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post #1 of (permalink) Old 09-22-2006, 07:15 PM Thread Starter
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bumper as an air tank

im not really sure how this would work but i was thinking about trying to see if my bumper will hold air.
if it does is there a formula to figure out how much air it can/should hold?
its steel, how much of a problem would condensation build up on the inside be?
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post #2 of (permalink) Old 09-22-2006, 07:19 PM Thread Starter
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Re: bumper as an air tank

or would this considered to be "dangerous"
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post #3 of (permalink) Old 09-22-2006, 08:00 PM
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Re: bumper as an air tank

Not dangerous at typical compressor output - 175 PSI won't hurt anything.

Calculate the volume in inches and divide by 268.8 to get gallons.

Yes, condensate can be a problem in any reservoir in a compressed air system. You need to provide a drain at the bottom. A valve is nice, but if it's going to get dragged off put a pipe plug in the bung. You can remove the plug periodically, or just leve it a little loose so that it continuously leaks a little.
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post #4 of (permalink) Old 09-22-2006, 11:34 PM
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Re: bumper as an air tank

Buddy put one in. he used a pipe adn recessed one end to give the quick disconect some protection. He can only fill one 33" tire frome flat to 30psi. If you have an onboard compresor it would be good as a storage tank. I went with an old 5# fire extinguser. Its small and will fill tires from 5psi to 30psi most of the summer and a refill of CO2 is only $5.00. Remember CO2 has a 800 to 1 expansion rate. meaning 1cubic ft of CO2 will expand to 800 cubic ft.
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post #5 of (permalink) Old 09-23-2006, 06:49 AM
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Re: bumper as an air tank

[ QUOTE ]
put a pipe plug in the bung.

[/ QUOTE ]
Sounds like Jim has his weekend planned already? [img]/ubbthreads/images/graemlins/blush.gif[/img]
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post #6 of (permalink) Old 09-23-2006, 07:14 AM
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Re: bumper as an air tank

not dangerous unless it fails....thats why vessels are pressure tested with water instead of air, a failure under air pressure can and will produce shrapnel, water will be much less "explosive"

175 psi is plenty of pressure to cause damage/injury

we had a guy at work release the door pins on an autoclave at 3psi and he went off the wall 40 feet away with a broken arm--lucky guy, door is 8 ft diameter...

if bumper was made for this application---no problem!

if not...you may want to have it tested
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post #7 of (permalink) Old 09-23-2006, 11:58 AM
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Re: bumper as an air tank

I use my rear bumper for an air tank. I don't onboard aire yet though!!! That was my first step I guess. I took it and had a welding supply place tank it for me. Tested at 250psi for 4 hours. I plan on running it at 150psi.
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post #8 of (permalink) Old 09-23-2006, 12:55 PM
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Re: bumper as an air tank

I've built several of them - but I always suggest not carrying them with pressure in them. In an accident they could rupture and become a bomb with shrapnel.

But - when you stop to air up, fill the bumper/tank from the on-board air while you are getting the hose out. A bumper isn't enough to air up 4 tires, but during that "dead" time, and the "dead" time moving between tires makes it go a little quicker - or seems to.

But - usually an on-board air supply alone isn't quite enough volume to run a good impact - the bumper tank helps considerably.

Just bleed it off when you are finished.

In fact, I'm probably building a few more soon.

You can't beat the unlimited supply of air from an on-board air system. Once you have it you'll understand.

You can spend lots of $$$ on an on board air system, or build one for cheap. I've found the Sanden air conditioning compressors do great - that's the round one used on later model Jeeps and lots of other cars. You can get them for about $20 at most junk yards (they seem to think the Yorks are made of gold!)
They are small enough to usually fit, the hardest part is setting up a belt to drive it. Sure, the York is faster, but only by a few seconds. Usually 8 CFM vs. 10 on a York.

I saw an even smaller compressor on a small foreign car that I was intrigued with, but didn't get one. It may work out even better where space is limited.

Compressor $25?, switch $1, check valve $10, gauge $5, and a quick coupler $2 is all you need. Everything else is luxury.
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post #9 of (permalink) Old 09-23-2006, 01:39 PM
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Re: bumper as an air tank

Rich...
I have a Sanden compressor on my 4.3 Chevy. How are you oiling it? I can't seem to get any good advice setting this up for air.

Sorry for OT ?

Hank
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post #10 of (permalink) Old 09-23-2006, 02:58 PM
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Re: bumper as an air tank

[ QUOTE ]
Sounds like Jim has his weekend planned already?

[/ QUOTE ]

Yeah, and don't you wish you were here? [img]/ubbthreads/images/graemlins/wink.gif[/img]
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