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Thread: Vacuum?

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  1. #1
    Join Date
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    Default Vacuum?

    (Hopefully) finishing up my first batch of mead - started in Oct. Most everyone I've talked to and read has said that after it's done bubbling, let it sit another month or so to ensure that it is truely finished. When I looked yesterday, the airlock was pulling the water toward the carboy. Not enough so far to actually round the curve and enter the carboy, but the 'closer' water chamber is higher than the 'farther' one, indicating some sort of vacuum. Is this normal or a bad sign? Thanks.

  2. #2
    Join Date
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    Default Re: Vacuum?

    Since there isn't any fermentation your airlock is simply reacting to the volume changing because of temperature fluctuations. IMO
    BeeCurious
    Trying to think inside the box...

  3. #3
    Join Date
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    Default Re: Vacuum?

    Beecurious is right on.... temperature (and resultant volume) changes, barometric pressure, etc. This is one reason S-type airlocks are more popular than 3-piece.
    Bees, brews and fun
    in Lyons, CO

  4. #4
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    Default Re: Vacuum?

    Quote Originally Posted by Ben Brewcat View Post
    Beecurious is right on.... temperature (and resultant volume) changes, barometric pressure, etc. This is one reason S-type airlocks are more popular than 3-piece.
    Won't the S-tube suck the airlock liquid back into the carboy?

    I don't see how the one would be prefered.
    BeeCurious
    Trying to think inside the box...

  5. #5
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    Default Re: Vacuum?

    Quote Originally Posted by BeeCurious View Post
    Won't the S-tube suck the airlock liquid back into the carboy?

    I don't see how the one would be prefered.
    Apply pressure in each direction to it and it'll be clear. The S-style, or double-bubble, bubbles in either direction as the gas passes through the narrow and into the reservoir on each side. The three-piece (stem, cap and lid) is the one that can suck liquid back into the carboy.
    Bees, brews and fun
    in Lyons, CO

  6. #6
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    Default Re: Vacuum?

    My work takes me away for weeks at a time so I can't baby-sit airlocks. My three piece airlocks have a line molded into them that I mistakenly assumed was intended to indicate a "full mark".

    If filled to that level there is enough liquid in the airlock that some can be sucked into the carboy.

    To avoid that, I fill the 3-piece airlocks to about 3/8" below the misleading line.

    One could always over fill the 3-piece airlock with their favorite booze and then "adjust" the level...
    BeeCurious
    Trying to think inside the box...

  7. #7
    Join Date
    Apr 2009
    Location
    Wash Co., Ohio
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    117

    Default Re: Vacuum?

    Ahhhh.....basic physics to the rescue.
    Nice to know the last 5 months haven't been in vain.
    Thanks guys!

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