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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 /> Perforation Discharges in GPM <br /> Pressure Distib ution Head Perforation diameter <br /> es <br /> 3. a. Select number of perforated laterals J (feet) 7/32`r"!' <br /> dip <br /> b. Select perforation spacing = 3 feet. to, 0.56 CP) <br /> c. Subtract 2 ft. from the rock layer length. 1.5 0.69 , I.•1 <br /> j41? t <br /> -2 ft. = YS- feet. 2.0b 0.80 1.04 <br /> d. Determine the number of spaces betweenrforations. <br /> l� a Use I.0 foot single homes. <br /> Length perf.spacing='Vie ft. + _ft. =_ILe spaces b Use 2.0 feet for anything else. <br /> e. 16/ spaces+1 = 1 7 perforations/lateral <br /> f. Multiply perforations per lateral by.,number of laterals to <br /> get total number of perforations. x w _ r = 5/ perforations. <br /> g. <br /> / x.'7 =3B' gpm. <br /> SELECTED PUMP CAPACITY 3 g gpm <br /> B.Determine head requirements: <br /> 1. Elevation difference between pump and point of discharge. <br /> R feet <br /> 2. if pumping to a pressure distribution system, five feet for pressure Sod oor •rwean <br /> required at manifold if gravity system, zero. '''''.7 :1 <br /> :J feet ToU,pip.length <br /> 3. Friction loss <br /> a. Enter friction loss table with gpm and pipe diameter. ,,,i. ii Ek.•.ennDJrae� <br /> Read friction loss in feet per 100 feet from table(F-14). P'P" c <br /> F.L. = �.6 ' ft./100 ft of pipe <br /> b. Determine total pipe length from pump to discharge 4 <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 pipe length= <br /> .S() x 1.25= (,t. 3 feet <br /> -c. Calculate total friction loss by multiplying Friction Loss in Plastic Pipe <br /> friction loss in ft/100 ft ay equivalent ipe length. Nominal <br /> Total friction loss= .6 x e +100= off- feet pipe dia. <br /> 4. Total head required is the sum of elevation difference, Flow Rate 1.5" 3„ <br /> special t ead requirements,and total fnchon loss. <br /> gpm <br /> + 5 + 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%.. 0.30 <br /> TOTAL HEAD / 5 feet 40 8.91 X328 0.39 <br /> 45 11.07 3.28 0.48 <br /> 50 13.46 3.99 0.58 <br /> C. Pump self ction 55 4.76 0.70 <br /> 60 5.60 0.82 <br /> 65 6.48 0.95 <br /> 70 7.44 1.09 <br /> 1. A pump must be selected to deliver at least <br /> 3g .gpm (Step A) with at least f feet of total head (Step B). <br /> 4 <br />