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General Category => Yeast and Fermentation => Topic started by: donredbull on February 22, 2013, 03:05:01 AM

Title: When to use a blow off tube
Post by: donredbull on February 22, 2013, 03:05:01 AM
So when I was taught how to brew I was told after pitching and aeration to put a blow off tube on. But now that I have been reading more about brewing it seems like the standard practice is to put an air lock on and only attach the blow off tube if you need it. What do you all do? Does it matter if I just attach the blow off tube right after pitching? or am I just thinking about this way to much?
Title: Re: When to use a blow off tube
Post by: yso191 on February 22, 2013, 03:49:40 AM
I just always use a blowoff tube.  I may not need it, but that way I don't have to keep checking to see if I do.  They'll both serve the same function if you don't have krausen up into the neck of your fermenter and beyond - that's when you need the blow off tube.
Title: Re: When to use a blow off tube
Post by: donredbull on February 22, 2013, 04:11:56 AM
Thanks for replying so fast
Title: Re: When to use a blow off tube
Post by: The Professor on February 22, 2013, 04:13:15 AM
If your fermenting vessel is large enough, you don't ever need to use a blowoff tube. 
I don't think I've used one in over 21 years.
Title: Re: When to use a blow off tube
Post by: tygo on February 22, 2013, 12:08:03 PM
I'm usually trying to squeeze 5.5 gallons in a six gallon carboy so I almost always need one for ales.  I've learned my lesson and just put it on every time and replace it with the stopper and airlock when appropriate.
Title: Re: When to use a blow off tube
Post by: davidgzach on February 22, 2013, 12:46:29 PM
I'm usually trying to squeeze 5.5 gallons in a six gallon carboy so I almost always need one for ales.  I've learned my lesson and just put it on every time and replace it with the stopper and airlock when appropriate.

+1.  I always start with a blow off tube and switch to an airlock if I need to.
Title: Re: When to use a blow off tube
Post by: erockrph on February 22, 2013, 01:17:51 PM
Outside of weizens, I don't bother with them. But I brew smaller batches so I routinely have 30-50% headspace in primary. I just put some foil over my carboys, and with buckets I just put a dry airlock in the grommet to keep dust from getting in and lay the cover on loosely.
Title: Re: When to use a blow off tube
Post by: theDarkSide on February 22, 2013, 01:33:43 PM
I always use a blowoff tube and rarely ever bother switching to airlock.  I use 6 gallon better bottles with the orange carboy caps and it is so much easier sticking a 1/2" vinyl tube on the large port than trying to jam an airlock in there.
Title: Re: When to use a blow off tube
Post by: dbarber on February 22, 2013, 01:44:59 PM
The only time I use a blow off tube is when I use wyeast 3068 or 3787.
Title: Re: When to use a blow off tube
Post by: Hokerer on February 22, 2013, 02:12:23 PM
I do 5.5 gallon batches in 6 gallon better bottles so I always use a blowoff.  Only time I might switch to an airlock would be for extended aging or something like that.
Title: Re: When to use a blow off tube
Post by: kylekohlmorgen on February 22, 2013, 05:21:14 PM
Fermcap.

I can fit 5.5-6 gallons in a bucket and not worry about blow-off.
Title: Re: When to use a blow off tube
Post by: davidgzach on February 22, 2013, 06:32:15 PM
Fermcap.

I can fit 5.5-6 gallons in a bucket and not worry about blow-off.

The evil post! 
Title: Re: When to use a blow off tube
Post by: Wort-H.O.G. on February 22, 2013, 07:52:56 PM
i use a 6.5 gal carboy and only ever needed blow off tube with weizens..other than that i haven't had any need.
Title: Re: When to use a blow off tube
Post by: jeffy on February 22, 2013, 07:56:13 PM
I use carboys, usually a five gallon batch in a 6.0, 6.5 or 7 gallon carboy and use aluminum foil to keep things from falling into the beer until the kreusen falls, then I switch to an airlock.
Title: Re: When to use a blow off tube
Post by: Hokerer on February 23, 2013, 12:24:57 AM
Fermcap.

I can fit 5.5-6 gallons in a bucket and not worry about blow-off.

I prefer the blowoff.  No questionable additives to my brew plus the blowoff gets rid of the "braun hefe"
Title: Re: When to use a blow off tube
Post by: skrag6713 on February 23, 2013, 12:56:27 AM
i've only ever had one batch clog an airlock.  that was a batch that i poured my wort on a yeast cake of nottingham from a previous batch.  other than that i've always used airlocks.
Title: When to use a blow off tube
Post by: bluesman on February 23, 2013, 01:51:19 AM
I use a blowoff hose quite often. I like to use 6 gallon carboys and switch from an airlock to a blowoff when/if necessary. It's usually yeast dependent. I usually don't need a blowoff for American ale yeast or lager yeasts.

When fermenting APA/IPA, I'll use buckets and typically won't need a blowoff hose.
Title: Re: When to use a blow off tube
Post by: denny on February 23, 2013, 04:55:24 PM
I start out with a blowoff on every batch.  Not difficult to do and no problem even if you don't get blowoff.
Title: Re: When to use a blow off tube
Post by: Kaiser on February 24, 2013, 03:49:44 AM
IMO: always

Your want to blow off the Kraeusen. I even top off my beer if I notice that there will not be a blow off

Kai
Title: Re: When to use a blow off tube
Post by: corkybstewart on February 24, 2013, 05:21:58 AM
My fermentor is in a sealed wooden box and I can't see what it's doing so I always use a 1/2" blowoff hose.  I can hear the gas "thump" when it really gets rocking.  When I've tried an airlock I get nervous because I can't hear what's going on and I worry the airlock has blown out(it has happened).
Title: Re: When to use a blow off tube
Post by: donredbull on February 25, 2013, 02:16:27 PM
Right on thanks to everyone for their opinions.
Title: Re: When to use a blow off tube
Post by: In The Sand on February 25, 2013, 02:31:53 PM
I always use a blow-off tube to start.  Then switch to airlocks after the first dry hop addition or when moving to cold crash.