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F-15 <br />PUMP SELECTION PROCEDURE <br />A. Determine pump capacity: <br />I. <br />Minimum suggested is 600 gallons per hour (10 rpm) - <br />to stay ahead of water use rate <br />2. <br />Maximum suggested for delivery to a drop box of :i home <br />system is.2700 gallons per hour (45 gpm) to prevent <br />buildup of pressure in drop box <br />3. <br />Use value from design of pressure distribution system <br />k l^. <br />SELECTED PUMP CAPACITY . . . . . . . . . . . . . . . . <br />B. Determine head requirements: <br />:= <br />1. <br />Elevation difference between pump and point' of di.SC:lI:JI't;C <br />c- r <br />.. IeQC <br />?. <br />w' <br />If pumping to a pressure distribution system, add 5 feer <br />•J - <br />for pressure required at manifold . . . . . . . . . . <br />;. <br />Friction loss <br />- <br />a. Enter friction loss table with f•pm and pipe 11i.i:11CLu •. <br />Read friction loss in feet per 100 fuc:t fVUM page <br />F. L. - 7 /y ft/100 ft <br />b. Determine total pipe length from pump to dischare- <br />' <br />point. Add 25 percent to pipe length for fitting. <br />loss, or use a fitting loss chart. Equivalent Iiipo <br />length - 1.25 times pipe length = 1.2,) :: /� t7 <br />% `.' :,•.:: <br />''. <br />c. Calculate t friction loss by mui;��- <br />`' <br />friction lof.a 'n ft/'i )0 ft by equivalent pine <br />length. <br />`- <br />Total friction loss: - 141Z�: x <br />4. <br />`%• <br />Total head required is the sum of elbvation difference. <br />special head requirements, and total friction <br />M <br />• _ s* + S _+-8•y— <br />TOTAL HEAD . . . . . . . . . . . . . . . . . . . . . . <br />eat <br />C. Pump selection <br />1. p •mp must be selected to deliver at least 357. S &pm. <br />with 4t least /8. 9 feet of total hand.. <br />D. To maximize pump life select sump size for 4 to 5 pump <br />operations per day. <br />M.. Calculate drainback <br />Y <br />1. Determine total pipe length, feet. <br />2. Determine liquid volume of pipe, gallon:. or <br />_ _ <br />100 feet. (See page E-18) <br />3. Multiply length by volume: Drainback qu:u,Cit; <br />feet x gallons/100 ft t,,allun:: <br />4. Suggested drainback quantity is 10 py.rcent of puunpod quuntIt% <br />A larger drainback percentuf;e will deer.•:1sc pump ::L..Liun <br />efficiency slightly but pumping energy costs are u:.<<:�11y <br />relatively small part of the total hc,ua:ellold encrcu costu. <br />