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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 -Gras.tear <br /> water use rate. .,^�--k--.e.„....- <br /> ` <br /> Topsoil <br /> 2. Maximum suggested for delivery to a drop box of a home system is 2,700 -r:- , A,. <br /> Layer of Geolostile Fabric (or low- <br /> gallons per hour(45 gpm) to prevent build-up of pressure in drop box. • Loamy Sand Layer inch layer of hay or straw cowered <br /> with red rosin paper) <br /> TerTwgad_LgjerpJ� '-Perlilotiun Drilled Hop/oniony <br /> Pressure Distribution ow'' "•'•v`''" I Into C p Near Top <br /> 3. a. Select number of perforated laterals "Plus \ \---3-Al Least le to Edge <br /> il,Orotn Field_Rock�;j� _ L o1 Rock Layer <br /> b. Select perforation spacing= ft. <br /> --Per'oral ions Luca led at <br /> c. Subtract 2 ft. from the rock layer length. Clean Sand Layer Bottom of Lateral <br /> Rock layer length-2 ft.= ft. <br /> Original Soil Properly Scarified <br /> Before Placing Sand Layer <br /> d. Determine the number of spaces between perforations. <br /> Length pert.spacing= ft.+ ft.= spaces TABLE OF PERFORATION DISCHARGES IN CPM <br /> C. 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 /> X perforations. 7/32 ti' <br /> alta eras a 7:17.711=atera - <br /> 1.0a 0.56 0.74 <br /> 1.5 0.69 0.90 <br /> g. Perls X gpm�rf= gpm. 2.Ob 0.80 1.04 <br /> 2.5 0.89 1.17 <br /> 1.28 <br /> i 3.0 0.98 <br /> SELECTED PUMP CAPACITY c� gpm 4.0 1.13 1.47 <br /> 5.0 1.26 1.65 <br /> B.Determine head requirements: <br /> aUse 1.0 foot of head for residential systems. <br /> 1. Elevation difference between pump 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 /> ,. feet <br /> 3. Friction lossPipe Length <br /> I <br /> I <br /> a. Enter friction loss table with gpm and pipe diameter. Point of Discharge <br /> Read friction loss in feet per 1(X)feet from table. <br /> F.L.= 2 ?' 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 /> 4'7 x 1.25= 5 lJ feet gpm 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. i 12 0.96 0.28 <br /> Total friction loss= E0 x 2 Co 7., +100= 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 2.03 0.70 <br /> 20 2.47 0.73 0.11 <br /> 25 3.73 1.11 0.16 <br /> rf30_ 5.23 1.55 0.23 <br /> ,' + + -13`, 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 I `e feet 50 3.99 0.58 <br /> 55 4.76 0.70 <br /> 60 5.60 0.82 <br /> C. Pump selection <br /> 2. <br /> 1. A pump must be selected to deliver at least L tgpm (Step A) <br /> with at least ! feet of total head (Step B). <br />