CO2 Tank Tare Weight Markings?

[Toestr]

So I got this old tank in a lot, and it still has some CO2 left. The tank is long dead, but I'd like to use it for some testing or maybe some outlaw ball. I'd like to know the tare weight of the tank so I can weigh it and know approximately how much I have.

The only marking on the tank that I think could be the tare weight is pictured below, but I think it might be the fill weight (it's a 20oz tank). It's a Catalina cylinder, and when I looked at their website for what the markings are, it showed tare weight as xLBS/KG, and there was nothing like the marking shown.

If any of you old school guys who have dealt with filling one of these could help me I'd appreciate it.

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[pghp8ntballer]

I've never seen that before. But the tic-tac-toe/octothorp/pound symbol appears to be used in the traditional sense here as "pound(s)".

1.25 pounds = 20 ounces of high octane paintball go go juice.

Thats pretty nifty in the absence of a manufacturers label

[Toestr]

I've never seen that before. But the tic-tac-toe/octothorp/pound symbol appears to be used in the traditional sense here as "pound(s)".

1.25 pounds = 20 ounces of high octane paintball go go juice.

Thats pretty nifty in the absence of a manufacturers label

Ya, I had the same thought. Just thought the tare weight and fill weight might be the same by coincidence.

There is a label on the other side.

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[pghp8ntballer]

Got it.

I have an empty aluminum pure energy 20oz tank with a standard brass valve that weighs:

30.16 oz or 1.89 lb

I hope that helps!

oh and this tank actually has “20 OZ CO2” stamped into it with the DOT info

[Shaftski]

Catalina cylinders were marked..top row was max PSI (1800) and DOT-E. Second stamped line is mfg (catalina), division (mine say cliffdiv), bottle capacity in lbs, and type of gas permitted (CO2).

Only way to get true tare weight is to dump the tank and weigh it empty.

[SignOfZeta]

I don’t understand this question. You vent the tank and weigh it yourself, empty. Then you fill it and weigh that. That’s how you know. That’s the only way to know.

[Toestr]

I was under the impression that the tank has the tare weight stamped into it because I've seen videos with it and Catalina says on their website they do. Maybe they do, but just not for this size/age tank, idk, I've never used a CO2 tank before.

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[Shaftski]

Their larger cylinders may have tare weight stamped, but I've never seen tare stamped on smaller paintball use cylinders. I had a 20lb for a while and can't remember if it had tare indicated.

[SignOfZeta]

I was under the impression that the tank has the tare weight stamped into it because I've seen videos with it and Catalina says on their website they do. Maybe they do, but just not for this size/age tank, idk, I've never used a CO2 tank before.

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There’s no way for them to know that number is correct once it leaves the factory so IMO it wouldnt make any sense to put it on there. If you put a different design of valve in there it may weight more or less AND displace more or less volume which is potentially dangerous. A syphon on-off weighs double than what a standard pin valve weighs AND takes up more of the inside of the tank. The same tank can be overfilled with the same volume of CO2 if the valve changes. The valve is not a permanent part of the tank so putting a weight on the tank seems unwise.

The safest way to fill a tank is to empty it totally, then write down the dry weight SOMEWHERE ELSE so that it doesn’t get rubbed off during any chaos. Then when it’s filled you weigh it again and it should have gone up by about whatever the capacity is. I really only weigh the bottles static and alone, I don’t weigh as I fill and trust that. I mainly overfill and then once the bottle is off the rig I dump some to get about %15 below the max fill rating.