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Old 10-02-2012, 02:02 AM   #11
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Actually, now that I have had some time to think about it, don't use an airlock in the freezer. I think it will freeze.

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Old 10-02-2012, 03:14 AM   #12
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Quote:
Originally Posted by DeafSmith View Post
I don't have any good ideas about what to do with your present situation, but I am curious if you had your blow-off container elevated when this mishap occurred? It seems to me it would be unlikely or impossible to suck 1/2 gallon back into the fermenter if the blow-off container is on the same level as the fermenter. On the other hand, if the blow-off container is elevated, then it would only take a small amount of suck-back to start a siphon from the blow off container back into the fermenter, causing the blow-off to all be dumped back into the fermenter.
not with the right temperature differential.
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Old 10-02-2012, 04:00 AM   #13
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not with the right temperature differential.
Yeah, I was only thinking about beer and gas shrinkage due to temperature, but I think the largest factor is the absorption of gas as the beer cooled and I can believe that could account for 1/2 gallon or more of "shrinkage".
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Old 10-02-2012, 11:40 AM   #14
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Also depends on headspace. While the liquid will contract slightly, the gas accounts for most of the pressure drop. A fermenter filled close to the top will have a lower pressure drop than a fermenter only half full. Also depends on temperature drop. If it was warm going into the freezer, there would be a bigger disparity between initial and final pressure.

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Old 10-02-2012, 03:50 PM   #15
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But assuming that it was at fermentation temp, say mid-60's at the beginning, and cooled by about 30º F when crash cooled, then the beer should only shrink about 1% and the gas only about 6% (PV=nRT). So for a 5 gallon batch with a one gallon headspace, that only amounts to .05 + .06 gallon = .11 gallon, or less than 1/2 quart. I have to believe that gas absorption at the colder temp. is the biggest factor. The only way I can think of to analyze this is by looking at a force carbonation chart like this one:

http://www.kegerators.com/carbonation-table.php

There is no zero pressure column in the chart, so use the 1 PSI column. Volumes at 65º F = 0.88 and at 34º F = 1.68, a difference of 0.8 volumes, or, for 5 gallons, 4 gallons of gas. Now obviously all of that would not be absorbed in a couple of days of crash cooling, but still indicates that it may be the biggest factor in the "shrinkage".

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Old 10-03-2012, 01:55 PM   #16
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There was at most 1 gallon of head space, maybe less. It was a very full fermenter. The other fermenter had about a gallon more head space and didn't have the problem.

I ended up racking from the bottom into a keg and have it under pressure as we speak. It smelled great in the keg and well see how it turns out in few weeks. I'll probably end up bottling it with the beer gun later on.

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Old 10-03-2012, 02:00 PM   #17
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As luck would have it, this will likely be the best beer you ever had. Good luck trying to replicate in the future

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Old 10-03-2012, 02:04 PM   #18
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I ran into this last year.
Sucked in a 1/2 quart of a lightly dosed Iodophor solution. Live and learn I guess.
Mine was barely drinkable, it doesn't take much Iodine to ruin a batch, very strong aftertaste.
I switched to starsan soon after, I prefer the taste of Starsan to Iodophor

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Old 10-03-2012, 02:07 PM   #19
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Quote:
Originally Posted by mredge73
I ran into this last year.
Sucked in a 1/2 quart of a lightly dosed Iodophor solution. Live and learn I guess.
Mine was barely drinkable, it doesn't take much Iodine to ruin a batch, very strong aftertaste.
I switched to starsan soon after, I prefer the taste of Starsan to Iodophor
You say it was undrinkable (which is certainly believable). Do you remember if it mixed? OP was able to siphon from under the layer of sterile solution.

I'm imagining a giant Black and Tan...
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Old 10-03-2012, 03:05 PM   #20
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Now imagine drinking that much black & tan...

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