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07/09/2008 10: 37 952-955-5071 BURNS EXCAVATING PAGE 14 <br /> PUMP SELECTION PROCEDURE <br /> A. Pump capacity <br /> Already determined from PRESSURE DISTRIBUTION PAGE, line #7 <br /> Pump capacity = 42 GPMI <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 = �8 ] <br /> 2. If pumping to a pressure disttibution 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 42.0 and pipe diameter 2.0 <br /> FRICTIQN LOSS IN PLASTIC PIPE <br /> FLOW RA7E NOMINp,t, PIPE DIAMETER FLOW RATE NOMINA� 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 Z,06 0.30 <br /> 25 3_73 1,11 0.16 40 6.91 2.84 0,39 <br /> 30 5.23 1.55 0.23 45 11.07 3.2$ 0.48 <br /> Friction loss � 1,55 feet per 100 ft of pipe <br /> b. Determine total pipe length from pump t� discharge point = 60.0 <br /> Add 25% to pipe length above to accounfi fior fitting loss = 75,0 feet pipe <br /> c. Calculate total frictian loss by multiplying friction foss in ftJ100 83a by <br /> equivalent pipe length B3b above = <br /> 1.5� X 75.00 equals 116.25 / 100 = 1.2 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 3Bc. <br /> S.0 plus 5.0 plus 1.2 equals 14.2 ft total head <br /> D_ The Pump requires 42,0 gpm and 14.2 fi�et of head <br /> PAGE 9 OF 12 <br />