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Fift/1G6Q �t'ErioF,�cE <br />S Bfpi�vo�f� s F-15 <br />PUMP SELECTION PROCEDURE <br />Determine pump capacity: <br />I. 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 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 />Y8, 8 gpm <br />13. Determine head requirements: <br />1. Elevation difference between pump and point of discharge <br />*feet <br />2. If pumping to a pressure distribution system, add 5 feet <br />_ ,� <br />for pressure required 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. = /2..9, ft/100 ft <br />b. Determine total pipe length from pump to discharge <br />point. Acid 25 percent to pipe length for fitting <br />loss, or use a fitting loss chart. Fquivalent p,pe <br />length = 1.25 times pipe lenp.th = .1.25 x _ <br />/ / 9 feet <br />C. Calculate total friction loss by r,ultiplyini; <br />friction loss In ft/.too ft by equ•,valent pipe <br />length. <br />Total friction loss = �1. 9 FE/�c�x .��_ _ <br />�9 <br />�s ,� feet <br />_ <br />4. Total head required is the tium of elevation difference. <br />special head requirements, and total friction loss. <br />3 + S + �.s : 3 <br />TOTAL HEAD . . . . . . . . . . . . . . . . . . . . . . �._ feet <br />C. Pump selection <br />y <br />1. A pump must be selected to deliver at least Yoe. a gpm <br />with at least ,23. 3feet of total head. <br />D. fo maximize pump life select sump size for 4 to 5 pump <br />operations per day. <br />F. Calculate drainback <br />1. Determine total pipe length, /J90 feet. <br />2. Determine liquid volume of pipe, ,j6p„3'g gallons per <br />100 feet. (See page 1;-18) <br />3. Multiply length by volume: Drainback quantity = <br />T�4?40.^ feet x 4W.S4? gallons/100 ft f itallons <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 energy costs are usually a <br />relatively small part of the total household energy costs. <br />