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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 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= 3 feet. 1.0a W%' 0.74 <br /> C. Subtract 2 ft.from the rock layer length. is 0.69 0.90 <br /> `i -2 ft.=�_feet. 20b 080 1.04 <br /> d. Determine the number of spaces between perforations. a Use 1.0 foot single homes. <br /> Length pert.spacing=�ft.+.-7 ft.= Q spaces b Use 2.0 feet for anything else. <br /> e. !3 spaces+1 = 1 LL perforationstlateral <br /> f. Multiply perforations per lateral by number of laterals to ��4 D,� <br /> get total number of perforations. � x , _ L perforations. <br /> g. x =.I.L gpm. <br /> SELECTED PUMP CAPACM . gpm <br /> B.Determine head requirements: <br /> 1. Elevation difference between pump and point of discharge. <br /> J_1_feet <br /> 2. If pumping to a pressure distribution system,five feet for pressure SW°"=MU sysom <br /> required at manifold if gravity system,zero. <br /> -9- Tom pia lh-no 9 <br /> 3. Friction loss <br /> a. Enter friction loss table with gpm and pipe diameter. EWad ,,D�„K <br /> Read friction loss in feet per 100 feet from table(F-14). pipe __ <br /> F.L.= /. 1, ft./100 ft of pipe <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 /> a4-< x 1.25= a'o La. 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= le-x Z 4, + "100=_ feet pipe dia. <br /> / <br /> Flow Rate <br /> 4. Total head required is the sum of elevation difference, pm 1.5" 2" 3" <br /> special head requirements,and total friction loss. <br /> 20 2.47 0.73 0.11 <br /> '_+ S-- + S 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 /> TOTAL HEAD ��, 11.0 <br /> 45 11.0feet 40 2.64 0.39 <br /> 7 3.28 0.48 <br /> 50 13.46 3.99 0.58 <br /> C. Pump selection 60 560 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 /> -3 1 -gpm (Step A)with at least �_feet of total head (Step B). <br />