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9 <br /> PUMP SELECTION PROCEDURE <br /> 4. Determine pump capacity: <br /> Gravity Distribution <br /> 1. Minimum suggested is 20 g m <br /> 2. Maximum suggested is 45 pm Perforation Discharges in GPM <br /> Pressure Distibution Head Perforation diameter <br /> (feet) (inches) <br /> 3.a. Select number of perforate laterals 7/32 1/4 <br /> b. Select perforation spacing= feet. 1.0a 0.56 0.74 <br /> c. Subtract 2 ft.from the rock ayer length. 1.5 0.69 0.90 <br /> 2.Ob 0.80 1.04 <br /> Rock layer length <br /> 2 ft. = eet. <br /> d. Determine the number of s aces between perforations. a Use 1.0 foot single homes. <br /> Length perf.spacing= ft._ ft. = spaces b Use 2.0 feet for anything else. <br /> e. spaces+1 = pe forations/lateral <br /> f. Multiply perforations per 1 teral by number of laterals to <br /> get total number of perforations. cra 5 x p r;m77 r= perforations. <br /> g. . x gpm pef = gpm. <br /> SELECTED PUN/It CAPACITY 7 7 gpm <br /> B.Determine head requirements: <br /> 1. Elevation difference between pump and point of discharge. <br /> feet <br /> 2. If pumping to a pressure di.tnbution system,five feet for pressure Soil treatment system <br /> required at manifold if gra ity system,zero. ilicgiill <br /> feet Total pipe length <br /> 3. Friction loss <br /> a. Enter friction loss table ith gpm and pipe diameter. l„le '. v Elevation Difference <br /> Read frictionoss in feet ter 100 feet from table(F-14). pip` F <br /> F.L. = Z.lc 1 ft./100 t of pipe <br /> b. Determine total pipe le gth from pump to discharge Pa # <br /> point. Estimate by add' g 25 percent to pipe length for fitting <br /> loss,or use a fitting loss hart(F-15 4 to feet). <br /> Equivalent pipe length 1.25 times pipe length= <br /> 40 1.25= SO feet Friction Loss in Plastic Pipe <br /> c. Calculate total friction l ss by multiplying <br /> friction loss in ft/100 ft • equivalent pipe length. Nominal <br /> Total friction loss= Z'tc , x cc o =100= i !1Z feet pipe dia. <br /> Flow Rate <br /> 4. Total head required is the slam of elevation difference, gpm 1.5" 2" 3" <br /> special head requirements;and total friction loss. <br /> J / f/Z 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 /�� 0.30 <br /> TOTAL HEAD / feet 11.0 64 0.48 <br /> 45 11.07 32 0.48 <br /> 50 13.46 3.99 0.58 <br /> 55 4.76 0.70 <br /> C. Pump selection 60 5.60 0.82 <br /> 65 6.48 0.95 <br /> 70 7.44 1.09 <br /> • <br /> 1. A pump must be selected to deliver at least <br /> 37 gpm (Step A) with at least /Z. feet of total head (Step B). <br />