In determining pump efficiency, what common denominator is used for calculations?

In determining pump efficiency, the common denominator used for calculations is 3957. This figure derives from the relationship between horsepower, flow rate, and the weight of water, and it serves as a conversion factor that aligns these units properly when calculating efficiency.

Pump efficiency is typically expressed as a percentage, which involves comparing the actual output of the pump to the theoretical maximum output. The efficiency calculation considers power input and output, with flow rate measured in gallons per minute (GPM) and head measured in feet. The factor of 3957 connects these various measurements to help accurately assess performance.

Using this factor helps maintain consistency across calculations involving different flow rates and pressure heads when evaluating how efficiently a pump operates in converting electrical power to hydraulic energy. Thus, for pump calculations, employing the figure of 3957 provides a reliable basis for determining performance and diagnosing operational issues.