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Old 02-27-2013, 06:28 PM   #1
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Default how to calculate expected FG based on reading from beginning of boil?

One of my problems has always been awful efficiency. Until I can work to fix it I was thinking of adjusting my mash by adding DME to compensate at the beginning of the boil to bring it up to the gravity it should be. Anyone know the math I should use to compensate based on a gallon per hour boiloff based on my original gravity readings before the boil?


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Old 02-27-2013, 06:34 PM   #2
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It's all in the free "how to brew" by Palmer online


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Old 02-27-2013, 06:45 PM   #3
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C1*V1=C2*V2. C=concentration(gravity) V=volume. Drop the decimal if you're using SG (so 1.045 would be 1045). Or just use this calculator: http://www.brewersfriend.com/dilutio...ty-calculator/. I'm sure there's a bunch of other calculators online too.
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Old 02-27-2013, 07:56 PM   #4
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Quote:
Originally Posted by peterj View Post
Drop the decimal if you're using SG (so 1.045 would be 1045).
you'd use 45, not 1045
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Old 02-27-2013, 08:16 PM   #5
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Quote:
Originally Posted by dcp27 View Post
you'd use 45, not 1045
Whoops, you're right. My mistake.
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Old 02-28-2013, 02:07 AM   #6
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Quote:
Originally Posted by Eddiebosox View Post
One of my problems has always been awful efficiency. Until I can work to fix it I was thinking of adjusting my mash by adding DME to compensate at the beginning of the boil to bring it up to the gravity it should be. Anyone know the math I should use to compensate based on a gallon per hour boiloff based on my original gravity readings before the boil?
I wouldn't add it at the beginning of the boil. Do your boil, take a gravity reading and see how many points you need. At this point you know your final volume and don't have to worry about boil off issues.

Add the appropriate amount of DME at flameout....dissolve well, take another gravity reading.

So lets say there are 6 gallons in the BK and the SG is 1.050.....but you want 1.060. So you need 10 more points. ppg = 10 points X 6 gallons = 60 ppg required. DME is 46 ppg so you would need 1.3 pounds (60/46) of DME to raise that 6 gallons to 1.060
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Old 02-28-2013, 05:43 AM   #7
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Just use more grain if your eff is lower than expected.


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