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Home Brew Forums > Home Brewing Beer > Bottling/Kegging > Can I ferment 15 gallons in a 15.5 gallon keg?
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Old 10-21-2011, 11:08 PM   #1
DlALTONE
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Default Can I ferment 15 gallons in a 15.5 gallon keg?

I am worried I will not have enough head space for the fermentation. I plan on taking the keg's stem out and putting a rubber carboy cap on w airlock.

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Old 10-21-2011, 11:17 PM   #2
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Instead of an airlock you could use a large blow off tube

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Old 10-21-2011, 11:20 PM   #3
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I am worried about losing alot of brew. Ill be mostly doing stouts. I will be doing 15 gallon batches and want to use a 1/2 barrel so I can transfer using CO2. I thought about using that anti foam but am worried that it may effect my head retention or that it will not be effective enough with only 1/2 gallon head space.

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Old 10-22-2011, 12:04 AM   #4
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I don't use anti foam, but read this as it will correct a lot of the mis information about the stuff.

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Old 10-22-2011, 12:12 AM   #5
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Quote:
Originally Posted by samc View Post
I don't use anti foam, but read this as it will correct a lot of the mis information about the stuff.
Great find there...

Still 15 gallons into a 15.5 gallon keg is mighty tight. I would put about 11-12 gallons into it, and use another vessel for the rest. Such as a 1/6 bbl sanke keg. Or just reduce your batch size by a gallon, or two, and give yourself enough headspace to not need to worry.
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Old 10-23-2011, 08:40 PM   #6
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I would go with a blow off tube and expect to lose some brew.

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Old 10-25-2011, 03:49 AM   #7
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I've had trouble with a hyperactive fermentation of 12 gallons in a 14.5 gallon conical. I ended up losing nearly a gallon. I think that 15 gallons in a 15.5 gallon fermenter is way too much. If you have a carboy, ferment 3 or 4 gallons in it and the rest in the keg.

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Old 10-25-2011, 03:53 AM   #8
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do a closed off sealed fermentation in that keg. it should be able to ferment 15 gallons under pressure JUST FINE.

-=Jason=-

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