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%v/r JAEi�rNQ,��►t <br />F-15 <br />PUMP SELECTION 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 rpm) to prevent <br />buildup of pressure in drop box <br />3. Use value fro.: desig- of pressure distribution system <br />SELECTED PUMP CAPACITY . . . . . . . . . . . . . . . . _ 1 60 6 gpm <br />Determine head requirements: <br />1. <br />Elevation difference betwP2-a pump and point of discharge <br />�0 feet <br />2. <br />_ <br />If pumping to a pressure distribution system, add 5 feet <br />_f <br />for pressure required at manifold . . . . . . . . . . <br />S feet <br />3. <br />Friction loss --" <br />-'-"— <br />a. Enter friction losq table with gpm and pipe diameter. <br />Read friction loss �:t feet per 1n0 feet from page F-18. <br />F. L. _ �/. J3 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; loss chart. Equivalent pipe <br />length = 1.25 times pipe length = .1.2.5 x , ' = <br />?06 t feet <br />_ <br />C. Calculate total friction loss by multiplying; <br />friction loss 1n ft/100 ft by equivalent pine <br />length. <br />Total friction loss = 5/ U3�1rnx ZO(J t <br />/_� feet <br />4. <br />_�'. <br />Total head required is the sum of elevation difference. <br />special head requirements, and total friction loss. <br />IO F + S + ��t <br />TOTAL HEAD . . . . . . . . . . . . . . . . . . . . . . <br />24 / * feet <br />C. Pump selection <br />1. <br />A pump must be selected to deliver at least Z C. c gpm <br />with at least Z 3 �f feet of total head. <br />D. To <br />maximize pump life select sump size for 4 to 5 pump <br />operations per day. <br />1?. Calculate drainback <br />1. Determine total pipe length, feet. <br />2. Determine liquid volume of pipe, _ gallons per <br />100 feet. (See page E-18) <br />3. Multiply length by volume: Drainback quantity = <br />_ feet x gallons/100 ft = galluns <br />4. Suggested drainback quantity is 10 percent of pumped quantity. <br />A larger drainback percentage will decrease pump station <br />efficiency slightly but pumping enemy costs are usually a <br />relatively small part of the total household energy costs. <br />