NFPA 1911 requires service testing for an MWS apparatus equipped with a fire pump at least how often?

• A. Daily
• B. Weekly
• C. Monthly
• D. At Least Once a Year Or After Extensive Pump Repair

Answer: (D)

NFPA 1911 sets how often a fire pump on an MWS unit must be tested for service. The minimum is once a year, and it also requires a test after extensive pump repair to confirm the pump still meets performance standards. This annual test helps ensure the pump delivers its rated pressure and flow reliably in service, while testing after major repairs catches any issues introduced during maintenance. Daily, weekly, or monthly service testing isn't mandated for this purpose by NFPA 1911. The clause about extensive pump repair covers major work like a rebuild or replacement of key components, which necessitates re-verification of pump performance.