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Old 04-03-2012, 02:45 AM   #1
omokoro
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Default Unexpectedly High Original Gravity

Saturday I brewed my fourth batch of AG beer, an APA. Based upon my previous batch which had a efficiency of 69%, I estimated this last batch at 70%. The measured original gravity was 1.070, I expected 1.053. I am only doing one gallon batches. This time I performed a double batch sparge, while in the previous batch I only performed one batch sparge. Could this explain the difference in efficiency? I also went to a different homebrew store, so I suppose their grain mill could have contributed as well to the increased efficiency. Also, is this some sort of anomaly-- can I expect to reproduce the results in future, especially when I scale my system up?

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Old 04-03-2012, 02:52 AM   #2
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A double batch sparge will extract more sugar from the grain.

what are you using as a mash tun?

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Old 04-03-2012, 02:58 AM   #3
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Since I am only doing 1 gallon batches, my mash tun is a 6 quart pot, which I lauter the wort using a colander into 12 qt pot for boiling. Then I return the grain back into the mash tun, along with water from my "HLT" for batch sparging.

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Old 04-03-2012, 04:58 AM   #4
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Quote:
Originally Posted by omokoro
Also, is this some sort of anomaly-- can I expect to reproduce the results in future, especially when I scale my system up?
It's tough to know exactly what to expect when changing multiple variables.

The grain crush can have a big effect on efficiency. Your sparging technique can too.
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Old 04-03-2012, 09:09 AM   #5
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What did you do with it. Did you add water to bring it down or did you leave it and just have a higher OG.

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Old 04-03-2012, 02:43 PM   #6
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Quote:
Originally Posted by uncommonsense View Post
What did you do with it. Did you add water to bring it down or did you leave it and just have a higher OG.
Actually, my original reading was 1.090 before I topped it off. I am sure I broke a couple of cardinal rules. I did not end up with my desired volume, so I add some water to the (1 gallon) carboy, shook it up with my sanitized hand on top, then took another reading. The water I added took it down to 1.070. I guess in the future I'll keep some sanitized water on hand. If fermentation stops in the 1.015-1.020 range, I should have a beer with close to ~ 7% abv (est. 5.5% abv), which I don't mind, as long as it tastes balanced.

I just hope I can reproduce these results, since I will be basing my future recipes on 85% efficiency.
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Old 04-08-2012, 04:09 PM   #7
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I've topped up with green garden hose water and had no issues. YMMV

I've also used a gallon of grocery store distilled water.

I would not expect that level of efficiency in a 5 gallon batch.

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