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CO2??

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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Unread postAuthor: D_Hall » Wed Feb 03, 2010 1:38 pm

Gippeto wrote:More than you ever wanted to know about co2;

http://encyclopedia.airliquide.com/ency ... the+values

Check out the vapour pressure graph to get a better idea of pressure in a vessel containing liquid co2 at a given temperature.


Nice link!

Here's one I stumbled across years ago that includes pressure/temp/fill dependencies for CO2 in a tank.

Image

To the paintball folk out there: Yes, HPA or CO2 guns can be equally consistent if you design your system right. I took a POS entry level blow back gun and put a stiff spring in it so that it ran 290 fps at about 350 psi. Look at the above chart and see where 350 psi gets you.... Basically, as long as there was no snow on the ground, that gun was rock solid. Shots were +/- about 4 fps. On an entry-level gun.
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Unread postAuthor: hoss.josh » Wed Feb 03, 2010 2:39 pm

What are your thoughts on liquid co2 creating problems in a regulator. My thoughts have been that the reason that the cobalt reg malfunctioned was because of liquid co2 getting into the regulator. Also when this happened there was a thick layer of ice formed on the bottle.
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Unread postAuthor: D_Hall » Wed Feb 03, 2010 2:59 pm

hoss.josh wrote:What are your thoughts on liquid co2 creating problems in a regulator. My thoughts have been that the reason that the cobalt reg malfunctioned was because of liquid co2 getting into the regulator. Also when this happened there was a thick layer of ice formed on the bottle.


1) Buy a regulator designed for CO2. Different regs use different materials for the O-rings/seals. Not all materials hold up to cold temps well. Those that are made for CO2 *will* hold up. As such, liquid CO2 won't really hurt them.

2) Oh, one other thing that helps is to use an "expansion chamber" after the reg. At least, I think that's what they call 'em in the paintball world. Mind you, an "expansion chamber" by itself is virutally worthless, but downstream of a regulator they provide for a small pneumatic accumulator that will help smooth out any "bumps" in the operation of the regulator.
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Unread postAuthor: rcman50166 » Sat Feb 06, 2010 11:31 am

hoss.josh wrote:Weather hasn't cooperated with me at all... plus I forgot my buddy has the reg right now. Should have results by today or tomorrow. i'mm make sure to pm you when i do


It's been 3 days now...
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Unread postAuthor: turner » Sat Feb 06, 2010 4:52 pm

all high pressure paintball tanks have bust disks so if the regulator ever malfunctions they will pop.you could get a really cheap ninja steel tank for like $35 and put the low pressure shims on it to bring it down to 450psi it thats low enough. the cheapest rough for a regulator is mabye a tank into an asa, then a empire dominator inline reg that are about $13, then another asa that will bring it to 1/8 npt.
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Unread postAuthor: D_Hall » Sat Feb 06, 2010 5:09 pm

turner wrote:all high pressure paintball tanks have bust disks so if the regulator ever malfunctions they will pop.

Yes, but do those disks pop at say 200 psi? 'Cause the guy who started this thread was interested in sprinkler valves. If the sprinkler valve pops before the disks pop, then the disks accomplish nothing.

Of course, CO2 has the same problem.

Thus why one needs to be very careful when using high pressure gas sources with low pressure components.
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Unread postAuthor: hoss.josh » Sat Feb 06, 2010 5:13 pm

They pop at like 1500 psi... he would have to put a separate pop off valve to allow it to be safe for the sprinkler valve... as for the testing weather and classes have kept me to busy to meet my buddy who has the reg right now... we're working on finding some time to do it but it could be a couple of days still... if anyone else has the setup in question feel free to test it out and let us know... sorry about the delay but as i said classes are killing me right now
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