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K-15 <br />PUMP SEl.KCTlOtl !>R0':K!)'JP.!-: <br />A. DcCt^rmiiu; pump capacity: <br />1 . <br />2. <br />i. <br />Minimiiw sugRCsCc-il is 600 gal Ions pi:r liour (10 gpin) <br />to Htav ahead of water u::e rate <br />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 dro|) box <br />Use value from design of pressure distribution system <br />SEl.ECTED PUMP CAPACITY 3^.5 gpm <br />O feet <br />5 feet <br />B. Determine head requirements: <br />1. Elevation difference between pump and point of discharge - - <br />2. If pumping to a pressure distribution system, add 5 feet <br />for pressure required at manifold . . . . . . . . . . . . . . . <br />3. Friction loss <br />a. Enter friction loss table with gpni and pipe diameter. <br />Read friction loss in feet par 100 feet from page F-18. <br />F. L. = 96 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 = 1.25 x 7^_ _“- - -O <5L <br />c. Calculate total friction loss by multiplying <br />friction loss in ft/IOO ft 1>V equivalent pine <br />Total friction loss = x _ _ _“ - - - - - - - -.Cr../- <br />Total head required is the sum of elevation dilference, <br />speci.il head requirements, and total friction loss. <br />O + 5_ _ _ + / <br />feet <br /><•. <br />TOTAL DEAD <br />C. Pump selection <br />//. / feet <br />1.A pump must be selected to deliver at least _7.5'. <br />with at least //. / ft-ot of total head. <br />gpm <br />D.To maximize pump life select sump size for 4 to 5 pump <br />operations per day. <br />E. Calculate drainback <br />I . <br />2. <br />3. <br />f eet. <br />gallons per <br />Determine total pipe length, _ _ _ _ _ <br />Determine liquid volume of pipe, _ _ <br />100 feet. (See page E-18) <br />Multiply length by volume: Drainback quantity = <br />feet X gallons/100 ft =_ _ _ _ _ _ _gallons <br />Suggested drainback qu.antity is 10 percent of pumped quantity. <br />A larger drainback percentage will decrease pump station <br />efficiency slightly but pumping energy costs arc usually a <br />relatively small part of the total household energy costs.