What is the maximum allowable reduction in full flow pressure that must be identified and corrected?

The maximum allowable reduction in full flow pressure is specified as 10%. This standard is essential because it ensures that the fire protection system maintains adequate pressure for effective operation in the event of a fire. A reduction beyond this threshold could compromise the system's ability to deliver sufficient water to suppress a fire, increasing the risk to life and property.

In practice, maintaining pressure levels according to NFPA 25 is critical during inspections and testing. If pressure is found to be lower than the acceptable limit, it signals a need for immediate attention and corrective actions to restore proper functionality. This standard emphasizes the importance of regular maintenance and monitoring, as even slight variations can significantly affect the performance of fire protection systems. Thus, a 10% maximum reduction serves as a vital benchmark for ensuring reliable and effective fire protection.