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Old 01-30-2012, 04:07 AM   #1
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Default Mash absorption

Is there a formula or rate that grains absorb initial strike water?


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Old 01-30-2012, 04:19 AM   #2
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I would start with an absorbtion rate of .15 gallons/pound of grain to begin with. It all depends on your system and how you're crushing your grain though. .15 is average.


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Old 02-08-2012, 08:32 PM   #3
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I have a total capacity of 5.5 gallon. I assume that if I start with 4-5 gallons strike water and add my 12 lbs of grain slowly while stirring them in, will I exceed my pot capacity?

My last batch I used an initial 3-4 gallons, and then sparged about 2 gallons for total of 5 gallons. This was a BIAB. I then also added 1 gallon to fermenter. Would this wash out my efficiency or ABV. Or am I better off just making 5 gallon batches until I can get a bigger pot?
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Old 02-08-2012, 09:49 PM   #4
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http://www.rackers.org/calcs.shtml

If you are doing BIAB, squeeze the bag to get better efficiency and less grain absorption. I've seen .33 QUARTS/lb used as an estimate of absorption that couldn't be squeezed out. YMMV.
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Old 02-09-2012, 01:59 AM   #5
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when it states in your calculator link that 12 lbs grain will take at 1.25 thickness 4.71 gallons of space.....that is total? Sorry if I'm asking a not so smart question.
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Old 02-09-2012, 02:46 AM   #6
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Yep. Used this calculator last week for my first AG and it worked like a charm. For your 12lbs of grain, qts/lb of 1.25(average), TOTAL space used is 4.74gal making a 20qt(5gal) mash kettle/vessel ideal(minimal headspace equals better temp retention during mash)

Oh, seek out Deathbrewer's stickies for BIAB/AG BIAB in the Beginner section.

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Old 02-09-2012, 03:01 AM   #7
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Old 02-09-2012, 03:08 AM   #8
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Will depend on grain weight if you BIAB. Since I almost never go over 5 lbs nor less than 3.5 lbs my loss seems to be only 0.0625 gallons/lb. With that small amount of grain I can really press most of the water out after the mash. I set up a spread sheet and kept track for 5 or 6 brews.


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