20141016IES_Custom Pressure Regulators_Usage Savings.docx

E1 = annual kWh savings for pivot pressure regulator replacement
E2 = Estimated leak per regulator (0.4 gpm)
E3 = Number of regulators being replaced
E4 = Average operating pressure (68 psi)
E5 = Average lift from water surface to pump (5 feet for surface pumps and 219 feet for well pumps)
E6 = Average pumping plant efficiency (65% or 0.65)
E7 = Savings realization factor (0.8)
E8 = Average annual operating hours (1,158 hours)
Equation Constants
Conversion factor from psi to feet of head = 2.31
Conversion factor from hp to kW = 0.746
Units conversion factor for water horsepower calculation = 3,960