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propane tank, as air reservoir

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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Could a propane tank hold pressure

Yes its fine over 100psi
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I wouldn't trust it with 10psi
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propane tank, as air reservoir

Unread postAuthor: jor2daje » Tue Dec 16, 2008 11:33 pm

Sorry if this has already been discussed, but how would a used propane torch cylinder work as an air tank? I assume that they are under considerable pressure from the propane, maybe if the valve was drilled out it could empty the air reasonably quickly. A shraeder valve epoxied on, might be able to withstand some pressure.
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Unread postAuthor: Lentamentalisk » Wed Dec 17, 2008 12:07 am

They are under anywhere from 20psi-120psi (maybe more?) depending on the temperature, and they should be rated at much higher than that, for safety reasons. Still, the shock compression and decompression isn't good for such a thin walled tank. I wouldn't use it over 100psi, but up to that is fine I would say.
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Unread postAuthor: Gippeto » Wed Dec 17, 2008 12:26 am

The relief valve on the cylinders opens up at 375psi. The tanks are a lot tougher than you would expect.

We put this together as a little beer drinking project at work. It uses a propane cylinder as the chamber.

The valve was removed, the tank filled with water, and then the valve area was drilled and tapped for 1/4"npt.

The "canon" has onboard charging via 12v compressor and a 3cell 1650mah Li-po battery. It is generaly charged to 100psi, and will get about 30 shots per battery charge.

It works like a charm. :)
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Unread postAuthor: Xxplosive42o » Wed Dec 17, 2008 12:49 am

Gippeto wrote:We put this together as a little beer drinking project at work.


You MUST elaborate! Do you have any videos of its operation? If it does what I think it does that would be a perfect addition at my fraternity house.

Cheers! 8)
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Unread postAuthor: Gippeto » Wed Dec 17, 2008 1:10 am

What do you "think it does"? :)

It shoots marshmallows mainly, and occasionally more "damaging" things, such as pieces of hickory.

No videos.
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Unread postAuthor: maggotman » Thu Dec 18, 2008 3:21 am

im using a 4.5kg propane tank as my chamber i have had it up to 250 psi.
im sure as it containes a flamabull gas it would have a good safty factor.
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