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Air Systems CO2, HPA, Regulators, Remotes, etc.

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Old 03-20-2009, 01:11 PM
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12 Gram C02 psi?

Is there any way to find out the PSI on a 12 gram C02? Im asking cause I have a paintball mine in the works, but I dont know if 3 x12 gram C02 will be to much for the PVC piping.
I looked on the box and on the 12 gram itself, but it says nothing about PSI or anything.

Im a noob to the 12 gram thing, so any help would be awesome!
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Old 03-20-2009, 01:38 PM
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Re: 12 Gram C02 psi?

I believe the pressure which is determined from the amount of Co2 crammed into that specific space can reach levels of 1200 psi when left out in the sun.

So, you kinda need to be prepared based on that...

Home made Nerf Launchers in their most basic design can use 6" of 3/4" Steel Pipe + the 12 gram as plenty or room to lessen the pressure to be both safe and effective.

I know some guys who have made their own mines, let me see if I can find a link or something for you.

Here is a start: http://undergroundmodshop.com/forums...ighlight=Mines
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Old 03-20-2009, 01:44 PM
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Re: 12 Gram C02 psi?

well psi really has to deal with the amount of air per area, so 12 grams in that little cylinder may have 850-1000psi, but once you expose it, the psi will drop, if you're using it for a mine, one should be enough.
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Old 03-20-2009, 01:46 PM
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Re: 12 Gram C02 psi?

Quote:
well psi really has to deal with the amount of air per area, so 12 grams in that little cylinder may have 850-1000psi, but once you expose it, the psi will drop, if you're using it for a mine, one should be enough.
FLASE, not with Co2. A full 20oz can of co2 has the same pressure as a 1/4 filled 20oz tank. Co2 puts out a consistent pressure based on temperature. your tank will drop from 800-1000psi to 100-0psi very quickly when its used up.

Remember Co2 is not filled as a gas, its a liquid. Its characteristics are different then HPA. Boyle's and Charles Laws


a chart showing temps pressures and solid or liquid forms.
http://www.catpumps.com/select/pdfs/...CHART-4-07.pdf

read threw this one, it seemed like some usable info.
DoomLabs - The Science of CO2
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Old 03-20-2009, 02:16 PM
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Re: 12 Gram C02 psi?

^^ the little 12 gram co2, once you break the top, you can't go back, but what he is asking it for a mine, so all the pressure will be let out at once, not in incremental amounts. so the more space or volume the co2 expands to, like the mine, the pressure will drop.
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Old 03-20-2009, 02:27 PM
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Re: 12 Gram C02 psi?

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Originally Posted by waltrulz
^^ the little 12 gram co2, once you break the top, you can't go back, but what he is asking it for a mine, so all the pressure will be let out at once, not in incremental amounts. so the more space or volume the co2 expands to, like the mine, the pressure will drop.

Only once you go past the full expansion for the 12 grams.

1.8g of co2 = 61.02ci of space

a 12g will expand to 406ci untill that volume is reached the pressure will remain consistant. (as long as its still in a sealed container)
As you take pressure away from C02 the remaining liquid boils off to maintain the same psi to keep its self liquid. so it will stay the same psi untill all the liquid c02 is gone.
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Old 03-20-2009, 03:22 PM
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Re: 12 Gram C02 psi?

Liquid CO2 does indeed boil at low temps. However the evaporation cools the liquid as well. As the temp drops, so too does the vapor pressure and thus the pressure of the gas inside the chamber.

However, I don't think 12g cartridges store CO2 in liquid form. I know it's marked as weight instead of volume, but nothing sloshes around when you shake one up.
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Old 03-20-2009, 03:44 PM
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Re: 12 Gram C02 psi?

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Originally Posted by Jaron
Liquid CO2 does indeed boil at low temps. However the evaporation cools the liquid as well. As the temp drops, so too does the vapor pressure and thus the pressure of the gas inside the chamber.

true, but it will warm back up to room temp give'n the time. after that it will be right back to the psi it was before the evaporation happend.
Thats like when you shoot your marker too fast and it stops becasue its frozen. The co2 has cooled enough to turn to ice and when in ice form it puts out 0 psi. But let your marker sit for a minute and it shoots fine again, becuase the co2 as turned back into liquid.

I was just pointing out that C02 doesnt go 1000psi after 10 shots its down to 950psi after 10 more its 900psi and so on so on.
Co2 is more like first shot 1000psi after 100 shots still 1000psi after 500 shots still 1000psi the second that liquid co2 is gone the psi drops nearly to 0 within a few shots.
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Last edited by Chase It : 03-20-2009 at 03:52 PM.
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Old 03-20-2009, 04:01 PM
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Re: 12 Gram C02 psi?

Thanks for all the info guys, I am using 3" pvc fittings, a compression spring, 3/8 threaded rod, some washers,rubber washers, and I am trying to make a cool trip mine, but I am going to try 3 12 grams, in the mine just so all the paint is pushed out,or as much as possible, The only worry is that the 3 12 grams will burst the pvc casing, or be riuned after one use, I am going to try it with 3 12 grams anyways, just to see what kinda blast I get from that.

I will be using water for a test run, I dont know the consistancy of the real mine paint, but the water mine will tell me how good or bad of a blast area I have.

I will have pics(maybe a video) as soon as I am finished, maybe a how to , if it actually works as I am tring to.
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Old 03-20-2009, 04:04 PM
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Re: 12 Gram C02 psi?

I would start with 1 and then try 2 and then goe 3 instead of over doing it the first time and blowing everything up.

If you make it where the c02 comes in below the paintfill then most of it should be expelled with just 1. but i look forward to seeing this.
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