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CO2 meter consept

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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CO2 meter consept

Unread postAuthor: Bluetooth » Thu Jan 11, 2007 8:51 pm

Could you make something that has a paintball CO2 tank then something like a propane meter then your gun and you make the fuel meter so at whatever PSI your tank is at when the meter is filled it will like pressureize you gun to like 100 PSI or whatever you want. So basicly is like a propane fuel meter just instead of propane, CO2 and instead of filling your chamber to a certain percentage you fill it to a certain PSI. Iay eallyray opehay omeonesay understandsay isthay :roll: .
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Unread postAuthor: frankrede » Thu Jan 11, 2007 9:09 pm

propane meters aren't rated that high are they?
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Unread postAuthor: Bluetooth » Thu Jan 11, 2007 9:22 pm

If you make them out of steel they might be.
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Unread postAuthor: mark.f » Thu Jan 11, 2007 9:29 pm

We all thought of something like this over the summer. Only problem is if you forget to close a valve or leave the first one open just a little you're screwed.
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Unread postAuthor: Bluetooth » Thu Jan 11, 2007 9:46 pm

Oh yeah or you could calc it wrong and kill yourself. You would notice and be like "Oh crap :cry: ". You would need a rupture disk like in a paintball reg incase it went too high.
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Unread postAuthor: Brian the brain » Fri Jan 12, 2007 12:40 pm

The concept works, it's just a little dangerous. A safety pop off valve would solve the problem with overfilling your chamber.

I see another hazzard.Is anybody really sure steel pipe&fittings can safely take 900 psi??
The metered amount will be at 900 psi the moment the first ballvalve is opened.

That's the part that scares me.If that riddle can be solved ( anybody with data, please respond!!)
It would make a regulator unnessesary, if it could be made in a safe way.
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Unread postAuthor: Scope » Fri Jan 12, 2007 12:50 pm

How about you just buy a Co2 tank and a regulator... you can get a low pressure regulator (highpressure wont drop that low) for like 70$
or just buy a HPA tank (compressed air at 4500psi) with an adjustable regulator on it (like 150$)
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Unread postAuthor: CS » Fri Jan 12, 2007 3:40 pm

Wow, I can't remember how many of times I've brung this point about in CO2 discussions. A major problem with exposing ball valves to a 'freezing liquid' is that it can possibly freeze your valves up. I don't think I have to go out on a stint as to why thats bad.

Just spend some money, and buy the damn real thing! No sense in chancing your safety on something you whipped up for 5$ with Gorilla glue, duct tape, and paper towels.

*wishes that all discussions of homemade CO2 regulators stopped*
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Unread postAuthor: Bluetooth » Fri Jan 12, 2007 6:10 pm

But I don't have that kinda money :cry: . I'm just gonna use 12gs.
P.S. It's brought not "brung" :wink: .
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Unread postAuthor: MrCrowley » Fri Jan 12, 2007 6:27 pm

I saw a regulator on www.trademe.co.nz thats has a maximum input of 3300psi and can reg down to 300psi for $75NZD($40US)
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Unread postAuthor: Scope » Fri Jan 12, 2007 6:41 pm

12g are still 800 psi... so unless your calculate everything out and have the right temperatures and altitude you ahve a chance of pverpressuring.
you could do all the calulations and find out how much space it would take 12g of co2 to expand to say 100 psi.... but then temperature would have a good amount to do with it because when co2 expands it gets cold. Which will make w.e you are using brittle. Also when co2 is cold it doesnt fully expand but leave it out in the sun and it will jump in psi. I kno that a 20oz coz tank can go from 700 psi up to 900 psi, and at room temp are about 800psi
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Unread postAuthor: Bluetooth » Fri Jan 12, 2007 6:50 pm

Yeah I would calc it right and its 89*F here in our Floridian winter so I'm not caring much about expansion problems.
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Unread postAuthor: pyrogeek » Fri Jan 12, 2007 10:16 pm

Don't be an idiot and cheap out. Your hospital bills will be higher than what it would have costed to do it right in the first place.
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Unread postAuthor: noname » Fri Jan 12, 2007 11:20 pm

If you do make one of these, assuming you're using steel pipe and ball valves, as a pop-off valve, I'd recommend using a 1/2" or 3/4" union with burst disk. A pop-off valve lets air out WAY too slowly for 900 psi coming in. The valve would be letting out air, but the pressure would still spike to over 500 psi.
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Unread postAuthor: meatballs » Thu Mar 29, 2007 4:44 pm

Just use a simple shut off valve that's rated for CO2, and put a 100 psi pop off valve on the pressure reservoir. pressurize it until air starts leaking out of the pop off valve starts letting CO2 escape, then you know you're at pressure. also, install a pressure gauge so you know where you're at. with that setup you wont over-pressurize, and you wont need a regulator.
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