Calculating water volume - Home Brew Forums

 Home Brew Forums > Calculating water volume

02-17-2011, 05:01 PM   #1
Islandboy85
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How do you go about calculating your water volume you need for sparging? I've had some shortcomings the last few brews, and had to run indoors and heat up a gallon extra. Is there a general rule or some calculation?

02-17-2011, 05:27 PM   #2
rockytoptim

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I use beersmith and it tells me how much sparge water I need. I usually add another gallon to that just so I don't have to hurry up and heat some more if I need a bit more.
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02-17-2011, 05:31 PM   #3
Islandboy85
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I also forgot to add that I am slightly confused by the terminology "drain the mash tun" when people say they drain the mash tun before the sparge. Are you fully draining the wort out, or just draining until there is 1-2 inches of liquid above the gran bed? The same question for the sparge. Do you fully empty the tun or just drain until the liquid level is at the grain bed?

02-17-2011, 05:58 PM   #4
DakotaPrerunner

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total water=(desired post boil volume/0.96)/(0.925)+(lbs grain in mash x 0.2)+loss due to equipment. Roughly

02-17-2011, 06:07 PM   #5
Islandboy85
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V
Quote:
 Originally Posted by DakotaPrerunner total water=(desired post boil volume/0.96)/(0.925)+(lbs grain in mash x 0.2)+loss due to equipment. Roughly
So, if I wanted to get 6.25 gal preboil and had 10# of grist it would be 8.52 gallons total. If I'm using 1.5 qt/# I'd have 3.75 gallons strike water leaving me with 4.77 gallons to sparge. Is that right?

What is the significance of the 0.96 and 0.925 and 0.2 in the formula?

02-17-2011, 06:49 PM   #6
rockytoptim

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Quote:
 Originally Posted by Islandboy85 I also forgot to add that I am slightly confused by the terminology "drain the mash tun" when people say they drain the mash tun before the sparge. Are you fully draining the wort out, or just draining until there is 1-2 inches of liquid above the gran bed? The same question for the sparge. Do you fully empty the tun or just drain until the liquid level is at the grain bed?
I completely drain the mlt before I add my sparge water. Then after adding sparge water I completely drain the mlt.
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02-17-2011, 06:54 PM   #7
Islandboy85
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Quote:
 Originally Posted by rockytoptim I completely drain the mlt before I add my sparge water. Then after adding sparge water I completely drain the mlt.
Crap, maybe that's why I run out of sparge water and have efficiency issues.

02-17-2011, 07:09 PM   #8
Bobby_M
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You have to differentiate between batch and fly sparging. With batch, you drain the tun. With fly, you don't.
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02-17-2011, 07:42 PM   #9
Islandboy85
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Quote:
 Originally Posted by Bobby_M You have to differentiate between batch and fly sparging. With batch, you drain the tun. With fly, you don't.
I've not yet batch sparged. I've heard that it's not quite as efficient, so I didn't want to do any worse than I already did on the last few batches, so I fly sparge. I usually have very little liquid to drain off to begin with sitting on top of the grain bed. The lady at my LHBS said to use more strike water like 1.5 qt/#. She said it helps to give a little more time to establish my flow rate before so I don't run the mash too low and then get channeling.

02-17-2011, 07:58 PM   #10
Bobby_M
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Ok. So basically you should fly sparge with the full preboil volume so when you get all the runoff, the tun is still full.
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