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Re: [APD] CO2 Systems
The filling ratio for CO2 tanks 2/3rd the volume with liquid CO2.
It will not matter if your CO2 tank is inclined a bit, liquid CO2 will
not enter the regulator, but believe me, If liquid CO2 does get into the
regulator it will get throttled down to 2 kg/cm2 pressure from the 58-60
kg/cm2 in the tank and liquid CO2 will expand far more than gas (it is
gas that normally expands in all our systems).
It's good no one has bothered to find out what really happens once
liquid CO2 enters the regulator.
I have used CO2 fire-extinguishers on fires, and it's the liquid under
pressure that is expanding when it emerges out of the hand held nozzle
of the extinguisher. Not a safe situation with your aquarium and
> If you want to be sure only gas comes out the valve and not liquid CO2 (which would would immediately turn to gas at it passed the valve at the low flow rates used for aquatic gardening), then you need to have the tank upright only enough that the liquid CO2 is not covering the valve opening. Since most CO2 tanks are "filled" only to about half their volume capacity or less, you could have a tank nearly completely on its side and only have gas come out the valve. Some compressed gas tank mobile racks support the tanks at about 45 degrees.
> In practice, even when freshly filled, if a tank was raised only a little off its side, only gas would go through the valve.
> There was some speculation previously that, if a tank was on its side, liquid CO2 would go into the regulator and freeze it or damage it as it expanded. I don't think anyone tried this to find out if it was true.
> There are certain dangers with compressed flammable or highly corrosive gas tanks being operated horizontally and at much higher flow rates that we use for aquatic gardening.
> * * * * * * * * *
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> Details are posted at http://www.aquatic-gardeners.org/convention.html
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