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Old 08-18-2011, 03:22 AM   #1
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Default Boil Kettle Dead Space & Mash Tun Dead Space

I just did 5 consecutive dry runs (water only) and got the same results 5 times in a row. After filling with 4 gallons of water (just what was handy) and draining back into my carboy my 15 gallon Blichmann Boilermaker leaves behind .75 cups of water and my 10 gallon Igloo converted mash tun with false bottom leaves 3 cups of water behind. I understand that trub/wort/hops have an effect on the actual amount of liquid left behind. I did one batch with this new equipment and ended up not boiling off anywhere near I anticipated. What would be a good "educated" amount to input for kettle loss and mash tun loss into my brew software?

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Old 08-18-2011, 03:38 AM   #2
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I would GUESS 2 cups??? Or roughly half of the actual for each? Or you could just input the entire amount as loss and end up w/ 1.125 additional cups of wort... Might we be splitting hairs here

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Old 08-18-2011, 03:42 AM   #3
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I would GUESS 2 cups??? Or roughly half of the actual for each? Or you could just input the entire amount as loss and end up w/ 1.125 additional cups of wort... Might we be splitting hairs here
And I thought i was OC!

Cheers!
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Old 08-18-2011, 03:57 AM   #4
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I would GUESS 2 cups??? Or roughly half of the actual for each? Or you could just input the entire amount as loss and end up w/ 1.125 additional cups of wort... Might we be splitting hairs here
I am not following your math. If the kettle is .75 cups and the tun is 3 how do you come up with 1.125 cups additional? The software has inputs for both pieces of equipment's dead space, so I was thinking double each left over amount and say 1.5 cups for kettle loss and 6 cups for tun loss. Input?
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Old 08-19-2011, 12:13 AM   #5
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anyone?

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Old 08-19-2011, 01:51 AM   #6
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My guess is that "1.125 cup" figure assumes that only a third of your test loss volumes would translate to actual loss of wort. That would make more sense to me than doubling your test losses.

Have you actually tested your BK boiling losses yet? It's likely going to be way higher than the trivial dead space losses you've detailed...

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Old 08-19-2011, 03:34 AM   #7
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Originally Posted by day_trippr View Post
My guess is that "1.125 cup" figure assumes that only a third of your test loss volumes would translate to actual loss of wort. That would make more sense to me than doubling your test losses.

Have you actually tested your BK boiling losses yet? It's likely going to be way higher than the trivial dead space losses you've detailed...

Cheers!
I did but it was the day I got it, and was so hyped on the new equipment I just made adjustments to get where I needed without documenting anything. I realize that there will be "a lot" more left behind than the minimal amount of water I saw, but I was wondering if there was some equation someone figured out to get me in the ball park.
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Old 08-21-2011, 12:01 AM   #8
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Anyone have their calibrated amounts they got from just water and then compared to actual wort left behind?

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Old 08-22-2011, 01:35 PM   #9
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So I ended up brewing based on my observation amounts from the dry run. Needless to say, I under estimated everything. I recorded 1.25g boil off but actually did 2g. I ended up with 8.5 cups left in the boil kettle instead of .75, and ended up leaving behind 4 cups instead of 3 in the mash tun.

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