What is the required pressure for dry chemical systems as per NFPA 17?

The NFPA 17 standard specifies that dry chemical extinguishing systems must operate effectively within a pressure range of 100 to 150 psi. This pressure range is essential for ensuring that the dry chemical agent is delivered efficiently and effectively to suppress fires; it ensures adequate flow rates and proper distribution of the extinguishing agent through the system's discharge nozzles.

Maintaining this pressure is crucial for the reliability and performance of the system, as it allows the extinguishing agent to effectively blanket the fire and interrupts the combustion process. This parameter also impacts the system's design and installation requirements, as well as maintenance practices necessary to ensure operational readiness in the event of a fire emergency.