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. � . . . . 9 <br /> PUMP SELECTION PROCEDURE <br /> A. Determine pump capacity: <br /> Gravity Distribution <br /> 1. Minunum suggested is 20 gpm <br /> 2. Maximum suggested is 45 gpm Perfotation Discharges in GPM <br /> Head Perforation diameter <br /> Pressure Distibution feet inches <br /> 3.a. Select number of perforaked laterals 7/32 i/4 <br /> b. Select perforation spacing= feet. 1.oa o.56 o.7a <br /> c. Subtract 2 ft. from the rock layer length. 1.5 0.69 0.90 <br /> Rock layer Iengtl� <br /> -2 ft. = feet. 2.ob o.so 1.04 <br /> d. Determine the number of spaces between perforations. a Use i.o foot single homes. <br /> Length perf.spacing= ft.= ft. = spaces b use z.o feet Eor anything e1se. <br /> e. spaces+1 = perforations/lateral <br /> f. Multiply perforations per lateral by number of laterals to <br /> get total number of perforations. rT.t.e�T. x ��5���= perforations. <br /> C' peT X gpm per $Pm• � . <br /> SELECTED PUMP CAPACITY y� 2 gpm <br /> B.Determine head requirements: <br /> 1. Elevation difference between p p and point of discharge. <br /> _�feet <br /> 2. If pumping to a pressure distribution system,five feet for pressure 5°��,a�,�^�Srs«, <br /> required at manifold if gravity system,zero. a'°:'°�"a' <br /> .�� feet ToW plpe length <br /> 3. Friction loss <br /> a. Enter friction loss table with gpm and pipe diameter. � ..�- ElevationDifEerence <br /> Read friction loss in feet per 100 feet from table(F-14). P'� <br /> ------- -- - <br /> F.L._"3•2 ft./100 ft of pipe <br /> ................. . . <br /> b. Determine total pipe length from pump to discharge "-------'""""-'"-"---'-'"'-"'""--' <br /> point. Estimate by adding 25 percent to pipe length for fitting <br /> loss,or use a fitting loss chart(F-15 feet). <br /> Equivalent pipe length-1.25 times pi e length= <br /> ��x 125=�_feet Friction Loss in Plastic Pipe <br /> c. Calculate total friction loss by multiplying <br /> frichon loss in ft/100 by equivalent ipe length� Nominal <br /> pipe dia. <br /> Total friction loss= x 3• 2 =100= feet �ow Rate <br /> 4. Total head required is the sum of elevation difference, �m 1.5" 2" 3" <br /> special head requirements,and total friction loss. <br /> 4 + �`+_� 20 2.47 0.73 0.11 <br /> 25 3.73 1.11 0.16 <br /> (1) (2) (3c) 30 5.23 1.55 0.23 <br /> 35 6.96 2.�6 0.30 <br /> 8.91 0.39 <br /> TOTAL HEAD � feet 45 11.07 3.28 0.48 <br /> 13.46 0.58 <br /> C. Pump selection bo 5.bo o.s2 <br /> 65 6.48 0.95 <br /> 70 7.44 1.09 <br /> _ / /L 1. A pump must be selected to deliver at least <br /> `��i gpm (Step A) with at least � feet of total head (Step B). <br />