Author Topic: CO2 Pressure vs Temperature Chart  (Read 1262 times)

Offline SecondRow_Sean

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CO2 Pressure vs Temperature Chart
« on: January 28, 2013, 11:55:17 AM »
Just finished my keezer and my buffalo sweat clone is carbing as I type this. I'm going to put the CO2 tank inside, and I'm trying to find a pressure vs temp chart, to account for the lower tank temp, and I've been unsuccessful. Can anyone help me out, or does it not really matter at such low pressures?

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Re: CO2 Pressure vs Temperature Chart
« Reply #1 on: January 28, 2013, 12:14:05 PM »
A temperature change as small as we're talking about (maybe 30°F?) will have no noticeable effect. The beer would freeze or boil long before there was a perceptible difference.
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Offline tom

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Re: CO2 Pressure vs Temperature Chart
« Reply #2 on: January 28, 2013, 12:19:19 PM »
Here ya go. 
http://www.kegerators.com/articles/carbonation-table-pressure-chart.php
but if you are talking about the high pressure gauge you don't need to adjust for anything.
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Re: CO2 Pressure vs Temperature Chart
« Reply #3 on: January 28, 2013, 12:29:20 PM »
It is the temperature of the beer that matters, not the temperature of the tank.
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Offline SecondRow_Sean

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Re: CO2 Pressure vs Temperature Chart
« Reply #4 on: January 28, 2013, 12:32:50 PM »
It is the temperature of the beer that matters, not the temperature of the tank.

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.

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Re: CO2 Pressure vs Temperature Chart
« Reply #5 on: January 28, 2013, 12:38:15 PM »
It is the temperature of the beer that matters, not the temperature of the tank.

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.
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.
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Offline SecondRow_Sean

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Re: CO2 Pressure vs Temperature Chart
« Reply #6 on: January 28, 2013, 12:42:50 PM »
It is the temperature of the beer that matters, not the temperature of the tank.

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.
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.

Excellent, now I understand. Thanks for the explanation.