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Home Brew Forums > Home Brewing Beer > All Grain & Partial Mash Brewing > Batch Sparge Volume Question
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Old 01-18-2009, 04:12 PM   #1
Eskimo Spy
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Default Batch Sparge Volume Question

I measured my volume after the mash, which was 2.8 gallons. I calculated that I needed 4.2 gallons for my batch sparge water. After the boil, I ended up with 4 gallons instead of 5.

Okay, so here's the question. Do the grains still account for .1 gallon loss during the sparge (this had 9.75 lb. of grains), along with the roughly .5 gallons dead space in my MLT? In that case, my sparge volume should have been 5.7 gallons, right?
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Old 01-18-2009, 04:16 PM   #2
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You should get out very close to what you put in for the sparge since the grains have absorbed water already and the deadspace is filled already.
I would guess your preboil volume was correct and your boil rate was too high but it is hard to say.

I would recommending measuring the preboil volume directly.
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Old 01-18-2009, 04:19 PM   #3
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you need to account for all empty variables(head space, boil off, etc) and full variables (ammount after mash, sparge)....

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Old 01-18-2009, 04:27 PM   #4
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Quote:
Originally Posted by remilard View Post
You should get out very close to what you put in for the sparge since the grains have absorbed water already and the deadspace is filled already.
I would guess your preboil volume was correct and your boil rate was too high but it is hard to say.

I would recommending measuring the preboil volume directly.
I think you're right, it was a cold night, and I was boiling outside, my boil rate was likely off.
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