PUMP SIZING Required Flow 25.2gpm at 15psi Pressure loss through filter at 25.2gpm = 19psi Pressure loss through 100' of 1-1/4 pipe at 25.2gpm = 3.5psi Pressure loss through fittings (estimate) at 25.2gpm = 1.5psi Pressure loss at 7.5' elevation from pump to field = 3.2psi Total Pressure loss = 27.2psi Required Inlet Pressure 15psi + 27.2psi = 42.2psi Pump must produce 25.2gpm at 42.2psi Required Flow 15.6gpm at 17psi Pressure loss through filter at 15.6gpm = 7.5psi Pressure loss through 100' of 1 pipe at 15.6gpm = 5.4psi Pressure loss through fittings (estimate) at 15.6gpm = 1.5psi Pressure loss at 7.5' elevation from pump to field = 3.2psi Total Pressure loss = 17.6psi Required Inlet Pressure 17psi + 17.6psi = 34.6psi Pump must produce 15.6gpm at 34.6psi Required Flow 12.4gpm at 25psi Pressure loss through filter at 12.4gpm = 5psi Pressure loss through 100' of 1 pipe at 12.4gpm = 3.6psi Pressure loss through fittings (estimate) at 12.4gpm = 1.5psi Pressure loss at 7.5' elevation from pump to field = 3.2psi Total Pressure loss = 13.3psi Required Inlet Pressure 25psi + 13.3psi = 38.3psi Pump must produce 12.4gpm at 38.3psi Friction loss factors: Rate of flow through piping(size and length), fittings, filters, zone valves, control valves, and changes in elevation
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