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Old 11-04-2013, 05:55 PM   #11
day_trippr
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10-4 on never, ever stirring the mash once a fly sparge begins. It totally defeats the whole point of fly sparging, and ends up being an inefficient batch sparge.

I'd be interested in knowing what grain mill comes with a recommended gap setting of .050". That right there is definitely the beginning - and likely largest contributor thereto - of the efficiency problem...

Cheers!

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Old 11-04-2013, 05:58 PM   #12
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Originally Posted by BrewHark View Post
peterj : That's what I'm afraid of. With a 12# grain bill, I will use 4 gals of water, in addition to the 2 gals I fill my tun to get to the false bottom. To get 6.5 gals to the kettle with nothing left in the tun and after accounting for absorption, I would only be able to sparge with about 3 gals of water. That doesn't seem like enough. So I have been sparging with 4-5 gals of water and pitching some of the wort. I am going to try the dip tube as the poster above suggested, but that still doesn't help with the dead space issue. I hate to lose the false bottom because it works like a charm (and wasn't cheap!). I'm flummoxed.
Yeah I would think a dip tube should do the trick. That should decrease your deadspace so you won't be leaving as much behind.

Now when you say you're pitching some of the wort, what do you mean? Like you're pitching out wort that you drained out? The wort that you drain out first is the most concentrated, and it becomes less and less concentrated as you continue to sparge. If you're pitching out some of your first runnings so you can fit more second runnings (or sparge runnings I guess? Sorry I batch sparge.), you're choosing less concentrated wort over more concentrated which is also bad for effeciency. You should sparge until you hit your pre-boil volume and then stop, no matter how much sparge water you used. This will leave the least concentrated wort behind in the dead space.
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Old 11-04-2013, 06:08 PM   #13
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My vote is to tighten the gap on your mill. .05" is pretty wide. I have mine set to .032", but wouldn't go any tighter than that. I still only get around 75%. As long as it's consistent, I don't care about how high it is.

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Old 11-04-2013, 06:52 PM   #14
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I would say your issue is 3 fold.

First off I would consider a redesign w/ 2 gallons of dead space.

Second would be your grain crush. I run my grain through at .032" then do a second pass and tighten it up just a bit. I run about a 92% mash efficiency and 82% brewhouse efficiency.

Third I would never stir your mash during the sparge. Let it settle and clear, run it slow.

You will likely see a large jump by removing the dead space, then another substantial increase from a more fine crush and yet even more by not stirring.

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Last edited by joelrapp; 11-04-2013 at 06:53 PM. Reason: changed .32 to .032"
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Old 11-05-2013, 12:53 AM   #15
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Tighten your mill gap, then decrease that 2 gallons of dead space. Don't chuck wort, too, concentrate it with your boil.

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