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Old 02-04-2003, 05:28 PM   #1 (permalink)
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Welding a GAS tank???

Well, the tank is empty, but still smells of gas. It was just made, and there are a couple places where it is seeping or sweating out. I have ground down the welds, and want to weld the seams again, but I am afraid the gas will ignight...any ideas?

Is there a chemical I can put in there to Neutralize the gas?

Oh, it is a steel tank.

Thanks.
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Old 02-04-2003, 05:31 PM   #2 (permalink)
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Fill the tank with Water that will displace the fumes then you can weld or (Braze) the seams
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Old 02-04-2003, 05:37 PM   #3 (permalink)
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I have welded my tank I washed it of a few time with TSP and very hot water, rinced it out a few time, let it air dry for a few days then welded it, no problems. Whay you can do is pip your car exhaust into it so ther is no air for ingnition
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Old 02-04-2003, 05:38 PM   #4 (permalink)
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Be careful you don't have any air pockets. I had one 'pop' a little when the small air pocket was ignited. Mainly cause I had the part to weld at the top and that is where the air pocket was. Have also heard to purge it with carbonmonoxide (exhaust gas) but have never tried that. Just don't use hot exhaust gases if you try it.
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Old 02-04-2003, 05:41 PM   #5 (permalink)
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Re: Welding a GAS tank???

Quote:
Originally posted by rfrey
Well, the tank is empty, but still smells of gas. It was just made, and there are a couple places where it is seeping or sweating out. I have ground down the welds, and want to weld the seams again, but I am afraid the gas will ignight...any ideas?

Is there a chemical I can put in there to Neutralize the gas?

Oh, it is a steel tank.

Thanks.
Hi there, it's me again. Yes, you can take the hose off of the Argon/Co2 mix bottle, crank the regulator open and purge the tank with it. Keep it flowing while you weld it up. No oxygen, no combustion.

We have also plumbed the exhaust from a Honda into a gas tank before to weld it up. Heat from the exhaust gets more of the fumes out and the Hondas burn clean enough that they don't add any more. Also a non-oxygen atmosphere.
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Old 02-04-2003, 05:41 PM   #6 (permalink)
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if you have a tig set up shoot it with a argon purge, doesn't stink and works great
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Old 02-04-2003, 05:41 PM   #7 (permalink)
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Fill it 1/2 full of water and then drop in a chunk of dry ice. I just epoxied up my holes.
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Old 02-04-2003, 05:48 PM   #8 (permalink)
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Fill it 1/2 full of water and then drop in a chunk of dry ice. I just epoxied up my holes.


wooOOOOoo a cool bubbly smokey co2 purge!
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Old 02-04-2003, 06:31 PM   #9 (permalink)
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I remember something we learned in Aviation maintenance school about purging with steam. Don't ask me how you will get the steam there, but I remember hearing something about it.
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Old 02-04-2003, 06:37 PM   #10 (permalink)
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You can shoot a CO2 fire extinguisher in there if you can pirate one from work. Just make sure it is a co2 style, not a water or dry chem one. Works fine.

-Brett
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Old 02-04-2003, 06:44 PM   #11 (permalink)
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I have a friend with a CO2 bottle I was thinking about borrowing. How does that sound?


What is TSP? And were can I get it?
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Old 02-04-2003, 06:48 PM   #12 (permalink)
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Originally posted by rfrey
I have a friend with a CO2 bottle I was thinking about borrowing. How does that sound?


What is TSP? And were can I get it?
tsp.....its a cleaner,home depot. paint section. and filling it with water does NOT work .
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Old 02-04-2003, 06:48 PM   #13 (permalink)
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Quote:
Originally posted by rfrey
I have a friend with a CO2 bottle I was thinking about borrowing. How does that sound?


What is TSP? And were can I get it?
TSP=Tri sodium phosphate. Don't worry about it you don't need it.
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Old 02-04-2003, 07:02 PM   #14 (permalink)
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OK, so if I get the CO2 bottle, how do I use it??? This is what I am guessing...please let me know if I am right.

plug all the openings in the tank, excluding one. Place a hose, which will supply the CO2 into the tank into the open hole. Plug this hole with a rag, not quite tight enough so the CO2 can circulate out, but no O2 can get in. Start welding. Now I have to go all the way around the tank...probibly 60"...do you think I will have a problem?

Thanks,
Ryan

PS. All the gas is out of the tank. The rest of it dried up today in the sun.
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Old 02-04-2003, 07:30 PM   #15 (permalink)
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Quote:
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Fill it 1/2 full of water and then drop in a chunk of dry ice. I just epoxied up my holes.
This is the best solution I've ever seen.Trying to wash them out never works.Hell,it's cheap and looks cool.
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Old 02-04-2003, 07:45 PM   #16 (permalink)
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I just washed mine out with the varsol bath, its filled with non flammable solvent. the wash the solvent remains out with gas later.
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Old 02-04-2003, 09:27 PM   #17 (permalink)
 
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Originally posted by Just-fabricate-it
Be careful you don't have any air pockets. I had one 'pop' a little when the small air pocket was ignited. Mainly cause I had the part to weld at the top and that is where the air pocket was. Have also heard to purge it with carbonmonoxide (exhaust gas) but have never tried that. Just don't use hot exhaust gases if you try it.
I have done this quite a few times repairig aircraft fuel tanks when I am in a hurry or when they run auto gas works good as I'm still around and It's cheaper then purging with argon .

rich
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Old 02-05-2003, 09:29 AM   #18 (permalink)
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So, since there is not an actual drip, it only seems to sweat...should I use epoxie or something similar? I saw something like this at Pep Boys....would this be a long term fix...sure it is safer, and that is what I am going for...

What do you guys think???
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Old 02-05-2003, 09:34 AM   #19 (permalink)
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rfrey ... as much as I like your avatar dude, that thing is gonna get me fired if someone walks up behind me ...

- jack
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Old 02-05-2003, 09:39 AM   #20 (permalink)
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Unhappy

So what are you trying to say??? It's hard for me to read between the lines! Soon as I get my rig done, I may change it to that...it won't be as sexy, matter of fact, nobody will notice my aviater anymore
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Old 02-05-2003, 09:44 AM   #21 (permalink)
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Quote:
Originally posted by morpheus
rfrey ... as much as I like your avatar dude, that thing is gonna get me fired if someone walks up behind me ...

- jack
You need to turn off the avatars in your profile.
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Old 02-05-2003, 09:56 AM   #22 (permalink)
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You need to turn off the avatars in your profile.
yes, I know I could do that. But why should I have to do that when he could just change his avatar. I wouldn't imagine I'm the only one with the same concern. I do believe this topic and what was an approriate avatar has been addressed before.

- jack
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Old 02-05-2003, 09:59 AM   #23 (permalink)
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Quote:
Originally posted by morpheus


yes, I know I could do that. But why should I have to do that when he could just change his avatar. I wouldn't imagine I'm the only one with the same concern. I do believe this topic and what was an approriate avatar has been addressed before.

- jack
My concern is that avatars like that will go away and P4x4 will be come a dull and boring place.

Second solution, don't surf from work or stick to JU!
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Old 02-05-2003, 10:18 AM   #24 (permalink)
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I like that avatar! don't take it away!

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Old 02-05-2003, 10:22 AM   #25 (permalink)
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I didn't say I didn't like it

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