once you remove the solenoid actuator from the cylinder valve assembly you should be safe from discharging any gas. after that, remove the pipe leading to the main outlet on the tank valve and the tank should be free from the system and safe to haul away (although it’ll still have gas in it). you should be able to remove the rest of the system at that point.
alternatively you could discharge the system and let the room air out for an hour, then go tear it down at will.