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Extract to AG conversion IBU calculation?

Discussion in 'Recipes/Ingredients' started by khkman22, Nov 1, 2013.

 

  1. #1
    khkman22

    Active Member  

    Posted Nov 1, 2013
    I made the extract Falconer's Flight IPA from AHS last year. I just got BeerSmith 2 and did a conversion of that recipe to an AG recipe to see how the grain bill was estimated. The extract recipe I entered I to BeerSmith was pretty accurate as far as the ABV, which was right on or maybe off by .1%. I had previously calculated IBUs and calculated 67 which was right on BeerSmith's calculation. When I converted the recipe to AG, the ABV was still the same I believe, but the IBUs are calculated at about 95-97. What is causing this and how can I know that one of my created recipes would be correct?
     
  2. #2
    Pie_Man

    Well-Known Member

    Posted Nov 2, 2013
    I have no idea, but you might try inputting the recipe without using the conversion button. Basically the specialty malts stay the same and the base extract is replaced with base grain to equal the gravity points.

    Can you post the recipe and mash profile?

    Check your recipe's boil volume and batch volume in the all-grain recipe.

    Is it possible the bitterness formula changed (Rager, Tinseth, Garetz)?

    Also, double check that the hop names, AA%, quantities, and boil times remained the same. I doubt these changed, but it's worth making sure.
     
  3. #3
    khkman22

    Active Member  

    Posted Nov 3, 2013
    Here is what is in BeerSmith. I don't see any inconsistencies, but I've never done AG or created my own recipe.

    Extract

    BeerSmith 2 Recipe Printout - http://www.beersmith.com
    Recipe: AHS Falconer's Flight
    Brewer: Me
    Asst Brewer:
    Style: American IPA
    TYPE: Extract
    Taste: (30.0)

    Recipe Specifications
    --------------------------
    Boil Size: 3.67 gal
    Post Boil Volume: 3.38 gal
    Batch Size (fermenter): 5.25 gal
    Bottling Volume: 4.85 gal
    Estimated OG: 1.065 SG
    Estimated Color: 11.2 SRM
    Estimated IBU: 65.1 IBUs
    Brewhouse Efficiency: 72.00 %
    Est Mash Efficiency: 0.0 %
    Boil Time: 60 Minutes

    Ingredients:
    ------------
    Amt Name Type # %/IBU
    1 lbs Caramel/Crystal Malt - 40L (40.0 SRM) Grain 1 9.3 %
    8.0 oz Pale Malt (2 Row) US (2.0 SRM) Grain 2 4.7 %
    4.0 oz Wheat, Torrified (1.7 SRM) Grain 3 2.3 %
    1 lbs Extra Light Dry Extract (3.0 SRM) Dry Extract 4 9.3 %
    8 lbs Pale Liquid Extract (8.0 SRM) Extract 5 74.4 %
    2.00 oz Falconer's Flight [11.00 %] - Boil 60.0 Hop 6 45.6 IBUs
    1.00 oz Falconer's Flight [11.00 %] - Boil 20.0 Hop 7 13.8 IBUs
    0.50 oz Falconer's Flight [11.00 %] - Boil 15.0 Hop 8 5.7 IBUs
    2.0 pkg Safale American (DCL/Fermentis #US-05) Yeast 9 -
    1.50 oz Falconer's Flight [11.00 %] - Dry Hop 8. Hop 10 0.0 IBUs


    Mash Schedule: Single Infusion, Light Body, No Mash Out
    Total Grain Weight: 10 lbs 12.0 oz

    All Grain

    BeerSmith 2 Recipe Printout - http://www.beersmith.com
    Recipe: AHS Falconer's Flight AG Conversion
    Brewer: Me
    Asst Brewer:
    Style: American IPA
    TYPE: All Grain
    Taste: (30.0)

    Recipe Specifications
    --------------------------
    Boil Size: 6.78 gal
    Post Boil Volume: 6.24 gal
    Batch Size (fermenter): 5.25 gal
    Bottling Volume: 4.85 gal
    Estimated OG: 1.063 SG
    Estimated Color: 7.5 SRM
    Estimated IBU: 93.9 IBUs
    Brewhouse Efficiency: 72.00 %
    Est Mash Efficiency: 82.3 %
    Boil Time: 60 Minutes

    Ingredients:
    ------------
    Amt Name Type # %/IBU
    11 lbs 8.0 oz Pale Malt (2 Row) US (2.0 SRM) Grain 1 90.2 %
    1 lbs Caramel/Crystal Malt - 40L (40.0 SRM) Grain 2 7.8 %
    4.0 oz Wheat, Torrified (1.7 SRM) Grain 3 2.0 %
    2.00 oz Falconer's Flight [11.00 %] - Boil 60.0 Hop 4 65.8 IBUs
    1.00 oz Falconer's Flight [11.00 %] - Boil 20.0 Hop 5 19.9 IBUs
    0.50 oz Falconer's Flight [11.00 %] - Boil 15.0 Hop 6 8.2 IBUs
    2.0 pkg Safale American (DCL/Fermentis #US-05) Yeast 7 -
    1.50 oz Falconer's Flight [11.00 %] - Dry Hop 8. Hop 8 0.0 IBUs


    Mash Schedule: Single Infusion, Medium Body, Batch Sparge
    Total Grain Weight: 12 lbs 12.0 oz
    ----------------------------
    Name Description Step Temperat Step Time
    Mash In Add 15.94 qt of water at 163.7 F 152.0 F 60 min

    Sparge: Batch sparge with 4 steps (Drain mash tun, , 1.53gal, 1.53gal, 1.53gal) of 168.0 F water
     
  4. #4
    ArcaneXor

    Well-Known Member

    Posted Nov 3, 2013
    The difference is the boil size. You did a partial (concentrated) boil with the extract, and a full boil with the all grain.
     
  5. #5
    BigEd

    Well-Known Member

    Posted Nov 3, 2013
    Two main factors determine IBU extraction, OG and boil volume. In the case of extact vs all-grain of the same recipe both factors are at work. The all-grain is a full volume boil the extract is partial volume. A larger volume along with a more dilute solution (lower OG in the full volume) results in a higher IBU rate in the all-grain version. To get the same IBUs here you will need less hops in the full volume boil.
     
  6. #6
    khkman22

    Active Member  

    Posted Nov 3, 2013
    Thanks. I'm new at this so that's something I had probably read before, but I didn't really pay attention to since I have only bought kits to this point.
     
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