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Posted by Wally on April 28, 2006, 12:36 am
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I"m looking at a job that will replace about 50' of 2" black steel
pipe that handles 125 PSI compressed air. There is 110 power at the
site that would run my little Lincoln SP 100 just fine. I've got .030
flux core wire to run in it, so the penetration should be fair. I'd
like to hear some opinions on whether this will do a satisfactory job.
The only inspections will be visual and it can't leak. Thank you for
your time.
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Posted by Steve B on April 28, 2006, 1:25 am
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> I"m looking at a job that will replace about 50' of 2" black steel
> pipe that handles 125 PSI compressed air. There is 110 power at the
> site that would run my little Lincoln SP 100 just fine. I've got .030
> flux core wire to run in it, so the penetration should be fair. I'd
> like to hear some opinions on whether this will do a satisfactory job.
> The only inspections will be visual and it can't leak. Thank you for
> your time.
You seem not to be sure of this. Actually, you are using FCAW rather than
MIG. Big difference.
Penetration is not an issue. Fusion, and porosity are issues.
What is the pipe? What schedule?
If you don't know MIG from FCAW, don't know the difference between
penetration and porosity, and don't know what schedule pipe you are using,
I'd pass if I were you. You might be opening a big bag of snakes.
Keep us posted.
Steve
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Posted by Wally on April 28, 2006, 11:50 am
Please log in for more thread options On Thu, 27 Apr 2006 22:25:16 -0700, "Steve B"
>
>> I"m looking at a job that will replace about 50' of 2" black steel
>> pipe that handles 125 PSI compressed air. There is 110 power at the
>> site that would run my little Lincoln SP 100 just fine. I've got .030
>> flux core wire to run in it, so the penetration should be fair. I'd
>> like to hear some opinions on whether this will do a satisfactory job.
>> The only inspections will be visual and it can't leak. Thank you for
>> your time.
>
>You seem not to be sure of this. Actually, you are using FCAW rather than
>MIG. Big difference.
>
>Penetration is not an issue. Fusion, and porosity are issues.
>
>What is the pipe? What schedule?
>
>If you don't know MIG from FCAW, don't know the difference between
>penetration and porosity, and don't know what schedule pipe you are using,
>I'd pass if I were you. You might be opening a big bag of snakes.
>
>Keep us posted.
>
>Steve
>
You are right, I do need to look at this more. As much the welding,
but the pipe I will be installing.
The pipe will be schedule 40, A106, black steel. Flanges and
couplings rated at 150 pounds. I may not be familiar with the proper
terminology, but not afraid of the work. The work is outdoors, so I
am looking at the flux core rather than gas shielded.
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Posted by AndrewV on April 28, 2006, 10:40 am
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> I"m looking at a job that will replace about 50' of 2" black steel
> pipe that handles 125 PSI compressed air. There is 110 power at the
> site that would run my little Lincoln SP 100 just fine. I've got .030
> flux core wire to run in it, so the penetration should be fair. I'd
> like to hear some opinions on whether this will do a satisfactory job.
> The only inspections will be visual and it can't leak. Thank you for
> your time.
You are asking for advice on welding what is in effect a pressure vessel. In
this case if you need to ask you should pass on the job. Compressed air
contains an enormous amount of stored energy and should be recognized as a
hazard. The questions you should ask are "if my work fails who/ what gets
hurts?" and "What is my liability". Personally I would see if the pipe can
be replaced with threaded fittings, if not I would pass, or find a pressure
vessel certified welder to bring in. I 've considered jobs that stretch my
abilities or experience, over the years I'm getting better @ saying no
because of the painful memories.
Enjoy
Andrew
--
NewsGuy.Com 30Gb $9.95 Carry Forward and On Demand Bandwidth
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Posted by GreenGas on April 28, 2006, 2:00 pm
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>
>> I"m looking at a job that will replace about 50' of 2" black steel
>> pipe that handles 125 PSI compressed air. There is 110 power at the
>> site that would run my little Lincoln SP 100 just fine. I've got .030
>> flux core wire to run in it, so the penetration should be fair. I'd
>> like to hear some opinions on whether this will do a satisfactory job.
>> The only inspections will be visual and it can't leak. Thank you for
>> your time.
>
> You are asking for advice on welding what is in effect a pressure vessel.
> In this case if you need to ask you should pass on the job. Compressed air
> contains an enormous amount of stored energy and should be recognized as a
> hazard. The questions you should ask are "if my work fails who/ what gets
> hurts?" and "What is my liability". Personally I would see if the pipe
> can be replaced with threaded fittings, if not I would pass, or find a
> pressure vessel certified welder to bring in. I 've considered jobs that
> stretch my abilities or experience, over the years I'm getting better @
> saying no because of the painful memories.
>
> Enjoy
>
> Andrew
>
> --
> NewsGuy.Com 30Gb $9.95 Carry Forward and On Demand Bandwidth
My first question was gonna be, before I saw that Andrew beat me to it, why
not use threaded fittings? They are designed for this purpose, and your
assumption that the piping is only going to see 125 psi is a leap of
faith... I routinely see pressure regulators set at well above the normal
system operating pressure, but well within the ability of the system to
handle it - maybe. You never know. What's the piping for?
r/
Steve
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> pipe that handles 125 PSI compressed air. There is 110 power at the
> site that would run my little Lincoln SP 100 just fine. I've got .030
> flux core wire to run in it, so the penetration should be fair. I'd
> like to hear some opinions on whether this will do a satisfactory job.
> The only inspections will be visual and it can't leak. Thank you for
> your time.