Coldbreak Brewing HERMS Giveaway!

HomeBrewSupply AMCYL Brew Kettle Giveaway!

Home Brew Forums > Home Brewing Beer > Beginners Beer Brewing Forum > To Blow-off or not to Blow-off?
Thread Tools
Old 11-29-2007, 08:03 PM   #1
Feedback Score: 0 reviews
Join Date: Nov 2007
Posts: 131
Liked 2 Times on 2 Posts

Default To Blow-off or not to Blow-off?

I'm not exactly a newbie but I'm still in the novice phases here... I've always brewed 5-gallon batches from kits or CloneBrew recipes and I've NEVER used a blow-off tube because I didn't know they existed until recently--I've always just use an airlock. I guess I've just been very lucky that I've never had a leak or explosion.

The question is, how do you predict *in advance* whether you will need to blow off? As in, *before* the mess? Are there certain kinds of yeasts or combinations of ingredients that build up more pressure than an airlock can handle?

My fermenting "closet" only has a vinyl accordion door so if I had a leak or popped lid I would not only be cleaning up wort, but also two alcohol-poisoned cat corpses (or at the very least, cat vomit in every room of the house).


P.S. I do my primary fermenting in an a plastic bucket, secondary in a glass carboy.

CallMeZoot is offline
Reply With Quote
Old 11-29-2007, 08:08 PM   #2
Feedback Score: 0 reviews
Drunkensatyr's Avatar
Join Date: Apr 2007
Posts: 2,017
Liked 7 Times on 3 Posts


Really it has a lot to do with your gravity, temperature and type of yeast. I used to only use airlocks, but here lately I will NOT trust a beer without a blow off. The last 3 batches I have made all blew atleast a few cups out of a 7 gal carboy. Just goes to show that you should never trust your beer to murphy. There's a law for that.

Drunkensatyr is offline
Reply With Quote
Old 11-29-2007, 08:18 PM   #3
Feedback Score: 0 reviews
ohiobrewtus's Avatar
Join Date: Nov 2006
Location: Ohio
Posts: 7,814
Liked 43 Times on 39 Posts
Likes Given: 4


I typically stick to the same 6 yeast strains and unless I'm reusing a cake I just know that they're not gonig to go crazy on me and require a blowoff.

By the same token, when I brew a Hefe I don't even get an airlock out. Blowoff tube just automatically goes in.
Originally Posted by the_bird
Well, if you *love* it.... again, note that my A.S.S. has five pounds.
ohiobrewtus is offline
Reply With Quote
Old 11-29-2007, 08:41 PM   #4
Feedback Score: 0 reviews
CBBaron's Avatar
Join Date: Feb 2007
Location: Cleveland
Posts: 2,787
Liked 7 Times on 5 Posts


I just always use a blow off for the first couple days. Its easy and may potentially save a huge mess. If you do 5gal batches in 7.9gal (or bigger) fermenters then the blowoff is probably not necessary but for normal 5.5gal in 6.5gal buckets or 6gal carboys why take the chance?
CBBaron is offline
Reply With Quote
Old 11-29-2007, 08:59 PM   #5
Ale's What Cures You!
Feedback Score: 0 reviews
Yooper's Avatar
Join Date: Jun 2006
Location: UP of Michigan
Posts: 65,467
Liked 6067 Times on 4318 Posts
Likes Given: 1559


I use a large (7.5 gallon) plastic primary bucket. I've used a blow off tube maybe a total of three times. But, I don't make hefe's or other wheat beers that are notorious for blowing their tops. The last time I used one, I knew it was coming. I pitched on a yeast cake and waited. After it got started, I left the blow off tube on until it subsided a few days later. Otherwise, I don't use them.
Broken Leg Brewery
Giving beer a leg to stand on since 2006

Follow me on facebook:
But I'm pretty boring so don't expect much!
Yooper is offline
Reply With Quote
Old 11-29-2007, 09:55 PM   #6
Feedback Score: 0 reviews
Joker's Avatar
Join Date: Nov 2007
Location: Orygun
Posts: 1,963
Liked 22 Times on 21 Posts
Likes Given: 4


I have a 6.5 gallon bucket and 7 gallon carboy that are my primary fermenters so I don't use blow off tubes. If I was using 5 gallon carboys I would. Actually I came close to blowing up the 6.5 bucket when I used the yeast cake from a prior batch. I don't play that game anymore.
Joker is offline
Reply With Quote
Old 11-30-2007, 06:13 PM   #7
Feedback Score: 0 reviews
Join Date: Jan 2007
Location: Bremerton, WA
Posts: 100

I've always used a blowoff tube and have never had to clean up a beer guiser. As a result, I will continue to use a blowoff tube to be safe. Setting up the blowoff tube will ALWAYS be easier than cleaning up beer.

covered95 is offline
Reply With Quote

Thread Tools

Similar Threads
Thread Thread Starter Forum Replies Last Post
blow off robd All Grain & Partial Mash Brewing 1 06-09-2009 11:10 AM
Blow off top fire943 Beginners Beer Brewing Forum 23 04-14-2009 02:16 AM
Blow-Off: How Much is Too Much? Pelikan Beginners Beer Brewing Forum 10 01-14-2009 03:32 AM
Blow off ? clemson55 Beginners Beer Brewing Forum 5 04-10-2008 05:17 AM
my first blow off dangermouse Beginners Beer Brewing Forum 4 04-17-2006 01:29 PM

Forum Jump

Newest Threads