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-Z <br />To/,1 J M/ errA <br />'h' dFORz. o/H S r-15 <br />PUMP SELECTION PROCEDURE <br />A. Determine pump capacity: <br />1. Minimum suggested is 600 gallons per hour (10 ppm) - <br />to stay ahead of water use rate <br />2. Maximum suggested for deliver- to a drop box of a home <br />system is.2700 gallons per hou; (45 gpm) to prevent <br />buildup of pressure in drop box <br />3. Use value from design of pressure distribution system <br />SELECTED PUMP CAPACITY . . . . . . . . . . . . . . . . _ <br />�S S gpm <br />B. Determine head requirements: <br />1. Elevation difference between pump and point of discharge <br />5 f feet <br />2. If pumping to a pressure distribution system, add 5 feet <br />for pressure requited at manifold . . . . . . . . . . <br />.S feet <br />3. Friction loss <br />_ <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. = 7. /'j ft/100 ft <br />b. Determine total pipe length from pump to discharge <br />point. Add 25 percent to pipe lei .:tlh for fitting <br />loss, or use a fitting loss chart. Equivalent pipe <br />lengt'o - 1.25 times pipe length = 1.25 x / 50 <br />S feet <br />_f�1; <br />c. Calculate total friction loss by multiplying; <br />friction loss in ft/100 ft by equivalent pine <br />length. <br />'total friction loss = 7. /y Y. /.F73' •- <br />Y feet <br />_�_�_ <br />4. Total head required is the sum of elevation difference, <br />special head requirements, and total friction loss. <br />S + + 5 + <br />TOTAL HFAD . . . . . . . . . . . . . . . . . . . . . . <br />z �. Y t f ec t <br />C. Pump selection <br />I. A pump must be selected'Eo deliver at least ? S. S gpm <br />with at least 27.11 ! feet of total head. <br />D. To maximize pump life select sump size for 4 to 5 r,^rp <br />t:perations per day. <br />Calculate drainback <br />1. Determine total pipe l.eng'.h, feet. <br />2. Determine liquid volume r:j pipe, gallons per <br />100 feet. (See page E-18) <br />3. Mnitip,'.y length by volv.iie: Drainbac. antity = <br />feet x gallons/100 ft = gallons <br />A. Suggested drainback _ --tity is 10 percent of pumped quantity. <br />A larger drainback pe ;rare will decrease r.—P station <br />efficiency -slightly but pumping energy costs a.e usually a <br />relatively small part of the tucal householc: ;r^.y costs. <br />