I secondary/lager my lager beers in a keg with a 1/2" shorter dip tube than a normal keg. My poppets are a little screwey, so I connect gas line and beverage line just to hold pressure. I do not keep the keg under forced CO2 pressure, as I'm not looking to carbonate the batch until I transfer it to a serving keg.
My question is this. I've noticed that over time the keg loses pressure. If I pressurize the keg to purge air and seal the lid, then cut the gas, there will be no audible gas release when I open the relief valve. My thought is that the marginal amount of CO2 in the keg is disolving harmlessly into the beer leaving no pressure. The question is: Is this normal?
I'm not too worried about air contamination, because I'm not seeing any way for air introduction. I just find it weird that a pressurized keg will become unpressurized in 24 hours.
In the Keg (1) -- Pecan Brown
In the Keg (2) -- Mosaic SMaSH
In the Keg (3) -- Centennial IPA
Fermenting (1) -- Oktoberfest
Fermenting (2) -- ESB