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  #1  
Old 12-03-2019, 09:18 AM
MrCrankyface MrCrankyface is offline
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Default Welding on an air tank?

I got a hold of a pretty cheap 48 gallon air tank for compressed air.
My problem here is that it's horizontal and I want to stand it up vertically.

Instinctively it feels quite wrong to weld on an air tank but has someone here tried it?

I'm just thinking of welding new feets on at one end to stand it up.
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  #2  
Old 12-03-2019, 09:43 AM
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gimpyrobb gimpyrobb is offline
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I say no problem doing the modification, just make sure you hydro test it once your done. Compressed air is no joke! You could be dealing with a huge bomb if its not tested.
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Old 12-03-2019, 10:17 AM
MrCrankyface MrCrankyface is offline
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Alright, sounds good!
Any tips on how to hydrotest it?

I believe I saw a guy on youtube hook up a high pressure washer and monitored the pressure..
But how high to go? 15 bars if I want 10 bar as max or even higher?
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Old 12-03-2019, 11:11 AM
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Why not just fabricate a bracket with the feet on that and slide the tank into that? you could roll a strap put a bolt in the strap ends to draw it up tight to the tank. and not have to weld on tank at all.

Scott
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Old 12-03-2019, 11:27 AM
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Shade Tree Welder Shade Tree Welder is offline
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Quote:
Originally Posted by Scotts View Post
Why not just fabricate a bracket with the feet on that and slide the tank into that? you could roll a strap put a bolt in the strap ends to draw it up tight to the tank. and not have to weld on tank at all.

Scott
Scotty you beat me to it. Yes, just fabricate a bracket/stand to support
the tank in the position you want and not actually weld on the tank.
Some strips of rubber between the bracket and tank will keep it quiet
as well.
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Old 12-03-2019, 12:12 PM
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Quote:
Originally Posted by MrCrankyface View Post
Alright, sounds good!
Any tips on how to hydrotest it?

I believe I saw a guy on youtube hook up a high pressure washer and monitored the pressure..
But how high to go? 15 bars if I want 10 bar as max or even higher?
Quote:
Originally Posted by MrCrankyface View Post
Alright, sounds good!
Any tips on how to hydrotest it?

I believe I saw a guy on youtube hook up a high pressure washer and monitored the pressure..
But how high to go? 15 bars if I want 10 bar as max or even higher?
I don't know about the youtube guy, but I posted about doing this for my air tank with a pressure washer here on SFT.
You cannot just crank on the pressure. First know the working pressure of your tank, and then test for double the WP.
You will need gauges and a bleed off to prevent over pressuring the tank. And fill it with water completely to eliminate any air at all in the tank before you start..
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  #7  
Old 12-03-2019, 01:21 PM
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You could do like I did on my used ASME certified120 gallon replacement air compressor tank. Mine was in a dedicated building for sound reduction in the shop. I welded mounts for the compressor head and the motor. My test included mounting everything, wiring everything up and then turning on the compressor and leaving it until it shut down at full pressure. I left the area and sat on a bucket about 100 yards away during the test. This was about 10 years ago. Still runs great.

Not saying this is a proper test, just the way I did it.
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Old 12-03-2019, 02:13 PM
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A drain at the new bottom of the tank would be beneficial. Not sure if you have a plug on the current side that could function as such...
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  #9  
Old 12-04-2019, 04:16 AM
MrCrankyface MrCrankyface is offline
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Scotts/Shade Tree Welder: I'm cheap and figured 3 feets would be less material than a cradle thing. but I also have a long history of making things more difficult than they should be soooo ..

Ironman: Thanks for the link! Tons of useful info in your thread!

milomilo: You're clearly much braver than me, even sounds OSHA approved.

mccutter: I'll make sure to have a drain at the bottom so I can easily empty out the crud and water.
I will have a cooling sling between the compressor and tank as well so hopefully not too much gathers in the tank.

Currently waiting for the tank to get delivered then I'll probably make a little project thread in the fabrication subforum.
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