How much gas is in the tank?

[jpmitch]

I have a small (40cf) tank of 75%argon 25%CO2. The gauge shows 1000 psi. Is there any way of telling how full the tank is? Thanks very much

[Rambozo]

I have a small (40cf) tank of 75%argon 25%CO2. The gauge shows 1000 psi. Is there any way of telling how full the tank is? Thanks very much

Those tanks are usually filled to around 2000 psi, so you are at about the halfway mark.

[jpmitch]

That's kinda what I thought. Thanks

[performance]

I've had them filled to 2700psi too...so you just have to check when you pick up the cylinder how much you have. Most places have a pressure tester they can screw in to test. Most of the time I insist on it, because you can get a "low" tank.

[Rambozo]

There are plenty of "limbo" gas dealers trying to see how low they can go, before the customers complain. I have one extra high pressure 4500 psi cylinder that no one will fill anymore to full pressure. I can't remember the last time I saw anything over 2500 psi, but it seems like my fill pressures have been slowly dropping for years. Temperature has an effect on pressure, too. So a cylinder needs to rest after filling to cool off before reading pressure. That's the nice thing about CO2, being a liquid, you fill by weight and can watch the scale as they are filled up. Less room for shenanigans by the gas dealer. It's a sad state of affairs when you have to check the pressure on every bottle you buy. I guess that's what the world is coming to.

[Kempy]

I have a small (40cf) tank of 75%argon 25%CO2. The gauge shows 1000 psi. Is there any way of telling how full the tank is? Thanks very much

The tank will have DOT 3AA 1800, 2015, 2265 or 2400 this is the pressure the tank is made for the format for a retest marking is: Month – Facility – Year – Plus Rating – Star Stamp. • The + symbol (Plus Rating) indicates that the cylinder qualifies for 10% overfill. • The H symbol (Star Stamp) indicates that the cylinder meets the requirements for 10-year retest, instead of a 5-year retest so a cylinder that is 2400 plus rated can be filled to 2640 psi @ 68 deg. F. so that could read around 2700 psig on the gauge.

[DaveO]

I've taken to pressure testing each one, only to save myself the hassle of getting it home, unloading it, and getting an unhappy surprise. The LWS is not too far but hours are not convenient, so I'm just trying to skip the aggravation.