How frequently should sprinkler systems be inspected according to NFPA 25?

According to NFPA 25, which is the standard for the inspection, testing, and maintenance of water-based fire protection systems, sprinkler systems are required to undergo a comprehensive inspection once a year. This annual inspection is critical for ensuring that the systems perform reliably in the event of a fire.

The rationale behind this requirement is to ensure that any changes or conditions that could affect the performance of the sprinkler system are identified and addressed in a timely manner. Annual inspections typically cover visual inspections of the sprinkler heads, valves, control systems, and any other components to check for signs of corrosion, physical damage, or obstructions.

Inspections that occur more frequently, such as monthly or quarterly, may be applicable to certain components or operational checks but do not encompass the full assessment needed for a complete understanding of the system's condition and readiness. Bianually inspections would also not meet the standard's recommendation for annual checks, thereby potentially compromising the effectiveness of the fire protection system. Therefore, the annual requirement established by NFPA 25 is essential for maintaining the operational integrity and reliability of sprinkler systems in protecting life and property from fire hazards.