OG as it relates to water volumes

[CAustin919]

I've brewed about 10 extract batches... this is my first go at a partial mash. Also my first time using BeerSmith.

Why do I feel like something is wrong here? In terms of this being a partial boil... ending up with 3.13 gallons post boil. Then adding water to the fermenter to arrive at 5 gallons. Estimated post boil gravity is 1.068.

So when I top off the carboy to 5 gallons is that going to dillute the gravity? Or has that already been accounted for based on batch size?

I guess I should have chose to do my first partial mash OR first recipe using BeerSmith.. but not both at the same time.




BeerSmith 2 Recipe Printout - http://www.beersmith.com
Recipe: Two Hearted Sorta-Clone
Brewer: C. Austin
Asst Brewer:
Style: American IPA
TYPE: Partial Mash
Taste: (30.0)

Recipe Specifications
--------------------------
Boil Size: 3.50 gal
Post Boil Volume: 3.13 gal
Batch Size (fermenter): 5.00 gal
Bottling Volume: 4.60 gal
Estimated OG: 1.068 SG
Estimated Color: 8.4 SRM
Estimated IBU: 55.1 IBUs
Brewhouse Efficiency: 72.00 %
Est Mash Efficiency: 72.0 %
Boil Time: 60 Minutes

Ingredients:
------------
Amt Name Type # %/IBU
2 lbs Vienna Malt (3.5 SRM) Grain 1 20.5 %
1 lbs 4.0 oz Caramel/Crystal Malt - 10L (10.0 SRM) Grain 2 12.8 %
1 lbs Pale Malt (2 Row) US (2.0 SRM) Grain 3 10.3 %
8.0 oz Cara-Pils/Dextrine (2.0 SRM) Grain 4 5.1 %
5 lbs Light Dry Extract [Boil for 60 min](8.0 Dry Extract 5 51.3 %
1.00 oz Centennial [8.70 %] - Boil 60.0 min Hop 6 21.6 IBUs
1.00 oz Centennial [8.70 %] - Boil 45.0 min Hop 7 19.8 IBUs
0.50 oz Centennial [8.70 %] - Boil 30.0 min Hop 8 8.3 IBUs
1.00 Items Whirlfloc Tablet (Boil 15.0 mins) Fining 9 -
0.50 oz Centennial [8.70 %] - Boil 15.0 min Hop 10 5.4 IBUs
0.50 oz Centennial [8.70 %] - Boil 0.0 min Hop 11 0.0 IBUs
1.0 pkg American Ale II (Wyeast Labs #1272) [124 Yeast 12 -
2.00 oz Centennial [8.70 %] - Dry Hop 5.0 Days Hop 13 0.0 IBUs


Mash Schedule: BIAB, Light Body
Total Grain Weight: 9 lbs 12.0 oz
----------------------------
Name Description Step Temperat Step Time
Saccharification Add 15.39 qt of water and heat to 152.0 152.0 F 90 min
Mash Out Heat to 168.0 F over 7 min 168.0 F 10 min

Sparge: Remove grains, and prepare to boil wort
Notes:
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Created with BeerSmith 2 - http://www.beersmith.com
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[benbradford]

The post boil should be including the top up water in the fermenter... Sanitze a beer theif(turkey baster) and pull a sample from the fermenter and you should be really close due to the use of extracts... Efficiency(being higher or lower than predicted) is something you will get into when you get to all grain.