pre boil og too low?

[rick79]

My first attemp at all grain, and according to the recepie my pre boil og is too low at 1.030. I was told it should be at 1.054. not sure what to do going forward.

 

[Hang Glider]

pre-boil will be lower - boiling drives rapid evaporation, condensing the liquid.

boiling 6.5 gallons in a 10 gallon pot will often lose a gallon and a half... although the quick math says 1.5 gallon boil off for full boil batch will get you closer to 1.040

was that a refractometer-converted reading or a hydrometer?
did you adjust for temperature?

 

[postalbunny]

What temp was your sample? You'll have to correct for the high temp if it was still 150 deg f. Thats more than double what the hydrometer is calibrated for.

 

[Hang Glider]

^

very true.

on a 60F hydrometer, 150F (near your mash temp) and 1.030 = 1.049
add in the boil-off volume, and you're closer to sitting at 1.064 at pitching time.




thanks to BeerSmith 2.0's boil-off tool and hydrometer tool

 

[rick79]

Thanks, i used a hydrometer and did not calculate for temperature. So according to the other replies i seem to be ok.

 

[rick79]

The sample temperature was at approx 140 deg.

 

[Hang Glider]

so... your batch is now in the fermenter - what was your final OG?

 

[rick79]

My final og was 1.042 @ approx 70 deg. Fermentation is under way.