Posted by: Tom Sparkman on January 14, 2003 at 11:27:29

: I have bought a refill station for Co2 tanks and want to make sure I am filling appropriately;I am having some problems finding information on the following. : -what % do you leave for expansion?? when refilling a tank;I have read somewhere that you should leave 35% of the tank empty to allow for expansion. : I have a 20 oz tank and this would equate to 13 oz. : I would rather be on the safe side.It is much more economical to refill tanks myself and my friends than at a store. : Thanks : tom You fill the tank by weight, not volume. When people say there should be 1/3 empty, they mean 1/3 of the volume. Fill a 20zo tank to 20oz using a scale (digital fish scales work good) and it will still have 1/3 vapor. Here's a how-to all about filling CO2 on Warpig: http://www.warpig.com/paintball/technical/gasses/co2dynamics.shtml And a chart to help you understand: http://www.warpig.com/paintball/technical/gasses/co2pv.gif Enjoy! Tom

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