What about H2S lines? Low High stringer, hot, fill and cap. What about tig stringers, low ligh hot, fill and cap. Low pressure lines down hand only???? High pressure lines uphill only???? Thats not the industry standard. JT will surely add to this but in my experience most mainline is downhand. Alot of the piping done above ground such as in stations and plants are low high hot, fill and cap with 5p stringer, low high stringer or even tig stringers it really all depends on the situation and the company you are doing the work for. In my opinion, learn how to weld pipe using all processes, uphand, downhand high pressure low pressure whatever, its all pipe.
cmays , I couldn't have put it better . Sometimes its hard for me to express exactly what I mean . The H2S lines I have welded have been TIG - LoHi .
I totally agree with you. It's best to know how to do all of it. Uphill/downhill, tig/stick, and now, wire...UGH. But anyways, the more you know the more versatile you are and the more job opportunities you'll have. I've been on jobs where knowin how to do a different process than what we was using originally kept me on the job for a couple extra weeks. In the end, it's the welders responsibility to know all that they can in this trade. Be it how to fit, weld, rig and be able to read/draw an iso. The working pressure of the pipe has no bearing as long as you can make the weld that's called for on a constant basis.
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