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Thread: Stuck fermentation

  1. #1
    Join Date
    Nov 2018
    Location
    Amboise, France
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    37

    Stuck fermentation

    Fellows
    We have an IPA with an OG of 15.1 P
    We are using US-05 dry yeast and the fermentation activity is nearly done
    Temp is 64F, started at and target is 68F. We cannot increase temp. Building is at ~63F
    We are shooting for a FG at 3P but we are at 6.1P
    I havenít dry hopped yet which may kick the yeast a little

    Iíve been advised to use dextrose (after boiling it) to get close to our 6.9ABV target

    It is a 10 bbl batch

    Where can I find info on how much sugar to add to achieve FG?

    Iíll also move yeast from one FV to another to increase yeast cell count in a couple days.

    Is there any other recommended way to motivate the yeast?

    Thanks

    Matt


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  2. #2
    Join Date
    May 2012
    Location
    Livermore, CA
    Posts
    680
    Adding dextrose to get to your target abv is still going to leave you with a really sweet beer. Your best bet is to krausen it with some really active fermenting wort, after you have warmed it up a bit. You need to find a way to warm it up, halogen lamps on un-insulated areas, circulate the beer through a sanitized heat exchanger with warm water running through the other side, or warm water through the jackets. If you cant do that, I would suggest you dump it and start over. Theres no saving this beer as designed without the ferment finishing naturally, it may even have hit its maximum attenuation depending on the beer design and mash temps. Adding dextrose will likely get it going again, but it probably wont go past 6 P again, and youll be stuck with a really sweet IPA.

  3. #3
    Join Date
    Nov 2018
    Location
    Amboise, France
    Posts
    37
    Quote Originally Posted by jebzter View Post
    Adding dextrose to get to your target abv is still going to leave you with a really sweet beer. Your best bet is to krausen it with some really active fermenting wort, after you have warmed it up a bit. You need to find a way to warm it up, halogen lamps on un-insulated areas, circulate the beer through a sanitized heat exchanger with warm water running through the other side, or warm water through the jackets. If you cant do that, I would suggest you dump it and start over. Theres no saving this beer as designed without the ferment finishing naturally, it may even have hit its maximum attenuation depending on the beer design and mash temps. Adding dextrose will likely get it going again, but it probably wont go past 6 P again, and youll be stuck with a really sweet IPA.
    Thanks for your answer
    I am slowing increasing temp but yeast activity remains slow.
    Iíll give it another 3/4 days and see if it kicks back...
    Thanks again


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  4. #4
    Join Date
    Jan 2016
    Location
    very cold place
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    Quote Originally Posted by Mattieu View Post
    Thanks for your answer
    I am slowing increasing temp but yeast activity remains slow.
    Iíll give it another 3/4 days and see if it kicks back...
    Thanks again


    Sent from my iPhone using Tapatalk
    you can also add some lager or powerful ale (like Nottingham) yeast to restart the fermentation. Also, simple circulation from lowest port to mid one (if you have 2, of course) by some small pump heats beer a bit (because of pump heating itself and liquid spinning at 3k rpm), and also distributes and mixes yeast a bit better.

  5. #5
    Join Date
    May 2012
    Location
    Livermore, CA
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    680
    Quote Originally Posted by Stiletto View Post
    you can also add some lager or powerful ale (like Nottingham) yeast to restart the fermentation. Also, simple circulation from lowest port to mid one (if you have 2, of course) by some small pump heats beer a bit (because of pump heating itself and liquid spinning at 3k rpm), and also distributes and mixes yeast a bit better.
    That does help, would not run the pumps at full tilt though, 3600 rpm has some pretty high shear forces and is not great for the yeast.

  6. #6
    Join Date
    Oct 2013
    Location
    Ireland
    Posts
    23

    Warm another tank and transfer beer in

    Quote Originally Posted by Mattieu View Post
    Thanks for your answer
    I am slowing increasing temp but yeast activity remains slow.
    Iíll give it another 3/4 days and see if it kicks back...
    Thanks again


    Sent from my iPhone using Tapatalk
    You could warm the beer a small amount by preheating a second fermenter with a hot water rinse and then transfer the stuck beer into the second fermenter. The beer will pick up a little heat from the warmth of the tank and the transfer will rouse the yeast.

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