Author Topic: Lower brewhouse efficiency  (Read 1163 times)

Offline hazefodaze29

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Lower brewhouse efficiency
« on: December 10, 2016, 09:47:36 PM »
Hey everyone,

So I had what was a relatively uneventful brew day (or so I thought) until I checked my gravity prior to pitching yeast. I was expecting something around 1.066 or a little higher. Instead, I got 1.059. Here is the break down of how it all went.

Grains
12lbs 2 row
1lbs flaked oats
1lbs flaked wheat
.5lbs Crystal 40

Mashed at 154 with 4.75 gallons of water (water temp 170 degrees)
Fly sparged 6.50 gallons ( water temp 170-ish degrees)

Added a total of 7 ounces between boil/flameout/whirlpool
Boil volume at start was around 8.1 gallons.
Ended up with 5 gallons in the fermenter.

Its funny because this is my 4th all grain batch and my very first one over the summer was only off by 2 gravity points going into fermentation. Any and all help/advice/suggestions are greatly appreciated. For all 4 batches I have fly sparged. I may take a stab at a gose in a couple weeks... at least those are supposed to be lower ABV! Thank you in advanced.

Offline chinaski

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Re: Lower brewhouse efficiency
« Reply #1 on: December 10, 2016, 10:24:54 PM »
Most likely culprit is grain milling.  If you don't own a mill, then inconsistency in the crush might explain it.
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Offline beersk

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Re: Lower brewhouse efficiency
« Reply #2 on: December 10, 2016, 10:55:24 PM »
Sounds like you boiled off a ridiculous amount unless you left like 2 gallons behind in the kettle. Something isn't right there. If there was a bunch left then I'd say you over sparged and that watered down your wort and that's why your gravity was low.
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Offline hazefodaze29

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Re: Lower brewhouse efficiency
« Reply #3 on: December 11, 2016, 01:59:14 PM »
I mill at my lhbs. However, will be getting my own mill just in time for christmas. As for the volume numbers, I do agree it needs to be looked at. My preboil gravity was off by I believe 3 or 4 points. I didn't think that number would become greater as wort would be boiled off? I am trying to dial in exact volume numbers as I upgraded to a 10 gal kettle recently. I feel like every calculator gives you a different number when it comes to strike water and sparge water (volumes).

Offline a10t2

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Re: Lower brewhouse efficiency
« Reply #4 on: December 11, 2016, 03:10:30 PM »
What was the pre-boil gravity? Yes, it will increase throughout the boil as water evaporates. What was the post-boil volume?
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Offline lenphallock

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Lower brewhouse efficiency
« Reply #5 on: December 11, 2016, 03:20:59 PM »
I would measure what you are leaving behind in the kettle. I leave extra behind in my kettle for the sake of clearer wort in the FV. I throw pellet hops in the boil loose and collect around 8.5 gallons pre boil. I will do a little more or less depending on hopping amount. I end up with 6 gallons in FV after 90 minute boil. I leave about a gallon sludge in the kettle. Hope that helps. 


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Offline hazefodaze29

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Re: Lower brewhouse efficiency
« Reply #6 on: December 12, 2016, 10:37:46 PM »
Pre boil gravity was around 1.050
Gravity going into the fermentor was 1.059
Preboil volume was around 8.1 gallons and I ended with 5 gallons going in the bucket. I left behind a good slurry of hops at the end of the kettle. The boil was for 70 minutes. I usually boil for 60, but once I realized my preboil gravity was off, I thought I would try to compensate by boiling for 10 more minutes.

Offline a10t2

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Re: Lower brewhouse efficiency
« Reply #7 on: December 13, 2016, 05:50:40 PM »
Pre boil gravity was around 1.050
Gravity going into the fermentor was 1.059
Preboil volume was around 8.1 gallons

Assuming those numbers are correct, your post-boil volume was ~6.9 gal, and the problem is simply starting with too much wort in the kettle. If the recipe you're brewing is based on a 5 gal volume, then you need to start with ~6.2 gal to boil down to that (based on 1.2 gal boiloff for this batch).
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Re: Lower brewhouse efficiency
« Reply #8 on: December 13, 2016, 06:27:57 PM »
Pre boil gravity was around 1.050
Gravity going into the fermentor was 1.059
Preboil volume was around 8.1 gallons

Assuming those numbers are correct, your post-boil volume was ~6.9 gal, and the problem is simply starting with too much wort in the kettle. If the recipe you're brewing is based on a 5 gal volume, then you need to start with ~6.2 gal to boil down to that (based on 1.2 gal boiloff for this batch).

Which will lower your efficiency by collecting less wort.  Round and round we go....
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Offline a10t2

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Re: Lower brewhouse efficiency
« Reply #9 on: December 13, 2016, 06:45:47 PM »
Which will lower your efficiency by collecting less wort.  Round and round we go....

True, but probably not by a significant amount on a moderate-gravity beer.
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Re: Lower brewhouse efficiency
« Reply #10 on: December 13, 2016, 07:15:05 PM »
Which will lower your efficiency by collecting less wort.  Round and round we go....

True, but probably not by a significant amount on a moderate-gravity beer.

Indeed
Life begins at 60.....1.060, that is!

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