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PUMP SELECTION PROCEDURE <br /> A. Determine pump capacity: <br /> Gravity Distribution <br /> 1. Minimum suggested is 20 gpm <br /> 2. Maximum suggested is 45 gpm <br /> Pressure Distibution <br /> 3.a. Select number of perforated laterals 2 Perforation Discharges in GPM <br /> b. Select perforation spacing= 3 feet. <br /> c. Subtract 2 ft. from the rock layer length. Head Perforation diameter <br /> y g (feet) (inches) <br /> -3 $' -2 ft. = 3 4- feet. 7/32 1/4 <br /> Rock lays ength <br /> d. Determine the number of spaces betweenperforations. <br /> l.oa 0.56 0. 4 <br /> Length perf. spacing=SC ft.+ 3 ft. = 1 spaces 1s 0.80 0.04 <br /> e. IP. spaces + 1 =. f perforations/lateral 2.ob o.80 1.04 <br /> f. Multiply perforations per lateral by number f laterals to a Use 1.0 foot single homes. <br /> et total number of perforations. x _ perforations. <br /> b Use 2.0 feet for anything else. <br /> 7 laterals per/s/ateral <br /> g. G x .._ Cgpm. <br /> SELEt_1'ED PUMP CAPACITY •ZO gpm <br /> B.Determine head requirements: <br /> Soil treatment system <br /> 1. Elevation difference between pump and point of discharge. . . <br /> 4 feet Total pipe length <br /> 2. If pumping to a pressure distribution system,five feet for pressure <br /> required at manifold if gravitysystem,zero. <br /> �j" Wet iii'feet Elevation Difference <br /> pipe3. Friction loss <br /> a. Enter friction loss table with gpm and pipe diameter.Read friction loss in feet per 100 feet from table(F-14). <br /> F.L. = e 73 ft./100 ft of pipe <br /> b. Determine total pipe length from pump to discharge Friction Loss in Plastic Pipe <br /> point. Estimate by adding 25 percent to pipe length for fitting Nominal <br /> loss,or use a fitting loss chart(F-15 R0 feet). pipe dia. <br /> Equivalent pipe length- 1.25 times pipe length= Flow Rate <br /> Z 0 x 1.25 = 2 S feet gpm 1.5" 2" 3" <br /> c. Calculate total friction loss by multiplying <br /> friction loss in ft/100 ft li)y equivalent ipe length. 20 2.47 0.73 0.11 <br /> Total friction loss = . 7 3 x X +100 = I feet 25 3.73 1.11 0.16 <br /> 4. Total head required is the sum of elevation difference, 30 5.23 1.55 0.23 <br /> 35 6.96 2.06 0.30 <br /> special head requirements,and total friction loss. 40 8.91 2.64 0.39 <br /> q 45 11.07 3.28 0.48 <br /> t + lc + 1 50 13.46 3.99 0.58 <br /> (1) (2) (3c) 55 4.76 0.70 <br /> 60 5.60 0.82 <br /> r 65 6.48 0.95 <br /> TOTAL HEAD /-) feet 70 7.44 1.09 <br /> C. Pump selection <br /> 1. A pump must be selected to deliver at least <br /> 0 gpm (Step A) with at least /S. feet of total head (Step B). <br />