Air Compressors

Air compressors are essential components in fire protection systems utilizing dry pipe or preaction configurations, where air or nitrogen pressure is required to maintain system supervision and prevent water from entering the piping until activation. The compressor maintains a preset supervisory pressure within the system, automatically cycling to compensate for minor pressure losses and ensuring reliable valve operation. There are three main varieties of air compressors used in fire protection applications: riser-mounted, base-mounted, and tank-mounted.

Riser-mounted compressors are compact, preassembled units installed directly on the system riser, ideal for small dry or preaction systems where space is limited. Base-mounted compressors are floor-standing units that provide greater air output and durability for medium to large systems, often located in mechanical rooms. Tank-mounted compressors integrate the compressor and an air receiver tank on a single frame, providing stored air capacity to reduce compressor cycling and extend equipment life. Compressors can be equipped with pressure switches, gauges, and relief valves to maintain the system within precise operating ranges, preventing both under-pressurization, which can lead to false alarms, and over-pressurization, which can delay valve operation. Regardless of type, all compressors must deliver clean, dry air to minimize internal corrosion and maintain consistent system performance, supporting the overall integrity and responsiveness of the fire protection system.