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PUMP SELECTION PROCEDURE <br /> A. Pump capacity <br /> Already determined from PRESSURE DISTRIBUTION PAGE, line #7 <br /> Pump capacity = 58 GPM <br /> Pump capacity should be between 20 and 40 GPM for charging a manifold <br /> or for pumping to a gravity situation, ie, a drop box or distribution box. <br /> B. Determine head requirements <br /> 1. Elevation difference between pump and the point of discharge <br /> 2. If pumping to a pressure distribution-system, add 5 feet of head required at the <br /> manifold. If pumping to a gravity system, use zero (0) feet of head. <br /> 3. Determine friction loss <br /> a. Enter friction loss table with gpm 58 and pipe diameter 2.00 <br /> FRICTION LOSS IN PLASTIC PIPE <br /> FLOW RATE NOMINAL PIPE DIAMETER FLOW RATE NOMINAL PIPE DIAMETER <br /> IN GPM 1.5 2 3 IN GPM 1.5 2 3 <br /> 20 2.47 0.73 0.11 35 6.96 2.06 0.30 <br /> 25 3.73 1.11 0.16 40 8.91 2.64 0.39 <br /> 30 5.23 1.55 0.23 45 11.07 3.28 0.48 <br /> Friction loss = 3.68 feet per 100 ft of pipe. <br /> b. Determine total pipe length from pump to discharge point = 185.0 <br /> Add 25% to pipe length above to account for fitting loss = 231.3 feet pipe <br /> c. Calculate total friction loss by multiplying friction loss in ft/100 63a by <br /> equivalent pipe length 133b above = <br /> 3.68 X 231.25 equals 851.00 1100 = 8.5 ft head <br /> C. Total head required is the sum of the elevation difference B1 plus additional pressure <br /> for the manifold B2 plus the total friction loss 313c. <br /> 9.4 plus 5.0 plus 8.5 equals 22.9 ft total head <br /> D. The Pump requires 58 gpm and 23 feet of head <br />