l3lackEyedAngels
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Papazian's The Complete Joy of Home Brewing provides a formula for speise (gyle) that assumes a priming rate of 3/4 cup of corn sugar per 5 gallons. Snyder's The Brewmaster's Bible provides a table which assumes a five gallon batch. Neither source takes into account the residual carbonation from fermentation. BeerSmith2 does, but you can only choose from corn sugar, DME, or honey. It doesn't have a speise option. Can I possibly use the amount that BeerSmith2 gives me for DME to calculate the amount of speise that I need? I figured that I could do it this way:
If BeerSmith2 tells me that I need 0.416 pounds of DME for priming and it thinks that DME has a yield of 44ppg, then I need 18.3 gravity points to prime my beer (0.416lb*44pts/lb). I have 5.19 gallons of beer with an original gravity of 1.076, which corresponds to 76 pts/gal. 18.3 points divided by 76 pts/gal. equals 0.24 gallons of speise. In other words, a quarter gallon of unfermended wort with a specific gravity of 1.076 will prime my beer the same way as 0.416 pounds of DME. Right? Have I gone wrong on assumptions or calculations anywhere?
If BeerSmith2 tells me that I need 0.416 pounds of DME for priming and it thinks that DME has a yield of 44ppg, then I need 18.3 gravity points to prime my beer (0.416lb*44pts/lb). I have 5.19 gallons of beer with an original gravity of 1.076, which corresponds to 76 pts/gal. 18.3 points divided by 76 pts/gal. equals 0.24 gallons of speise. In other words, a quarter gallon of unfermended wort with a specific gravity of 1.076 will prime my beer the same way as 0.416 pounds of DME. Right? Have I gone wrong on assumptions or calculations anywhere?