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Old 08-13-2010, 06:28 PM   #1
tobrew
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Default All grain partial boil

Is it possable to do a partial boil using all grain? The problem I have is my well that use to chill full boils dryed up. So i was wondering if I mash and collect 3gallons of wort,boil,cool and than top off in the fermenter would it be ok? Any draw backs from doing this?
Mike

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Old 08-13-2010, 06:52 PM   #2
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You should search brew in a bag (BIAB). That's probably what you will end up doing.

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Old 08-13-2010, 08:00 PM   #3
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You would (if I understand the question) be doing a higher gravity brew, then diluting with water to reach whatever target gravity. You would have to adjust your hopping and whatnot and take all of that in account.

I personally can't stand not being able to do full boils. I would probably do as JJL suggests and BIAB.

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Old 08-13-2010, 08:05 PM   #4
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I was just looking at the BIAB method. Think I will go that route until we get some rain..
Thanks

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Old 08-13-2010, 09:11 PM   #5
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Partial boil all grain is very inefficient. You'd be better off doing a partial mash, then augmenting with some extract.

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Old 08-13-2010, 09:17 PM   #6
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I don't see how BIAB is going to help with your cooling issue.

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Old 08-13-2010, 11:04 PM   #7
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Quote:
Originally Posted by Bobby_M View Post
Partial boil all grain is very inefficient. You'd be better off doing a partial mash, then augmenting with some extract.
I think Bobby_M is right, but if you fly sparge, you may be able to get away with it.
For many years, I fly sparged with a 5g Rubbermaid cooler. With that setup, I always needed to collect a full boil volume from the sparge. A few years ago, I changed to a 10g Rubbermaid cooler. With this, I find that normally I need to stop the sparge before I have collected the full volume. For simplicity, I make up the volume prior to the boil, but it would certainly be possible to do a partial boil, and make up the volume post boil, without losing any efficiency.
With the 10g cooler, If I sparge for 40 minutes, I need to collect the full volume, but if I sparge for 90 minutes, I can stop the sparge at about 85% of the full volume with virtually no loss of efficiency.
This would indicate that I could do a partial boil with about 85% of the full boil volume. With a different MLT geometry, it may be possible to reduce this %age even further, and make a partial boil with AG possible with minimal efficiency loss.

-a.
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