New kegger -- proper full co2 tank read? - Home Brew Forums
Register Now For Free!

Home Brew Forums > Home Brewing Beer > Bottling/Kegging > New kegger -- proper full co2 tank read?

Thread Tools
Old 04-24-2007, 01:27 AM   #1
Mar 2007
Bellefontaine, Ohio
Posts: 68

Hi all,
I'm new to kegging and just bought me first CO2 tank this past Friday. I bought the tank, had it filled and put it on my freshly kegged irish ale on Saturday. When I hooked it up, I noticed that the high pressure side of the regulator is measuring somewhere between 1,000 and 500 (i.e. get more gas). It's a 5lb tank.

I was thinking the gauge on a full tank would read more around 3,000. The tank and the reg. are in a 38 degree fridge, and I know that the temp has an effect on the CO2 and the reg, but should it register that low or did I get a short fill? By the way, I did the spray with soap solution to check for leaks and have none as far as I can tell.

Reply With Quote
Old 04-24-2007, 02:22 AM   #2
homebrewer_99's Avatar
Feb 2005
Atkinson (near the Quad Cities), IL
Posts: 17,796
Liked 136 Times on 102 Posts

Not sure what you mean, but with the tank hooked up to a keg you can turn the screw and the gage readings will change.
HB Bill

Reply With Quote
Old 04-24-2007, 02:35 AM   #3
Steel Comma Ale & Lagery
sause's Avatar
Oct 2004
Menomonee Falls WI
Posts: 1,866
Liked 18 Times on 13 Posts

Mine is about 600 psi when sitting inside of the fridge. Don't worry about it until the gauge says zero.
Originally Posted by Strange Brewer
Had some Bud Light analyzed once. They told me my dog had diabetes... And was pregnant

Reply With Quote
Old 04-24-2007, 02:44 AM   #4
WOP31's Avatar
Feb 2007
Posts: 1,342
Liked 14 Times on 7 Posts

You can't trust the gauges when the tank is in the fridge, they never work right. you'll have to take it out and let it warm up if you want to see how much gas you got.
"Yes, I am a pirate two hundred years too late. The cannons don't thunder there's nothin' to plunder,
I'm an [under] forty victim of fate, Arriving too late, arriving too late."
-Jimmy Buffet

Reply With Quote
Old 04-24-2007, 03:06 AM   #5
olllllo's Avatar
Apr 2006
Phoenix, Arizona
Posts: 13,330
Liked 140 Times on 114 Posts

You need to weigh it and subtract the tare to know how full it is.
Rabbit And Coyote Schwag
Rob - Phoenix Ambassador to Milwaukee
Where did your avatar go?
Ginger Beer for Moscow Mules Bacon Vodka

Reply With Quote
Old 04-24-2007, 03:17 AM   #6
johnsma22's Avatar
Jun 2006
Taunton, MA
Posts: 1,968
Liked 83 Times on 62 Posts

Like Rob said above, the only way to know how much CO2 is in your tank is to weigh it and subtract the weight of the tank.

There is a direct pressure/temperature relationship with compressed CO2. The pressure will stay exactly the same , at a given temperature, until all of the liquid has been vaporized. Once only vapor exists the pressure will drop rapidly. Here is a pressure/temperature chart for CO2 that shows that relationship.


Reply With Quote
Old 04-24-2007, 03:34 AM   #7
Mar 2007
Bellefontaine, Ohio
Posts: 68

Thanks for all the advice!

Reply With Quote
Old 04-24-2007, 03:43 PM   #8
david_42's Avatar
Oct 2005
Oak Grove, Oregon, USA
Posts: 25,599
Liked 158 Times on 148 Posts

Regardless of where you keep your tank, once you hit 300 psi, you are on vapors and need to refill.

3000 psi is where the safety valve pops. I'll told that it is exciting when this happens.
Remember one unassailable statistic, as explained by the late, great George Carlin: "Just think of how stupid the average person is, and then realize half of them are even stupider!"

"I would like to die on Mars, just not on impact." Elon Musk

Reply With Quote
Old 05-14-2007, 10:53 PM   #9
May 2007
Lansing, Michigan
Posts: 306
Liked 9 Times on 5 Posts

It's all about PV = nRT, baby.

Reply With Quote
Thread Tools

Similar Threads
Thread Thread Starter Forum Replies Last Post
Turn an empty CO2 Fire Extinguisher into a brewdog kegger tank?? sirsloop Bottling/Kegging 6 03-16-2012 08:55 PM
full boil with 20lb. propane tank red999 General Beer Discussion 22 10-18-2008 01:09 PM
want to be a kegger... colinwollmann Bottling/Kegging 38 06-05-2007 02:30 AM
new kegger here!! kfgolfer Bottling/Kegging 3 01-07-2007 02:04 PM
Newbie Kegger kilroy Bottling/Kegging 9 12-08-2005 11:56 PM

Forum Jump