From the HBD Archive
From: paul@susitna.dataio.data-io.com (Paul Brownlow)
Subject: Re: blow-off method
Date: 1990-04-18 23:00:43 GMT

Russ Gelinas <R_GELINA%UNHH.BITNET@MITVMA.MIT.EDU> wants to use closed
fermentation, and asks:

>Papazian says to pitch the yeast in the carbuoy, and then seal
>it with a water seal, but then where does the blow-off take place? If you
>did'nt seal it but put a blow-off tube instead, when *do* you seal it? Does
>the blow-off tube need a water seal (like the end of it underwater in a
>blow-off jar) too?

I use closed fermentation. After I pitch the yeast in the carboy, I place
a blowoff tube of 1-1/4" inside diameter (I think) in the carboy; the outside
diameter is large enough (1-3/8", I think) to make a tight seal in the throat
of the carboy. The other end of the 3-foot blowoff tube is submerged in a
12-quart stock pot which has about a gallon of water in it. The large
diameter tube reduces the likelihood that clogging will occur, and the deep
pot insures that it won't flood if I get a large amount of blow-off (usually
one to three quarts). The "free" end of the blowoff tube must be submerged
to create a seal; this minimizes the risk of wort/beer contamination and makes
the system a closed fermentation system.

The blowoff tube can be replaced with a fermentation lock when the major
activity subsides and no more krausen is being projected through the blowoff
tube. This usually occurs in 3 to 4 days.
- --
Paul Brownlow | "What a waste it is to lose
Data I/O Corp. Redmond, WA | one's mind -- or not have
.!uw-beaver!uw-entropy!dataio!paul | a mind. How true it is."
paul@data-io.com | -- Dan Quayle

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