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Tank Pressure

Post questions and info about combustion (flammable vapor) powered cannons here. This includes discussion about fuels, ratios, ignition systems, safety, and anything else relevant.
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Tank Pressure

Unread postAuthor: bravootome » Thu Nov 28, 2013 12:45 pm

http://www.spudfiles.com/combustion-cannons/topic25541.html

do you happen to know what pressures does that gas tank hangs on ? i used one of this as an air chamber for an airgun, and i am not so sure it is as good as i was thinking.
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Last edited by jrrdw on Thu Nov 28, 2013 8:09 pm, edited 1 time in total.
Reason: Question given it's own thread, added link.
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Re: Tank Pressure

Unread postAuthor: Ragnarok » Thu Nov 28, 2013 10:07 pm

I wouldn't generally consider LPG (or similar) tanks particularly great pressure vessels. An LPG tank isn't designed to withstand particularly high pressures, and the disposable ones are supposed to be cheap, not durable.

In light of the link Jack posted regarding the Bernzomatic tanks being prone to fracture at the neck, I'd say there's good reason for being very wary when using the tanks (at least of that design) as pressure vessels.
A deeper reading of that site shows that this is not inherent to every cylinder (only some have the poor weld at the neck) and only affects those containing MAPP (which seems to be more corrosive than Propane). So a lot of cylinders may well be relatively safe.

Still, relatively safe isn't something I'm a big fan of - and even if a failure is likely going to be considerably less hazardous than several hundred grammes of flammable gas being released in the vicinity of an open flame, there's still potential for harm.

My recommendation would be to not use it - but this is not necessarily the same thing as saying it's dangerous.
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Does that thing kinda look like a big cat to you?
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Re: Tank Pressure

Unread postAuthor: Biopyro » Fri Nov 29, 2013 3:33 am

The typical working pressure is about 8 bar. In the event that the tank gets hot it could reach 20 bar (50*C) so I presume they are rated to 20 bar.

A friend who works with butane aerosol cans says they are rated to 15 bar in the UK so the logic follows.
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Re: Tank Pressure

Unread postAuthor: jackssmirkingrevenge » Fri Nov 29, 2013 8:48 am

Biopyro wrote:A friend who works with butane aerosol cans says they are rated to 15 bar in the UK so the logic follows.


Rated to, or is that their fail pressure?
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Re: Tank Pressure

Unread postAuthor: Biopyro » Sat Nov 30, 2013 1:44 pm

Rated to 15, apparently burst around 18.
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