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Home Brew Forums > Home Brewing Beer > All Grain & Partial Mash Brewing > Two AG brews down, same problem
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Old 07-08-2012, 05:47 PM   #11
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Originally Posted by Cromwell
Sorry, I'm really confused. How does increasing mash tun deadspace in the software change his gravity, efficiency or boil off rate?
It doesn't, it helps to solve the sparging water volume issue (question 1).


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Old 07-08-2012, 05:53 PM   #12
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It doesn't, it helps to solve the sparging water volume issue (question 1).
OH, I see. Thanks for clarifying.


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Old 07-08-2012, 05:53 PM   #13
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I lose 1.5 gal. an hour easy. Sometimes a bit more.
Thanks Denny. I thought to mention it as I wasn't sure. Maybe I need to boil more vigorously? Although I get a good roiling boil.
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Old 07-08-2012, 05:55 PM   #14
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Sorry, I'm really confused. How does increasing mash tun deadspace in the software change his gravity, efficiency or boil off rate?
It changes the efficiency calculation because it accounts for reduced wort volume.
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Old 07-08-2012, 11:42 PM   #15
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Thanks for all the replies. I increased the dead space measurement by .5gal since that seems to be roughly the amount I'm losing when sparging. Perhaps I'm getting too vigorous a boil going. I just have been reading that I need to make sure I get a good boil to drive off the DMS. I'd definitely say it's a little more than rolling. What are you guy's opinions of this? Either way I increased the boil off rate some to try to account for the loss. As far as the gravity. I definitely could have been off some where. I had a few beers and could have gotten things mixed up. Pie_Man, your math ended up with the post boil SG of 1.074 the recipe estimated. That is part of the reason I was confused. If I pretty much hit my preboil gravity and volume and ended up with 4.9gal instead of 5.5gal afterwards, I would think that topping off to 5.5g would get me at least close to where I wanted to be on the SG. Maybe I'm missing something there. I will be putting some of your suggestions into practice on my next batch and think I'll get some good results. Thanks again.


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