General Category > Kegging and Bottling

Bottling From Keg Carbonation/Temperature

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patrickswayze:
So my question is in regards to temperature and carbonation and their role on bottled beer from a keg. So say if you bottle your beer from your keg at 45'F as an example. You you have purged the bottle of oxygen as well as the head space once the bottle is filled. Assuming that your beer is done fermenting, fully carbonated and had reached equilibrium in the keg, will your carbonation change as the temp of the beer in the bottle changes? What i am getting at is would the beer foam over if you opened say at 70'F leaving your beer slightly flat since i would think the beer could hold less co2. Maybe i am over thinking it but since i cannot control the temp in which people drink my beer at, the last thing i want is a foamy bottle of beer. If i open commercial beer warm, it doesn't foam over and is still carbonated. How does this work, someone please enlighten me. Thanks

P.S. I am new to kegging if you haven't noticed

tygo:
The level of carbonation won't change in the bottle once it's bottled and capped, presuming it's fully finished fermenting.

However, you probably will lose some amount of carbonation going from the keg to the bottles, so having the beer carbed slightly higher than your desired serving volume in the keg, before transferring, is probably a good idea.

jmcamerlengo:

--- Quote from: tygo on July 17, 2012, 05:17:39 pm ---The level of carbonation won't change in the bottle once it's bottled and capped, presuming it's fully finished fermenting.

However, you probably will lose some amount of carbonation going from the keg to the bottles, so having the beer carbed slightly higher than your desired serving volume in the keg, before transferring, is probably a good idea.

--- End quote ---

With no real way of measuring other than my own taste buds, when bottling from a BeerGun, that I lose approximately .2 volumes of CO2 on the transfer. So if I want 2.5 volumes in a bottle I carbonate to 2.7 volumes in the keg. This is of course trivial and probably not "true" but it seems to be a good working rule of thumb for me.

Joe Sr.:
The last bottle I opened that was filled from a keg was under-carbonated.  The keg was over-carbonated, so I was not expecting this problem.

I still have some work to do on perfecting this...

Make sure your bottles are cold when you bottle.  If they are warm, you will lose much more carbonation before you get the bottles capped.

euge:
Chill that beer down to near freezing. This will save you some carbonation loss. Are you using a counter-pressure filler? You shouldn't lose much if at all.