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Old 10-19-2009, 05:42 PM   #1
Sep 2009
Amherstview, Ontario, Canada
Posts: 139

Does anyone know of any trick to tell how much CO2 is left in a cylinder? I have two tanks they both show 750 pound on the regulator however One was filled a little while ago and the other I got with some gas in it. I have heard that as long as the have liquid CO2 in them the pressure stays about the same? Is this true?

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Old 10-19-2009, 05:58 PM   #2
Dwain's Avatar
Feb 2009
Hill Country, TX
Posts: 1,135
Liked 5 Times on 5 Posts

Weigh them. I don't remember what they are suppose to weigh. Call your gas supplier and thy'll tell you. The bottles might be stamped with th tare weight (T.W.). Luck - Dwain

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Old 10-19-2009, 06:11 PM   #3
More Humann than human
humann_brewing's Avatar
Oct 2008
the sun
Posts: 15,535
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dwain has it right, get the tare weight of the cylinder, usually on the top portion labeled T W, then get a scale and subtract the tare weight from the scale weight. Don't try to rely on the pressure reading as it varies a lot depending on what temp you have it at.

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Old 10-19-2009, 06:15 PM   #4
david_42's Avatar
Oct 2005
Oak Grove, Oregon, USA
Posts: 25,599
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I have heard that as long as the have liquid CO2 in them the pressure stays about the same? Is this true?
Correct. Until you get to the running on fumes stage, tank pressure is a function of temperature. On the other hand, when the gauge hits 300 psi, start planning on getting more. With two tanks, I just run one down, then stick it in the van. My supplier is 25 miles away, so I'm not willing to make a special trip, but I get out there 3-4 times a month.

Even with a #5 tank, the fumes will push a couple cornies or carbonate one.
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Old 10-19-2009, 07:24 PM   #5
Jul 2009
Chelmsford, MA
Posts: 1,203
Liked 74 Times on 55 Posts

Most 5# tanks weigh about 17# when they're full, but it can vary. Finding the tare weight and subtracting from the total weight is the best way.

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