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Offlineinvitro


Registered: 05/03/13
Posts: 2,529
Last seen: 1 month, 21 days
How psi affects fermentation
    #23505984 - 08/03/16 02:37 PM (7 years, 5 months ago)

My question is, if I'm fermenting in a closed vessel and the pressure rises  5psi? 10 psi? How is this affecting
the fermentation process?

I don't recall where I read this but in industrial brewing vessels the internal pressure is 1.5 x atmospheric
pressure, and this is beneficial to the brewing process, I think speeds it up if I recall.

I'm thinking more along the lines of fermenting vegetables right now, but perhaps beer later.

If I had a carboy with an airlock, I wonder what volume of water would you have to use in order to
achieve 1.5 psi internally.


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Invisibletito123
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Registered: 01/23/10
Posts: 3,006
Re: How psi affects fermentation [Re: invitro]
    #23506198 - 08/03/16 03:41 PM (7 years, 5 months ago)

Quote:

My question is, if I'm fermenting in a closed vessel and the pressure rises  5psi? 10 psi? How is this affecting
the fermentation process?




If the gas being emitted is CO2, the liquid will absorb some and become a little carbonated.

Quote:

If I had a carboy with an airlock, I wonder what volume of water would you have to use in order to
achieve 1.5 psi internally.




I'm not sure about that.  I don't think the psi is really something to worry about imo, although I've only fermented veggies, milk kefir, and some wine so I'm not an expert on beer.


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Offlineinvitro


Registered: 05/03/13
Posts: 2,529
Last seen: 1 month, 21 days
Re: How psi affects fermentation [Re: tito123]
    #23506340 - 08/03/16 04:28 PM (7 years, 5 months ago)

What prompted me to ask is... when I open a jar of fermenting veggies, the air pressure equalizes and a bunch
of bubbles come out of solution.  I just wonder if the water gets saturated with co2 and stalls the fermentation
process. ?


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Invisibletito123
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Registered: 01/23/10
Posts: 3,006
Re: How psi affects fermentation [Re: invitro]
    #23507578 - 08/03/16 09:35 PM (7 years, 5 months ago)

I'm not an expert, but again, I wouldn't worry about it. It's good to burp the jars so that co2 doesn't build up, but I don't know of any other advantage.

If you haven't read it already, I'd recommend the book "The Art of Fermentation" by Sandor Katz.  Just have fun with it.


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Offlinefalcon
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Registered: 04/01/02
Posts: 8,005
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Re: How psi affects fermentation [Re: invitro]
    #23532757 - 08/11/16 08:20 PM (7 years, 5 months ago)

Get a fermentation lock and rubber grommet, the air lock releases any excess gas that occurs during fermentation, the grommet is put into a hole drilled into the lid of your vessel so when you use the airlock you have a good seal. You can get them at brewery stores, either walk in or internet. There's other ways to form a seal that lets air out but IMO this is the best way to do it.


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OfflinegeokillsA
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Registered: 05/08/01
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Re: How psi affects fermentation [Re: invitro]
    #23571661 - 08/24/16 03:02 AM (7 years, 5 months ago)

I would not expect any reasonable amount of pressure to stall fermentation, although I would be very careful and strongly advocate not fermenting in a sealed vessel as it could explode if the pressure exceeds the container's capacity to hold it.


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