For the first time today, I found out I needed to listen to my instinct in brewing, and use a blow off tube...
Only I didn't heed that advice.
I brewed a 1.101 stout yesterday. I pitched a baby starter, and 2 packs of wyeast 1084. I had the temp at 64* when I went to bed in the swamp cooler in the bath tub.
Went to work, checked it this morning and found around 2 inches of krausen it in already. Cool deal, healthy fermentation takin off!
I'm at work, and thinking.. Hrmm.. I bet that damn thing is overflowing that airlock.. I had around 5.75 gallons in a 6.5 gallon carboy... Not much space, but I never really get wild and crazy blow off, and never enough to get up in the neck.
I come home late around 8pm, and look in the guest bathroom.. I've got wort sprayed around 6 feet up the shower wall, and the tub it's sitting in, the water is now a nice chocolate brown. The positive, is the bung stayed in, and the airlock cleared it's self, so not real problems. Nasties can't get it with the crap coming out!!
Anyways- Hooked up some hosing, found out after I cut my extra racking cane a bit short, that it's too small OD to fit the tubing and the bung, so I cut off the bottom of my airlock and made it all fit. Put it in a growler of sanitizer and it's going along just fine. Added some ice and got the temp down back to 64 from 68 and we're fine now...
So lesson learned... Don't over fill your primary, I should have boiled down and gotten a higher gravity, and done a 2 hour boil, and I shouldn't have filled so high. Luckily, I did in a way, as I lost some good sweet beer, but I must say.. My guest room smells like a chocolate factory!!!!
Use a blow off seriously. If you over pitch, or have a big beer, it's paramount.