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Old 04-06-2012, 03:26 PM   #1
Monkfish
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Mar 2012
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Hey guys,

I'm doing my first AG using BIAB. I used 7.8 gallons of strike water and mashed #15 for an hour. This is for a 5 gallon recipe calling for a 60 minute boil.

After pulling the bag I squeezed 1+ gallons out of the spent grains - so now I have 7 gallons of wort, pre-boil.

How should I handle this - should I start my hopping as soon as I reach a rolling boil, or should I boil off to 6 gallons and then start hopping for the 60 minute boil?

I'm on new equipment so I'm assuming 1 gal/hr boil off/evaporation.

Any thoughts?

Thanks
MF



 
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Old 04-06-2012, 03:30 PM   #2
BradleyBrew
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Nov 2010
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Boil down until you hit the volume of wort that the hop schedule is calculated too. If not your utilization will be off because of the increased volume of wort being boiled and the length of time the hops are exposed to the boil.

Boil until you hit your target volume, and begin the 60 minute schedule.



 
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Old 04-06-2012, 03:57 PM   #3
FlyDoctor
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Feb 2012
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VOlume aside, do you have the desired pre-boil gravity? If so, then boiling it down may affect the eventual post-boil OG, and thus the final product.

If your at your intended gravity, why not just enjoy more beer?

 
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Old 04-06-2012, 04:21 PM   #4
wolfman_48442
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I sort of agree.
If you've hit your pre-boil gravity, I'd dump the extra wort to be honest. Then boil as scheduled.

If your pre-boil gravity is low, then boil longer, and start your hops additions at their normal times.

Boiling down to volume without gravity checks can get you a different beer if you're not careful.

 
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Old 04-06-2012, 04:50 PM   #5
Monkfish
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Mar 2012
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Thanks guys. I did take a pre boil reading and it was definitely low. I found a calculator online and played with a few numbers and it looks like boiling down to 6 gallons before the official 60 minute boil would put me exactly at my target OG.

I appreciate the quick responses.

 
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Old 04-07-2012, 12:16 AM   #6
smyrnaquince
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Dec 2010
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If by 5 gallon recipe, you mean 5 gallons into bottles, then you'll need around 5.4 gallons into the fermenter (to allow for fermenter loss) and around 6.3 gallons at the end of boil (at ambient) to allow for kettle loss. If you boil for an hour at a 1 gal/hour evaporation rate, you'd want around 7.3 gallons pre-boil.

I'm not sure you have a problem.

 
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Old 04-09-2012, 11:11 AM   #7
FlyDoctor
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A whole gallon for trub loss? Seems extreme.

 
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Old 04-09-2012, 11:23 AM   #8
william_shakes_beer
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If you have high volume AND your OG is correct, you can also can the extra wort and use it for starters in the future.

 
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Old 04-13-2012, 01:13 AM   #9
smyrnaquince
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Quote:
Originally Posted by FlyDoctor View Post
A whole gallon for trub loss? Seems extreme.
That's what comes from blindly using numbers without thinking about them. I missed this comment that came with the sample recipe I scaled: "The above assumes loose pellet hops and only clear, chilled wort transferred from the kettle using no trub management techniques. Experienced brewers should adjust 'Loss to Trub and Chiller' and 'Brewhouse Efficiency' accordingly to suit their trub management techniques."

Sorry.

 
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Old 04-13-2012, 02:17 AM   #10
D_Nyholm
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Mar 2011
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Quote:
Originally Posted by smyrnaquince
if by 5 gallon recipe, you mean 5 gallons into bottles, then you'll need around 5.4 gallons into the fermenter (to allow for fermenter loss) and around 6.3 gallons at the end of boil (at ambient) to allow for kettle loss. If you boil for an hour at a 1 gal/hour evaporation rate, you'd want around 7.3 gallons pre-boil.

I'm not sure you have a problem.
+1



 
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