CO2 tank in Fridge: Pressure reading - Home Brew Forums
Register Now For Free!

Home Brew Forums > Home Brewing Beer > Bottling/Kegging > CO2 tank in Fridge: Pressure reading

Reply
 
Thread Tools
Old 04-15-2010, 12:03 PM   #1
Dave46382
 
Dave46382's Avatar
Recipes 
 
Feb 2010
Indiana
Posts: 110
Liked 4 Times on 3 Posts



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.

 
Reply With Quote
Old 04-15-2010, 12:12 PM   #2
beerthirty
big beers turn my gears
HBT_LIFETIMESUPPORTER.png
 
beerthirty's Avatar
Recipes 
 
May 2008
Podunk, VA. Not far from the NC line.
Posts: 2,589
Liked 33 Times on 14 Posts


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.
__________________
Quote:
Originally Posted by the_bird View Post
"I've got a fever... and the only prescription is, MORE CARBOYS!"
primary- Tangerine Dream, SWMBO slayer,
serving- amber ale hop experiment #6, Roggenbier, apfelwine
planning- Cru?
conditioning- 9/9/09 barleywine
Drink water?... Never, fish fornicate in it.--- W.C. Fields
Most problems can be solved with the proper application of force.

 
Reply With Quote
Old 04-15-2010, 12:44 PM   #3
bctdi
Recipes 
 
Mar 2009
N.W. Atlanta Metro,GA
Posts: 248
Liked 10 Times on 8 Posts


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.

 
Reply With Quote
Old 04-15-2010, 12:48 PM   #4
SweetSounds
 
SweetSounds's Avatar
Recipes 
 
Jan 2010
Des Moines, Iowa
Posts: 1,425
Liked 20 Times on 19 Posts


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
__________________
Quote:
Originally Posted by Ecnerwal View Post
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!

 
Reply With Quote
Old 04-15-2010, 04:45 PM   #5
Dave46382
 
Dave46382's Avatar
Recipes 
 
Feb 2010
Indiana
Posts: 110
Liked 4 Times on 3 Posts


Thanks!

 
Reply With Quote
Old 11-14-2010, 02:06 PM   #6
doubleb
Recipes 
 
Aug 2007
Milford, CT
Posts: 239
Liked 1 Times on 1 Posts


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.
__________________
Next:
Primary:Hoppiness
Secondary:
Kegged:Brown Ale
Bottled:

 
Reply With Quote
Old 11-17-2010, 01:27 AM   #7
Screw991le
Recipes 
 
Feb 2008
Boston, MA
Posts: 107
Liked 1 Times on 1 Posts


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.

 
Reply With Quote
Old 06-02-2012, 10:21 PM   #8
kman42
Recipes 
 
Oct 2009
San Diego
Posts: 82

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.

 
Reply With Quote
Old 06-02-2012, 10:28 PM   #9
johnsma22
HBT_SUPPORTER.png
 
johnsma22's Avatar
Recipes 
 
Jun 2006
Taunton, MA
Posts: 1,967
Liked 82 Times on 61 Posts


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.


__________________
Cheers,
John

 
Reply With Quote
Old 06-02-2012, 10:43 PM   #10
kman42
Recipes 
 
Oct 2009
San Diego
Posts: 82

Funny. I saw your answer in another thread when searching.

 
Reply With Quote
Reply
Thread Tools


Similar Threads
Thread Thread Starter Forum Replies Last Post
New CO2 tank reading nearly empty blisterman Bottling/Kegging 3 01-23-2010 11:45 PM
CO2 Tank Pressure beilber Equipment/Sanitation 6 07-26-2009 05:55 PM
Pressure of CO2 tank inside fridge alexeygu Bottling/Kegging 3 03-31-2009 09:46 PM
Help reading Co2 tank conpewter Bottling/Kegging 1 05-28-2008 04:00 PM
CO2 tank outside fridge - regualtor inside fridge? ghart999 Bottling/Kegging 20 03-06-2008 04:32 PM


Forum Jump