Author Topic: ultrafast forced carbonation  (Read 1033 times)

Offline homoeccentricus

  • Brewmaster General
  • *******
  • Posts: 2008
  • A twerp from Antwerp
    • View Profile
ultrafast forced carbonation
« on: January 22, 2016, 03:05:31 PM »
Silly question of the week.

Is it possible to force-carbonate a porter within half an hour or so and be able to pour a decent glass?
I'm currently abroad and need to prolong my stay until Wednesday. On Thursday there's an introduction into kegging in our new homebrew club. I was planning to slow-carbonate the porter by then, but that's now impossible. I understand it can be done within 24 hours, but can it also be done within 30 minutes, so that people can observe the process?
Frank P.

Staggering on the shoulders of giant dwarfs.

Offline homoeccentricus

  • Brewmaster General
  • *******
  • Posts: 2008
  • A twerp from Antwerp
    • View Profile
Re: ultrafast forced carbonation
« Reply #1 on: January 22, 2016, 03:06:41 PM »
Ah yes, no beer should be harmed in the process. I.e. this should be reversible when things go wrong.
Frank P.

Staggering on the shoulders of giant dwarfs.

Offline erockrph

  • Official Poobah of No Life.
  • *
  • Posts: 6185
  • Chepachet, RI
    • View Profile
    • The Hop WHisperer
Re: ultrafast forced carbonation
« Reply #2 on: January 22, 2016, 04:11:56 PM »
Do you have access to a paint shaker? If the beer is ice-cold and you have the keg upside down (or hook up the gas to the out post so it bubbles up through the beer), then you might be able to do it at safe PSI's (or kPa if that's your thing over there) under constant agitation. But that's just a guess. No clue what pressure you would need to be on target at half an hour.
Eric B.

Finally got around to starting a homebrewing blog: The Hop Whisperer

Offline jeffy

  • Official Poobah of No Life.
  • *
  • Posts: 3387
  • Tampa, Fl
    • View Profile
Re: ultrafast forced carbonation
« Reply #3 on: January 22, 2016, 04:16:15 PM »
Yes, it can be done.  Have the keg cold, turn up the pressure to 30 psi and shake the keg for a minute.  Relieve the pressure both on the keg and on the regulator and turn on the gas again, turn up the pressure until you start to hear gas bubbling in -that will be the current carbonation/saturation level.  You are trying for about 10 psi.
The first couple of pints will probably be foamy.
Jeff Gladish, Tampa (989.3, 175.1 Apparent Rennarian)
Homebrewing since 1990
AHA member since 1991, now a lifetime member
BJCP judge since 1995

Offline brewinhard

  • Official Poobah of No Life.
  • *
  • Posts: 3217
    • View Profile
Re: ultrafast forced carbonation
« Reply #4 on: January 22, 2016, 06:07:37 PM »
Yes, it can be done.  Have the keg cold, turn up the pressure to 30 psi and shake the keg for a minute.  Relieve the pressure both on the keg and on the regulator and turn on the gas again, turn up the pressure until you start to hear gas bubbling in -that will be the current carbonation/saturation level.  You are trying for about 10 psi.
The first couple of pints will probably be foamy.

You will need to shake the keg longer than 1 minute.  Try at least 5 for starters.

Offline tommymorris

  • Senior Brewmaster
  • ******
  • Posts: 1953
  • Tommy M.
    • View Profile
Re: ultrafast forced carbonation
« Reply #5 on: January 22, 2016, 09:11:27 PM »
I do a lot of demos for work. It is always good to practice before giving your demo to an audience.

Offline HoosierBrew

  • Global Moderator
  • I must live here
  • *****
  • Posts: 13030
  • Indianapolis,IN
    • View Profile
Re: ultrafast forced carbonation
« Reply #6 on: January 22, 2016, 09:25:01 PM »
Yes, it can be done.  Have the keg cold, turn up the pressure to 30 psi and shake the keg for a minute.  Relieve the pressure both on the keg and on the regulator and turn on the gas again, turn up the pressure until you start to hear gas bubbling in -that will be the current carbonation/saturation level.  You are trying for about 10 psi.
The first couple of pints will probably be foamy.

You will need to shake the keg longer than 1 minute.  Try at least 5 for starters.


Yeah, I've never been able to pour that soon after shaking without mostly foam.
Jon H.

Offline homoeccentricus

  • Brewmaster General
  • *******
  • Posts: 2008
  • A twerp from Antwerp
    • View Profile
Re: ultrafast forced carbonation
« Reply #7 on: January 23, 2016, 10:35:12 AM »
I'm not afraid of goofing up in public, but there's no point risking seriously foamy beer, so I'll force-carbonate 1 day in advance.  So please a 24 hour force-carbonation method with the added complication that the keg contains only 12 liters? Much obliged!
Frank P.

Staggering on the shoulders of giant dwarfs.

Offline norcaljp

  • Assistant Brewer
  • ***
  • Posts: 123
  • I prefer to drink my bread, thank you
    • View Profile
    • The Brewins
Re: ultrafast forced carbonation
« Reply #8 on: January 23, 2016, 06:10:01 PM »
No need to change the method described above, the extra time will let the beer settle. I think of it like shaking up a bottle of soda. If you open it right away, it foams like crazy, but if you let it settle it won't foam when opened.

The real trick here is not to over carbonate. I agree that it will take more than a minute, however I like Jeffy's method and just repeat as necessary. It's easy to over-carbonate a beer when agitating with 30 PSI. I think that will allow you to better know when to stop.
Joel Prater

I prefer to drink my bread, thank you

Offline brewinhard

  • Official Poobah of No Life.
  • *
  • Posts: 3217
    • View Profile
Re: ultrafast forced carbonation
« Reply #9 on: January 23, 2016, 09:09:31 PM »
I'm not afraid of goofing up in public, but there's no point risking seriously foamy beer, so I'll force-carbonate 1 day in advance.  So please a 24 hour force-carbonation method with the added complication that the keg contains only 12 liters? Much obliged!

Is this amount in a smaller keg or regular 5 gal corny?


Offline homoeccentricus

  • Brewmaster General
  • *******
  • Posts: 2008
  • A twerp from Antwerp
    • View Profile
Re: ultrafast forced carbonation
« Reply #10 on: January 23, 2016, 09:13:44 PM »
I'm not afraid of goofing up in public, but there's no point risking seriously foamy beer, so I'll force-carbonate 1 day in advance.  So please a 24 hour force-carbonation method with the added complication that the keg contains only 12 liters? Much obliged!

Is this amount in a smaller keg or regular 5 gal corny?

5 gallon.
Frank P.

Staggering on the shoulders of giant dwarfs.

Offline homoeccentricus

  • Brewmaster General
  • *******
  • Posts: 2008
  • A twerp from Antwerp
    • View Profile
Re: ultrafast forced carbonation
« Reply #11 on: January 24, 2016, 12:56:23 PM »
One more question: is yeast lying on the bottom of the fermenter active? If so, in what way? If not, why can't it be removed during fermentation?
Frank P.

Staggering on the shoulders of giant dwarfs.