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Old 08-06-2012, 04:01 PM   #181
Denny
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Maybe your volume measurements aren't accurate.


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Old 08-06-2012, 04:15 PM   #182
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I've recalibrated once already, but I don't mind doing it again. I think I'll take my hydrometer into my LHBS next time and see if it matches theirs. They make a lot of good beer on site.

Do I have the "conservation of sugar" formula right?



 
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Old 08-07-2012, 04:55 PM   #183
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cant you just put the hydrometer in water... shouldnt it read 1?

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Old 08-07-2012, 06:15 PM   #184
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Quote:
Originally Posted by golbin View Post
cant you just put the hydrometer in water... shouldnt it read 1?

brewon
In distilled water.
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Old 08-07-2012, 10:55 PM   #185
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It checks out in water.

But are my calculations solid? If I start at 1.050 and 7.75 gal preboil (387.5 pts) shouldn't I end up at 1.062 and 6.25 gal post-boil? I want to confirm the math while I look at calibrations.

 
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Old 08-07-2012, 11:49 PM   #186
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Quote:
Originally Posted by Viejo
It checks out in water.

But are my calculations solid? If I start at 1.050 and 7.75 gal preboil (387.5 pts) shouldn't I end up at 1.062 and 6.25 gal post-boil? I want to confirm the math while I look at calibrations.
The math is correct, though it's a small enough margin of error that it is easily attributable to measurement errors. That's why people are keying in on that.
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Old 08-07-2012, 11:54 PM   #187
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Good. I'll fine tune everything. Maybe I'm not too far off. Just looking for predictability.

 
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Old 08-10-2012, 12:53 AM   #188
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Quote:
Originally Posted by Viejo View Post
If the sugar content in the wort is constant, and the density is a function of wort volume, is there something wrong with my math, or are my water or hydrometer calibrations out of whack?
Another possibility, did you stir the wort thoroughly before taking your sample? If not that could explain why the sample read lower than expected.

 
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Old 08-10-2012, 01:27 AM   #189
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Yeah, pretty well. The final runnings read 1.025, and the preboil gravity was 1.050, so I think it was stirred pretty well.

 
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Old 08-20-2012, 07:58 PM   #190
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I've been trying to fix my efficiency problems for a while now. I normally get 60-65% with grain milled at my LHBS. This time, I took those milled grains and used a friend's mill set fairly small (don't know the gap size). Here's the grain bill I used for this recent recipe...

Code:
11 lbs 	Pale Malt (2 Row) US
2 lbs 	Munich Malt
1 lbs 	Caramel/Crystal Malt - 40L
8.0 oz 	Chocolate Malt
6.0 oz 	Acid Malt
4.0 oz 	Midnight Wheat
I mashed with 5.75 gal of water at 164.9 F (153F mash temp) and sparged with 4.15gal of 180.0 F water.

1st runnings: 4gal, 1.074
2nd runnings: 4gal, 1.032
Pre-boil: 8gal, 1.054

Using Kaiser's efficiency brewsheets, I noticed that on this batch I got 91.6% conversion effiency (way higher than usual).

After everything was finished, I added 5 gal cold water to the mash tun, stirred and drained. From that, I got 1.020 wort. The spreadsheet says this is a 68% lauter efficiency.

Is that a normal lauter efficiency for batch sparging with a 10gal Igloo cooler?



 
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