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/ <br />PU>(P SELECTION PROCEDURE <br />Dtccrnin* pump capacity: <br />1. <br />2. <br />3. <br />MlnlwiB s<i(gc«ted Is 600 gallons par hour (10 spn) - <br />to stay ahaad of water uae rate <br />Msxlsw* suggastsd for dtlivsry to a drop box of a hoas <br />1» 2700 gallons per hour (iS gpn) to prevent <br />buildup of pressure in drop box <br />Use value from design of pressure distribution system <br />SELECTED PUMP CAPACITY <br />B. Determine head requirements: <br />Elevation difference between pump and point of discharcc /C faer <br />If pumping to a pressure distribution system, add Tfce^- - <br />for pressure required at manifold . . . . . . , <br />Friction loss . . . . . . . . <br />a. Enter friction loss table with gpm and pipe diameter <br />Read friction^l^ss f«cc from page F-ia. <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 ___/ 7^ - 2/7 ST <br />Calculate total friction loss by multlplylnn —— <br />friction lo.ss in fc/lOO ft by equivalent pine <br />length. <br />Total friction loss - 7,/Y **.. x lU.S <br />Total head required is the sum of elevation difference, <br />special head requirements, and total friction loss. <br />fS + s + /5. ^ <br />TOTAL HEAD . . . . . . . . . . . . . . . . . . . . . . . . . <br />C. Pump selection <br />1. A pump must be wlect^d to deliver at least W/ ^ <br />with at least 3Sx Z> feet of total head. * ' <br />D. To cacinize punp life select sump size for 4 to 5 pump <br />operations per day. <br />K. Calculate drainbnek <br />ys* 2_ feet <br />2. feet <br />gpn <br />Determine total pipe length. * /O feet. <br />Multiply length by volume: Dralnback quantity - <br />—77 0 feet X gallons/lOO ft - /2. 0 gallons <br />Suggested dralnback quantity is 10 percent of pumped quantity. <br />A larger dralnback percentage will decrease pump station <br />efficiency slightly but pumping energy costs are usually ■ <br />relatively small part of the total household energy costs.