Updated 2026-11-10
Fire Pump Testing: Weekly Churn, Annual Flow & What the Curve Means
A fire pump only matters on the worst day of your building’s life. Testing is how you know it will start and perform.
1.Run tests (churn)
The pump runs without flowing water to confirm it starts and operates. Diesel pumps are typically run weekly; electric pumps are often allowed a monthly run under recent editions of NFPA 25.
2.Annual flow test
Water is flowed at churn, rated capacity, and peak capacity. Pressure and flow readings are compared with the pump’s certified curve.
3.Reading the curve
If tested performance falls meaningfully below the original curve, the pump, impeller, or water supply may need attention.
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4.Controller and transfer switch
Testing confirms the controller starts the pump automatically and, where present, transfers to the alternate power source.
5.Diesel engine checks
Fuel level, batteries, cooling, and exhaust are checked. Diesel drivers have more failure points than electric motors.
6.Common findings
Packing leaks, low suction pressure, controller alarms, worn batteries, and relief valve issues are frequent findings.
If your fire pump has not had a documented annual flow test, schedule one. Insurers look for it.
General information only. Requirements depend on your building, occupancy, adopted code edition, and local Authority Having Jurisdiction (AHJ). Confirm specifics with your AHJ or a licensed fire protection contractor.