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a 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 3 , 7/32 1/4 <br /> b. Select perforation spacing= z, feet. 1.0a 0.56' 0.74 <br /> c. Subtract 2 ft.from the rock layer length. 13 0.69 0.90 <br /> 20b 0.80 1.04 <br /> la l+-2ft= laO feet. ' <br /> r` a Use 1.0 foot singlehomes. <br /> d. Determine the number of spaces between perforations. <br /> Length pert.spacing= '` ft.+_a__ft= a U spaces b Use 2.0 feet for anything else. <br /> e. , v_spaces+1 ==1_perforations/lateral <br /> f. Multiply perforations per lateral by number of laterals to ,,4 <br /> get total number of perforations. turas x .m=��perforations. <br /> x ,"7,peri=.aa gpm. <br /> SELEL i hsU PUMP CAPACITY , y 7 gpm <br /> B.Determine head requirements: <br /> 1. Elevation difference between pump and point of discharge. <br /> c)t feet <br /> 2. If pumping to a pressure distribution system,five feet for pressure sor treatment <br /> from <br /> required at manifold if gravity system,zero. " liff /,,j5--- <br /> 5 <br /> ',vim5 feet Tbtal pip'l 'rth <br /> 3. Friction loss <br /> a. Enter friction loss table with gpm and pipe diameter. r. . Mention Difference <br /> Read friction loss in feet per 100 feet from table(F-14). p'p' <br /> F.L.= LI ft./100 ft of pipe 1 i <br /> b. Determine total pipe length from pump to discharge ,(i... �i <br /> ... .. <br /> point Estimatebyadding25 percent to pipe length <br /> for fitting <br /> loss,or use a fitting loss chart(F-15_._feet). <br /> Equivalent pipe length- 1.25 times pipe length= • <br /> '71' x 1.25= ) ) ")_ feet Friction Loss in Plastic Pipe <br /> c. Calculate total friction loss by multiplying Nominal <br /> Friction loss in ft/100 ft by equivalent pipe length. pipe dia. <br /> Total friction loss= 3.'-I x i ) a +100. `1 feet Flow Rate 15" 2" 3" <br /> 4. Total head required is the sum of elevation difference, gpm <br /> special head requirements,and total friction loss. <br /> 20 2.47 0.73 0.11 <br /> + ' + Li 25 3.73 1.11 0.16 <br /> (1) (2) (3c) 30 .5.23 135 0.23 <br /> 35 6.96 2.06 0.30 <br /> 2.64 0.39 <br /> TOTAL HEAD <br /> feet 4455 1107 3.2,80.48 <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 /> 1. A pump must be.s'elected to deliver at least • <br /> gpm (Step A).with at least feet of total head (Step B). <br />