Irrigation Professionals with questions about ... - Hunter Industries

(PUMP SYSTEMS)Design Capacity and Working PressureWorksheetCALCULATING DESIGN CAPACITY AND DYNAMIC PRESSUREA. Record Site Information1 Dynamic pressure at the discharge point PSI2 Pump available flow at discharge point GPM3 Net elevation change (discharge to POC) ± FEET (+uphill, - downhill)4 Pressure change due to elevation: Line 3 x 0.433 = PSI5 Pressure at POC: Line 1 +/- Line 4 = PSI6 Delivery Line7 Isolation Valves8 OtherNumber/Length Size TypeB. Determine Design Capacity GPM WithFactor Restriction Restriction9 Pump/Well GPM capacity Continuous supply available atdischarge point (Line 2)10 Pump Safety Factor Not to exceed 90% of continuous supplyavailable at discharge point x 0.10= GPMGPM11 Design Capacity (subtract Line 10 from Line 9) GPMC. Calculate Dynamic Pressure at Design CapacityPressure Losses from Discharge Point to the POC12 Pressure reduction 10% as Pump Safety Factor x 0.10 = PSI13 Pressure loss in the Delivery Line PSI loss (per 100' ) x ft./100 = PSI14 Pressure loss in the Isolation Valves: Equivalence factorxPSI loss per 100' ofstandard steel/100x Number of valves = PSI15 Other pressure losses_____________________________ = . PSI16 Pressure loss from the discharge point to POC (add Lines 12 through 15) PSI17 Approximate Dynamic Pressure at Design CapacityDynamic pressure at the POC (Line 5 above)PSISubtract the PSI lost from the discharge point to the POC (Line 16)PSIApproximate Dynamic Pressure at Design CapacityPSI