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  1. #14
    Join Date
    Sep 2008
    Location
    Western PA
    Posts
    25,545
    Couple things.

    First, CO2 is acceptable as a pressure testing and purge gas. Yeah, I know that some folks like nitrogen, but nobody has been able to provide consistent evidence against the use of CO2 as a purge gas or for pressure testing, so I continue to advocate for its use. Ideally, you would use "bone dry" CO2 and not soda fountain grade, but the difference is small in terms of moisture PPM and, as already noted, you're pulling a vacuum anyway, so a couple of PPM of moisture isn't that big of an issue.

    The tank pressure in a CO2 tank will be lower than that in a nitrogen tank, thus you can safely use a nitrogen regulator for it. Check the PT chart for R744.

    I need to get a new one as the threads are buggered on mine, but many farm stores or welding suppliers sell an adapter to fit a nitrogen regulator to a Co2 tank for under $20 and I'm pretty sure mine was under $10.

  2. #15
    Join Date
    Feb 2010
    Location
    In a boiler room
    Posts
    7,067
    Where's clover when you need him....

  3. #16
    Join Date
    Sep 2008
    Location
    Western PA
    Posts
    25,545
    Quote Originally Posted by Chuck View Post
    Where's clover when you need him....

    This is a torch that I've had to take up from "Uncle Clover"

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