NFPA 25, Standard for the Inspection, Test and Maintenance of Water-Based Fire Protection Systems, establishes the minimum requirements for the periodic inspection, testing, and maintenance of water-based fire protection systems, including land-based and marine applications. The types of systems addressed by this standard include, but are not limited to, foam water spray and foam water sprinkler systems. NFPA 25 is intended to ensure a reasonable degree of protection for life and property from fire through minimum inspection, testing, and maintenance methods for water-based fire protection systems. Where a distinct hazard to life or property exists, the AHJ is permitted to require methods in excess of those required by the standard. NFPA 25 does not include those systems detailed in NFPA 11.
Depending on the specific equipment, devices are to be inspected at least annually. Inspection of proportioning equipment has priority, requiring monthly inspections, indicating the importance of proper foam concentration. Most of the foam equipment requires annual operational testing, to ensure that foam-water systems respond both automatically and manually as designed. Test procedures simulate anticipated emergencies so response can be evaluated. However, where system discharge can be hazardous or conflict with local requirements (such as environmental restrictions), alternate methods to match full flow conditions are permitted. Discharge time and patterns are to be noted, along with pressure readings and the foam concentration. Test details are provided for specific foam equipment such as standard and in-line balanced pressure proportioners and associated pumps.