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propane question

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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propane question

Unread postAuthor: nibbler125 » Sun Oct 12, 2008 12:23 am

for my next gun I am thinking of using a propane injection system and I was wondering how much psi a small camping propane tank has in it ?
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Unread postAuthor: MrCrowley » Sun Oct 12, 2008 2:58 am

Depends on the pressure. I think at about 65*F it's around 90PSI. If it's hotter, the pressure can easily go into the hundreds.
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Unread postAuthor: starman » Sun Oct 12, 2008 3:41 am

It's best to use a regulator when building your metering system, and use a meter that requires anywhere from 45-70 psi to get the proper load. That way it will still work in colder weather.

One like this works fairly well.
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Unread postAuthor: VH_man » Sun Oct 12, 2008 8:14 am

well, you can go through a long series of calculations to figure out the vapor pressure of propane at whatever temperature you have, or look at a website that does it for you: http://www.s-ohe.com/Propane_cal.html

Basically, the pressure will be around 80-140 PSI, unless you shove the thing into an oven, which is a bad idea anyway.
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