Our fleet does not drain air tanks especially in cold weather (we're getting a cold snap right now -20 celsius and lower with the wind chill). Operators open the drain for a couple of seconds on their post trip.
We have heated air dryers and have better luck preventing air valves from freezing & air systems building up normally. We also add brake line antifreeze in the wet tank during a service.
Does anybody follow this practice or do you have a different approach?
Appreciate your feedback.:)