The annual full flow test verifies the complete operating condition of the pump. Three data points—Pump churn (0%), Rated capacity (100%), and Overload (150%)—are collected and plotted on a graph to assess the pump’s performance. Compare the pump’s flow test performance to the manufacturer’s data by plotting net pressure against capacity percentage. According to NFPA 25 (2011), the tested performance must meet at least 95% of the manufacturer’s requirements; poorer performance requires further investigation.
Additional Resource: NFPA 25