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We have been discussing this for quite some time in the shop and thought it was time to get a actual answer. We would like to know what the minimum weld seam separation for pipe is under API 1104, ASME IV and AWS D1.1. I began to look through our code books, which are all out of date, and found the Girth Weld Alignment 5.22.3.1 in AWS D1.1 but have yet to find anything mentioning weld seams and where they should be placed. To give you a idea of what we are doing, we have a machine we are testing called a Pipeline Inserter which pushes pipe into tunnels or open trench pipelines and it is set up for 30" pipe currently. The pipe is 30" x0.50 X70M with the Dura-Bond DSAW coating. We are welding this pipe to put inside the machine for testing purposes and not to a code weld (although our AWS D.1. certs cover this weld) and was wondering what the actual code(s) says. Any help would be appreciated and if I stumble upon my own answer I will post it up. -JonathanFollow me on Twitter @_JonathanLewis and Instagram @superiorwelding
Reply:Originally Posted by Superior WeldingWe have been discussing this for quite some time in the shop and thought it was time to get a actual answer. We would like to know what the minimum weld seam separation for pipe is under API 1104, ASME IV and AWS D1.1. I began to look through our code books, which are all out of date, and found the Girth Weld Alignment 5.22.3.1 in AWS D1.1 but have yet to find anything mentioning weld seams and where they should be placed. To give you a idea of what we are doing, we have a machine we are testing called a Pipeline Inserter which pushes pipe into tunnels or open trench pipelines and it is set up for 30" pipe currently. The pipe is 30" x0.50 X70M with the Dura-Bond DSAW coating. We are welding this pipe to put inside the machine for testing purposes and not to a code weld (although our AWS D.1. certs cover this weld) and was wondering what the actual code(s) says. Any help would be appreciated and if I stumble upon my own answer I will post it up. -Jonathan
Reply:I think I might have confused everyone here and other forums with this one. I am referring to the longitudinal weld on the pipe itself, in this case double submerged arc weld, and not the girth weld. The girth weld specs makes sense if for no other reason that what you just mentioned. Basically, I have heard pipeliners saying they keep the weld seam at 10 and 2. Reasons being so the welds are not across from each other and if a seam weld ruptured it would not blow the pipe out of the ground/erode down into the earth undetected. -JonathanFollow me on Twitter @_JonathanLewis and Instagram @superiorwelding
Reply:I think in general about 1/3 of the circumference apart is common, sometimes 180 deg's apart.
Reply:Thanks guys! We are on the right track. I also made a mistake in my first post. We are looking at ASME IX and not ASME IV, sorry about that.-JonathanFollow me on Twitter @_JonathanLewis and Instagram @superiorwelding
Reply:We allways run line pipe with long seams opposite quarters. Top only. That is our company procedure. And girth welds have to be 1 And 1/2 times the diameter apart. except for fabrication on meter stations or plants that is a 6 inch minimum. All is welded under api1104. Sent from my iPhone using Tapatalk
Reply:Originally Posted by Superior WeldingI think I might have confused everyone here and other forums with this one. I am referring to the longitudinal weld on the pipe itself, in this case double submerged arc weld, and not the girth weld. The girth weld specs makes sense if for no other reason that what you just mentioned. Basically, I have heard pipeliners saying they keep the weld seam at 10 and 2. Reasons being so the welds are not across from each other and if a seam weld ruptured it would not blow the pipe out of the ground/erode down into the earth undetected. -Jonathan
Reply:Found it!! In AWS D1.1 Structural Welding Code- Steel, 5.22.3.1 Girth Weld Alignment (Tubular), near the end it states "Longitudinal weld seams of adjoining sections shall be staggered a minimum of 90*, unless closer spacing is agreed upon by the owner and fabricator." It was right in front of my face the whole time, oops. I appreciate everyone's help and explanations with this one. Hope this question helps others in the future!-JonathanFollow me on Twitter @_JonathanLewis and Instagram @superiorwelding |
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发表于 2021-8-31 22:06:09