Help Support Aussie Homebrewer by donating:

  1. We have implemented the ability to gift someone a Supporting Membership now! When you access the Upgrade page there is now a 'Gift' button. Once you click that you can enter a username to gift an account Upgrade to. Great way to help support this forum plus give some kudos to anyone who has helped you.
    Dismiss Notice

Fermenting Under Pressure

Discussion in 'General Brewing Techniques' started by wobbly, 12/7/12.

 

  1. Mya

    Well-Known Member

    Joined:
    19/11/18
    Messages:
    46
    Likes Received:
    23
    Gender:
    Male
    Location:
    New zealand
    Posted 9/7/19
    Some people use mylar balloons attached to the fermenter to collect CO2 so that when you cold crash it sucks in the CO2 from the balloon rather than just air.
     
  2. jollster101

    Well-Known Member

    Joined:
    20/4/13
    Messages:
    70
    Likes Received:
    9
    Posted 9/7/19
    Thanks.

    I recall (I think) that WEAL was collecting into a spare keg he had via some method or other. Bit sketchy on the memory hence the ask.
     
  3. wide eyed and legless

    Pro Pro

    Joined:
    5/9/13
    Messages:
    6,655
    Likes Received:
    3,042
    Gender:
    Male
    Location:
    Mulgrave Victoria
    Posted 9/7/19
    It is somewhere in this thread, as it isn't really anything to do with pressure fermenting I suppose a new thread could be created.
     
  4. MHB

    Well-Known Member

    Joined:
    30/9/05
    Messages:
    5,594
    Likes Received:
    3,006
    Gender:
    Male
    Location:
    Newcastle
    Posted 9/7/19
    I know some brewers are very money conscious (tight as a fishes....) but before you go rushing off and storing CO2 that you cant be sure is either pure or sterile.
    Every Mole of a gas occupies about 22.4L at STP (0.0oC & 1Bar), the number of moles can be found by dividing a mass by the Molecular Weight (MW) of the gas, for CO2 it about 44MU. I pay $10 a kg for CO2, so for that I get -
    1000g/44= 22.73Moles*22.4L/M=509L or enough to fill 25 of 20L kegs or 40cents per keg full.
    Lets just say at that price I would happily part with up to $1, just to be sure the gas I use ids both pure and sterile.
    I certainly would be investing a lot of time or effort in capturing CO2, or methane from farts either. Both strike me as a pretty problematic.
    Mark
     
    razz, JDW81 and damohb like this.
  5. HaveFun

    Well-Known Member

    Joined:
    26/9/09
    Messages:
    191
    Likes Received:
    24
    Gender:
    Male
    Occupation:
    Cheese Maker
    Location:
    Mount Gambier
    Posted 26/1/20
    Hi,

    I'm fermenting under pressure in my corny kegs. And I serve out of them.

    I brew mostly Bavarian wheat beer, they don't have to be crystal clear :)

    The advantage for me is that I only have to clean the keg.

    I adjusted the pressure to around 15psi. But the last time I forgot to adjust the pressure. And I ended up with a fully carbonated brew.

    What's the disadvantage if I don't adjust the pressure? The yeast seems fine with it.

    Cheers and happy brewing
    Stefan
     
  6. theSeekerr

    Well-Known Member

    Joined:
    8/9/16
    Messages:
    90
    Likes Received:
    30
    Posted 26/1/20
    Some yeasts don't like it. There's no question that that much pressure is a stressor.

    You can mostly get the best of both worlds by adjusting the pressure to your typical range (10-15 psi or whatever you use) for most of the ferment, then adjusting your PRV to ~30-35 psi for the last 4 points or so. That's enough to fully carbonate but minimises the amount of work the yeast do under stress.

    But if your favourite yeast doesn't seem to care, do whatever!
     
Draft saved Draft deleted

Share This Page

Group Builder