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CO2 Reg ST's Version

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CO2 Reg ST's Version

Unread postAuthor: saladtossser » Sat Oct 15, 2005 8:03 pm

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Unread postAuthor: sergeantspud2 » Sat Oct 15, 2005 8:48 pm

about how many gallons is a 20oz co2 equal to at 120 psi don't know how to do that math.
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Unread postAuthor: saladtossser » Sat Oct 15, 2005 9:00 pm

if u said 100psi, then 80oz, i thing.

crap, not enough to use for bbmg, damnity damn damn unless i calculated wrong
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Unread postAuthor: sergeantspud2 » Sat Oct 15, 2005 10:49 pm

so that wouldn't run air tools thats only like 2 gallons i think?
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Unread postAuthor: saladtossser » Sun Oct 16, 2005 9:20 am

there is a way to add more tanks to it, but that will take some money, a lot of money.
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Unread postAuthor: sergeantspud2 » Sun Oct 16, 2005 10:40 am

i know of a way that it will cost about $20 to add one more tank
An asa to 1/8 adapter
then a brass 1/8 T then two of these to connect to the tanks. so thats like $13 plus the brass fittings
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Unread postAuthor: saladtossser » Sun Oct 16, 2005 7:57 pm

what about the $50 for another 20oz tank?, it will take 4 to match a 2 galleon
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Unread postAuthor: sergeantspud2 » Sun Oct 16, 2005 8:15 pm

i get them for $30 prefilled at a paintball store or on the internet for $20. sory i assumed you had a few, i have 4 co2 tanks from paintballing
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Unread postAuthor: joemama » Thu Jan 19, 2006 8:09 am

so dose this reg atoumaticly refill the gun after i shot it
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Unread postAuthor: saladtossser » Thu Jan 19, 2006 4:51 pm

yea, it will, there is nothing to control it.
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Unread postAuthor: boilingleadbath » Thu Jan 19, 2006 6:41 pm

Ah, I do believe the CO2 is stored as a liquid... thus, you get the same type of thing happening as with steam - 1oz (mass) will provide you with something like 15 gallons at one atmospehere (14.7 psi).
*the above example is for steam, not CO2. The formula for CO2 can be found in the <a href="http://www.spudfiles.com/forums/viewtopic.php?t=244&">CO2 sticky</a>
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Unread postAuthor: a41capt » Thu Feb 09, 2006 9:49 pm

CO2, like water converting to steam, boils at it's boiling point which is -78.5C. Like all gases stored as liquids under pressure, when they get cold due to rapid expansion (flash boiling), their pressure drops at an inverse curve causing radical pressure reduction. Flash boiling (and the subsequent temperature/pressure drop) occurs when the CO2 pressure is dropped rapidly, as it does during prolonged release. Just feel the outside of a CO2 cylinder after flowing gas for a few seconds.

For this reason, CO2 is usually not a first choice for a stored propellant gas in a BBMG firing through a cloud or vortex type of mechanism (constant, high rate gas flows).

However, a rear (or front?) acting piston cycle action with it's reduced rate of fire (10-20 RPS or so) will fare slightly better and deliver more constant pressures throughout the length of the firing period. It also requires a smaller cylinder and less weight...
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Unread postAuthor: drac » Thu Feb 09, 2006 10:06 pm

a41capt wrote:CO2, like water converting to steam, boils at it's boiling point which is -78.5C. Like all gases stored as liquids under pressure, when they get cold due to rapid expansion (flash boiling), their pressure drops at an inverse curve causing radical pressure reduction. Flash boiling (and the subsequent temperature/pressure drop) occurs when the CO2 pressure is dropped rapidly, as it does during prolonged release. Just feel the outside of a CO2 cylinder after flowing gas for a few seconds.

For this reason, CO2 is usually not a first choice for a stored propellant gas in a BBMG firing through a cloud or vortex type of mechanism (constant, high rate gas flows).

However, a rear (or front?) acting piston cycle action with it's reduced rate of fire (10-20 RPS or so) will fare slightly better and deliver more constant pressures throughout the length of the firing period. It also requires a smaller cylinder and less weight...


:shock: :shock: :shock: :shock:

English please, my brain cannot comprehend. :(

But you sound like you know what you're talking about.
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Unread postAuthor: CS » Thu Feb 09, 2006 10:55 pm

I got it for the most part. Although I didnt know what "flash boiling" was, he did a good job of explaining. Although, this post is a bit late... Defintly good info though. Im not sure what he was getting at in the last post. How would you get a constant pressure during the whole process when it has to expand to propel the projectile? BLB has a brother!
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Unread postAuthor: a41capt » Fri Feb 10, 2006 12:18 pm

Sorry, didn't mean to sound obtuse, I'm a fire captain/paramedic and hazmat technician with a background in (of course) chemistry. The constant pressure is achieved through the use of an inline regulator, but like all single stage regulators, it is impossible to achieve pressures higher than the supplied pressure. That's why, when the compressed (liquified) gas boils and the temperature falls, the pressure drops to a level below that of expected operational needs.

The regulated pressure then also drops below final delivered pressure needs.

A "Flash Boil" occurs when a liquified gas is exposed to tempoeratures and pressures above its boiling point rapidly. Think of water being poured onto a superheated plate of steel, or water being taken into the vacuum of space. Instant vaporization and molecular separation/expansion.
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