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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 Gros.co„„ <br /> . Y <br /> water use rate. ' ' ``�i <br /> <�a< <br /> J • Topsoil <br /> 2. Maximum suggested for delivery to a drop box of a home system is 2,700 . . <br /> '' Lem of Geole:til.Fabric(or fout- <br /> gallons per hour(45 gpm)to prevent build-up of pressure in drop box. ;. Loony sone Layer i layer of hay et soon carved <br /> 4.-,,..._• . . . r ;r:with red rosin paper) <br /> Pressure Distribution Ih2,If•4•f1y111,11�i Perforation Drilled Norironiolly <br /> Into •p Near Top <br /> ��/4%us �; Al Least 12'to Edge <br /> 3. a. Select number of perforated laterals 3 'i;.a FI.Id Roc _ of Rocs Layer <br /> b. Select perforation spacing= 3 ft. - • ' ' x"" <br /> Perforotlorts Cooled al <br /> c. Subtract 2 ft.from the rock layer length. clean Sand Loser Bottom of Lateral <br /> Rock <br /> '5-laye <br /> -2 ft.= S3 ft. _ ..... 4..•, <br /> Original Soil Properly Scarified <br /> Before Piecing Sand Layer <br /> d. Determine the number of spaces between perforations. <br /> Length perf.spacing= 53 ft.+ 3 ft.= 1") spaces TABLE OF PERFORATION DISCHARGES IN GPM <br /> e. 12 spaces+1 = 1V perforations/lateral <br /> ' f. Multiply perforations per lateral by number of laterals to Head Perforation diameter(inches) <br /> get total number of perforations. <br /> ma-• x �� _ ,<� perforations. tin 1/' <br /> �aa 1.0a 056 . 0.74 <br /> g. 4 x ? $Pm• 2506 0.69. 1.0044 <br /> Pte• aPm P�- <br /> 25 0.89 1.17 <br /> 3.0 0.98 1.28 <br /> SELECTED PUMP CAPACITY 1-1 0 gpm 4.0 1.13 1.47 <br /> 5.0 1.26 1.65 <br /> B.Determine head requirements: <br /> 1. Elevation difference between pumpand point of discharge. aUse 1.0 foot of head for residential systems. <br /> $ bUse 2.0 feet of head for other establishments <br /> t--f feet <br /> 2. If pumping to a pressure distribution system,add five feet for pressure <br /> required at manifold <br /> S.-- feet <br /> 3. Friction loss I Pipe Length <br /> gt <br /> a. Enter friction loss table with gpm and pipe diameter. Point of Discharge <br /> Read friction loss in feet per 100 feet from table. <br /> F.L.= a.1,H ft./100 ft of pipeElevation Difference <br /> b. Determine total pipe length from pump to discharge p) ,p ge.0 <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 /> a S x 1.25= 3 I feet Friction loos per 100 ft of pipe <br /> c. Calculate total friction loss by multiplying <br /> friction loss in ft/100 ft by equivalent pipe length. 10 0.96 0.69 .28 <br /> Total friction loss= D ,(., 9 x 3 1 +.100= ) feet 14 1.28 0.38 <br /> 4. Total head required is the sum of elevation difference, 16 1.63 0.48 <br /> special1head requirements,and total friction loss. 20 2.03 0.60 <br /> � 20 2.47 0.73 0.11 <br /> 25 3.73 1.11 0.16 <br /> LI + S + ) 30 5.23 1.55 0.23 <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 / 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 Li£ ,gpm (Step A) <br /> with at least /0 feet of total head (Step B). <br />