When performing an annual flow test on a 1500 gpm steam turbine driven fire pump, which tool is needed for proper testing?

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

Answer: (C)

Reliable flow testing hinges on accurate pressure readings, and that accuracy comes from properly calibrated gauges. A Bourdon tube tester is used to calibrate pressure gauges by applying known pressures and comparing the gauge readings to a standard. By validating that the gauges respond correctly across the test range, you remove instrument error from the flow-test data, ensuring the reported flow and pressure relationship truly reflects the pump’s performance at 1500 gpm. The test results depend on trustworthy measurements, not just the act of measuring flow; calibrating the gauges with a Bourdon tube tester gives you confidence that the readings you use to assess the pump meet the required tolerances. While a flow meter directly measures flow, and a pressure gauge shows pressure, neither guarantees gauge accuracy without calibration, and a multimeter measures electrical values rather than hydraulic pressures.