NFPA 25 (2011), Standard for the Inspection, Testing, and Maintenance of Water-Based Fire Protection Systems, specifies that a fire pump flow test must be performed annually. This ensures that the pump delivers adequate flow and pressure under actual operating conditions. Weekly no-flow (churn) tests are also required, but full-flow condition testing is mandated at least once per year.
[Reference: NFPA 25 (2011), Section 8.3.3., , ===========, ]
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