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Thread: Another newbie question

  1. #1
    Join Date
    Sep 2005
    Posts
    669

    Another newbie question

    This is an easy one (I think):

    I'm going to crash a 15bbl conical from 70 down to 32, all in one shot, and wonder how much CO2 to add to the fermenter to keep it from having negative pressure inside as it cools.

    As a side note, is that kind of a crash enough to crumple my fermenter if I don't add the CO2?

  2. #2
    Join Date
    Jul 2006
    Posts
    78

    Negative pressure

    It is always good to check your under and over pressure valves every time you clean your fermenter.
    Do not worry about your tank imploding. For a 15bbl tank from 70F to 32F your change in volume is going to be just under half a gallon. On a 15bbl volume it can be ignored.

    BelgianBrewer
    www.sbmbrew.com
    Last edited by BelgianBrewer; 04-05-2008 at 12:39 AM.

  3. #3
    Join Date
    Sep 2005
    Posts
    669
    Cool. I was going to just close the blowoff/CIP arm, crash it, and when it reaches 32, add CO2 until I have + pressure. Is that more-or-less the standard procedure?

  4. #4
    Join Date
    Apr 2004
    Location
    Hastings, MI, USA
    Posts
    263
    For a crash to 32F, I'd usually cap, add .5 psi to the tank and relax
    "By man's sweat and God's love, beer came into the world" -- St. Arnold of Metz

  5. #5
    Join Date
    Oct 2003
    Location
    Pittsburgh, PA
    Posts
    407
    <Maybe Rob just said this>

    It's okay to add the pressure to the tank BEFORE cooling, so you have a bit of play to work with... or even cap the fermenters before the FG is reached, saving some of the natural carbonation and pressure.

    Cheers,
    Scott

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