I have a stout (N.S.) on tap that is kegged and carbonated and want to move two gallons into a used 2 gal. whiskey barrel. I get the purging with CO2 and other O2 minimizing processes. 1. Is it okay to put cold, carbonated beer in a barrel? 2. If yes, how long should it stay there as a test? 3. Do I need an air-lock on it? Since the beer is cold now, it will expand as it warms to room temp (~67*f) 4. Any suggestions?