# How do I calculate mash efficiency with BeerSmith2 when doing a partigyle?

I designed a barleywine in BeerSmith2, made it, plus I made another beer afterwords from the same grain. My mash efficiency on the first runnings turned out to be 75% (I put the grain bill and pre-boil 1.092 and 5.85 gallons into BeerSmith2 for that). I purposefully didn't mash-out so I could do the partigyle. I got 3.6 gallons of 1.034 wort out of the mash tun on the second runnings.

What I wanted to do was make a new recipe in BeerSmith2 (separate recipe for the partigyle) by duplicating the original grain bill and somehow adjusting the program so that it realized that 75% of the grain had already been accounted for, but I didn't know how to do this.

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Since you already have your wort, and know the volume and gravity, you don't need an accurate grain bill for that part, but just need to get the software to register 3.6 gallons of 1.034 wort. You can do it like this:

1. create a new recipe and set your desired batch size.
2. add 1 pound of base malt, e.g. pils malt.
3. Click "gravity" and enter 1.034 as the target gravity - the software will now increase the amount of grain you need.
4. Click "scale" and enter 3.6 gallons - the amount of grain will be scaled to give 3.6 gallons at 1.034. (Since we already set the batch size in step 1, the recipe is already to scale so this part can be skipped.)
5. If you want you can also approximate for color. Add 1 oz of black malt/roasted barley, then choose "color" and enter an estimate of your wort's color. Beersmith will scale the amount of the dark grain to approximate the color. It's usually a small amount compared to the base malt, so gravity remains unchanged.
6. To hit the SG you'll need to add top-up water to compensate for the boil-off - since the gravity units were computed using the post-boil target.

With the recipe emulating what you now have going into the kettle, you can then start to add adjuncts and hops to the recipe and and the additional gravity and IBUs will be computed correctly.

(PS: I'm using beersmith 1 - you can do the same with beersmith 2 by using the sliders for gravity and color) and presumably any other software that scales ingredients to give control over gravity, batch size and color.

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Thanks for the suggestion. Your method worked a little better than the one from JoeFish. Well, at least it was faster to get somewhat close to my actual values, but I still couldn't get close enough to my actuals for my liking. And I boiled my partigyle really hard, so had to put in a different equipment profile since you can't do that by recipe. – Dale Jan 18 '12 at 23:37
Glad to help. You're right about needing different equipment profiles for different boiloff rates if you want to set the boil volume automatically, although you can also choose to manually set the pre-boil volume if you know your boiloff rate. I'm surprised you only got somewhat close - you should be able to get the exact gravity, volume and color - do you know what was stopping you from achieving this? – mdma Jan 19 '12 at 9:23

The way I did it was to duplicate the recipe, adjust the volumes until the sparge volume on the first is 0 and the mash volume on the second is close to 0, then fiddle with the efficiency settings on the two until the estimated OG matched my measured OG. I think it ends up around 58%/25% efficiency for the first/second batches. Example recipe link here.

Obviously not the easiest way to do things, but I couldn't come up with a better way to do it.

Edit: also check out the Beersmith forums. I just did a search and there are several threads that talk about parti-gyle brewing.

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Thanks for the suggestion. I have my "real" numbers, but I was unable to get the program to match my actual volumes and SG readings using the "fiddle with efficiencies" method. I'm annoyed that there's no way to set how "hard" you boil by batch. BeerSmith2 seems backwards with accepting an efficiency as an input value...it should be a result. I'm not sure I'll buy this program. – Dale Jan 18 '12 at 23:33
It does take an efficiency value up front, but that's the expected brewhouse efficiency, so you can build the recipe based on your system. If you go to the Mash tab, you can enter actual numbers. – JoeFish Jan 18 '12 at 23:39