stuck fermentation? or something else

Discussion in 'Homebrewing' started by ChazBoner, Dec 3, 2015.

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  1. ChazBoner

    ChazBoner Zealot (527) Jun 29, 2014 Tennessee

    Hey everyone, I'm having a problem with my current batch. It's a Brewer's Best Oatmeal Stout 5 gallon kit.

    Here was my brewday - steeped grains around 150 degrees in two separate bags for 45 minutes in about 2 gallons water. 1 pound oats, 10 oz. dark chocolate, 12 oz. 2-row pale, 6 oz. victory. Brought to a rolling boil and added more water, 3.3 pounds LME, 3 pounds dark DME, .5 pounds maltodextrin. Then boiled 1 oz. Brewer's Gold hops for an hour. Cooled with wort chiller to around 75 degrees, stirred vigorously for 5 minutes, pitched dry yeast on top (Nottingham i think) at around 73 degrees, stirred gently and topped up. It's been kept around 68 to 71 degrees since then in the primary.

    Can't remember OG (should have written it down) but i think it was around 1.056. It's been 6 days, I've had krausen. 3 days ago a hydrometer reading said 1.033. I dissolved some corn sugar and added to the wort hoping to give the yeast a boost. Now my reading is 1.030. A sample is silky and tastes alright but I'd really like to get this batch up to 5% at least. The box said alcohol range would be 5.5% to 6%.

    I found a homebrew thread where alot of other people were having trouble with this kit. Here's the link - http://www.homebrewtalk.com/showthread.php?t=208196

    Dunno if this recipe can even get up to 5.5% or not. I've not tried anything outside the recipe besides adding extra sugar. Any ideas?
     
  2. Brew_Betty

    Brew_Betty Initiate (0) Jan 5, 2015 Wisconsin

    According to your hydrometer readings, your beer is still fermenting and you are being too impatient. Let the yeast work. Check it after 14 days of fermentation.
     
  3. GreenKrusty101

    GreenKrusty101 Initiate (0) Dec 4, 2008 Nevada

    Yes, wait another week and take a gravity...but based on the recipe I'd expect it to finish high (but not your current high).
    Any recipe with that much dark extract and maltodextrin is not going to go very low.
    Out of curiosity what kind of oats did they give you? ...rolled or malted? If the oats were flaked/rolled, I don't think there was enough 2 row to convert...especially in a steep.
     
  4. JackHorzempa

    JackHorzempa Grand Pooh-Bah (3,375) Dec 15, 2005 Pennsylvania
    Society Pooh-Bah

    How much 2-row do you think is needed? 12 ounces 2-row to 16 ounces oat will not have sufficient DP?

    Cheers!
     
  5. ChazBoner

    ChazBoner Zealot (527) Jun 29, 2014 Tennessee

    Green Krusty I believe they were flaked/rolled oats
     
  6. GreenKrusty101

    GreenKrusty101 Initiate (0) Dec 4, 2008 Nevada

    Jack, if he was performing a mash, I would say, "no problem" (probably), but he was just steeping in 2 gal. if I remember right...I haven't run it thru a calculator and even then it probably wouldn't be accurate...an iodine test would probably be in order for this scenario.
     
  7. JackHorzempa

    JackHorzempa Grand Pooh-Bah (3,375) Dec 15, 2005 Pennsylvania
    Society Pooh-Bah

    So, is you concern the steep (mash) thickness vs. the proportion of 2-row to flaked oats?

    I know that folks who mash using the BIAB method have very thin mashes so I would guess that 1.75 lbs. of grain to 2 gallons of water would be a bit thinner than 'normal' but would that necessarily mean that it wouldn't convert?

    I have never conducted the BIAB mash so I do not have any personal experience here.

    Cheers!
     
  8. VikeMan

    VikeMan Grand Pooh-Bah (3,067) Jul 12, 2009 Pennsylvania
    Pooh-Bah

    Assuming Briess Pale Ale Malt, Any type of Chocolate, Briess Victory, and Unmalted Oats, I get a diastatic power of 23 Deg L, which is pretty poor. And yes, I count all the grains, because they are in the mash and they are tying up enzymes, even though the Chocolate Malt doesn't contain much starch. If you subscribe to the crystal/roasted malts "don't count" school and therefore ignore the chocolate, the DP is 30 Deg L, which is still marginal.

