General Category > Kegging and Bottling

CO2 Pressure vs Temperature Chart

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Jimmy K:

--- Quote from: SecondRow_Sean on January 28, 2013, 12:32:50 PM ---
--- Quote from: mtnrockhopper on January 28, 2013, 12:29:20 PM ---It is the temperature of the beer that matters, not the temperature of the tank.

--- End quote ---

Right, but the temp of the tank affects the reading on the gauge. I'm just trying to determine how much, if any, I need to adjust.

--- End quote ---
The temp of the tank affects the high pressure reading because a fixed quantity and volume of gas at a lower temperature has lower pressure. This does not affect the low pressure gauge because the quantity of gas on the low pressure side is not fixed. The regulator will let gas through until it reaches 10psi (or whatever). No temperature adjustment is needed.
 
If you think about it, the CO2 on the low pressure side (in the keg) is always at serving temperature regardless of where the tank is.

SecondRow_Sean:

--- Quote from: mtnrockhopper on January 28, 2013, 12:38:15 PM ---
--- Quote from: SecondRow_Sean on January 28, 2013, 12:32:50 PM ---
--- Quote from: mtnrockhopper on January 28, 2013, 12:29:20 PM ---It is the temperature of the beer that matters, not the temperature of the tank.

--- End quote ---

Right, but the temp of the tank affects the reading on the gauge. I'm just trying to determine how much, if any, I need to adjust.

--- End quote ---
The temp of the tank affects the high pressure reading because a fixed quantity and volume of gas at a lower temperature has lower pressure. This does not affect the low pressure gauge because the quantity of gas on the low pressure side is not fixed. The regulator will let gas through until it reaches 10psi (or whatever). No temperature adjustment is needed.
 
If you think about it, the CO2 on the low pressure side (in the keg) is always at serving temperature regardless of where the tank is.

--- End quote ---

Excellent, now I understand. Thanks for the explanation.

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