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Old 05-14-2011, 11:57 PM   #21
neldred
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Is trub loss generally the same regardless of 1, 2.5, or 5 gallon batches? Will trub amount effect ABV or Gravity, since its actually a solid (or are you precalculating in beersmith to compensate for trub)? Thanks...just getting back into brewing after taking a year break.

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Old 05-15-2011, 07:27 PM   #22
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I boil off almost 2 gallons in an hour. I figure on almost 8 gallons into kettle, 6 after the boil, 5.5 into fermenter, and 5 into bottling bucket.

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Old 07-12-2011, 01:26 AM   #23
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I have an automatic brewery that I've been using for 7 batches now. It is all enclosed in a attempt to retain heat during the mash, and to not get my basement all steamy when I brew (all electric). I have a duct fan that vents out the window. This time I started with 6.5 gallons before the boil, and after 60 minutes I was shocked to find I had lost 3 gallons! My OG was 1.080 and I didn't have a yeast starter ready. I have a bad feeling about this batch.

The difference between this batch and the previous 6 is that I took the lid off of the boiler for the entire boil. Before I would leave it on, but off to the side a bit so about ~30% of the boiler was uncovered. I don't know if the vent fan increases the evaporation rate when I have no cover on the boiler but I'm going back to covering it to avoid disasters such as this (I presume it will be a disaster, but I'll have to wait until I drink it to make sure).

Moral of the story: If you have an enclosed brewery contraption with a duct fan attached, don't boil without a lid :-)

Maybe I'll try again without the lid, but not boil so vigorously and leave the duct fan off.

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Old 07-12-2011, 07:26 AM   #24
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Why don't you add water to your fermenter to dilute closer to your intended OG?

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Old 07-12-2011, 11:49 AM   #25
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Good god, why didn't I think of that? Thanks!

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Old 05-11-2012, 04:13 AM   #26
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Quote:
Originally Posted by cswank View Post
Good god, why didn't I think of that? Thanks!
You should leave the lid off to allow dms to evap, but get a less powerfull fan. Imho.
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Old 05-11-2012, 04:06 PM   #27
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I have a 15 gallon stainless and my loss is a bit over 2 gal per hour.

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Old 05-11-2012, 04:19 PM   #28
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Quote:
Originally Posted by cswank View Post
I have an automatic brewery that I've been using for 7 batches now. It is all enclosed in a attempt to retain heat during the mash, and to not get my basement all steamy when I brew (all electric). I have a duct fan that vents out the window. This time I started with 6.5 gallons before the boil, and after 60 minutes I was shocked to find I had lost 3 gallons! My OG was 1.080 and I didn't have a yeast starter ready. I have a bad feeling about this batch.

The difference between this batch and the previous 6 is that I took the lid off of the boiler for the entire boil. Before I would leave it on, but off to the side a bit so about ~30% of the boiler was uncovered. I don't know if the vent fan increases the evaporation rate when I have no cover on the boiler but I'm going back to covering it to avoid disasters such as this (I presume it will be a disaster, but I'll have to wait until I drink it to make sure).

Moral of the story: If you have an enclosed brewery contraption with a duct fan attached, don't boil without a lid :-)

Maybe I'll try again without the lid, but not boil so vigorously and leave the duct fan off.
Don't forget that completely covering it traps the Dimethyl Sulfide instead of letting it boil out of the wort...
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Old 05-11-2012, 04:24 PM   #29
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It's different for everyone and depends on many factors, including kettle diameter, boil strength, altitude, etc.

I lose 0.80 gallons per hour under a vigorous boil. For my partial mash process, I only lose about 0.20 gal to trub. So that makes things easy calculations wise

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Old 05-11-2012, 06:04 PM   #30
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I was losing 0.9 gallon/hour in my 7 gallon aluminum turkey fryer. When I switched to a 15 gallon SS kettle, I started losing 1.75 gallon/hr. It just depends on your equipment.

I did a test run with plain water to measure my boil off. Then, I check it every time I brew to dial into an average.

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