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Old 01-28-2010, 04:03 PM   #1
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Default how long before O2 is bad?

So, this weekend me and a buddy are planning a double-brew. he's doing an extract w/grain, i'm doing an all-grain.

so he was going to brew while I mashed. seems like it'll work out great, but he will probably stick around for awhile, then drive home. my question is, how long does he have before he won't want any more o2?

i'm thinking he will be perfectly fine, but i was just curious.

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Old 01-28-2010, 04:07 PM   #2
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Huh?

8ppm by DO meter or a 15 second blast of pure is usually enough.

Or, are you asking how long your brew buddy will mooch the air out of your house? That may take longer depending on available stock of homebrew.

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Old 01-28-2010, 04:13 PM   #3
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If I am reading you right, he plans to oxygenate his beer at your place, then pitch the yeast when he gets home? And you are (sort of) worried that the oxygen you add to his wort will has been replaced by air during this time?

In a glass carboy with a solid bung, the gas exchange rate is likely to be very slow. Even driving, the O2 wont be able to get out.

In a bucket, I doubt the seal would be quite as good. So there would be some exchange for air. But air still contains oxygen, so it wouldn't be a complete loss. If he is driving a long way on bumpy roads with crappy shocks, just forget oxygenating and let the trip aerate the wort for him

I'm sure it'll be fine!

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Old 01-28-2010, 04:13 PM   #4
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Quote:
Originally Posted by GilaMinumBeer View Post
Huh?
Yeah...uh...ditto.

What's the question?
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Old 01-28-2010, 04:20 PM   #5
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My understanding is that he will be aerating once he gets home? That shouldn't be a problem, anything before high krausen shouldn't cause problems.

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Old 01-28-2010, 04:23 PM   #6
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As long as you keep the garage door cracked open neither of you should die from oxygen deprivation.







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Old 01-28-2010, 05:12 PM   #7
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sorry.

he's going to aerate/pitch at my house, sit around for a good 6-8 hours, then drive home.

i was wondering if aeration 8 hours after pitching is good or bag.

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Old 01-28-2010, 05:21 PM   #8
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ok, maybe a better question is:

will a 90 minute mash be ok for this ESB?

9.25 maris otter
1.25 simpsons medium crystal

i'll probably have to mash for 90 while he gets his brewed/cooled.

thanks!

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Old 01-28-2010, 05:26 PM   #9
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Quote:
Originally Posted by motobrewer View Post
sorry.

he's going to aerate/pitch at my house, sit around for a good 6-8 hours, then drive home.

i was wondering if aeration 8 hours after pitching is good or bag.
It will be fine. The yeast will have barely taken off by then, so extra oxygen/agitation will certainly not hurt the beer. Oxygen is only really bad after fermentation has started.

[note: fermentation is the anaerobic process of converting the sugar to ethanol and CO2. Growth is aerobic.]
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Old 01-28-2010, 05:32 PM   #10
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thanks biobeing!

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