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Old 10-12-2009, 01:17 AM   #1
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Default OG short by about .06

I brewed an all grain steam beer today. My pre-boil OG was dead on with what Beersmith calculated, but my post-boil OG was ~ 1.046 when it should have been 1.052. The calculated bitterness ratio was .829.
Of course, the problem was that not enough water evaporated during the boil. But I'm not sure why. Ever since I started using Beersmith a few months ago, I've been so much more successful hitting target gravities. Not sure how my evaporation rate was off as it was today. Any ideas?

Also, do you think that this beer is going to be very different at 1.046?

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Old 10-12-2009, 01:21 AM   #2
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I cannot tell you, but the same thing happened to me on my last batch. Normally I hit my target volumes and gravities right on the money, but the last one just didn't boil off as much as expected. I ended up having 3/4 of a gallon more than I planned for and the batch size was only 2.5 gallons. (!)


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Old 10-12-2009, 02:02 AM   #3
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Temperature changes and altitude can affect boil off rates. And no, your beer won't be much different with a .006 difference.
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Old 10-12-2009, 08:29 PM   #4
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I just brewed my Xmas Ale this morning and discovered that my post-boil OG was 1.042 (way down from 1.052) due lack of evaporation during boil. Couldn't get a good 7gal rolling boil going with the house windows open and cold weather. Have to keep the windows open or the wife complains of the smell. So, not much choice there. I did a lot better with an Irish Ale two weeks ago, hitting 1.050 (expected 1.052) with much warmer weather.

So, my question is... should I boil a lesser amount and add cold water at the end? or boil longer? If I boil longer how does this effect my hops additions?

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Old 10-12-2009, 09:35 PM   #5
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From what I've read, hops additions have little effect on the beer after 60 minutes. So....if you used bittering hops at 60 minutes, then later in the boil decided you needed to boil longer, it probably wouldn't make much of a difference. As long as you keep your aroma and flavor hops at the right times.
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Old 10-12-2009, 10:39 PM   #6
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Did you correct for the temp of the sample?
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Old 10-12-2009, 10:46 PM   #7
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Quote:
Originally Posted by Gremlyn1 View Post
Did you correct for the temp of the sample?
Well, my thermometer got screwed up on brew day (I think the metal braid got wet), so I had to guestimate.
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Old 10-13-2009, 05:51 AM   #8
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Quote:
Originally Posted by Pickngrin View Post
Well, my thermometer got screwed up on brew day (I think the metal braid got wet), so I had to guestimate.
Metal braid + thermometer = ??
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Old 10-13-2009, 12:18 PM   #9
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Quote:
Originally Posted by Gremlyn1 View Post
Metal braid + thermometer = ??
It's the metal braid that connects the digital thermometer unit to the probe. When it gets wet, the thermometer readings becoming wildly inaccurate. I believe that I may be able to dry out the braid to fix the problem, hopefully.
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Old 10-13-2009, 12:27 PM   #10
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I dont think you want to collect less preboil volume. Doing this will worsen your issue and you will have less sugars post boil. I collect more and boil for 90 minutes or until I reach my target volume. I make notches/markings on my spoons/paddles so that I know where 5g, 6g,7g and 8g are at in the kettle. The only time it gets tricky is with additions of flavor /aroma hops at 15 minutes, but its not a big deal. If I get close to target volume, I just put in the the immersion chiller, add flavor hops addtions and stop after 15 minutes. Its all part of refining your process. The point is that you shouldnt be surprised when transferring to the carboy that you've boiled off less, you should know this prior to flame out and be able to make adjustments.


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