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Old 09-18-2008, 10:11 PM   #1
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Default First Partial Mash. REALLY high OG.

I did my first Partial Mash last night.
It's a Brooklyn Brown ale clone recipe I got from my LHBS.

The expected OG is about 1.060-1.063
The measured OG is 1.087 !

I am not using a mash tun. What I am doing is doughing in the malt into a pot of water at 155 degrees that I have in the oven (also set to 155 degrees, and verified with a thermometer). I let it soak in there for 90 minutes, then after 90 minutes (checking and maintaining the temp the whole time) I take the pot out and pour it throguh a sanitized SS colander into my brew pot.

After that, I use a measuring cup and slowly pour 155degree water over the mash to sparge the grain.

I followed the recipe usign the necessary amounts of DME, MaltoDextrin, etc.

I am wondering, am I getting really good starch conversion or am I getting other stuff out of the grain that might give me off flavors, or what?

Thanks!

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Old 09-18-2008, 10:31 PM   #3
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What she said ^^^.

Also, 168-170 is usually the preferred sparge water temp, you were a bit low at 155.

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Old 09-19-2008, 12:37 AM   #4
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here is the recipe I used:
this is a 5 gallon batch.

1.75 lbs 2 row Pale Malt
12 oz Crystal Malt 60 Lovibond
5 oz British Chocolate Malt
3 oz Belgian Biscuit Malt.
4.5lbs extra light DME
8oz Wheat DME
4 oz MaltoDextrin
1oz Northern Brewer Pellet Hops @ 8.6 AA
1/2 OZ Willamette Hops
3/4 oz Cascade hops

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Old 09-19-2008, 01:50 AM   #5
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I think you need to check your hydrometer because there is No Way you could get 27 ppg more with That recipe unless you were doing a Very small batch and a brewhouse efficiency of 85% which would be possible... like 3.75 gallons maybe? Did you start out boiling 5 gallons and end up with 3.75 gallons?

Stats
OG 1.082
FG 1.021
IBU 33
ABV 7.9 %


Specifics
Boil Volume 3.75 gallons
Batch Size 3.75 gallons
Yeast 75% AA

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Old 09-19-2008, 03:27 AM   #6
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Running the numbers, your OG is impossible to achieve without more ingredients or less water. You would have to get 180% effeciency, which is obviously impossible.

I would probably guess, that because of the low sparge temp, that you got an efficency somewhere between 60%-70%. This would equate to an OG of 1.059-1.061, right in line with what you should have gotten.

How and when did you measure the gravity? Pre boil/post boil, what temp, volume, etc...?


Edit: My %'s were on backwards.

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Old 09-19-2008, 06:08 AM   #7
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Quote:
Originally Posted by BarleyWater View Post
Running the numbers, your OG is impossible to achieve without more ingredients or less water. You would have to get %180 effeciency, which is obviously impossible.

I would probably guess, that because of the low sparge temp, that you got an efficency somewhere between %60-%70. This would equate to an OG of 1.059-1.061, right in line with what you should have gotten.

How and when did you measure the gravity? Pre boil/post boil, what temp, volume, etc...?
Again why I am posting here. As I am confused.

I used a hydrometer and I measured after I had cooled the wort to yeast pitching temp, just before I pitched the yeast. Temp was 70 degrees F. Volume was 5.15 gallons.
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Old 09-19-2008, 08:39 AM   #8
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Is it possible you got some layering with your sample?
Did you stir, shake, airate your wort before drawing the sample?
Remembered an old post, is it possible someone poured around 2 lbs of salt into it just to pi.. you off?

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Old 09-19-2008, 04:22 PM   #9
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Quote:
Originally Posted by Kauai_Kahuna View Post
Is it possible you got some layering with your sample?
Did you stir, shake, airate your wort before drawing the sample?
Remembered an old post, is it possible someone poured around 2 lbs of salt into it just to pi.. you off?
That is a distinct possibility.
I usually shake the wort to aerate it. I am thinking about getting a fish tank pump and aeration stone to assist with Aeration.

Nobody poured salt in it. I was alone in my apartment when I brewed.

Unless the sweet black labrador retriever is using subterfuge to mask her evil nature...
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Old 09-19-2008, 09:05 PM   #10
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Quote:
Originally Posted by SeldomSeen View Post
Again why I am posting here. As I am confused.

I used a hydrometer and I measured after I had cooled the wort to yeast pitching temp, just before I pitched the yeast. Temp was 70 degrees F. Volume was 5.15 gallons.
Did you correct for the temperature? Hydrometers are calibrated to 60 deg. F...
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