Final Answer:
The pressure reducing valve flow test of a standpipe system must be performed at least every 5 years.
Step-by-step explanation:
Standpipe systems are essential components of fire protection in buildings, providing a water supply for firefighting. The pressure reducing valve (PRV) flow test is a crucial maintenance procedure to ensure the proper functioning of the system. According to reference materials, this test should be conducted at least every 5 years.
During the PRV flow test, the system is evaluated for its ability to maintain consistent water pressure within the standpipe. This is essential for delivering sufficient water flow and pressure to firefighting hoses and nozzles. Regular testing helps identify and address any issues with the pressure reducing valve, ensuring the reliability and effectiveness of the standpipe system in emergency situations.