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Expansion Tanks as a Pressure Vessel?

Post questions and info about pneumatic (compressed gas) powered cannons here. This includes discussion about valves, pipe types, compressors, alternate gas setups, and anything else relevant.
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Expansion Tanks as a Pressure Vessel?

Unread postAuthor: jsefcik » Fri Oct 26, 2012 8:40 pm

at work everytime i go into the maintainence closet i keep looking at these water expansion tanks and say to myself that would make one hell of an air tank, it already has a schrader valve built in and other said has 3/4 pipe threads i dont see why it wouldnt work


ideas??? thoughts???
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Unread postAuthor: jrrdw » Sat Oct 27, 2012 5:54 am

Look for pressure ratings and safe operating temperature ranges.
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Unread postAuthor: jsefcik » Sat Oct 27, 2012 9:02 am

i just looked at the safe temps and said they are perfectly fine up to boiling water temps around 110-210 and pressures up to 120 psi,

personaly i dont see why you couldnt go higher, its pretty much a propane tank, so you should be able to pump alot of air in there
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Unread postAuthor: jrrdw » Sat Oct 27, 2012 10:24 am

As always, safety is upon the user.
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Unread postAuthor: Gippeto » Sat Oct 27, 2012 10:57 am

1) Expansion tanks have a bladder in them.

2) Cost...$60-90 around here, while propane tanks can be bought new for $35...or had for free once expired.

3) If someone throws out an expansion tank...it likely has a hole in it from corrosion...do you REALLY want a pressure vessel that's corroded thin?

4) That "free" expansion tank will still have a bladder in it.
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Unread postAuthor: jsefcik » Sun Oct 28, 2012 10:12 am

Gippeto wrote:1) Expansion tanks have a bladder in them.

2) Cost...$60-90 around here, while propane tanks can be bought new for $35...or had for free once expired.

3) If someone throws out an expansion tank...it likely has a hole in it from corrosion...do you REALLY want a pressure vessel that's corroded thin?

4) That "free" expansion tank will still have a bladder in it.


i wasnt aware of a bladder, but thanks,
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Unread postAuthor: ramses » Sun Oct 28, 2012 12:28 pm

Gippeto wrote:3) If someone throws out an expansion tank...it likely has a hole in it from corrosion...do you REALLY want a pressure vessel that's corroded thin? .


or a tear in the bladder
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