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Home Brew Forums > Home Brewing Beer > All Grain & Partial Mash Brewing > BIAB Brewing > BIAB Brewing (with pics)
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Old 09-18-2011, 07:13 AM   #291
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Whew! Finally read the whole thread! I'm excited to have a new use for my 20g crawdad pot when they're out of season :-)

Re burning bags... Has anyone actually burned one? Reminds me about that experiment when I was a kid. Hold a flame under a styrofoam cup with water and without - check the results (have a receptacle for the one without.....)

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Old 09-18-2011, 11:06 PM   #292
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Great thread! I have a sparging question, though. If you sparge at 170, then you are mashing out at the same time. So how does dunk sparging denature the enzymes in the original wort?

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Old 09-20-2011, 02:26 AM   #293
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Would an 8 gallon brew-pot be big enough to do 5 gallion batches using the BIAB method?

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Old 09-20-2011, 02:30 AM   #294
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Quote:
Originally Posted by CanadianQuaffer View Post
Would an 8 gallon brew-pot be big enough to do 5 gallion batches using the BIAB method?
Depends on how big your grain bill is. For most of my brews, my water amount is between 7-8 gallons (or more!), then add in the grains. FWIW, I'm one of those people who adds all my water and grain, no sparge.

For your size kettle you might need to use one of the sparge methods.
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Old 09-23-2011, 03:36 AM   #295
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Quote:
Originally Posted by eulipion2 View Post
Depends on how big your grain bill is. For most of my brews, my water amount is between 7-8 gallons (or more!), then add in the grains. FWIW, I'm one of those people who adds all my water and grain, no sparge.

For your size kettle you might need to use one of the sparge methods.
Why so much water? I understand that the grain will absorb a lot of it, but don't you let the water from the grain drip back into your prew pot?

Cheers,

Nick
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Old 09-23-2011, 03:49 AM   #296
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Quote:
Originally Posted by CanadianQuaffer

Why so much water? I understand that the grain will absorb a lot of it, but don't you let the water from the grain drip back into your prew pot?

Cheers,

Nick
Yes but not all will drip into the pot even when you squeeze the bag. To determine the amount needed use this formula. Batch size + absorption + boil off + trub loss = water needed. For absorption use grain in lbs. X .08 (or .05 if you squeeze the crap out of the bag like I do.)

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Old 09-23-2011, 04:02 AM   #297
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Do you mean that you multiply grains in pounds x .08 and get a number in gallons? For example:

10# grain x .08 = 0.8 gallons of water lost to absorption?

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Old 09-23-2011, 04:16 AM   #298
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Making an American Stout via BIAB and drinking my own Belgian IPA modeled after Raging Bitch (tasty) as we speak. Smells like coffee and chocolate in the whole house; it's the darkest wort I have made yet and damn does it look good. I appreciate the genius behind BIAB each time I make a batch. keep it simple stupid!

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Old 09-23-2011, 05:13 AM   #299
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Originally Posted by houndsbreath
Making an American Stout via BIAB and drinking my own Belgian IPA modeled after Raging Bitch (tasty) as we speak. Smells like coffee and chocolate in the whole house; it's the darkest wort I have made yet and damn does it look good. I appreciate the genius behind BIAB each time I make a batch. keep it simple stupid!
Let me know how the raging bitch stuff turns out. It's my favorite beer. I'll also be needing the recipe if it's good. Haha.
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Old 09-23-2011, 01:07 PM   #300
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Originally Posted by Perch06 View Post
Do you mean that you multiply grains in pounds x .08 and get a number in gallons? For example:

10# grain x .08 = 0.8 gallons of water lost to absorption?
that's it exactly. that number will give you a little extra in case you boil off more than anticipated. Once you have your system dialed in you can lower that number or raise it depending on how much or little you squeeze the bag. I squeeze the heck out of mine and use .05. here's an example of how I would use the formula.

5.5gallon batch
12lbs grain x .05 = .6 gallon absorption
trub loss .25 gallon
boil off in 1 hour 1.25

5.5 + .6 + .25 + 1.25 = 7.6 gallons of water needed. the nice thing about the formula is. It doesn't matter if you do a full volume BIAB like I do or if you sparge, you still need that much water.
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