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-   -   pre/post boil gravity question (http://www.homebrewtalk.com/f36/pre-post-boil-gravity-question-372503/)

kpot2004 12-07-2012 02:58 AM

pre/post boil gravity question
 
Brewed a oatmeal stout today with a target of of 1.064. Stopped fly sparging when I had 6.5 gallons pre-boil. Pre-boil gravity reading was 1.048. Boiled 65 minutes and ended up with almost exactly 5 gallons. My OG ended up being 1.070. Something doesn't seem right here.. 6.5x48 = 312/5 = 1.062, how did I end up with 1.070?

emprbasist 12-07-2012 05:04 AM

Were you taking gravity readings with a refractometer or a hydrometer? If hydrometer, did you take both readings at room temp or close?

kpot2004 12-07-2012 06:14 PM

Quote:

Originally Posted by emprbasist (Post 4658403)
Were you taking gravity readings with a refractometer or a hydrometer? If hydrometer, did you take both readings at room temp or close?

Gravity readings were taken with a hydrometer. Pre-boil reading was temp corrected, post-boil reading was taken when wort had cooled to 65.

helibrewer 12-07-2012 06:34 PM

Volume measurement errors?

kpot2004 12-07-2012 06:53 PM

Quote:

Originally Posted by helibrewer (Post 4659985)
Volume measurement errors?

I have a wooden dowel that I use so I get exactly 6.5 gallons pre-boil, and I used the gallon markings on the bucket and ended up almost right to the 5 gallon line, maybe like 4.8-4.9 gallons.

mcl 12-07-2012 07:59 PM

Quote:

Gravity readings were taken with a hydrometer. Pre-boil reading was temp corrected, post-boil reading was taken when wort had cooled to 65.
This is why. You can throw the temp corrections out the window if they get too far above the calibration point.


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