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Thread: CO2 Volume Chart-Extended...

  1. #1
    Join Date
    Nov 2002
    Location
    Polson, Montana, USA
    Posts
    1,085

    CO2 Volume Chart-Extended...

    Does anyone have a CO2 volume chart (pressure and temp) that goes colder than 30degrees F and higher pressure than 15psi?
    Just wondering...

  2. #2
    Join Date
    Jun 2005
    Location
    Lexington, KY, USA
    Posts
    78

    CO2 calculations

    To go much beyond the current limits of the Zahm type (ASBC) charts out there you will need to use some algorithms. They are provided in the Main ASBC methods manual (but really only for 20 C) but the better fuller ones were published many years ago in the Wallerstein publications. It may take me some time to get at them but I can try and find that Wallerstein article if really neeed.

    I am also unsure as your comment about above 15 psi though.

    Gary.

  3. #3
    Join Date
    Oct 2003
    Location
    Pittsburgh, PA
    Posts
    407
    This one goes down to 30, and up well past 15psi. It's isn't pretty on my screen though - hopefully yours looks better.

    http://sdcollins.home.mindspring.com...rbonation.html

    Cheers,
    S

  4. #4
    Join Date
    Nov 2002
    Location
    Polson, Montana, USA
    Posts
    1,085
    Thanks, guys!
    Just what the brewer ordered!

  5. #5
    Join Date
    May 2004
    Location
    St. John's, Newfoundland, Canada
    Posts
    807
    For temps below 30, try heating the Zahm shaker gently under warm water (not hot!) for a few seconds, shake and read again.

    The temp/dissolved CO2/pressure relationship is linear so by gently heating, you can still get an accurate reading.

    I have also found this trick handy when doing nitro's with a low target CO2 range (1.2-2.1 vol, depending on style).

    Pax.

    Liam

  6. #6
    Join Date
    Oct 2004
    Location
    WA, Australia
    Posts
    38
    I think the best table I've seen is the one in the "Brewer's Handbook". I know it goes above 15psi (my BBT don't), but not sure if it goes below 30F.

    Allan
    Tanglehead

  7. #7
    Join Date
    Sep 2005
    Posts
    669

    Excel sheet

    Here's a link to an Excel sheet I made. It doesn't go down that low, but you can easily extend it so it does. It uses various different temp/press units also. YMMV.

    http://www.bitboxsoftware.com/files/ForceCarb.xls

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