I made this recipe with my BIAB setup yesterday. Here are my notes on the off chance someone might find them useful. I followed the recipe in the OP for a 5.5 gallon batch. The AA on my Cascade hops was only 6.0, so I decided to bump those additions up to 0.3oz. I used RO water with 2g of gypsum and 5g of CaCl (measure out 5.5g actual to account for the fact it absorbs moisture from the air) and 1.5mL 88% lactic acid.
Mill gap on my MM2-Pro - 0.022"
Strike volume: 8.2 gallons
Strike temp: 154.5F
I stirred for a minute after mashing in, and the mash temp was at 151.4F. Then I wrapped my kettle in a sleeping bag.
After 60 minutes the mash temp was 146F. Gravity 1.029 pH 5.45
After squeezing the bag gravity was 1.032 and I was left with 7.8 gallons of wort (at 142F)
After the 60 minute boil and 10 minutes to chill the wort to ~70F, I had 6.1 gallons in the fermenter with an OG of 1.039. I collected 5.5 gallons.
So conversion efficiency was a little low at 86%, probably because I didn't refire the burner and stir every 15 minutes like I usually do. I still ended up with a pre-boil gravity slightly higher than estimated. My boiloff rate was a little low. I was trying my new Blichmann Hellfire burner and it has some QC problems that prevented me from turning the regulator past 5-10%. I think with a better burner I would have hit the OG. I planned on having half a gallon of trub left, but since the hop bill on this recipe is pretty light, I think I'd start with 0.25 gallons less next time.
Mill gap on my MM2-Pro - 0.022"
Strike volume: 8.2 gallons
Strike temp: 154.5F
I stirred for a minute after mashing in, and the mash temp was at 151.4F. Then I wrapped my kettle in a sleeping bag.
After 60 minutes the mash temp was 146F. Gravity 1.029 pH 5.45
After squeezing the bag gravity was 1.032 and I was left with 7.8 gallons of wort (at 142F)
After the 60 minute boil and 10 minutes to chill the wort to ~70F, I had 6.1 gallons in the fermenter with an OG of 1.039. I collected 5.5 gallons.
So conversion efficiency was a little low at 86%, probably because I didn't refire the burner and stir every 15 minutes like I usually do. I still ended up with a pre-boil gravity slightly higher than estimated. My boiloff rate was a little low. I was trying my new Blichmann Hellfire burner and it has some QC problems that prevented me from turning the regulator past 5-10%. I think with a better burner I would have hit the OG. I planned on having half a gallon of trub left, but since the hop bill on this recipe is pretty light, I think I'd start with 0.25 gallons less next time.