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Home Brew Forums > Home Brewing Beer > All Grain & Partial Mash Brewing > Final reading of fly sparging for high O.G.
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Old 03-13-2014, 05:43 PM   #1
Bob-MTL
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Default Final reading of fly sparging for high O.G.

I didn't know how to search for this info, so I went lazy and posted a new thread... 8P

Let's say I want to do a brew with an O.G. of 1.080 (or more), using a fly sparge. The first few drops will have a gravity that's a lot higher, let's say 1.100, and will slowly goes down.

Now, the writings goes into the "you stop at 1.010 or when you have your boil volume". If I stop at boil volume, can I expect to have a reading way above 1.010?

Cause if I do the math, the more sparge water I put into the mash, the less sugar I get, the less I get, the more I need to boil to get it (back) to 1.080.


Is this why you lose efficiency when you brew high O.G.? Because you stop before draining all the sugars?

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Old 03-13-2014, 06:27 PM   #2
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The answer is yes, you lose efficiency because you are not able to rinse all the sugars, otherwise if you did rinse until 1.010 you would have collected much more wort than you would need. Once you get to know your typical efficiency for an average beer, you can adjust your efficiency down and account for more grains. Another way is to collect more wort and boil off more water by doing a 90 minute boil. The last fly sparge I did for a 1.098 beer, I collected 7.0 gallons and noticed I only had 1.065 from my refractometer. For a 60 minute boil (1.5 gallon /hour evaporation rate) this would result in 1.083. I used this link to calculate
http://www.brewersfriend.com/dilutio...ty-calculator/

My runoff was still 1.040+ so I collected another gallon to get to 8 gallons and boiled off an additional gallon for 40 minutes before adding my bittering hops and usual 60 minute boil. This raised my post boil gravity to get closer to the recipe.
To hit your SG for "big" beers you really need to know your system, or be able to improvise (boil longer, add DME, etc...).

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Old 03-14-2014, 06:13 PM   #3
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You can also increase the efficiency of high gravity beers by slowing down the sparge rate.
For example, I mainly brew beers with an OG of 1.050 - 1.055. For these beers, I adjust my sparge rate so it takes approximately 1 hour to reach my pre-boil volume. If I brew a beer with an OG of 1.075, I could sparge at the same rate and accept a lower efficiency, or I could decrease the sparge rate so the sparge takes approximately 90 minutes. This would result in virtually no loss in efficiency. (These figures were based on a 5g MLT. With my current 10g MLT, I can reduce the sparge time by about 30% with no loss in efficiency at 1.055, but I haven't brewed anything much bigger than that in the new MLT.)

-a.

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Old 03-14-2014, 06:31 PM   #4
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Alright, thanks for the info.

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