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ndnmechanic
Member

Join Date: Apr 2012
Posts: 9

Welding Gas Pipe

05/15/2012 2:34 PM

Anybody have absolute Gas evacuation techniques for gas pipe prior to welding. I've welded liquid gas before. And I understand nitrogen is used in some cases. Lots to be considered,seams,cracks,gas obsorbtion in pipe pores etc. Please anybody shed some more light..Not welding anything yet,want to hear what you guys have to say..

Thank you all for your time.
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RDGRNR
Guru
Engineering Fields - Instrumentation Engineering - New Member

Join Date: Dec 2009
Location: San Antonio, TX USA
Posts: 844
Good Answers: 29
#1

Re: Welding Gas Pipe

05/15/2012 7:27 PM

One word. INERT! Now, go forth and evacuate. Don't forget to read up on local regs for hydro testing. Here's what Wiki has to say. You can wiki too.

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 "Do not worry about your difficulties in Mathematics. I can assure you mine are still greater". - Albert Einstein
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drbobwoolery
Power-User
Hobbies - CNC - New Member

Join Date: Feb 2010
Location: Vallejo, CA
Posts: 127
Good Answers: 8
#2

Re: Welding Gas Pipe

05/15/2012 10:25 PM

The safest method, in terms of avoiding explosion, is to keep a few ounces of gas pressure on the line, light a fire at the crack, and weld it up. If it is burning, it cannot blow up! If you need experts, call Pipeliner's Local 798 in Tulsa Oklahoma.
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Davesets
Commentator

Join Date: Nov 2010
Posts: 88
Good Answers: 4
#3
In reply to #2

Re: Welding Gas Pipe

05/16/2012 4:56 AM

NOT!
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ndnmechanic
Member

Join Date: Apr 2012
Posts: 9
#5
In reply to #2

Re: Welding Gas Pipe

05/16/2012 2:29 PM

Thank you for the info,I appreciate intelligent words of info from my piers...
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h2om
Commentator

Join Date: Nov 2006
Posts: 59
Good Answers: 2
#4

Re: Welding Gas Pipe

05/16/2012 8:49 AM

I am a zealot that has done this job before. Charge the system with argon using a nylon tube or just plain flooding. However uless there is oxygen in the pipe it cant explode or burn.
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ndnmechanic
Member

Join Date: Apr 2012
Posts: 9
#6
In reply to #4

Re: Welding Gas Pipe

05/16/2012 2:30 PM

Your info is both appreciated and intelligent,thank you...
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Davesets (1); drbobwoolery (1); h2om (1); ndnmechanic (2); RDGRNR (1)

Previous in Forum: Flattening Test of Pipe as Per Addendum 3 of API 5L 44th Edn Spec   Next in Forum: What Statistical Approach for Maximizing Output?

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