Author Topic: Batch Sparge thin mash question  (Read 1668 times)

Offline trapae

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Batch Sparge thin mash question
« on: May 17, 2014, 06:27:48 PM »
Dealing with something I haven't come upon yet in Brewing.
I usually batch Sparge with a pre-boil volume of about 8 gallons trying to get about 4 gallons first and second runnings per Denny's advice. The recipe I'm doing tomorrow for my wife calls for 2 pounds of honey in the last five minutes. Therefore I only have about 5.9 pounds of grain for the mash. If I do my typical equal half and half first and second runnings, it seems like the mass will be extremely thin. Is that okay or does it do something funky to the pH? I'm thinking my strike water volume should be way less?
Any advice would help, thanks.
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Offline klickitat jim

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Re: Batch Sparge thin mash question
« Reply #1 on: May 17, 2014, 06:48:56 PM »
I would no sparge and estimate my grain bill at about 65% brew house efficiency

Offline denny

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Re: Batch Sparge thin mash question
« Reply #2 on: May 17, 2014, 07:03:43 PM »
I would no sparge and estimate my grain bill at about 65% brew house efficiency

THIS^^^^^
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Offline trapae

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Re: Batch Sparge thin mash question
« Reply #3 on: May 17, 2014, 07:11:25 PM »
Crap, all the grain is measured and bought and I don't have time to buy more for a decreased efficiency. Any other suggestions?
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Offline denny

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Re: Batch Sparge thin mash question
« Reply #4 on: May 17, 2014, 07:18:39 PM »
Crap, all the grain is measured and bought and I don't have time to buy more for a decreased efficiency. Any other suggestions?

Forget the 1/2 and 1/2 thing...it doesn't make all that much difference.  Mash with 1.25 qt./lb., sparge with whatever it takes to hit your boil volume.
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Offline trapae

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Re: Batch Sparge thin mash question
« Reply #5 on: May 17, 2014, 07:43:06 PM »
Cool, sounds like a plan. Thanks Danny, figured you would have a good idea.
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Offline klickitat jim

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Re: Batch Sparge thin mash question
« Reply #6 on: May 17, 2014, 07:52:23 PM »
If you're using a cooler mash tun it seems like it will be pretty important to preheat it. Thats less than 2 gallons of mash water... might be a challenge to keep the temp up

Offline trapae

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Re: Batch Sparge thin mash question
« Reply #7 on: May 17, 2014, 08:12:02 PM »
Good point, I always preheat, but maybe I'll also start a little higher temp too.
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Offline klickitat jim

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Re: Batch Sparge thin mash question
« Reply #8 on: May 17, 2014, 09:19:07 PM »
Do you keep a little light DME around? Might come in handy for adjusting preboil gravity. If you have some you might do a no sparge and bump it a bit with DME to account for low efficiency. I'm guessing it would take maybe 10-12 ounces.

Offline trapae

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Re: Batch Sparge thin mash question
« Reply #9 on: May 18, 2014, 12:01:44 AM »
Does using large sparge volumes only extract tannins if fly sparging?
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Offline klickitat jim

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Re: Batch Sparge thin mash question
« Reply #10 on: May 18, 2014, 12:28:47 AM »
Mmmm yes and no. Its a pH issue. If you are keeping your pH in the neighborhood of 5.4 then you'll be fine. If you are not controlling pH then a big gob of 7+ water on a little bit of grain with little buffering... you could extract tannins. Fly or batch.

Offline euge

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Re: Batch Sparge thin mash question
« Reply #11 on: May 18, 2014, 03:06:43 PM »
Just figure it via the qt/# as denny stated. You can then correct any gravity issues with extra honey or by reducing the sparge water you'll be adding to make up the rest of the volume.

IMO you'd be fine with the thin mash. I mash upwards if 2qt per sometimes.
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Offline trapae

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Re: Batch Sparge thin mash question
« Reply #12 on: May 18, 2014, 06:31:52 PM »
I was thinking about doing the mash small volume like I'm doing my normal 50/50 1st and 2nd runnings, then just adding extra water in the kettle to make my preboil volume .
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Offline morticaixavier

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Re: Batch Sparge thin mash question
« Reply #13 on: May 18, 2014, 07:28:51 PM »
Then you will take a big hit in efficiency. better to do no sparge or two sparge steps.
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Offline erockrph

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Re: Batch Sparge thin mash question
« Reply #14 on: May 19, 2014, 04:06:32 AM »
Just figure it via the qt/# as denny stated. You can then correct any gravity issues with extra honey or by reducing the sparge water you'll be adding to make up the rest of the volume.

IMO you'd be fine with the thin mash. I mash upwards if 2qt per sometimes.

I no-sparge using my full volume in the mash. I am over 4 qt/lb on some session beers. It's not until you start getting close to 4 qt/lb where you might see your efficiency start to dip. The 2-3 qt/lb range will work perfectly well for a mash thickness. I'd wager to say you may even see a bit of an efficiency boost. Don't be afraid of a thin mash.
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