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Old 01-27-2011, 12:15 AM   #1
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Default All Grain/PM Over thinking??

I have a couple years of Extract brewing under my belt to include a couple PM's. I have always done a 3gallon boil and use BeerSmith to work out my recipes. I now have a nice new 10gal pot, immersion chiller, and my trusty 5gal mash tun that I used for my PM's. So here is my question:
In Beersmith doing a 3 gallon 60min boil, 5gal final volume(top off) the IBU's are calculated. Now if I go all grain or even a PM and my final volume will be 5 gal but my starting boil volume could be up to 6-7 gallons. What volume do you use in BeerSmith so that the bitterness gets calculated correctly. The volume of runnings at the start of the boil I assume??? I want to make sure any new AG or PM brews come out tasting as good and as balance as my 3gal boil extract brews.

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Old 01-27-2011, 12:40 AM   #2
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The volume you put into the box in the upper left corner area above the recipe details is the volume you want going into the fermenter. I use 5.5 gallons, so that if I lose 1/2 gallon to fermenter trub I have a final 5 gallons packaged.

Under the equipment tab you can enter how much you anticipate losing to kettle trub, the boil off rate (it's in %/hour), amount lost in the lauter tun, volume change due to cooling (4%), etc. So Beersmith will calculate your pre-boil volume for you based on what values you enter (that'll typically be in the 7.5 to 8 gal range for me), and will use that pre-boil volume to do the IBU calculations.
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