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Old 09-21-2009, 02:03 PM   #1
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Default Did I murder my yeast?

I pitched a pack of Safale 04 into my stout about a week ago. I forgot to take a temp reading and think the wort may have been over 80F when I pitched. (long day, long story) I had some air lock activity the next morning, and nothing since. I know that is not a good indicator, so last night I took a gravity reading and it is 1.019 at around 73F. There is no krausen, foam or anything on top, only the yeast looking exactly like they did when i sprinkled them into the wort. I did not hydrate them prior to pitching.
Could the high temp kill the yeast, or shock them so much they don't do their job?

I swirled the yeast around and got more air lock activity last night, but it has ceased as of this morning. I am going to give it a few more days, but was debating making a starter and dumping that into the batch, or pitching onto a fresh cake in 3-4 weeks.
Ideas?
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Old 09-21-2009, 02:08 PM   #2
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What kind of beer is it? At 1.019, the beer may just be done. What was the OG?
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Old 09-21-2009, 02:17 PM   #3
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+1 to it being done.You probably pitched to warm and sent the S-04 into overdrive.
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Old 09-21-2009, 02:46 PM   #4
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S-04 has been known to ferment out in a 24 hour period. I would say it is probably done and just cleaning up after itself now. Give it another week and check the gravity.
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Old 09-21-2009, 03:27 PM   #5
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Forgot to take the OG.
It is a stout loosly based on the tasty oats stout recepie on BMW site, but with a lot more oats, an additional pound of 2 row and a different hop selection and schedule.
Beer tools says it should be down around 1.013 so my plan is to wait a few days to see what happens and go from there I guess.
Even if it fermented out that quick, would the yeast still be floating on top with no krausen?
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Old 09-21-2009, 03:31 PM   #6
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What you may be see are little floating yeast cakes it's fine. They will fall out of suspension eventually. I would also expect that you beer is probably done if only a few points off from the expected FG. Did you correct for temp?
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Old 09-21-2009, 09:44 PM   #7
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Also, yeast die around 138* so you're probably okay.
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Old 09-21-2009, 09:54 PM   #8
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Swirl it. If there is any work left to do, that will help get the yeast in suspension. Then let it sit another week.
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