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Old 08-29-2012, 01:20 AM   #1
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Default Comfortable blab batch size in a 60 qt pot?

I am ready to move to all grain brewing and I would like to begin with biab. What would be a rule of thumb for a comfortable batch size as a percentage of the pot size? Would 50 percent be reasonable? So for a 60 qt pot, would a 7.5 gallon batch size be doable? I am sure the size of the grain bill would also be important.

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Old 08-29-2012, 01:32 AM   #2
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The rough rule is the pot should be double the batch size.
As for grain bill, a few extra pounds wont make a difference.
But your efficiency will drop a bit. Plus the larger grain bills are much heavier from the extra water.


15 gallon pot, 7.5 gallon batch is fine.
Most kits are 5 gallon, so you will have to design your own, and buy your own ingredients.


My suggestion is first try 5 gallon BIAB before moving up.

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Old 08-29-2012, 02:07 AM   #3
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When I bought my 62 qt Bayou Classic I did it with the intention of eventually brewing 10 gallon batches, which I read several people have done with that pot.

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Old 08-29-2012, 02:23 AM   #4
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Quote:
Originally Posted by Jackjama View Post
So for a 60 qt pot, would a 7.5 gallon batch size be doable? I am sure the size of the grain bill would also be important.
using the rackers calc "can I mash it"

http://www.rackers.org/calcs.shtml/

for a 7.5 gal batch w/ 18lbs of grain and 11.5 gal strike water (2.6 qt/lb), the resultant mash is 13.1 gallons....so yes It can be done w/ room to spare.

So, I guess the rule of thumb that I use; kettle should be double batch size is relevant. A ten gallon batch w/ the same pot is borderline depending on grainbill.

For a ten gallon batch w/ 20 lbs of grain and 13 gal strike water the resultant mash volume is 14.6 gallons, so the kettle is maxed out and should yield approx. 11 gallons of wort...not really enough for a true ten gallon batch IME. So NG...kettle is somewhat limited to double batch sparge, however w/ a dunk sparge to increase preboil volume, a ten gallon batch could possibly be done w/ a 15 gal kettle.
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Old 08-29-2012, 02:36 AM   #5
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Great information. I book marked the calculator. The five gallon first batch suggestion is also a good idea because it will fit me seven gallon fermenter. When i go to seven and a half gallon batches, my plan is to use two five gallon buckets. Does anybody see a problem going with two buckets for fermentation?

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Old 08-29-2012, 02:30 PM   #6
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Does anybody see a problem going with two buckets for fermentation?
nope...just two buckets to clean instead of one...but two smaller containers will dissipate the heat of fermentation better...
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Old 08-29-2012, 06:10 PM   #7
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I do BIAB in a 15 gallon blichman. 5 gallon batch I do single infusion and a really thin mash, no sparge. for a 10 gallon batch I do 1.5 Qt/Lb, drain the runings and do a sparge, then return all the runings to the brew kettle for the boil. Just need to drain the first runings into a fermenter to hold temporarailly while I heat the sparge water.

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Old 08-29-2012, 06:18 PM   #8
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using the rackers calc "can I mash it"

http://www.rackers.org/calcs.shtml/
I've thought about a BIAB setup. I'll have to check that out.
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Old 08-29-2012, 06:29 PM   #9
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Just need to drain the first runings into a fermenter to hold temporarailly while I heat the sparge water.
William, at the risk of being considered a nit-picking pain in the ass...I just respectfully don't like the idea of putting unsanitary first runnings in a fermenter...I know, I realize the fermenter will be sanitized prior to use as a fermenter...but best practice is not to mix (pre / post boil) or hot and cold side equipment. Sorry, just my peeve.

Spare bucket, pot, kettle, anything but the precious fermenter. cheers!
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Old 08-29-2012, 09:14 PM   #10
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>.For a ten gallon batch w/ 20 lbs of grain and 13 gal strike water the resultant mash volume is 14.6 gallons, so the kettle is maxed out and should yield approx. 11 gallons of wort...not really enough for a true ten gallon batch IME. So NG.

I think a 15 gallon pot can easily handle a 20 lb 10 gallon BIAB batch.
You can mash at around 2 Q/lb. So thats 40Q (10G) + the volume of the grain (less than 2 gallons).
Say you lose 2 gallons, leaving 8G.
Because BIAB may lose efficiency for higher gravities or larger grain bills, you can sparge with 3 gallons, putting you at 11.
[Just watch out for boil over]

From Boil off and kettle loss you will end up with 9.5G ...
and
...
you can add in a gallon of chilled water at the end - it will help get you to pitching temperature - and stir it in well.
You end up with two 5.25 G buckets worth of wort.

No harm in adding a gallon at the end, especially since it helps you lower the 10.5G batch a few more degrees.

I think it would be wasteful to not take advantage of your 15G kettle for 10 gallon batches.
A 20G kettle would be an unnecessary additional piece of equipment to buy.
Also, 20G Blichmann Boilermakers are not really well suited to 5G batches. The thermometer is situated way too high. (though of course it can be used that way).

I think a lot of people use 15 gallon kettles for 10 gallon batches. The only real risk is the extra chance of a boilover.

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