System valve internal inspection is required every how many years for alarm valves, strainers, filters, and check valves?

System valve internal inspection is required every how many years for alarm valves, strainers, filters, and check valves?

• A. 3 years
• B. 5 years
• C. 1 year
• D. 10 years

Answer: (B)

The five-year interval is the standard for internal inspection of these system components. Over years, sediment can build up, seals can wear, and moving parts may corrode or stick, so inspecting the interior helps confirm that alarm valves operate properly, strainers and filters are not clogged, and check valves seat and hold as they should. This maintenance timing is what NFPA 25 uses to balance reliability with practical service frequency. If you inspect more often, you may spend unnecessary labor; less often, you risk undetected degradation that could impair system performance.

The five-year interval is the standard for internal inspection of these system components. Over years, sediment can build up, seals can wear, and moving parts may corrode or stick, so inspecting the interior helps confirm that alarm valves operate properly, strainers and filters are not clogged, and check valves seat and hold as they should. This maintenance timing is what NFPA 25 uses to balance reliability with practical service frequency. If you inspect more often, you may spend unnecessary labor; less often, you risk undetected degradation that could impair system performance.