How do I know if my tank is filled with CO2 and not something else? - Home Brew Forums
Register Now For Free!

Home Brew Forums > Home Brewing Beer > Bottling/Kegging > How do I know if my tank is filled with CO2 and not something else?

Reply
 
Thread Tools
Old 12-04-2010, 07:37 PM   #1
BrewVegas
Recipes 
 
Mar 2008
Las Vegas
Posts: 124


Got a tank off of craigslist. Looks to me in good condition and it's full. Guy said it was CO2, but I don't see any marks. How do I know its not Argon or something else?

 
Reply With Quote
Old 12-04-2010, 08:31 PM   #2
happytrails
Recipes 
 
Aug 2010
cali
Posts: 7

had the same delima, but i got mine from friend!
used for awhile but it gave us gas!
without a label u cannot tell whats inside!
so i took to a welding supply and exchanged for a good known unit w/co2~ cost aprox $12 bucks!!

 
Reply With Quote
Old 12-05-2010, 04:20 AM   #3
bowiefan
HBT_LIFETIMESUPPORTER.png
Recipes 
 
Nov 2009
Bowie Maryland
Posts: 470
Liked 7 Times on 7 Posts


The brown paint finish of the bottle indicates that it is a nitrogen tank. Could still be filled with co2 as the pressure requirements are lower for co2 than nitrogen. But for the cost of a trade in, why take the chance? Take it to a gas supply house and trade it in for a full one, as long as it is within hydro test date. (Pressure vessels are required to undergo hydrostatic pressure testing every 5 years, there should be a date stamped into the tank, that is the expiration date for it's last test.)

 
Reply With Quote
Old 12-05-2010, 05:50 AM   #4
RogerMcAllen
Recipes 
 
Apr 2009
Decatur, IL
Posts: 623
Liked 6 Times on 6 Posts


Looks like a CGA 320 CO2 fitting. It's been a while since I've been in the business of compressed gasses but I believe inert gases (N2, He, Ar, etc.) come with a CGA 350 fitting that looks completely different (It threads on the inside). I can't believe any shop would fill a CO2 tank with Nitrogen if for no other reason it would be easier to swap someone a tank than try to adapt their CGA 350 supply to a CGA 320 tank since you aren't really paying for the gas, you are paying for the guys time to actually fill the tank.

In the end, gas is cheap. Just swap the cylinder if you have any doubt.

 
Reply With Quote
Old 12-05-2010, 05:23 PM   #5
jmhart
Recipes 
 
Aug 2010
Atlanta,GA
Posts: 130

Yep, that's a CGA 320 filter. NO ONE would fill that with any other gas than CO2. CGA fittings are a safety protocal and while I'm not sure if it would be illegal to manipulate the system, I know it would open them up to any number of liability lawsuits.

Anyway, bottom line is that it's CO2.

 
Reply With Quote
Old 12-05-2010, 09:32 PM   #6
penutbuttrdeath
 
penutbuttrdeath's Avatar
Recipes 
 
Jun 2010
Arvada, Colorado
Posts: 53

put the gas in a balloon... if it floats away then you know its not co2

 
Reply With Quote
Old 12-06-2010, 02:07 AM   #7
david_42
 
david_42's Avatar
Recipes 
 
Oct 2005
Oak Grove, Oregon, USA
Posts: 25,597
Liked 155 Times on 145 Posts


One definite test, which wastes a fair amount of gas, tie a cloth bag over the outlet then open the valve. If dry ice forms in the bag, it's CO2. Very few gases have a solid state at atmospheric pressure.

Note: this is a good way to case permanent bodily damage.
__________________
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 12-06-2010, 02:12 AM   #8
chefmike
Recipes 
 
Dec 2007
north Georgia
Posts: 1,327
Liked 9 Times on 6 Posts


Quote:
Originally Posted by david_42 View Post
One definite test, which wastes a fair amount of gas, tie a cloth bag over the outlet then open the valve. If dry ice forms in the bag, it's CO2. Very few gases have a solid state at atmospheric pressure.

Note: this is a good way to case permanent bodily damage.

Now I wish I had a video feed for all of us home brew dorks who are now heading out to the keg fridge to try this with a tank.

ER's be on alert, we are armed with enough internet knowledge to be dangerous to ourselves!
__________________
Reformation Brewery: We went professional
Obsessing over: starting a local brewery (hence I am not here much these days!), Pickles, my wife, 3 year old and 6 year old
Reading: fall of giants by ken follett
Building: gardens, recipes, and trailer mounted smoker/ wood pizza oven

 
Reply With Quote
Old 12-06-2010, 02:15 AM   #9
dwarven_stout
Recipes 
 
Apr 2009
Boise, ID
Posts: 1,608
Liked 38 Times on 33 Posts


Quote:
Originally Posted by david_42 View Post
Note: this is a good way to case permanent bodily damage.
It's also a good way to make dry ice. ;-)
__________________
"I can't believe how many people think Air Lock is pronounced Hydrometer." -BigKahuna
"If you gave me a beer with placenta in it without telling me I would kick you in the nuts." -ODaniel
"We be in a big hurry for dope beer with much alcamahol and flavor, quality, balance, and aroma don't matter. We just wantz to be druck, u know?" -Yooper

 
Reply With Quote
Old 12-06-2010, 03:28 AM   #10
RogerMcAllen
Recipes 
 
Apr 2009
Decatur, IL
Posts: 623
Liked 6 Times on 6 Posts


Quote:
Originally Posted by chefmike View Post
Now I wish I had a video feed for all of us home brew dorks who are now heading out to the keg fridge to try this with a tank.

ER's be on alert, we are armed with enough internet knowledge to be dangerous to ourselves!
A slightly safer way to do is to shoot it out of a tight nozzle to make dry snow.

 
Reply With Quote
Reply
Thread Tools


Similar Threads
Thread Thread Starter Forum Replies Last Post
Filled my first CO2 tank and... LumberjackJohn Bottling/Kegging 6 03-19-2010 12:22 AM
How heavy is a filled 20oz tank? CanadianNorth Bottling/Kegging 12 12-24-2009 12:10 AM
How do I check the quality of a used co2 tank? ($5 co2 tank offer inside) MBasile Bottling/Kegging 10 09-15-2009 03:09 PM
Filled a pin with IPA... DubbelDach Bottling/Kegging 9 08-05-2008 05:25 PM
Is my co2 tank filled? photogscott Bottling/Kegging 1 02-13-2008 01:42 PM


Forum Jump