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Old 01-15-2007, 08:57 PM   #1
sonvolt
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Default 5 gal gott mash tun - pushing the limits

I just mashed in - 14.5 lbs. of grain . . . in a 5 gallon Gott cooler. I was worried about getting this much in, but I made it. I hit it with 1.03 quarts per pound. It is a pretty thick mash, but I think I will be alright.

Brewing a maibock.



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Old 01-15-2007, 08:58 PM   #2
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Are you fly sparging or batch? I bought a bigger cooler because I wanted to be able to make beers with that much grain, and was worried I wouldn't be able to batch sparge in it.



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Old 01-15-2007, 09:04 PM   #3
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Quote:
Originally Posted by the_bird
Are you fly sparging or batch? I bought a bigger cooler because I wanted to be able to make beers with that much grain, and was worried I wouldn't be able to batch sparge in it.
I will fly sparge, but I can't think of why I couldn't batch sparge it.

BTW, FWIW . . . I found this bit about mash thickness in Palmer's book. It verifies that I was wrong in a much earlier thread about mash thickness.

Quote:
The grist/water ratio is another factor influencing the performance of the mash. A thinner mash of >2 quarts of water per pound of grain dilutes the relative concentration of the enzymes, slowing the conversion, but ultimately leads to a more fermentable mash because the enzymes are not inhibited by a high concentration of sugars. A stiff mash of <1.25 quarts of water per pound is better for protein breakdown, and results in a faster overall starch conversion, but the resultant sugars are less fermentable and will result in a sweeter, maltier beer. A thicker mash is more gentle to the enzymes because of the lower heat capacity of grain compared to water. A thick mash is better for multirest mashes because the enzymes are not denatured as quickly by a rise in temperature.
As I am brewing a Maibock and looking for a good malt character for this one, I think that my thick mash may be a nice accident.
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Old 01-15-2007, 09:07 PM   #4
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Personally, I like having extra room in my MLT so that when batch sparging, I can stir it up nice, get some of my sparge water in there before taking my first runnings, and give it plenty of room to dissolve the sugars. That's what made me nervous about doing big beers in that cooler. Power to you, man!

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Old 01-15-2007, 09:33 PM   #5
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Quote:
Originally Posted by the_bird
Personally, I like having extra room in my MLT so that when batch sparging, I can stir it up nice, get some of my sparge water in there before taking my first runnings, and give it plenty of room to dissolve the sugars. That's what made me nervous about doing big beers in that cooler. Power to you, man!
Yeah . . . we'll see how it works?
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Old 01-15-2007, 10:54 PM   #6
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wow... nice one on 14lbs in the five gallon... a few weeks back we stuffed our ten gallon mlt with 21 lbs of grain and fly sparged for ages... it almost was too much for it...

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Old 01-15-2007, 11:00 PM   #7
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Just for the record

5 gal mash tun + 14.5 lbs. grain = heavy grain bed/stuck mash

Then, I stirred the hell out of it trying to get the grains in suspension, hoping this might unstuck the mash . . . . knocked off my mainifold/false bottom

Anyway . . . I am back to sparging now . . . after a big mess.

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Old 01-15-2007, 11:17 PM   #8
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I did about 13 pounds in 5 gal cooler. it was the longest sparging time of my life. I had the valve wide open and it just slowly dripped out.

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Old 01-15-2007, 11:22 PM   #9
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I have no problem batch sparging 12 Lbs of grain in a 5 gallon Igloo cooler.

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Old 01-16-2007, 02:10 AM   #10
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Just an update. Threw this in the fermenter a few minutes ago. Despite the sparge problems, I hit my target gravity on the money - 1.072. My efficiency was also really good.



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