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Old 01-14-2013, 12:26 AM   #1
CMS79
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Default Over shot my OG

Today I brewed a pale ale. My post boil gravity is reading 1.080. I was shooting for about 1.054-56. I rounded up the grain bill slightly but didn't. Expect this big of a jump. What can I do to lower the gravity? Can I add water and split to two fermenters?


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Old 01-14-2013, 12:58 AM   #2
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You could add water.

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Old 01-14-2013, 01:04 AM   #3
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Before you do anything, post your actual numbers and process. It is pretty much impossible to overshoot your gravity by over 50%.
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Old 01-14-2013, 01:12 AM   #4
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14.5 # 2 row

1.5 # crystal 60

I brewed in a bag starting with 8.5 gallons. Mashed in at 162 for an hour it held about 154. Post boil was about 6 gallons.

I really have no clue where I went wrong.
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Old 01-14-2013, 01:26 AM   #5
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It doesn't sound like you did anything wrong except you were expecting about 55% efficiency and got about 82% instead (if your post boil volume measurement is correct). 55% is pretty low, what were you basing that on?
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Old 01-14-2013, 02:16 AM   #6
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Quote:
Originally Posted by chickypad
It doesn't sound like you did anything wrong except you were expecting about 55% efficiency and got about 82% instead (if your post boil volume measurement is correct). 55% is pretty low, what were you basing that on?
I really wasn't. I left my computer behind and went ahead with a recipe without getting the numbers crunched.

Where is a good baseline to set the efficiency in beersmith? Should I start around 70%?
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Old 01-14-2013, 03:39 AM   #7
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You would want to set it at what you typically get on your system, and if your volumes and measurements are right you just got over 80%. If you've done other batches with the same method I would crunch the numbers and see if that's reproducible, then set your expected efficiency accordingly.
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Old 01-14-2013, 04:10 PM   #8
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82% seems pretty high for BIAB. Are you sure about your OG?
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Old 01-14-2013, 04:34 PM   #9
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Quote:
Originally Posted by Dynachrome View Post
You could add water.

Calculator
I just overshot a stout, boiled off too much. I guessed about how much water to top off with, and I just plugged in my numbers to this calculator. Turns out I guessed right. Thanks for the link, I'll probably use it again.
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Old 01-14-2013, 05:22 PM   #10
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I don't find 82% to be that high. Based on the calculations that Hopville.com's recipe calculator produces for my brews, I get usually get between 80 and 86% for brews based mainly on British pale malt, mashing at 66-68C for 1.5-2 hrs, and 75% or a bit more if there is a good proportion of other stuff like oat flakes or roasted malts. I also use a grain bag, mashing in a boiler. My OG is always higher than the calculator estimates for the recipe. I haven't actually calulated the amount empirically myself though. 55% would be very low indeed. From your description I would expect 82% or thereabouts, sounds fine to me.

I just fed your grain bill (based on 7 1/2 lbs Great Western Premium 2-Row Malt and 1 1/2 lbs American Crystal 60L) into hopville.com's beer calculus and it estimates it would take 89% efficiency to get an OG of 1.080, which really does sound very high. Clearly it is calculating differently from the one you use!


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