Author Topic: Dead yeast?  (Read 2169 times)

Offline madscientist

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Dead yeast?
« on: November 13, 2012, 05:31:44 AM »
So Sunday I brewed an IPA and pitched a packet of US-05.  Starting gravity was 1.063.  I don't typically rehydrate and have ha excellent results.  So like the others I just sprinkled on top.  Pitching temp was probably around 62.  There have been no visible signs of fermentation.  When I looked at the beer it looks like its done fermenting but there is no Krausen at all.  Refractometer says its still 1.063.  So I'm wondering if the yeast is dead, I killed it, and should I repitch or rouse it somehow.  Yeas was purchased from my LHBS and well within the exp date. 

Thanks
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Offline ynotbrusum

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Re: Dead yeast?
« Reply #1 on: November 13, 2012, 05:56:49 AM »
I would repitch at this point, if you have more US-05.  Maybe rehydrate it to verify that the batch is good - it should get frothy in a half hour.
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Offline madscientist

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Re: Dead yeast?
« Reply #2 on: November 13, 2012, 06:43:56 AM »
Looks like I'm stopping at my LHBS tomorrow since they're closed today.  Do you think if I contact Safeale they'd send me another packet of yeast?  I'd buy a second pack in the meantime, but do they do that if the yeast is dead?
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Online Joe Sr.

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Re: Dead yeast?
« Reply #3 on: November 13, 2012, 08:30:52 AM »
If you bought it at the LHBS, they ought to replace it for you.

I've never had the issue with dry yeast, but I have had a Wyeast pack replaced when it did not swell.  No questions asked.
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Online euge

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Re: Dead yeast?
« Reply #4 on: November 13, 2012, 10:12:18 AM »
Do you have the serial number off the pack? It may be a bad batch.
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Offline madscientist

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Re: Dead yeast?
« Reply #5 on: November 13, 2012, 02:16:33 PM »
Do you have the serial number off the pack? It may be a bad batch.

Yea I saved the packet from the trash lol.  I am going to call them and see if they can get any info.
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Offline beerlord

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Re: Dead yeast?
« Reply #6 on: November 13, 2012, 02:42:44 PM »
I've had 05 take as long as 36 hours but I underpitched.  I would definitely get more, rehydrate and re-pitch.

Offline redbeerman

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Re: Dead yeast?
« Reply #7 on: November 14, 2012, 07:44:08 AM »
I just used S-05 in an imperial red I brewed a couple of weekends ago.  I pitched at 60 and the wort temp held low for a couple of days.  It took a good 24 hours before there was any bubbling and 36 before krausen formed.
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Offline davidgzach

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Re: Dead yeast?
« Reply #8 on: November 14, 2012, 12:06:36 PM »
How old was the pack?  One pack in 1.063 wort, not hydrated and at 62F could take a while to get going.  You could lose up to half of your viable cells by not rehydrating and at the low end of the temperature range, they could simply be struggling.  I agree with repitching another that is rehydrated. 
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Offline madscientist

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Re: Dead yeast?
« Reply #9 on: November 15, 2012, 05:19:08 PM »
So yea... took a while to get going, it's fermenting now.  Should I still reptich?
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Re: Dead yeast?
« Reply #10 on: November 15, 2012, 05:28:49 PM »
So yea... took a while to get going, it's fermenting now.  Should I still reptich?

Only if you're in a hurry to get to FG for some reason.
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