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Old 12-01-2012, 01:19 PM   #1
wpopp
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Default shrinking co2?

Last night I attached a fresh 5lb tank of co2 to a keg of homebrew. The co2 tank was at room temperature, the beer was cold. It's a new keg setup. I tested for leaks with soap/water solution, no leaks. I set the gauge at 12 psi, and put the whole setup, tank included in the beer fridge. 12 hours later, the co2 tank gauge read 550 psi. It started at 800psi. Was the pressure drop due to the co2 being cold? I can't imagine using that much co2 in a 5 gallon batch of beer in 12 hours. Thanks for any help you can provide.

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Old 12-01-2012, 01:21 PM   #2
BxBrewer
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It's just cold

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Old 12-01-2012, 01:23 PM   #3
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Pressure drop was from the gas being cold. If you chill your tank before refilling, it will old more. With that said I have never had much luck with the high pressure side of the gauge being accurate anyway!

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Old 12-01-2012, 02:36 PM   #4
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Thanks for the info!

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Old 12-01-2012, 04:33 PM   #5
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Quote:
Originally Posted by br1dge View Post
Pressure drop was from the gas being cold. If you chill your tank before refilling, it will old more. With that said I have never had much luck with the high pressure side of the gauge being accurate anyway!
A proper fill will be by weight. It's easier to fill when it's cold, but you should be getting 5 pounds (if that's your tank size) either way. If they put more in there while the tank is cold, it could warm up on your drive home and blow the safety valve on the tank. A couple people have had that happen.

The high pressure gauge accurately tells you the pressure in the tank, but until all your liquid CO2 has boiled off, the pressure in the tank is unrelated to the amount of CO2 left. The only way to know is to weigh it.
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