Ask Mr. Wizard

Using a Corny Keg For Chilling & Primary Fermentation

TroubleShooting

Idar Hoydal — Oslo, Norway asks,
Q

I want to ferment under pressure at 65–70 °F (18–21 °C) in a 5-gallon (19-L) Corny keg using a spunding valve set to 10–12 psi. My plan is to boil the wort, whirlpool the heck out of it to get the trub into the center of the kettle, then pump it directly into the corny keg, purge out the oxygen with CO2 and put it under light pressure. leave it to cool overnight and then pitch the yeast. Exactly what are the potential problems with this, if there are any?

A
There are a few possible problems with this plan, but none are insurmountable. What you are describing is something akin to coolships that were ubiquitously used by lager and ale brewers before
Response by Ashton Lewis.