barleyhole
Well-Known Member
I brewed a Porter - I'll spare the grain bill details but I was shooting for an OG at 1.080.
I got done with my batch sparge and hit a preboil volume of 7.5 gal at 1.060. So I was pretty pleased as the grain bill was calculated assuming 80% efficiency and that was about 82%. So I boiled down to 5.25 gal and should have ended up with a gravity a little above 1.080 - BUT I ended up with 1.070!
I checked calibration of the hydrometer and thermometer...no issues. I thought that one constant through out the brewing process was total gravity units - gravity units x volume = constant. I've checked and rechecked and cannot figure out the source for the error, but I can only think that something must have been off in the preboil check. Anyone have ideas?
I got done with my batch sparge and hit a preboil volume of 7.5 gal at 1.060. So I was pretty pleased as the grain bill was calculated assuming 80% efficiency and that was about 82%. So I boiled down to 5.25 gal and should have ended up with a gravity a little above 1.080 - BUT I ended up with 1.070!
I checked calibration of the hydrometer and thermometer...no issues. I thought that one constant through out the brewing process was total gravity units - gravity units x volume = constant. I've checked and rechecked and cannot figure out the source for the error, but I can only think that something must have been off in the preboil check. Anyone have ideas?