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Old 01-03-2010, 08:51 PM   #1
jigidyjim
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Default how does blow-off affect taste of beer?

If there a difference in beer if the blow-off goes out a blow-off tube, versus using a larger fermentation container and letting it settle back into the beer?

What do commercial beers do?

Thanks.

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Old 01-03-2010, 08:58 PM   #2
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The difference is that a completely sealed fermenter will blow up. This has a terrible effect on the beer.

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Old 01-04-2010, 02:57 PM   #3
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Oops I didn't mean sealed, I meant the difference between having a bunch of krausen leave the fermenter through a blow-off tube, and having it stay there and go back down because the fermenter is large enough to contain it all.

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Old 01-04-2010, 03:41 PM   #4
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You'll lose some bitterness to the blowoff. Worse, you'll lose some beer.

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Old 01-04-2010, 04:23 PM   #5
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I also believe there is a risk (perhaps small at best) that the krausen clogs the blow off tube which leads back to HickoryMike's statement.

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Old 01-04-2010, 04:26 PM   #6
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Quote:
You'll lose some bitterness to the blowoff. Worse, you'll lose some beer.
No, bittering only occurs in the boil.
Yes

Most commercial operations use a blow-off of some sort, unless they are doing open fermentation.
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Old 01-04-2010, 04:58 PM   #7
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Originally Posted by david_42 View Post
No, bittering only occurs in the boil.
Yes

Most commercial operations use a blow-off of some sort, unless they are doing open fermentation.
Hop alpha acids are only isomerized in the boil to become bittering iso-alphas, but it's wrong to assume that you can't lose iso-alphas post-boil. At least, according to Palmer, yeast can force as much as 40% of dissolved iso-alphas to precipitate. According to Daniels, blow-off can result in losses of up to to 15% total iso-alphas.

I think you're confusing "blow-off" with standard airlock offgassing. Fermentation blow-off is the result of fermenting in a vessel that is too small to contain the resulting krausen. It's a fault, not a feature (unless you're Bass Ale, and they recover the beer). I've toured many commercial operations, and I've not yet seen one that seeks to encourage blow-off .
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