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Air volume from tank to chamber

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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Air volume from tank to chamber

Unread postAuthor: Vaeevictiss » Sat Nov 08, 2014 7:06 pm

I hate math lol, so Im looking for a simple calculator or something similar to figure out, basically, how many shots i could get out of an tank of one size and pressure to a chamber of another.

Specifically for this project, how many fills can i get from a 68ci 4500 tank into a ~450ci chamber at 100-125psi.


thanks for any help or direction.
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Re: Air volume from tank to chamber

Unread postAuthor: mobile chernobyl » Sat Nov 08, 2014 8:39 pm

P1V1 = P2V2 will get you the [basic] answers you need!
Set up a simple excel (or google spreadsheets, i.e. free) calculation for one instance, then click and drag it down to figure out when you're at the point of no return (i.e. your tank pressure = chamber pressure).

Math and Ballistics pretty much go hand in hand - it's a good idea to get friendly with math if you're in this hobby!
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Re: Air volume from tank to chamber

Unread postAuthor: Vaeevictiss » Sat Nov 08, 2014 10:08 pm

ill look into this lol. i know enough math to use a mill and a lathe and after that im so lost lol.
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Re: Air volume from tank to chamber

Unread postAuthor: Vaeevictiss » Sun Nov 09, 2014 1:18 am

If I did this right, im getting only 6.8 times at 100psi....kinda pointless lol. how the hell are people here running big guns off little tanks?

just to make sure i did this right, does this look correct?

P1 - 4500psi
V1 - 68ci
P2 - 100psi
V2 - 450ci

4500*68 = 306000

306000/100 = 3060

3060/450 = 6.8 times it can be filled.
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Re: Air volume from tank to chamber

Unread postAuthor: mobile chernobyl » Sun Nov 09, 2014 6:20 pm

That is a safe approximation - and makes a lot of sense if you think about the vast inequalities in volumes!

That .8 after 6 won't yeild a 100psi shot either - so in reality you're only getting 6 full power shots out of that tank.

Not many people use paintball HPA tanks and expect any type of rapid firing or high shot count with such a large chamber volume. With such a large chamber (450cuin) you may also run into flow issues with the paintball tank in the time it takes to fill it - if you do plan on having it as a rapid fire gun.
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