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PUMP SELECTION PROCEDURE <br /> A. Determine pump capacity: <br /> Gravity Distribution END PERFORATION OF A PERFORATED LATERAL <br /> 1. Minimum suggested is 600 gallons per hour(10 gpm)to stay ahead of �Grau cover <br /> ,__,L_.__s_______e .,L. <br /> water use rate. <br /> *. •Topsoil i <br /> 2. Maximum suggested for delivery to a drop box of a home system is 2,700 e.r . --r-- %,a <br /> Layer of Geotestlle FaWic(w toot- <br /> gallons per hour(45 gpm)to prevent build-up of pressure in drop box. • Loony Sand Layer 'Inch layer a hay w s,raw roved <br /> . with red rosin paper) <br /> L• _ <br /> _wgl- aJ n ('�. Perforation Drilled Noruontany <br /> Pressure Distribution <br /> t'• 7`. Into Cop Near Top <br /> 3. a. Select number of perforated laterals ``yi:Pias :.-Al Least lz•to Edge <br /> b. Select perforation spacing ft. 'MehlF=e'dS7d L\ of Rock Layer <br /> P g -Perforation Located at <br /> c. Subtract 2 ft. from the rock layer length. clan Sand layer 8011°"'°' Latefal <br /> Rockleyeriength -2 ft.= ft. 't ' ' - w - .• <br /> Onomol Son Properly Scarified <br /> Before Placing Sand Layer <br /> d. Determine the number of spaces between perforations. <br /> Length perf.spacing= ft.+ ft.= spaces TABLE OF PERFORATION DISCHARGES IN CPM <br /> e. spaces+ 1 = perforations/lateral <br /> f. Multiply perforations per lateral by number of laterals to Head Perforation diameter(inches) <br /> get total number of perforations. - <br /> - perforations. y/" ti' <br /> x <br /> tars Perls/lateral - <br /> 1.0a 0.56 0.74 <br /> 1.5 0.69 <br /> x BM-VP(= gPm• 2.0b 0.80 0.90 <br /> g. rs 1.04 <br /> 2.5 0.89 1.17 <br /> SELECTED PUMP CAPACITY gpm 3.0 0.98 1.28 4.0 1.13 1.47 <br /> 5.0 1.26 1.65 <br /> B.Determine head requirements: aUse 1.0 foot of head for residential systems. <br /> 1. Elevation difference between;imp and point of discharge. 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 /> e feet <br /> 3. Friction loss Pipe Length <br /> I <br /> a. Enter friction loss table with gpm and pipe diameter. I Point of Discharge <br /> Read friction loss in feet per 100 feet from table. <br /> F.L.= : (00 ft./100 ft of pipe Elevation Difference <br /> b. Determine total pipe length from pump to discharge Pump <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 pipe length= 1.5 inch 2.0 inch 3.0 inch <br /> �•O x 1.25= -g4 feetgpm Friction loss per 100 ft 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= s0 x j 60 +1(H)= / feet 14 1.28 0.38 <br /> 4. Total head required is the sum of elevation difference, 4 1.63 <br /> 2.03 �0.60< 060 <br /> special head requirements,and total friction loss. 2.47 0.11 <br /> _____6___+ 4-5------ + / 25 3.73 1.11 0. 3 <br /> 30 5.23 1.55 0.223 <br /> 35 7.90 2.06 0.30 <br /> (1) (2) (3c) 40 11.07 2.64 0.39 <br /> 45 14.73 3.28 0.48 <br /> TOTAL HEAD /2 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 /8 gpm (Step A) <br /> with at least /Z feet of total head (Step B). <br />