Why is it important to disconnect hoses from a pressure source during maintenance?

Disconnecting hoses from a pressure source during maintenance is crucial primarily to reduce the risk of accidental pressurization. When hoses remain connected to a pressurized system, there is a significant danger of unintentional release of pressure or an uncontrolled burst of compressed gas or fluid. This can pose serious safety hazards not only to the personnel conducting maintenance but also to surrounding equipment.

By disconnecting hoses, technicians can safely handle equipment without the fear of sudden pressurization, which could lead to injuries or equipment damage. It ensures a controlled environment where maintenance tasks can be performed without the risk of unexpected pressure-related incidents. This safety measure is a fundamental practice in maintaining various life support systems, including those used in diving, where conditions must be meticulously controlled for the safety of divers relying on these systems.