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Home Brew Forums > Home Brewing Beer > Bottling/Kegging > Filled keg only half full, will it carb twice as fast?




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Old 03-14-2013, 07:40 PM   #1
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Default Filled keg only half full, will it carb twice as fast?

Forgive the silly question.. But say I usually put 5 gallons in my keg and it takes 4 days to carb at 25psi. If I only put in 2 gallons of the same beer with the same psi, will it take less time to carbonate?



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Old 03-14-2013, 07:58 PM   #2
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No,I prefer the tried and true 2-3 weeks at serving pressure, burst carbing is always hit or miss in my opinion. A liquid absorbs Co2 at a rate determined by temp and pressure.



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Old 03-15-2013, 12:09 AM   #3
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It's absorbing from the interface, so the diffusion front will reach the bottom of the keg more quickly if the keg is less full. In your particular instance however, with the 25psi, once the beer is pouring with the correct CO2 concentration, it will become overcarbonated over time, even if you turn the pressure down once the correct concentration is reached. If you want to ensure a faster carbonation with the correct CO2 level, my best advice is to agitate the keg while the pressure is set to the correct level for the temp of the beer.

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Old 03-15-2013, 12:29 AM   #4
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The answer to the question is: Yes.

Cheers!

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Old 03-15-2013, 01:52 AM   #5
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it will become overcarbonated over time, even if you turn the pressure down once the correct concentration is reached.
I don't understand this. Couldn't I just vent the keg and lower the pressure?
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Old 03-15-2013, 02:09 AM   #6
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Don't worry about it, that wasn't correct to begin with.

If you determined the beer had reached a proper carbonation level and turned down the regulator from the "burst carb" pressure (in this case, 25 psi) to the appropriate pressure vs beer temperature to maintain that carbonation level (refer to this chart), it would not over-carbonate...

Cheers!

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Old 03-15-2013, 04:45 AM   #7
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thank you!

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Old 03-15-2013, 09:01 AM   #8
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Quote:
Originally Posted by day_trippr View Post
Don't worry about it, that wasn't correct to begin with.

If you determined the beer had reached a proper carbonation level and turned down the regulator from the "burst carb" pressure (in this case, 25 psi) to the appropriate pressure vs beer temperature to maintain that carbonation level (refer to this chart), it would not over-carbonate...

Cheers!
It would. Once the carbonation was correct at the bottom, all the beer throughout the rest of the keg would have more than the correct amount. After some time, the beer would approach having a CO2 level in between that of the top and bottom. This average would be higher than the bottom, and thus too carbonated. Simple application of Fick's Law of Diffusion.
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Old 03-15-2013, 03:29 PM   #9
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Quote:
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It would. Once the carbonation was correct at the bottom, all the beer throughout the rest of the keg would have more than the correct amount. After some time, the beer would approach having a CO2 level in between that of the top and bottom. This average would be higher than the bottom, and thus too carbonated. Simple application of Fick's Law of Diffusion.
This would be the case regardless of how much beer is in the keg, no?
Although, I usually end my force carbing at 25 psi a couple days before it would actually hit the correct carbonation anyway.
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Old 03-15-2013, 03:37 PM   #10
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It's all about surface area. Lay the half full keg on its side and it'll carb faster.

For any given pressure and temperature, this is the best way to carb faster.
Just be sure you've purged the O2.



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