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Old 12-07-2013, 04:02 AM   #11
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Originally Posted by WaltG View Post
Don't worry about tannins if you squeeze out the bag?
No that's a myth. It's impossible for person to squeeze tannins out of the grain. If you have a smaller pot by squeezing the bag will let you get more out of your mash since your not losing as much to absorption.


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Old 12-08-2013, 03:00 AM   #12
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Default How much space does grain take up?

So I have a 32qt pot with a 13lb grain bill for a 5.5gal brew. Needless to say it's going to be a tight fit. How much water per LB does grain displace.



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Old 12-08-2013, 04:50 AM   #13
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These should help...

http://www.homebrewtalk.com/f11/how-big-your-mash-tun-needs-123585/

http://www.homebrewtalk.com/f36/mlt-size-spreadsheet-can-i-mash-what-tun-should-i-get-443654/

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Old 12-08-2013, 06:06 AM   #14
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Originally Posted by 1MadScientist
As a matter of interest, 13.5 pounds would produce a 1.065 OG with 9 gallons of water (2.75 qt/lb ratio).
13.5 pounds of DME maybe. Certainly not grains, unless you boiled that down to 6 gallons.
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Old 12-08-2013, 08:30 AM   #15
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Originally Posted by WaltG View Post
So I have a 32qt pot with a 13lb grain bill for a 5.5gal brew. Needless to say it's going to be a tight fit. How much water per LB does grain displace.
You don't have to use the full amount of water for the mash. Use as much as you can. Top up when you start the boil. Efficiency might take a little hit but grain is cheap, big pots are expensive.
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Old 12-08-2013, 02:39 PM   #16
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I use the spreadsheet below and it has been very accurate since I dialed it in. My absorption is set down to .05 but I squeeze the bag. Use as much water as you can then dunk the bag in whatever remaining water you need to hit your volume.

BIAB Spreadsheet

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Old 12-08-2013, 02:50 PM   #17
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Quote:
Originally Posted by TimelessCynic

13.5 pounds of DME maybe. Certainly not grains, unless you boiled that down to 6 gallons.
You wouldn't boil 9g down to 6g.. 9g is the starting volume and there is going to be absorption during the mash. You might have 7 or so after mashing to boil down. I easily get 1.065 with 13ish pounds of grain with around 8 1/2 to 9 gallons full volume mashing.
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Old 12-08-2013, 04:42 PM   #18
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Quote:
Originally Posted by TBaGZ
You wouldn't boil 9g down to 6g.. 9g is the starting volume and there is going to be absorption during the mash. You might have 7 or so after mashing to boil down. I easily get 1.065 with 13ish pounds of grain with around 8 1/2 to 9 gallons full volume mashing.
Are my calculations wrong? Just say grain gives 36 points per pound per gallon.

You have 13.5 pounds times 36 points divide that by 9 gallons and you get 54 points so 1.054 gravity. And that is at 100% mash efficiency.

Or are you guys talking about the post boil gravity of a 5.5 gal wort. In which case yes 13.5 lbs of grain is plenty to achieve 1.065
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Old 12-09-2013, 12:50 AM   #19
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Yes, post boil.

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Old 12-10-2013, 01:59 PM   #20
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I achieved 87% efficiency on my last BIAB brew using re-circulation and stirring during the mash with a 3:1 grain to water ratio. That's 10% better than what I achieved with batch sparging. You'll have to try your system and see what it gives you, then use that percent efficiency for your next brew calculations.

Tannin extraction occurs when pH increases above the ideal mash range (5.2-5.6). This is often a problem during batch sparging as the wort is diluted by circumneutral pH sparge water, causing the pH to increase unless the sparge water is pre-acidified.

Assuming that your BIAB mash pH is in the ideal range at the beginning of your mash (if not, add acid), then it should remain stable regardless of whether you squeeze your grains, and tannin extraction is a non-issue. Mechanically disrupting the grains (i.e. squeezing) is not going to extract any more water soluble molecules (i.e. tannins or sugars) than would one hour of soaking in ~150 degree water. I love how BIAB greatly simplifies mash chemistry!



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