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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 /> t Pressure Distibution <br /> 3. a. Select number of perforated laterals Perforation Discharges in GPM <br /> b. Select perforation spacing= feet. Head Perforation diameter <br /> c. Subtract 2 ft. from the rock layer length. feet (inches) <br /> K...l IAycr Icngth <br /> -2 ft.= feet. 7/32 1/4 <br /> d. Determine the number of spaces between perforations. 1.0a 0.56 0.74 <br /> Length perf.spacing= ft.r ft.= spaces i 1.5 0.69 0.902.Ob 0.80 1.04 <br /> e. spaces+ 1 = _perforations/lateral a Use l.o foot single homes. <br /> f. Multiply perforations per lateral by number of laterals to ' b Use 2.0 feet for anything else. <br /> get total number of perforations. CfA , x 7,r.7== perforations. <br /> b' QTR ;Pr. 1m <br /> gpm. <br /> SELECTED PUMP CAPACITY 3pgpm <br /> $oil Ur atmcnt <br /> 13. Determine head requirements: <br /> 1. Elevation difference between pump and point of discharge. <br /> feet Total pipe length <br /> 2. if pumping to a pressure distribution system,five feet for pressure _a 11 <br /> required at manifold if gravity s sem,Zero. Inlet OG Elevation Ddferunce <br /> feet pipe o S <br /> 3. friction loss <br /> a. Enter friction loss table with gpm and pipe diameter. ... <br /> i►t ------------------------------------- <br /> G �P• Read friction loss i1 feet per 100 feet from table(F-14). <br /> F.L. = / 5 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 feet). ; pipe dia. <br /> Equivalent pipe length- 1.25 times pipength= Flow Rate 15" 2" 3" <br /> I O x 1.25= '.Z feet gpm <br /> Calculate total friction loss by multiplying <br /> friction loss in ft/100 ft by equivalent pipe length. 20 2.47 0.73 0.11 <br /> Total friction loss= Z 25- x /• Yee +100= 3• feet 25 3.73 1.11 0.16 <br /> 30 5.23 1.55 0.23 <br /> 4. Total head required is the sum of elevation difference, 35 6.96 2.06 0.30 <br /> special head requirements,and total friction loss. 40 8.91 2.6.1 0.39 <br /> 45 11.07 3.28 0.48 <br /> 3, 50 13.46 3.99 0.58 <br /> ,5- + 5 + - 55 4.76 0.70 <br /> (1) (2) (30 1 60 5.60 O.b2 <br /> 65 6.48 0.9E <br /> TOTAL HEAD feet 70 7.41 1.0c <br /> C. Pump selection <br /> 1. A pump must be selected to deliver at least <br /> 3o gpm (Step A) with at least 13..E feet of total head (Step B). <br />