Hello everybody, my name is Joe. Im from Tennessee, and work for a natural gas utility. I joined this forum to get tips and techniques from others who weld on gas line, if anybody here does. Every year employees must certify through a company called world testing, in order to weld on gas pipe. My first certification is this October. If anybody here is familiar with what I'm talking about, I would like to chat with you, whether you certify or just weld on natural gas pipeline. Would like to ask about your techniques, and a few other miscellaneous questions. Please PM me or send me a chat request
Thank you,
Joe
- Otto Nobedder
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Weldmonger
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Posts:
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Joined:Thu Jan 06, 2011 11:40 pm
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Location:Near New Orleans
Welcome, Joe,
That's interesting that you have to retest every year. There are some folk here who are familiar with NG, who may comment. By the way, is your work all NG, or do you do LNG?
I'd think the annual retest is a company requirement, as I'm ASME certified to weld on liquid Hydrogen (and other cryogenic) vessels and pipe, and I'm only required to retest if I've not done a code weld in the previous six months. However, when I do code welds, at least 10% is NDE'd, usually X-ray, so I suppose it's like I'm "testing" each time.
Steve S
That's interesting that you have to retest every year. There are some folk here who are familiar with NG, who may comment. By the way, is your work all NG, or do you do LNG?
I'd think the annual retest is a company requirement, as I'm ASME certified to weld on liquid Hydrogen (and other cryogenic) vessels and pipe, and I'm only required to retest if I've not done a code weld in the previous six months. However, when I do code welds, at least 10% is NDE'd, usually X-ray, so I suppose it's like I'm "testing" each time.
Steve S
We are required by the Tennessee Gas Accossiation to be certified every year. Our testing is to be done on four inch IPS pipe, two inch IPS, and what we call a '' no blow, '' on two inch pipe. You and others may know this, but our testing consist of welding the pipe with three passes, then cutting out 2x12 inch strips, send them off to a testing facility and have a machine do a stress test to see if the weld breaks, or the pipe pipe breaks, same with the '' no blow. '' From what my fellow employees tell me is, as long as the first pass is good, meaning welding the inside of the pipe, the stress test will pass. The second and third are just to fill and make look nice. The second pass is the most difficult for me, because I cannot push the first pass back in the pipe, in order to make the third pass look good. I don't know the specifics on our welder, but I will tomorrow and get back to you. We weld with 3/16 rod, don't know the rod type, but I will tomorrow . Maybe the second pass I should turn up the voltage to burn the weld hotter, in order to push the first weld back into the pipe. Anyways, it's late, I'll get some more specs tomorrow. Thanks for your reply.