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ram J-Al / f r A <br />y BEORooiKS r•-15 <br />PUMP SELECTION PROCEDURE <br />A. Determine pump capacity: <br />1. Minimum suggested is 600 gallons per hour (10 Rpm) - <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 from design of pressure distribution system <br />SELECTED PUMP CAPACITY . . . . . . . . . . . . . . . . ,�s .S 9PM <br />B. Determine head requirements: <br />1. <br />Elevation difference between pump and point of discharge <br />_ _,5_ feet <br />2. <br />If pumping to a pressure distribution system, add 5 feet <br />S <br />for pressure required at manifold . . . . . . . . . . <br />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. - ? 1Y f t/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 - 1.25 x 150 <br />feet <br />c. Calculate total friction loss by multiplying <br />friction loss in ft/100 ft by equivalent pipe <br />length. <br />'total friction loss 7. /y x /. F71 = <br />_/_�, `/ _ feet <br />4. <br />Total head required is the sum of elevation difference, <br />special head requirements, and total friction loss. <br />.S + + s + _/.?. Y <br />Z 3J Y t feet <br />TOTAL HEAD . . . . . . . . . . . . . . . . . . . . . . <br />_ <br />C. Pump selection <br />1. A pump must be selected to deliver at '_east .75. 5 gpm <br />with at least 2 3.4V $' 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 />1. Determine total pipe length. feel. <br />2. Determine liquid volume of pipe, g::llons per <br />100 feet. (See page E-18) <br />3. Multiply length by volume: Drainback quantity = <br />feet x gallons/100 ft - gallons <br />4. Suggested drainback quantity is 10 percent of . ,ed quantity. <br />A larger drainback percentage will decrease g•. -.•tion <br />efficiency -slightly but pumping energy costs a I•ly a <br />relatively small part of the total household c• <br />tests. <br />