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Home Brew Forums > Home Brewing Beer > All Grain & Partial Mash Brewing > Too much liquid left in my mash tun?
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Old 11-01-2011, 06:39 AM   #1
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Default Too much liquid left in my mash tun?

Friends, after 6 months of extract brewing I am making the transition to AG! I have made a mash tun from a 10g Igloo cooler. I have made a false bottom from a piece of perforated stainless steel and put together some fittings, ball valve etc... I tested it tonight by filling it with a few gallons of water and then draining. After the tun had stopped draining, I found that it still had a half a gallon of water in it. After doing some research it seems that this type of false bottom usually abandons more liquid in the tun than some others. I read one example for estimating mash water volume, and it even used 0.5 gallons in the example equation (maybe they used 0.5 to make the example easy?):

http://www.brew365.com/technique_cal...ter_volume.php

I can't help but feel like this is too much, and will kill my efficiency. I am hoping some of you who have a similar set-up will lend some advice.

YIB, JDub

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Old 11-01-2011, 06:45 AM   #2
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Friends, after 6 months of extract brewing I am making the transition to AG! I have made a mash tun from a 10g Igloo cooler. I have made a false bottom from a piece of perforated stainless steel and put together some fittings, ball valve etc... I tested it tonight by filling it with a few gallons of water and then draining. After the tun had stopped draining, I found that it still had a half a gallon of water in it. After doing some research it seems that this type of false bottom usually abandons more liquid in the tun than some others. I read one example for estimating mash water volume, and it even used 0.5 gallons in the example equation (maybe they used 0.5 to make the example easy?):

http://www.brew365.com/technique_cal...ter_volume.php

I can't help but feel like this is too much, and will kill my efficiency. I am hoping some of you who have a similar set-up will lend some advice.

YIB, JDub

I have a 13 gallon rectangular igloo mash tun with a bazooka screen and no false bottom and I leave approximately .25 gallons behind. If worse comes to worse, you can compensate for the extra liquid by upping your grain bill a bit. Costs more in the long run, but you can at least get your efficiency up.
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Old 11-01-2011, 07:41 AM   #3
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Batch sparging or fly? If batch sparging, the easy solution is to tilt the cooler to drain the rest of the wort out. That's what I did when I used a 10 gal Igloo cooler MLT.

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Old 11-01-2011, 01:20 PM   #4
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Batch sparging or fly? If batch sparging, the easy solution is to tilt the cooler to drain the rest of the wort out. That's what I did when I used a 10 gal Igloo cooler MLT.
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I tilt, but I don't go crazy. I entered into BeerSmith my deadspace and calculated my volumes to take into account that loss. I tilt until it becomes a trickle and move on to the sparge. I then sparge until I hit my preboil volume. Whats left should come out in the sparge.
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Old 11-01-2011, 01:32 PM   #5
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If you are batch sparging, or better yet doing a double batch sparge, the runnings left in the tun are fairly low gravity and won't impact efficiency that greatly. Tilting the tun will also work...RDWHAHB

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Old 11-01-2011, 02:04 PM   #6
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Did you have a piece of tubing hooked up to your ballvalve for your test? The reason I ask is when the level of the liquid drops, the tubing into the runnings works as a siphon and "pulls" the liquid out from the MLT.

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Old 11-01-2011, 03:38 PM   #7
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Did you have a piece of tubing hooked up to your ballvalve for your test? The reason I ask is when the level of the liquid drops, the tubing into the runnings works as a siphon and "pulls" the liquid out from the MLT.
dip tube!
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Old 11-01-2011, 07:07 PM   #8
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As said, tilt or install a p/u tube. I use a chest cooler and tilt. Virtually no wort is left.

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Old 11-01-2011, 08:12 PM   #9
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Just for comparison, I also use a 10gallon Igloo cooler. I have a false bottom with a dip tube that gets down pretty low in the cooler.

I tested it the other day and it only left exactly 8ounces of liquid behind.

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Old 11-01-2011, 08:18 PM   #10
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Yes, you need a diptube. But I was serious about needing tubing from the ballvalve to the fermenter. Try it! Do it without any tubing and then do it with the tubing. The tubing should end lower than where you start, like on the ground in a fermenter, and it will "pull" out the liquid like a siphon.

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