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Old 05-12-2011, 05:32 PM   #121
Kaz
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I just racked a BIAB All grain batch of pale ale to keg last night, using nothing but Irish Moss in the boil, no crash cooling or anything and it looked as clear as any other brew I've done. I'm betting a couple of weeks in the fridge at 38F and it will be crystal clear.


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Old 05-13-2011, 03:58 PM   #122
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So, I'm getting ready to try the AG BIAB method soon, and I'm trying figure out my water volume needed, but my head is starting to spin and just need some clarification.

I only have a 32 qt (8 gal) kettle, and I'm wanting to brew a IIPA that calls for ~13-14 lbs of grains, so I don't think I'll have enough volume to do a no sparge method. I have another stock pot that is approximately 3.5 gallons, so that should work for the access water/sparge dunk needed.

Here's the question.

If I want to finish with approximately 4.5 gallons....does this look correct?
4.5 + 1.5 (90 minute boil off) + 1.4 absorption (14*.1) + .25 trub = 7.65 total water needed.
obviously, I can't put 7.65 gallons of water in my 8 gallon kettle and expect 14 lbs of grains to fit, so I need to remove about 2 to 2.5 gallons of water and use it as a sparge dunk.

Does this sound right?


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Old 05-13-2011, 04:14 PM   #123
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Quote:
Originally Posted by Philip_T View Post
So, I'm getting ready to try the AG BIAB method soon, and I'm trying figure out my water volume needed, but my head is starting to spin and just need some clarification.

I only have a 32 qt (8 gal) kettle, and I'm wanting to brew a IIPA that calls for ~13-14 lbs of grains, so I don't think I'll have enough volume to do a no sparge method. I have another stock pot that is approximately 3.5 gallons, so that should work for the access water/sparge dunk needed.

Here's the question.

If I want to finish with approximately 4.5 gallons....does this look correct?
4.5 + 1.5 (90 minute boil off) + 1.4 absorption (14*.1) + .25 trub = 7.65 total water needed.
obviously, I can't put 7.65 gallons of water in my 8 gallon kettle and expect 14 lbs of grains to fit, so I need to remove about 2 to 2.5 gallons of water and use it as a sparge dunk.

Does this sound right?
Check out "Can I mash it" at http://www.rackers.org/calcs.shtml. 5 gallons (7.65 total - 2.65 for sparge) = 20 qts. 20qts/14lbs = 1.43 qts/lb. Plug that in with your 14lb grain bill and you get a hair over 6 gallons of needed mash tun volume. You should be all set, at least in theory. Boiling 7+ gallons in an 8 gallon pot is a whole different story.
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Old 05-13-2011, 04:25 PM   #124
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Quote:
Originally Posted by Philip_T View Post
So, I'm getting ready to try the AG BIAB method soon, and I'm trying figure out my water volume needed, but my head is starting to spin and just need some clarification.

I only have a 32 qt (8 gal) kettle, and I'm wanting to brew a IIPA that calls for ~13-14 lbs of grains, so I don't think I'll have enough volume to do a no sparge method. I have another stock pot that is approximately 3.5 gallons, so that should work for the access water/sparge dunk needed.

Here's the question.

If I want to finish with approximately 4.5 gallons....does this look correct?
4.5 + 1.5 (90 minute boil off) + 1.4 absorption (14*.1) + .25 trub = 7.65 total water needed.
obviously, I can't put 7.65 gallons of water in my 8 gallon kettle and expect 14 lbs of grains to fit, so I need to remove about 2 to 2.5 gallons of water and use it as a sparge dunk.

Does this sound right?
that'll work
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Old 05-13-2011, 04:27 PM   #125
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Quote:
Originally Posted by wrench View Post
Check out "Can I mash it" at http://www.rackers.org/calcs.shtml. 5 gallons (7.65 total - 2.65 for sparge) = 20 qts. 20qts/14lbs = 1.43 qts/lb. Plug that in with your 14lb grain bill and you get a hair over 6 gallons of needed mash tun volume. You should be all set, at least in theory. Boiling 7+ gallons in an 8 gallon pot is a whole different story.
Thanks wrench. I've never tried to boil that much volume in my kettle, but at least it will be with a turkey fryer and not on the stove top.
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Old 05-13-2011, 04:31 PM   #126
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Originally Posted by Mysticmead View Post
that'll work
Thanks Mystic.....looks like all systems are go for next weekend!
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Old 05-13-2011, 04:49 PM   #127
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Try this spreadsheet I put together to save me trouble. (Math is hard...)

Here's the formula I used:

=SUM(C1+(C2*C3)+(C4*C5)+C6+C7-C8)

C1=desired finish volume (gallons)
C2=grain weight (pounds)
C3=grain absorption (gallon/pound)
C4=boil-off rate (gallon/hour)
C5=boil time (hours)
C6=kettle loss (gallons)
C7=fermenter loss (gallons)
C8=starter size (gallons)
SUM=total water volume needed (gallons)


Edit: can't do attachments.
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Old 05-13-2011, 04:56 PM   #128
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you won't be boiling 7+ gallons.. once you subtract the absorption amount you're in the 6 gallon range. that's doable in an 8 gallon brew pot you just have to be ready to cut the heat to avoid a boil over.. or better yet, keep a spray bottle of cold water handy to spray the foam..
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Old 05-13-2011, 05:32 PM   #129
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Quote:
Originally Posted by Mysticmead View Post
you won't be boiling 7+ gallons.. once you subtract the absorption amount you're in the 6 gallon range. that's doable in an 8 gallon brew pot you just have to be ready to cut the heat to avoid a boil over.. or better yet, keep a spray bottle of cold water handy to spray the foam..
That makes sense. Say I start with 5 gallons for mashing and 2.65 for sparge. I will lose 1.4 gallons from the 5 to leave me with 3.6...then add the 2.65 for 6.25. Actually, will probably be a little under that with some additional absorption of the sparge water. Say 6 gallons to boil for 90 minutes with 1.5 gal boil off = 4.5 gallons.

Thanks for the formula thughes, I'll plug that into excel for future use.
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Old 05-13-2011, 05:55 PM   #130
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the grain isn't going to absorb much (if any) more with the sparge.. but you're on the right track.


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