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  1. #1
    Join Date
    Jun 2002
    Location
    Dacula, GA
    Posts
    12,471

    How much CF of gas can you get from a 20lb tank of CO2 gas?

    A refilled 20 lb tank of liquid CO2 costs about twice as much as a 40 CF tank of N2 gas.

    A full CO2 tank weighs about 45 lbs vs 30 lbs for a full N2 tank.

    You would also use your nitrogen regulator on the CO2 tank, It fits and the secondary gauge on the CO2 tank only goes to 60 psi. Not

  2. #2
    Join Date
    Oct 2004
    Location
    Central WA
    Posts
    1,471
    http://www.lmgtfy.com/?q=pound+of+co2+to+cubic+feet+gas

    The general consensus seems to be 8.7 cuft to one pound. For blowing stuff out it's CO2 all day, but for pressure testing and sweeping systems go with DRY N2.

    The boss wants us to use a regulator and blow kit for CO2, but at $5 a fill it's hard to justify buying the rig. I suppose I could get an adapter for my Nitro regulator, but I've never looked into it.

  3. #3
    Join Date
    Oct 2012
    Posts
    3,305
    I bought a co2 beverage regulator from foxx equipment. It was only like $40.

  4. #4
    Join Date
    Oct 2004
    Location
    Central WA
    Posts
    1,471
    Quote Originally Posted by Mike19 View Post
    I bought a co2 beverage regulator from foxx equipment. It was only like $40.
    Adapter and a piece of hose: FREE-99.

  5. #5
    Join Date
    Jun 2002
    Location
    Dacula, GA
    Posts
    12,471
    Quote Originally Posted by Mike19 View Post
    I bought a co2 beverage regulator from foxx equipment. It was only like $40.
    A nitro regulator goes right on a CO2 tank. Don't need a low pressure CO2 regulator.

    Next change out I'm going to install a sight glass and use CO2 for blow out, purging, pressure testing and evacuation to see if the glass shows any moisture. Will let every know.

  6. #6
    Join Date
    Oct 2012
    Posts
    3,305
    Quote Originally Posted by glennac View Post
    A nitro regulator goes right on a CO2 tank. Don't need a low pressure CO2 regulator.
    Really? The tanks we have are a different connection.

  7. #7
    Join Date
    Jun 2002
    Location
    Dacula, GA
    Posts
    12,471
    My tank is heavier and taller than the 40 CF N2 tank. It holds 20 lb liquid CO2 and cost $40 for a refill. The nitrogen regulator screws right on.

  8. #8
    Join Date
    Oct 2012
    Posts
    3,305
    This is the tank I've got. I believe its 20lbs as well.

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  9. #9
    Join Date
    Jun 2002
    Location
    Dacula, GA
    Posts
    12,471
    I guess my 20 lb CO2 tank holds 174 CF of gas which I'd a lot for one tank.

  10. #10
    Join Date
    Mar 2007
    Location
    wedged in freezer shelf
    Posts
    6,543
    Mike I got a Uniweld adaptor so my nitro reg screws on to the CO2 tank fitting.

    https://www.google.com/search?q=uniw...90439954631152
    “If You Can Dodge A Wrench You Can Dodge A Ball”

  11. #11
    Join Date
    Oct 2010
    Location
    Anderson, South Carolina, United States
    Posts
    6,372
    My nitro tank has female threads.

  12. #12
    Join Date
    Jun 2002
    Location
    Dacula, GA
    Posts
    12,471
    My tank also has female threads but looks like the same size. I just recently got my tank and used it once.

    What is your all's opinion on using it for purging and evacuation?

  13. #13
    Join Date
    Oct 2010
    Location
    Anderson, South Carolina, United States
    Posts
    6,372
    It should work fine, if you're going to pull a 500 micron vac on it then it shouldn't matter.

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