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No Sparge/Partigyle
Last month I brewed Russian Imperial Stout. I planned a big mash and then ran the first running into the kettle and brewed that up. Then I put the spurge water in, ran that off, and brewed a second beer.
When taking the first 5 gallons, you don't use any spurge water. That's called "[google]no spurge brewing[/google]". (Clever name, huh?) That's then where someone would usually dump out their mash- which is very wasteful since there's still sugar in the mash. Running additional water through the mash and collecting a second beer with the remaining sugar is called "[google]Partigyle brewing[/google]."
That's all well & good and certainly nothing new. But how do you calculate such a batch? That's the trouble I've been facing, but I think I have the answer now.
When you do a no spurge brew, you collect roughly 2/3rds of the sugar that you normally get with your given efficiency. When you runoff your second beer, you'll get the other 1/3rd.
So, if your efficiency is usually 70% (a pretty common number for most homebrewers), 2/3rds will roughly be 45% and 1/3 is 25%.
(If your effect is usually 80%, you want 52% and 28%)
1. Thanks... That's timely and helpful for me since I was scratching my head a week or two ago trying to figure out this very thing. One of the next brews I do I'll be following this same process. Unfortunately I'll miss the one on 6/23 since I'll be in France, but some time July I'll give it an attempt.
Question though... I do a continuous spurge with my system, so is there any reason why I'd do a "no spurge" first? I was assuming I'd just start my normal sparing process and just run the first 6 gallons or so into one kettle, and then the rest into another. In theory this would produce the same results, right?
So I made an attempt at parity brewing this weekend, and overall it was pretty successful. I ended up making a barley wine and pale ale. Coming up with the recipes was kind of a pain since I had to make three in the end... One for the base mash I used for both, and then one each for the two beers with there hop schedules, etc. I used the chart from the link Growler provided and it seemed accurate. According to the chart, targeting 1.0750 should provide 5 gallons of 1.1125 and 10 of 1.0563. I ended up with 5 of 1.105 and 10 of 1.062. Those numbers probably aren't 100% accurate since they are the final readings when I pitched, but close enough. The whole process was pretty easy, and the only really bad part had to clean two kettles at the end. I just did my usual continuous spurge, running the first 7 gallons into the smaller kettle, and then 14 or so into the larger one. End result... 5 gallons of a really big beer I can age for a while, and 10 of what should be a good session beer.
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