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• <br /> PUMP SELECTION PROCEDURE <br /> A. Determine pump capacity: <br /> CGravity Distribution END PERFORATION OF A PERFORATED LATERAL <br /> 1. Minimum suggested is 600 gallons per hour(10 gpm)to stay ahead of Gra..Cover <br /> water use rate. <br /> %/i T4e011 . Y <br /> 2. Maximum suggested for delivery to a drop box of a home system is 2,700 ;,-.. .....;.4,..,.,,.,. <br /> llonsper hour(45gpm)toprevent build-upofpressure in dropbox. .''L }Layer - r Flo=lu.we.k tor./a�.- <br /> ga �sand I�oyr .,� <br /> 2 one lar«ra a papal <br /> �a`.coverw <br /> 11, 1 <br /> - iamr7-iL'arirvi�a: Par/oration OrMI.d Horizontally <br /> Pressure Distribution 7. - Mb .p Now rap <br /> 3. a. Select number of perforated laterals 3 3.4 Pla. .-, u Least le to Edon <br /> b. Select perforation spacing3 ft. PMI .l Rock layer <br /> = .-q--:: �., r <br /> • Pwtarollom tscal.d el <br /> c. Subtract 2 ft.from the rock layer length. xd` coos sand Loy.r Bottom el lateral <br /> ,I=ts ecnri-2 ft.=_12..ft. <br /> Od Mol Sea Pnporly Sculn.d <br /> Before Piecing Send Layer <br /> d. Determine the number of spaces between perforations. <br /> Length perf.spacing= SI ft.+ 3ft.= 1'7 Spaces TABLE OF PERPVRATION DISCHARGES IN CPM <br /> e. Y) spaces+1= 14( perforations/lateral <br /> f. Multiply perforations per lateral by number of laterals to Head Perforation diameter(Inches) <br /> et total nu ber of perforations. 7/II 14 <br /> . x p.M.A <br /> = Sy perforations. <br /> ,1 1Aa • 0.56 0.74 <br /> g. x 6Py'/Pry--,Y,y gym' 2Ab 0.80 104 <br /> 2.5 0.89 1.17 <br /> SELECTED PUMP CAPACITY 4 v 3.0 0.98 1.28 <br /> gpm 4A 1.13 1.47 <br /> 5.0 1.26 1.65 <br /> B.Determine head requirements: <br /> 1. Elevation difference between�uand point of discharge. aUse 1.0 foot of head for residential systems. <br /> m <br /> Pg bUse 2.0 feet of head for other establishments <br /> feet <br /> 2. If pumping to a pressure distribution system,add five feet for pressure <br /> required at manifold <br /> ar feet <br /> 3. Friction loss Pipe Length <br /> a. Enter friction loss table with gpm and pipe diameter. l t <br /> Point of Discharge <br /> Read friction loss in feet per 100 feet from table. /04'.0 <br /> F.L.= g•Ly ft./100 ft of pipe Elevation Difference <br /> b. Determine total pipe length from pump to discharge Pump 91••.a <br /> point. Add 25 percent to pipe length for fitting <br /> loss,or use a fitting loss chart. Equivalent pipe F-18b <br /> length-1.25 times ipe length= <br /> 5b� x 1.25= C feet 1.5 inch 2.0 inch 3.0 inch <br /> gpm Frictim loss per 1001t of pipe <br /> c. Calculate total friction loss by multiplying 10 0.69 0.20 <br /> friction loss in ft/100 ft by equivalent pipe length. 12 0.96 0.28 <br /> Total friction loss= a.lo9 x LS +100= 2... feet 14 1.28 0.38 <br /> 4. Total head required is the sum of elevation difference, 16 1.63 0.48 <br /> special head requirements,and total friction loss. 20 2.47 0.70 <br /> 20 2.47 0.73 0.11 <br /> 25 3.73 1.11 0.16 <br /> + + Z 30 5.23 1.55 0.23 <br /> (1) (2) (3c) 35 7.90 2.06 0.30 <br /> 40 11.07 2.64 0.39 <br /> 45 14.73 3.28 0.48 <br /> TOTAL HEAD I(o feet 50 3.99 0.58 <br /> 55 4.76 0.70 <br /> 60 5.60 0.82 <br /> C. Pump selection <br /> 1. A pump must be selected to deliver at least 9 0 gpm (Step A) <br /> with at least /b feet of total head (Step B). <br />