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• <br /> 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 Perforation Discharges in GPM <br /> Head Perforation diameter <br /> Pressure Distibution (feet) (inches) <br /> 3. a. Select number of perforated laterals 7/32 1/4 <br /> b. Select perforation spacing= feet. 1.oa 0.56' 0.74 <br /> c. Subtract 2 ft from the rock layer length. 1.5 0.69 0.90 <br /> �i l -2 ft._ / feet. 2.0b 0.80 1.04 <br /> RadeIay+r)sr d <br /> d. Determine the number of spaces between perforations. a Use 1.0 foot single homes. <br /> Length perf.spacing is ft+.;;;;_.ft Is _spaces b Use 2.0 feet for anything else. <br /> e. 1'_' spaces+1 = )`i perforations/lateral <br /> f. Multiply perforations per lateral by_ number of laterals to 1),1 <br /> get total number of perforations. x . _ �1"L- perforations. <br /> g. X •� ' ...._2_.gpm. <br /> SELECTED PUMP CAPACITY , ' 1 gpm <br /> B.Determine head requirements: <br /> 1. Elevation difference between pump and point of discharge. <br /> _Q_____feet <br /> 2. If pumping to a pressure distribution system,five feet for pressure sou asam+int system, <br /> required at manifold if gravity system,zero. wi:Y►•w <br /> C feet Todpips Wirth <br /> 3. Friction loss <br /> a. Enter friction loss table with gpm and pipe diameter. ` Elevation Di/farina <br /> Read friction loss in feet per 100 feet from table(F-14). P" r <br /> F.L._ /• ,ft./100 ft ofi <br /> PPe <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 pipe length= • <br /> le 5 x 1.251, /0 feet Friction Loss in Plastic Pipe <br /> c. Calculate total friction loss by multiplying <br /> friction loss in ft/100 ft by equivalent pipe length. ' Nominal <br /> Total friction loss= /0 Co x // (- +100= feet pipe dies. <br /> te <br /> 4. Total head required is the sum of elevation difference, Fl0wm 1.5" 2" 3" <br /> special head requirements,and total friction loss. <br /> 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 2.06 0.30 <br /> 40 8.91 2.64 0.39 <br /> TOTAL HEAD 1 i feet 45 11.07 3.28 0.48 <br /> 50 13.46 3.99 0.58 <br /> C. Pump selection 60 4.76 0.82 <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 /> 7. l gpm (Step A)..with at least 1 _feet of total hemi (Step B). <br /> ., <br /> i <br />