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Old 11-16-2006, 06:09 PM   #1
Ol' Grog
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Default Refrigerated CO2

Well, for now at least, I got one keg and my 10 pounder CO2 tank in the 4912. Notice, which I know will happen, that the pressure drops, A LOT. If I have my regulator set at 12 psi inside the refrigerator, am I really getting 12 psi to the keg? When they were warm, I dropped it to 12, but it changed when it got cold.

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Old 11-16-2006, 06:17 PM   #2
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The regulator is right. Since the cold tank has less pressure in it, the regulator will need to be readjusted. Think of it like a garden hose hooked up to a hand sprayer. If you adjust the sprayer to the desired flow with the water turned on fully, and then you turn down the water pressure at the spigot, you'd have to readjust the sprayer to get the same flow.

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Old 11-17-2006, 02:32 AM   #3
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If you are keeping the gas turned on, the pressure should not vary in your keg. CO2 tank yes, keg no.

The regulator's sole function is to keep output pressure (not flow as mentioned above) constant irrespective of the input pressure.

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Old 11-17-2006, 02:38 AM   #4
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I've had the same problem in the past. My tank was filled at 1000 PSI, when refrigerated, it dropped about to about 550.

Regardless, the regulator will keep you honest, and keep the desired amount of CO2 on the beer.

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Old 11-17-2006, 02:40 AM   #5
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Whatever the regulator reads on the outlet side is the pressure your keg has in it. Adjust it back to 12 and check it again in a few hours.

When you put the cylinder/regulator in the fridge, the regulator setting that worked at room temperature will result in a too low an outlet pressure when cold. A chilled regulator tends to be a bit finicky, but there's nothing wrong with it being cold as long as you adjust it properly.

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Old 11-17-2006, 02:41 AM   #6
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Quote:
Originally Posted by Ol' Grog
Well, for now at least, I got one keg and my 10 pounder CO2 tank in the 4912. Notice, which I know will happen, that the pressure drops, A LOT. If I have my regulator set at 12 psi inside the refrigerator, am I really getting 12 psi to the keg? When they were warm, I dropped it to 12, but it changed when it got cold.
The setting for 12 psi cold and 12 psi warm are two different things. Adjust the setting when the temp stabilizes and all will be well in the world
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Old 11-17-2006, 02:56 AM   #7
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Quote:
Originally Posted by rdwj
The setting for 12 psi cold and 12 psi warm are two different things. Adjust the setting when the temp stabilizes and all will be well in the world
10-4.. . .

Agree completely.
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Old 11-17-2006, 04:46 AM   #8
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Quote:
Originally Posted by Yuri_Rage
When you put the cylinder/regulator in the fridge, the regulator setting that worked at room temperature will result in a too low an outlet pressure when cold.
Explain please- what's the physics behind this?
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Old 11-17-2006, 05:04 AM   #9
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Quote:
Originally Posted by Mikey
Explain please- what's the physics behind this?
Simple - the Ideal Gas Law - pressure and volume vary with temperature. Given the same gas volume, pressure will lower proportionally with temperature.
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Old 11-17-2006, 05:27 AM   #10
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