Posted By: Julia Taylor
As the clock hit midnight and ushered in 2011, I resolved to reduce my carbon footprint in the new year and figured I start by applying the three Rs to brewing. Our weekend brew schedule included a Big Red Ale with an estimated ABV of 7.5-8%, so thought this was the perfect time to introduce a parti-gyle into the brew day. Parti-gyle is the English name of the traditional procedure of mashing grains with two (or even three) infusions of water, resulting in successively weaker beers. Each beer is run off to its own pot, or gyle, so is a great way to get different beers from one mash. Because the first runnings are strong with high sugar concentration, this method is particularly useful where one beer is strong and the other is weaker. Parti-gyle brewing is no more difficult than regular all-grain brewing, but does require a bit of figuring and calculating beforehand or on the fly if you want to hit gravities perfectly, but don’t let that stop your creativity.

This process requires that both beers have similar malt characteristics, so I planned an amber, similar to New Belgium’s Fat Tire, to complement the Big Red. After you run off the strong beer, you can also “cap” the mash. This is adding crystal, roasted, and toasted grains to the mash before putting in the strike water for the 2nd beer. There isn’t a standard calculation to determine how capping will affect the OG so focus on the taste characteristics and color. Since each beer goes into its own pot, you still have the freedom to vary the hop profile and yeast since boiling and fermentation are done separately. Here are some ideas for different mashes to yield strong / mild beers:
The first step in building your parti-gyle recipe is to determine your estimated original gravities. We determined that we wanted our big beer to come in around 7.5% and the second between 4.5-5% so we were looking for an approximate 1.075/1.045 split. Using Tom-O’s Parti-Gyle Cipherin’ Sheet we decided to go with an average (batch) original gravity of 1.065 (1.0780/1.0520 split).The average preboil OG was 1.0553 @14 gallons and this is the information that is plugged into Beer Smith or desired brewing software to determine the grainbill. Once you finalize your recipe enter the SRM into the parti-gyle spreadsheet and it will give you the color split for each beer. At this point you can determine if you want to cap the mash for additional color or flavor.
We know that our total grain bill is 28.75 lbs., water-to-grain ratio is 1.25 qt./lb., preboil volume is 14 gallons (from spreadsheet), and absorption amount is .2 so we can figure out the amount of water we will need for the initial strike and sparge.
To determine the strike water, multiply the grain bill by the water-to-grist ratio and divide by four to get the amount in gallons.
(28.75 * 1.25)/4=9 gallons of strike water
For the sparge water, add the total preboil volume and absorption amount minus strike amount.
(14+(28.75*.2)-9=10.75 gallons
Mash at the desired temperature and time, then completely drain the wort from the mash tun into the first boilpot (first runnings). Refill the mash tun with sparge water, and stir. Recirculate the mash and drain into the second pot (second runnings). You now have two boil kettles with two distinct beers so have fun with your hop and yeast selections.

Recipe
Grain Bill
Mash @ 154 F
22.50 lb Pale Malt (2 Row) US
1.25 lb Caramel/Crystal Malt – 40L
1.25 lb Caramel/Crystal Malt – 60L
1.25 lb Caramel/Crystal Malt – 80L
1.25 lb Caramunich Malt
1.25 lb Munich Malt
0.20 lb Chocolate Malt
Big Red (First Runnings)
OG-1.077 FG-1.019 IBU-25.4 ABV-7.6%
Boil-60 minutes Pre-Boil Volume-7 gallons
0.50 oz Warrior @ 60 min
0.50 oz Warrior @ 10 min
0.50 oz Warrior @ 0 min
1.00 oz Warrior-Dry Hop 14 days
American Ale Yeast II (Wyeast Labs #1272)
Red Light (Second Runnings)
OG-1.052 FG-1.013 IBU-23.3 ABV-5%
8 oz. Cara Amber Malt
2 oz. Chocolate Malt
Boil-60 minutes Pre-Boil Volume-7 gallons
1.00 oz Cascade @ 60 min
1.00 oz East Kent Goldings @ 20 min
1.00 oz East Kent Goldings @ 0 min
Safale-US-05-I packet
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