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Old 04-15-2010, 12:03 PM   #1
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Default CO2 tank in Fridge: Pressure reading

Just got my 20 pound CO2 tank filled. Made note of the position of the regulator gauge that 'supposedly' tells me how full my tank is.

Would taking the CO2 tank from room temp to 35-38 degrees F cause the gauge to read lower?

I have been on the hunt for a leak and can't find one. But the gauge looks like it's dropped since I put it in the fridge last night.

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Old 04-15-2010, 12:12 PM   #2
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the easy way to determine if you have a slow leak is to remove gas in QCs from the kegs, pressureize the system the turn off the gas at the tank. Periodically note the pressures of you gauges. with nowhere to go the pressure readings should not change over any amount of time. if the pressure drops it time to locate the leak. soapy water, strong starsan solution, or commercialy available leak detection sprays will find it. I prefer star san because you don't need to worry about cleaning the residue off as much as the other choices.

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Old 04-15-2010, 12:44 PM   #3
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yes pressure will drop with tempurature....it`s normal...inversely if the bottle was at 100 deg.f the pressure would increase.I keep mine out of the fridge and drilled holes in the side for the lines to save space.Someone told me once that keeping the regulator in the cold was not good for it....but I don`t know if there`s any truth to that....I just erred on the side of caution cause I want my regulator to last as long as possible.

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Old 04-15-2010, 12:48 PM   #4
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Pressure in the tank will indicate lower as the temperature of the tank drops. Mine usually read around 600 PSI at room temp and maybe a little over 400 in the keezer. It's nothing to worry about, and the same volume of gas is in the bottle. 450 PSI is still far more than the 10-14 you'll use to serve, and it'll last just as long as a tank at room temp.

RDWHAHB

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What does the primary pressure gauge on the tank tell us? That's right, the temperature. Put it on a scale if you want to know how much is in it...
Put some duct tape over the gauge - Or better yet - Replace the high pressure gauge with a plug - High pressure gauges are useless!
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Old 04-15-2010, 04:45 PM   #5
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Thanks!

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Old 11-14-2010, 01:06 PM   #6
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my tank is reading is 750 at room temp and now its right on the line between red and white which is 400 at 40 degrees F on my regulator. Its a 5lb tank. Should I be looking for leaks or just keep an eye on it?

BTW, this is my first kegged batch thanks for any help and thank you HBT.

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Old 11-17-2010, 12:27 AM   #7
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Quote:
Originally Posted by beerthirty View Post
the easy way to determine if you have a slow leak is to remove gas in QCs from the kegs, pressureize the system the turn off the gas at the tank. Periodically note the pressures of you gauges. with nowhere to go the pressure readings should not change over any amount of time. if the pressure drops it time to locate the leak. soapy water, strong starsan solution, or commercialy available leak detection sprays will find it. I prefer star san because you don't need to worry about cleaning the residue off as much as the other choices.
That is what I do. I unscrew the co2's know so none of the kids fool with it, but I keep the gauge "charged" to see if there are any leaks while I store the tanks.
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Old 06-02-2012, 10:21 PM   #8
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Why would you remove the QDs from the kegs? Wouldn't you want to know if the kegs have leaks? That's almost always where my leaks are.

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Old 06-02-2012, 10:28 PM   #9
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I started to post my patented response to the pressure/temp question that comes up every once and a while, then I noticed this thread was 2 years old!

Here it is for your viewing pleasure anyway, LOL!

CO2 in a liquid/vapor state has a direct pressure/temperature relationship, as can be seen in the chart below. The pressure will stay the same, at a given temperature, until all the liquid has been vaporized. Once only vapor exists, the pressure in the tank will drop rapidly. The only way to know for sure how much liquid CO2 is left in the tank is to weigh the tank, and subtract the tare weight that's stamped on the side of the tank.


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Old 06-02-2012, 10:43 PM   #10
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Funny. I saw your answer in another thread when searching.

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