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Old 03-15-2013, 03:32 PM   #1
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Default Keggle question

Is it possible to brew 15 gallon batches in a 15.5 gallon keggle set up?

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Old 03-15-2013, 03:34 PM   #2
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Pretty sure 12 gal is about the limit, the place you are going to run into limitations will be the boil kettle (unless you ferment in a keg as well). Even at 12 gallons you are probably only yielding 11 finished.

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Old 03-15-2013, 03:46 PM   #3
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I was asked this and didnt have a definite answer but I thought for a 15 gallon batch you would need at least 17.5 gallon of water which that alone would make the 15.5 keggle useless for a batch of 15 gallons ..

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Old 03-15-2013, 03:51 PM   #4
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I was asked this and didnt have a definite answer but I thought for a 15 gallon batch you would need at least 17.5 gallon of water which that alone would make the 15.5 keggle useless for a batch of 15 gallons ..
Well, you can start with 12 gallons for the boil, and end up with 10.5 finished gallons. Some people would then add some water (and/or DME) to get up to 15 gallons. I have never done that, but I'm sure it's possible.
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Old 03-15-2013, 03:56 PM   #5
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Well, you can start with 12 gallons for the boil, and end up with 10.5 finished gallons. Some people would then add some water (and/or DME) to get up to 15 gallons. I have never done that, but I'm sure it's possible.
It works for that big brewer in St Louis.
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Old 03-15-2013, 03:59 PM   #6
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It works for that big brewer in St Louis.
Sure. But at a homebrewing level, you'd have to keep in mind that the hops utilization would be different than boiling all of the wort together. Of course, in low hopped beers that wouldn't be an issue but it might be very hard to do a great IIPA with dilution.
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Old 03-15-2013, 04:05 PM   #7
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I giggled when I initially read this, because I knew it would create controversy over how vigorously you boil and such. But then I got to thinking "Is there a cut and dry answer?" Yes, there is.

Ignoring all else, the expansion rate of water when heated to boiling is approximately 4%
15.0 * 1.04 = 15.6 gallons

So the only possible way to pull this feat off would be to top off with water after the fact ;-)

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Old 03-15-2013, 04:10 PM   #8
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I giggled when I initially read this, because I knew it would create controversy over how vigorously you boil and such. But then I got to thinking "Is there a cut and dry answer?" Yes, there is.

Ignoring all else, the expansion rate of water when heated to boiling is approximately 4%
15.0 * 1.04 = 15.6 gallons

So the only possible way to pull this feat off would be to top off with water after the fact ;-)
I prefer to divide by 0.96 instead of multiply by 1.04. How's that for controversy!
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Old 03-15-2013, 04:30 PM   #9
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I do 90 min boils, loosing 2 gallons from my batches (regardless of batch size obviously). So to do a 15 gallon batch, and leave room for boiling, the most wort you could have in the kettle "safely" would be 14ish gallons. In my case I would still end up with 12 gallons and have to add 3 gallons at the end.

In order to plan for this in regards to the adjustment to the IBUs (which would be lower since you are adding more water) you would run the entire recipe in your calculator as a 15 gallon recipe, then calculate your mash schedule for a 12 gallon batch. The final step then is to top off with 3 gallons of santized water.

It isn't perfect, and your gravities will be off some, but it will get you 15 gallons.

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Old 03-15-2013, 04:40 PM   #10
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You could always add a little water throughout the boil to keep it at 14-14.5 gallons (a pint here a pint there). Then just add the last little bit to hit 15 gallons at the end.

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