A pump performance test is usually conducted with the pump mounted on the floor above a large pit or sump filled with water. The pump draws water by suction from the sump, the flow passes through instrumentation that can measure the flow and pressure, and then the flow is returned back to the sump. The test loop has a throttling valve to allow variation of the flow, so that the pump can be run over its full performancerange. Finally, the test facility has the capability to measure brake horsepower, which is the power required by the pump (Volk, 2005).