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We roll and shake our kegs all the time under high burst carb pressure to do just this.
The real trick would be to inject CO2, via carb stone, from bottom of beer, at every so slightly increasing pressure, to ensure the tiny bubbles were absorbed before reaching the beer's surface, and increasing the pressure slowly as pressure and dissolved CO2 increased until equilibrium at server pressure is reached. With beer at serving temp the whole time of course.
Simple. Just need a glass keg to keep watch.
The real trick would be to inject CO2, via carb stone, from bottom of beer, at every so slightly increasing pressure, to ensure the tiny bubbles were absorbed before reaching the beer's surface, and increasing the pressure slowly as pressure and dissolved CO2 increased until equilibrium at server pressure is reached. With beer at serving temp the whole time of course.
Simple. Just need a glass keg to keep watch.