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YAWS <br />r?� :'. F-15 <br />PUMP SELECTIL" PROCEDURE <br />A. Determine pump capacity: <br />1. Minimum suggested is 600 gallons per hour (10 gpm) - <br />to stay ahead of water use rate <br />2. Maximum suggested for delivery to a drop box of a home <br />system is 2700 gallons per hour (45 qpm) to prevent <br />buildup of pressure in drop box <br />3. Use value from design of pressure distribution system <br />SELECTED PUMP CAPACITY . . . . .. . . . . . . . . . . . fir- S Rpm , <br />B. Determine head requirements: <br />1. <br />Llevation difference between pump and point of discharge <br />_ feet <br />2. <br />If pt-rping to a pressure distribution system. add 5 feet <br />for pressure required at manifold . . . . . . . . . . <br />S feet <br />3. <br />Friction loss <br />a. Enter friction loss table with gpm and pipe diameter. <br />Read friction loss in feet per 100 feet from page F-18. <br />F. L. = i, / ft/100 ft <br />b. Determine total pipe length from pump to discharge <br />point. Add 25 percent to pipe length for fitting <br />loss, or use a fitting lotin chart. Equivalent pipe <br />2�� feet <br />lrnl"lII - .."I t t^It... I•il)r Ionr0i - 1 35 :: �U�O' _._ <br />C. Calculatt• tt,tal it•it•tioll ltl;:,: by unlltiplyin1; <br />frictiun IOSS In ft/100 ft by equivalent pine <br />Ivilgth . <br />Total friction loss %_/i -.x 7G0 <br />• feet <br />t. <br />_ <br />Total head rt•nttired i,: the sum of elevation difference, <br />special head r.quirements, and total friction loss. <br />+ S +_Zy. J— <br />TOTAL HEAD . . . . . . . . . . . . . . . . . . . . . . <br />17, 3 feet <br />C. Pump selection <br />1. A pump must be selecte to deliver at least gpm <br />with at least _ 2*;*. 3 feet of total head. <br />D. To maximize pump life select sump size for 4 to 5 pump <br />operations per day. <br />I'. CalcuLate drainback <br />L. Determine total pipe length, /6l) feet. <br />2. Determine liquid volume of pipe. gallons per <br />100 feet. (See page E-18) <br />3. Mult:ynl}• length by volume: Drainback quantity <br />fee:: x /J, S,.. gallons/100 ft 16', ? gallons <br />Suggested drainback quauti.y is 10 percent of pumped quantity. <br />A larger drainback percentage will decrease pump station <br />efficiency slightly but pumping energy costs are usually a <br />relatively small parr of the total household energy costs. <br />