about it?, in order to support?, I think by radiographing and make sure that there aren´t defects in that weld crossing.
Thanks a lot
Date: Wed, 26 Jan 2011 11:00:40 +0000
To: materials-welding@googlegroups.com
Subject: Re: [MW:9488] Weld seams coinciding
From: muthu_barathi@rediffmail.com
Hi.
no problem just take Spot RT on + joint to ensure any weld crack or any
defects at intersection and found Ok release the joint. All codes
permits.
On Wed, 26 Jan 2011 10:06:34 +0530 wrote
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Dears, we have a weld joint between elbows in which the seams coincide.
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How can we support this issue?, the restriction is only for pipes or
for elbows as well?
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Thanks for your help.
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Eduardo Calva
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