Which instrument is used for the annual flow test on a 1500 gpm pump?

• A. Bourdon tube tester
• B. Multimeter
• C. Flow meter
• D. Pressure gauge

Answer: (A)

The key idea is that the annual flow test checks how much water the pump can actually deliver, so you need a device that directly measures flow rate. A flow meter provides a direct reading of gallons per minute in the discharge line, allowing you to verify whether the pump meets the 1500 gpm requirement and to document the performance accurately.

A Bourdon tube tester is used for evaluating the accuracy of pressure gauges by applying known pressures; it doesn’t measure flow. A multimeter is for electrical measurements, not flow, and a pressure gauge alone only tells you pressure, not how much water is moving. Therefore, the instrument that directly yields the required flow rate is the flow meter.