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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 -Grass ca„er <br /> water use rate. <br /> ..,, Topsoil \`44 <br /> 2. Maximum suggested for delivery to a drop box of a home system is 2,700 _... :,.: ,, .. <br /> .1".!; <br /> '.Layer of Geolekiile FaWlc for fas- <br /> gallons per hour(45 gpm) to prevent build-up of pressure in drop box. ,_i-.' Loom Sand Layer r,,c„layer of Gel=t4,:.:soon caer.d <br /> . - with red rosin paperl <br /> tilpirnmas. Perforation Drilled Horizontally <br /> Pressure Distribution c]f . Into cap Near Top <br /> 3. a. Select number of perforated laterals Plus ' of Least y to Edge <br /> 'rain Field Rock,. -.,..t;� of Rock Layer <br /> b. Select perforation spacing= ft. <br /> Perforotloets Located al <br /> c. Subtract 2 ft. from the rock layer length. clean sand Layer Bottom of Lateral <br /> Rock layer leagttt-2 ft.= ft. , <br /> Original Soil 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 GPM <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 /> ��7/32 t/4 <br /> perforations. <br /> atlaX speris/lateral- <br /> - <br /> 1.0a 036 0.74 <br /> 1.5 0.69 0.90 <br /> g. PerlaxgpgpT=-----gpm• 2.0b 0.80 1.04 <br /> 2.5 0.89 1.17 <br /> SELECTED PUMP CAPACITY , 453.0 1.13 1.28 <br /> gpm 4.0 1.13 1.47 <br /> 5.0 1.26 t65 <br /> B.Determine head requirements: <br /> 1. Elevation difference between um andpoint of discharge. aUse 2.0.0 foot ofohead forfar Cher residential shsystems.nts <br /> P g bUse feet head other establishments <br /> feet <br /> 2. If pumping to a pressure distribution system,add five feet for pressure <br /> required at manifold <br /> 5 feet <br /> 3. Friction loss Pipe Length <br /> a. Enter friction loss table withgpm and pipediameter. t { <br /> Point of Discharge <br /> Read friction loss in feet per 100 feet from table. <br /> F.L.= 3,2-8 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 pipe times length=_ /r 1.5 inch 2.0 inch 3.0 inch <br /> x 1.25 = 4 4' 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. 12 0.96 0.28 <br /> Total friction loss= 44- x ',2;Fro +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 0.60 <br /> 20 2.47 0.73 0.11 <br /> 13 + 5 + "1- 30 3.73 1.110.16. <br /> 30 5.23 1.5555 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 2-0 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 `P gpm (Step A) <br /> with at least feet of total head (Step B). <br />