    But a lot depends on what the OP meant by "2-row pale."
     
  9. JackHorzempa

    JackHorzempa Grand Pooh-Bah (3,375) Dec 15, 2005 Pennsylvania
    Society Pooh-Bah

    I suppose I will take a crack at the Diastatic Power of the grain bill.

    Lintner_for_batch = Σ(lintner_for_grain * weight_of_grain) / (total_batch_grain_weight).

    Assuming that Victory, Chocolate and Oat have 0 °L and that the 2-row is 140 °L per Dr. Brad Smith my reckoning is:

    Liner for batch is 0,75 lbs. x 140 °L/2.75 lbs. = 38 °L

    Since this calculated value of 38 °L exceeds the value 30 °L it would seem that conversion would happen.

    I am uncertain whether a mash thickness of 2.9 quarts/lb. will have an impact here. It is my understanding that BIAB brewers mash at this type of thickness.

    Cheers!

    http://beersmith.com/blog/2010/01/04/diastatic-power-and-mashing-your-beer/
     
  10. VikeMan

    VikeMan Grand Pooh-Bah (3,067) Jul 12, 2009 Pennsylvania
    Pooh-Bah

    What kind of 2-row? 140 sounds like a typical American 2-Row "brewer's" malt. But OP said 2-row "pale" which would indicate a "pale malt" or "pale ale malt." These are higher kilned and much lower in DP. The value of 140 Deg L at the link you posted is too high for any Pale Malt higher kilned than standard 2-row that I've ever seen. (For example, Briess specifies 140 for their 2-Row "Brewer's" and 85 for their "Pale Ale" malt.)
     
    #10 VikeMan, Dec 4, 2015
    Last edited: Dec 4, 2015
  11. GreenKrusty101

    GreenKrusty101 Initiate (0) Dec 4, 2008 Nevada

    Fortunately, the kit maker probably used the cheaper 2 row, which is usually the highest DP...next to 6 row anyway
     
  12. VikeMan

    VikeMan Grand Pooh-Bah (3,067) Jul 12, 2009 Pennsylvania
    Pooh-Bah

    Could be. I just took a look at the Brewer's Best recipe sheet. It does say "2-Row Pale" as the OP said. Pale just isn't the right descriptor for the cheap stuff, but I wouldn't bet a paycheck that the writer of the sheet knows the difference.
     
  13. JackHorzempa

    JackHorzempa Grand Pooh-Bah (3,375) Dec 15, 2005 Pennsylvania
    Society Pooh-Bah

    From the linked article: "American 2 Row Pale Malt: 140 °L"

    As you can easily discern the words "2 Row Pale" appears above.

    Cheers!
     
  14. VikeMan

    VikeMan Grand Pooh-Bah (3,067) Jul 12, 2009 Pennsylvania
    Pooh-Bah

    Yes, I see that. And it's wrong. Do you agree that basic 2-row brewer's malt is different from 2-row pale and pale ale malts? If not, why not address my other statements that you quoted? If so, are we in agreement that 140 deg L is not a good value for 2-row "pale" malt?
     
    #14 VikeMan, Dec 4, 2015
    Last edited: Dec 4, 2015
  15. ChazBoner

    ChazBoner Zealot (527) Jun 29, 2014 Tennessee

    Took a hydrometer reading today and got 1.028, so I'm still fermenting, albeit slowly. I appreciate everyone's advice. Just going to wait this one out.
     
    Bassnut54 likes this.
  16. ChazBoner

    ChazBoner Zealot (527) Jun 29, 2014 Tennessee

    Well I'm 11 days since brew day now, and my hydrometer reading is still around 1.029. My bucket thermometer has been around 67-69 degrees. I'm at a loss as to how to get this batch up to its recommended SG of 1.016
     
  17. Brew_Betty

    Brew_Betty Initiate (0) Jan 5, 2015 Wisconsin

    All those opposed to yeast re-hydration are going to pretend this thread never happened...
     
  18. machalel

    machalel Initiate (0) Jan 19, 2012 Australia

    Give it a gentle stir with a sanitised long-handled spoon & keep temp up about ~70F

    If that doesnt work

    Pitch some more healthy yeast
     
    PapaGoose03 likes this.
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