whats the deal with liquid co2?

[killercrow]

i did some reading up on it, and guy states that it can reach like 6 or 8000 psi... if thats the case, why dont co2 bottles explode more often?
also, if you turned your gun upside down so that the powerlet was facing upside down, would you not be shooting liquid co2... hence blowing your gun up and killing yourself and other such nonsense? ive tried it... does nothing for performance

[ustilago]

Liquid CO2 is great stuff. The "It's gonna blow up and kill you" is mostly hype and misinformation. Mostly.

There has been one incident that I know of, of a PMI 9 oz tank that was not made with a burst disk (or the relief hole wasn't drilled. . .something like that). The tank was overfilled and left in a tent in summer heat. The tank failed, noone was injured.

I've seen velocity spikes of 40-50fps form a little bit of liquid getting into the valve of a paintball marker. Then again, if tuned correctly, I've seen amazing consistency and safe velocitied from using liquid.

Here's a couple of good links on CO2 dynamics:
But first, the chart. . .


And then an explanation of the chart. . .http://warpig.com/paintball/technical/g ... mics.shtml

Now, granted this information is more geared toward paintballers but it still applies to airgunning.

Anyway, Doc Nickel's tech article on Liquid CO2. . .http://www.docsmachine.com/tech/liquid.html

Personally, I consider HPA to be far more dangerous than CO2. Partly because of the higher pressures involved but mostly due to the outright ignorance and stupidity of some of the owners of such systems.

[supersundance]

you really need to know what your doing when playing with liquid co2 any co2 vessel is only filled to a certain part of full capacity by law say 60-70 percent (can,t remember) liquid co2 can make good power and not be as effected by temp but you really really need to know all the tricks or boom. no extra space can be anywhere and no shut off valves allowed these are just a few.

[sniper]

any co2 vessel is only filled to a certain part of full capacity by law say 60-70 percent (can,t remember)

by law?,
I have a 50 LBS tank CO2 fill-station, usually depends on temperature, in summer time I would fill up about 70% of the bottle capacity for most of my friends but for my self, I usually fill no less than 80%, if I'm going to use it right away, I would fill it upto 95%. I guess bottom line got to know a bit about co2 and use common sense.

[TCooper]

In 2000-2002 I had a 50 pound CO2 tank that I used with a TAU-7 and TAU-200. I always went for a good fill which was 150 grams in the 150g rated TAU bottles. At room temp that would give about 2/3 liquid. As long as we fill by weight we will be fine but I'm sure most experienced CO2 shooters know this already. Some new shooters might not be aware so this is for their benefit. Fill by weight and use a scale. If the bottle is rated for 12oz then it can be filled to 12oz in CO2 weight... no more.

Todd

[TCooper]

Here is an old posting that I saved from another forum. The author is Tim McMurray at Mac-1 Airgun. Tim gets full credit for his knowledge and research on CO2 properties.
---------------------------------------------------------------------------------

The pressure potential of 100% liquid CO2 in a pressure vessel at 85 degrees F goes off the chart.
100% @ 85F= 6000PSI
95% @ 85F= 4200
90% @ 85F= 3000
85% @ 85F= 2000
80% @ 85F= 1500
65% @ 85F= 1000

100% @ 50F= 3500 psi
95% @ 50F= 1800
90% @ 50F= 1100
65-85% @ 50F= 600 psi.

As you can see from the above data you'll essentially get a higher percentage that will still be self regulating at 50F so at that temp you can add a little volume without seeing extreme pressures. Once you hit 85% (even at 50F liquid) the pressure spikes bigtime. That is about 12 oz in a 10 oz tank.

85% blows the safety disc at 105F
90% blows the safety disks on tanks at 88F.
95% blows the disc at 68F
100% blows the disc at 43F

This is also when most valves are overwhelmed with pressure and lock up because the hammer doesn't have the energy to open it against the extreme conditions.

[killercrow]

thanks guys for the info... its all coming clear to me now

[Krazy Mike]

[Whitewolf]

Yes Mikey it can, my question for you is the tank #3000 psi or a #4500 psi. The #3000 would only require a bottle clamp and gun fitting for filling. A #4500 wiil require the same but also a regulator to knock down the 4500 to 3000 for a safe filling upon a gun.

To date there is no #4500 psi fill airguns on the market yet. But give it time once they can put it together to become IDIOT proof it'll happen give it a couple yrs

Later

[Voltar1]

Kim, some of the old SCBA esp industrial units were/are only 2216psi setups.
Just needed to add my 2 pennies.
Walter.....

[Whitewolf]

Yea I realize that, but was waiting upon a reply to find out want the scoop was.


O ya your 2 cents is always worth 2 cents he he lol

Later

[Voltar1]

Yea I realize that, but was waiting upon a reply to find out want the scoop was.


O ya your 2 cents is always worth 2 cents he he lol

Later

Thanks Bud, glad still worth that much teehee.....
Walter...
BTW that spare barrel one of the ones I did for you or another one?

[randyhub]

Well guys I have been using both HPA and Co2 now for over a year and I will say HPA is far more consistant and quite safe. I had the unfortunate experience of forgotting a full 9 oz CO2 bottle in a car during summer and guess what BURST DISK scare!! Since then my prerence is HPA I use HPA with my bulked 2240 Carbine now too. The result is year round consistant shooting. Yes 3000 psi is to be respected but so is 900 psi of temperture fluctuating CO2. Just remember the paintball industry is moving towards HPA, why because the 3000 psi is safely kept in check with any paintball regulator, it is consistant, and will not spike due to heat and does not eat seals like CO2. But I still use both HPA and CO2, just with my scuba tank fill station, Condor, Drozd, and 2240, it just makes more sense to have access to both propellants, as I took the time to have learned about both, and not get casught up in the HPA scare. Hell just look at the kids filling HPA tanks now and how many accidents have you heard of???

Randy