To compare pump sizes effectively, start by identifying the smallest pump that satisfies the necessary flow rate and pressure requirements, establishing this as your baseline. Next, calculate the air consumption (SCFM) for this baseline pump and two subsequent larger pump options.
These SCFM figures can then be translated into electricity savings using an estimate of 4.5 SCFM per horsepower and 0.746 kW per horsepower.
An important additional benefit of selecting larger pumps is the slower cycling rate for the same flow, which increases the mean time between diaphragm failures, leading to further maintenance savings.