This thread started me to consider fermenting in a corny keg for a number of reasons. Has anyone tried this?
Pros:
- All stainless steel, sanitize with boiling water, doesn't break, degrade or harbor bacteria
- Almost endless life, can be rebuilt over and over
- Can be completely sealed or vent co2 out the gas port. When you remove the gas connector it seals immediately. Rated for 125psi
- Easy to handle
- Tall and skinny, can fit more onto the fermentation chamber
- Easy to rack off to secondary (to another keg for serving, unitank) Floating liquid line could eliminate transferring trub to unitank
- Can adapt a spunding valve and naturally carbonate with the fermentation itself
- reduced oxygen exposure, could be theoretically eliminated
- Crash cooling under pressure, no suck back from airlock
- Experimenting with fermentation under pressure, cleaner lagers at higher temperatures
- Relatively cheap, used ones are still under $75 US, new ones are $125 for a high quality keg (Made in Italy)
Cons:
- Can only ferment 4 gallons (biggest draw back). With trub loss there may only be 3.5 gallons of finished beer. This could be improved be transferring trubless wort and leaving the rest in the kettle, or brewing 6 gallon batches and splitting them between 2 kegs. Still not ideal.
- Difficult to add finings after fermentation. Would have to either remove cover, which would negate the "no exposure to oxygen" or devise a way to force finings under pressure into gas port while the keg maintained a positive pressure.
- Dry hopping still is a problem and there are no solutions that I can think of that would not add oxygen.
- Can't see the fermentation, I kind like glass for that.
Or I could buy 4 of these Sabco fermenters (link below). They have thermowell, racking cane, multiple inlets on top (large enough to force hydrated hop slurry under pressure into fermenter), ferment a full 5 gallons with plenty of head space. I'm sure my wife wouldn't mind me spending 3000 bucks for them.
https://brewmagic.com/products/fermenter-7-75-gal-by-sabco/