General Category > Yeast and Fermentation

Fermenting a Barleywine

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davidgzach:
I got an O2 kit for Christmas and plan to use it for the first time on my first Barleywine.  Right now my recipe is at 1.102 for a 2.88 gallon batch.  I don't want to make a full 5G of this stuff!  I plan to repitch some WLB037 from a 1.050 Nut Brown Ale.  My questions:
1) How long should I aerate ~3 gallons of 1.102 wort with O2?
2) Should I re-aerate after a couple of days?  How many and for how long?
3) Should I add more slurry after a few days?  If yes, how many days?

Thanks!  Anything else I should be considering, please add!

Dave

euge:
I think a loose ROT could be 1-2 seconds per gallon?  Re-aerating not sure about and maybe not recommended. I pitched an entire additional fresh slurry of 001 my last high gravity ferment (1.106) when the brew got below 1.050 as insurance. It was below 1.010 at the final reading.

Just chugged along and took about 2 weeks at 70-ish temps.

dbarber:
For big beers I oxygenate for 2 minutes for a 5 gal batch.  I have never re-oxygentated but there are plenty of people who do.  For barleywines I rack the wort onto the yeast from a previous low-gravity beer and have never had a problem with the beers attenuating. 

The only other I would add is monitor your fermentation temperature and don't let it get out of the 60s.  When making a beer with this amount of sugar fermentation can really take off.

Mark G:
With pure O2, I would let it run for 60-90 seconds. At such a high gravity, it wouldn't hurt to aerate again after 12-24 hours. As far as repitching slurry, I'd say it's better to just pitch the appropriate amount upfront. mrmalty.com has a calculator for slurry pitching rate.

Jimmy K:
The figure I see is 1 minute of aeration at a flow rate of 1 liter O2/minute. The means you need a flow meter of course, but time isn't really a measure of how much O2 goes into the wort.
 
Adding more slurry after a few days is useless if you think about it.  Your yeast has gone through the growth phase at that point. It has reproduced many times over and there are billions of cells in there. Adding a few million more is not going to make a difference. Also, if you thought it did need help, it would have been better to add them at the beginning so they could multiply with the rest of the yeast cells.

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