Brew Files Podcast Ep. 41 - Parti In My Pots

General Homebrew Discussion
1

https://www.experimentalbrew.com/podcast/brew-files-episode-41-parti-my-pots

We like to Brew. We like to Party. We like to Parti… . This week we’re going to dive into an old fashioned technique that allows you to brew beautifully strong beers without wasting any left over malty goodness! Two Beers for the Price of One Mash

Parti-Gyle Equations:
        Gravity Points batch 1 = Gravity PointsTotal × SugarPercentage1 / (Volume Batch 1)
        Gravity Points batch 2 = Gravity PointsTotal × SugarPercentage2 / (Volume Batch 2)

Sugar Percentages for 1/3-2/3rd Splits (e.g. 5gallons/10gallons)
            SugarPercentage1 = 0.67
            SugarPercentage2 = 0.33

Sugar Percentages for 1/2-1/2 Splits (e.g. 5gallons/5gallons)
            SugarPercentage1 = 0.58
            SugarPercentage2 = 0.42

To figure out what the “Total Batch” gravity needs to be from a desired Batch 1 gravity

Gravity PointsTotal = (Gravity Points Batch 1 x Volume Batch 1)/(TotalVolume x SugarPercentage1)

2

I found this explanation on another forum and used it just a few weeks ago on my first partigyle attempt. It seemed to work as described. Could be that both are saying the same thing but I understood this one much better than similar formulas to the one that Denny posted.

If you want to do a 50/50 split Partigyle take the decimal part of the strongest beer’s OG and divide by 2. Then subtract that from the OG. Let’s say you want the 1st beer’s OG to be 1.088. The second beer’s OG is (.088/2)=1.044
to calculate the full 10 gallons OG add the two OG’s & divide by 2. (1.088+1.044)/2 = 1.066. Use 1.066 for your target OG for a 10 gallon batch.