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| saladtossser |
 Posted: 10/15/2005 20:03 PM Post subject: CO2 Reg ST's Version |
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SpudZilla
Joined: 26 Mar 2005
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| sergeantspud2 |
| Posted: 10/15/2005 20:48 PM Post subject: |
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Captain
Joined: 07 Jun 2005
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| 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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| saladtossser |
| Posted: 10/15/2005 21:00 PM Post subject: |
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SpudZilla
Joined: 26 Mar 2005
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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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| sergeantspud2 |
| Posted: 10/15/2005 22:49 PM Post subject: |
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Captain
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| so that wouldn't run air tools thats only like 2 gallons i think? |
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| saladtossser |
| Posted: 10/16/2005 9:20 AM Post subject: |
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SpudZilla
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| there is a way to add more tanks to it, but that will take some money, a lot of money. |
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| sergeantspud2 |
| Posted: 10/16/2005 10:40 AM Post subject: |
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Captain
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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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| saladtossser |
| Posted: 10/16/2005 19:57 PM Post subject: |
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SpudZilla
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| what about the $50 for another 20oz tank?, it will take 4 to match a 2 galleon |
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| sergeantspud2 |
| Posted: 10/16/2005 20:15 PM Post subject: |
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Captain
Joined: 07 Jun 2005
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| 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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| joemama |
| Posted: 01/19/2006 8:09 AM Post subject: |
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Corporal
Joined: 13 Sep 2005
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| so dose this reg atoumaticly refill the gun after i shot it |
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| saladtossser |
| Posted: 01/19/2006 16:51 PM Post subject: |
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SpudZilla
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| yea, it will, there is nothing to control it. |
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| boilingleadbath |
| Posted: 01/19/2006 18:41 PM Post subject: |
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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 CO2 sticky |
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| a41capt |
| Posted: 02/09/2006 21:49 PM Post subject: |
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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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| drac |
| Posted: 02/09/2006 22:06 PM Post subject: |
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| 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... |
English please, my brain cannot comprehend. 
But you sound like you know what you're talking about. |
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| pimpmann22 |
| Posted: 02/09/2006 22:55 PM Post subject: |
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| 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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| a41capt |
| Posted: 02/10/2006 12:18 PM Post subject: |
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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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