: A question for the techies:: I have read about a Co2 pump for filling tanks. According to the literature this will fill tanks automatically without the need to chill the tanks first thus not wasting Co2 and pulling almost everything out of a bulk cylinder. Also special tank valves with a quick disconnect nipple can be used so that you can fill easier.
: I run a small retail store and a field operator near me would like to find out more about this.
: Question is:
: I seems that the tank is filled without a scale. Normally Co2 is filled by weight, not pressure. How can the pump fill to the proper capacity without a scale? IS there something in the physics I am missing?
: Co2 pressure being variable with temperature, this seems like a contradiction.
: Is there anyone out there who uses one and can explain the mechanics of how it works?
: Thanks in advance.
When you fill a paintball CO2 tank from a bulk CO2 tank, the paintball tank has to be chilled to lower the pressure inside the tank *below* that of the bulk CO2 tank. If not, the paintball CO2 tank will be filled only with CO2 gas, not liquid CO2.
I would expect (not having seen or used one), that the CO2 pump actually draws the liquid CO2 up through the dip tube, irregardless of the pressure of the paintball CO2 tank you are filling.
I'd expect that you still need to know what the total weight of the tank + CO2 is, though, unless they are advising a guideline based on ambient temperature + output pressure from the paintball CO2 tank. The latter sounds a little scary to me.
CO2 isn't something to play around with--far more dangerous than HPA, due to CO2's volatility from temperature fluctuations.
=RT=
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