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-   -   crap I forgot to calculate my pre-boil (http://www.homebrewtalk.com/f39/crap-i-forgot-calculate-my-pre-boil-360993/)

 ThePonchoKid 10-14-2012 02:48 PM

crap I forgot to calculate my pre-boil

I've been doing 7.25 gal for 10 lb grain brew. This time I'm doing 13lbs of grain in my boilermaker 10. I tried a calculator online but it has confusing entries that are perhaps more designed for mash tuns?

Would anyone tell me how much water I need here?

 ThePonchoKid 10-14-2012 03:13 PM

bah even this simple biab calc is punching out numbers that make no sense to me

 dbrewski 10-14-2012 03:18 PM

If you are asking about grain absorption, try using .16 gallons per pound of grain. If 7.25 worked for you for 10lbs, the additional 3 lbs would absorb .16*3 = .48 or about half a gallon additional. So roughly 7.75G instead of 7.25G. Does that sound right?

 bduane 10-14-2012 03:19 PM

Grain absorbs approximately 0.1 gallons per pound (depending on the moisture of the grain). So, you will need approximate 0.3 more gallons.

If it were me, i'd aim a little on the high side, if my boil volume was too much, id boil a little longer to compensate.

Another option is using some "top-off" water to get up to your volume. When you are using BIAB, i don't think a 1/4 of a gallon will get you any more/less efficiency when you are boiling it off anyways.

 ThePonchoKid 10-14-2012 03:21 PM

I think I got the number right on the simple calculator. There's just a bunch of other numbers that confused me. It's suggesting 7.61gal. That's probably spot on seeing as I squeeze the crap out of my bag :) Thanks for holding my hand for a second there :)

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