What is the primary feature of air pressure in dry pipe systems?

In dry pipe systems, the primary feature of air pressure is that it is maintained at a level below the water supply pressure. This is crucial for the operation of dry pipe sprinklers, which are designed to contain air under pressure in the pipes until a fire occurs. When a fire is detected, the air pressure drops, allowing the water valve to open and water to flow into the system.

Maintaining air pressure below the water supply pressure ensures that the system functions correctly and allows for rapid response to fire conditions. If the air pressure were higher, it could prevent the water from being released at the necessary time, defeating the purpose of the fire protection system. This controlled pressure differential is essential for the safe and effective operation of dry pipe fire suppression systems.

Understanding this aspect is key for firefighters, as it relates to how they respond to and manage equipment in fire scenarios.