SG too High

[joegbeer]

In distilled 64 degree distilled water, my hydrometer read 1.001. The recipe estimate for SG was 1.064. Measuring 68 degree wort, the reading was 1.074. Adjusting for temperature adds 0.001. Adjusting for hydrometer miscalibration subtracts 0.001. So the adjustments are a push.

Grains were steeped for 30 minutes. When adding the liquid malts, I removed the pot from the burner so I wouldn't scorch them. Stirred well before returned to burner to start the boil. Final volume might have been just an 1/8 of an inch below of the 5 gallon mark on my fermenter. When I added the 2 gallons of top-off water to the fermenter, I vigorously stirred the wort for about 2 minutes. How am I over starting gravity by so much?


Recipe: Cocoa Porter
Style: Robust Porter
TYPE: Extract

Recipe Specifications
--------------------------
Boil Size: 3.00 gal
Post Boil Volume: 2.78 gal
Batch Size (fermenter): 5.00 gal
Bottling Volume: 4.60 gal
Estimated OG: 1.064 SG
Estimated Color: 33.2 SRM
Estimated IBU: 37.3 IBUs
Brewhouse Efficiency: 72.00 %
Est Mash Efficiency: 0.0 %
Boil Time: 60 Minutes

Ingredients:
------------
Amt Name Type # %/IBU
1 lbs Caramel/Crystal Malt - 60L (60.0 SRM) Grain 1 9.3 %
8.0 oz Chocolate Wheat Malt (400.0 SRM) Grain 2 4.7 %
4.0 oz Black (Patent) Malt (500.0 SRM) Grain 3 2.3 %
4.0 oz Chocolate Malt (350.0 SRM) Grain 4 2.3 %
1 lbs 12.0 oz DME Golden Light (Briess) (4.0 SRM) Dry Extract 5 16.3 %
6 lbs 8.0 oz LME Golden Light (Briess) (4.0 SRM) Extract 6 60.5 %
8.0 oz Milk Sugar (Lactose) (0.0 SRM) - Boil 5 min Sugar 7 4.7 %
1.00 oz BSG Nugget [15.50 %] - Boil 60.0 min Hop 8 26.4 IBUs
2.00 oz Brewcraft US Tettnang [6.40 %] - Boil 15 Hop 9 10.8 IBUs
1.00 Items Whirlfloc Tablet (Boil 10.0 mins) Fining 10 -
2.0 pkg Safale American (DCL/Fermentis #US-05) Yeast 11 -

 

[RM-MN]

You are over the gravity by so much because even though you stirred vigorously for 2 minutes, you didn't get even mixing of the concentrated wort and top off water. It's incredibly difficult to get good mixing but since you are using extract with a known amount of sugar, if your volume measurement is correct, you can simply calculate the OG or if you use a kit, use the OG that the kit specified.