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Old 05-06-2012, 07:26 PM   #1
Patirck
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Default Any tips on how to brew a higher gravity beer than your mash tun will allow?

I have a 15 gallon tri clad pot - the very common type. It has a false bottom at about the two gallon mark. It is direct fire (on a single tier stand with automation). I want to brew 11 gallons of imperial stout at an og of 1.090. I plan on an efficiency of 65% (I usually get 70 - 75 but I like to play it safe).

The recipe calls for a combined total of 41 lbs of grain. According to Bobby M's table - I max out at 37ish with a 15 gallon mash tun. I would be nervous even getting even close to that amount of grains in a 15 gallon pot.

What is the best way to deal with this? I'm hoping someone has a trick to do this without having to essentially mash twice. The only thing I have come up with is doing two separate mashes and combining the wort but I'm unsure if this will cause any flavor differences. I guess I could package the grains as two 5.5 gallon batches with the same ratios base/specialty grains in each batch and just do two separate mashes but I was hoping to shorten the brew day a bit more.

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Old 05-06-2012, 07:49 PM   #2
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You can figure out how much malt extract would be required to get your OG where you need it after you max out your mashtun. I would think your only other option is two mashes, and then combining them.

And this isn't really a problem, as you can easily split the grains down the middle and have close enough to an even distribution to get really similar worts. It will just be a longer brewday. Personally, I would probably go the extract bump-up route. Unless you are that purist that has a moral objection to using DME in your AG brewing

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Old 05-06-2012, 08:04 PM   #3
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I would go with using extract, too. You'll still get the flavor of having a mash, but it'll save you a lot of time.

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Old 05-06-2012, 08:08 PM   #4
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Get this book. There is a chapter on what you are wanting. A must have for any brewer.

http://www.amazon.com/gp/aw/d/093738...6334789&sr=8-1

Designing Great Beers by Ray Daniels.

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Old 05-06-2012, 10:46 PM   #5
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Yep, I'd just add DME for this. It's the easiest way to get that gravity boost for those final few points, and in a big beer like a RIS, those few pounds of DME won't change your flavor profile as it might in a beer that requires low mash temps.

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Old 05-07-2012, 04:23 PM   #6
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I know you want an 11 gallon batch, but you could just scale back the recipe to a volume that will fit your equipment.

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Old 05-07-2012, 04:59 PM   #7
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With your criteria you'd either have to use some DME or a magic wand...

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Old 05-07-2012, 07:48 PM   #8
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Where can I pick up this magic wand? My LHBS has run out of them.

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Old 05-07-2012, 08:31 PM   #9
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Partial mash or double batch.

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Old 05-07-2012, 08:41 PM   #10
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Quote:
Originally Posted by smyrnaquince View Post
I know you want an 11 gallon batch, but you could just scale back the recipe to a volume that will fit your equipment.
I ended up brewing a big Imperial Stout and ended up doing this exactly. Since I didn't have enough room in my kettle I just ended up doing a 3 gallon batch.
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