How do dry sprinkler systems differ from wet sprinkler systems?

Dry sprinkler systems are designed to prevent water from sitting in the pipes, which can freeze in colder climates. Instead of being filled with water like wet sprinkler systems, dry sprinkler systems are filled with pressurized air or nitrogen. When the system is activated due to a fire, the air pressure drops, which allows the valves to open and water flows from a separate storage system. This design is crucial in preventing pipe damage in freezing temperatures and allows for effective fire suppression in environments where freezing could be a concern.

The other options hint at different functions and features typical of fire sprinkler systems but do not accurately describe the primary distinguishing feature of dry sprinklers. For instance, while certain systems may require power, dry sprinklers primarily rely on air pressure for their operation rather than needing an electrical system. Additionally, while some sprinkler systems are connected to a constant water supply, this does not apply to dry systems until they are activated during a fire. Similarly, while fire pumps can be a part of various water supply systems, they are not specifically unique to dry sprinkler systems, which primarily utilize air pressure for their operation.