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• <br /> . PUMP SELECTION PROCEDURE <br /> A. Determine pump capacity: <br /> GIavity Distribution END PERFORATION OF A PERFORATED LATERAL <br /> 1. Minimum suggested is 600 gallons per hour(10 gpm)to stay ahead of Grass Cover <br /> water use rate. •'<'` <br /> ��`. Topsoil \` �°. <br /> 2. Maximum suggested for delivery to a drop box of a home system is 2,700 . _.... ... . <br /> ;1-.1.. ' `, Layer of GeolmIlle Fobrk tot tour- <br /> gallons per hour(45 gpm)to prevent build-up of pressure in drop box. =_; Loamy sand Layer .Inclayer er hay or draw cowered <br /> . _ with red rode paper) <br /> ( C71 UR1IIE7____ - phi rOlrrforap n DrIlldp HorI onIollr <br /> Pressure Distribution .w . <br /> 3. a. Select number of perforated laterals .`"oPus -` Al east 12•to Edge <br /> r . Field Roc ._, of Rock Layer <br /> b. Select perforation spacing= 3 ft. ' eau;'d LoLo led of <br /> r clean Sand Layer <br /> c. Subtract 2 ft.from the rock layer length. <br /> teral <br /> Radc1eyerkngtt,-2 ft.= S3 ft. <br /> Original Soli Properly Scarllled <br /> Wore Placing Sand Layer <br /> d. Determine the number of spaces between perforations. <br /> Length perf.spacing= „5-2 ft.+ ft.= ►'7 spaces TABLE OF PERFORATION DISCHARGES IN CPM <br /> e. l r1 spaces+ 1 = 1 ee perforations/lateral <br /> ' f. Multiply perforations per lateral by number of laterals to Head Perforation diameter(inches) <br /> get total number of perforations. , <br /> e x. = <L1 perforations. �" �' <br /> 1.0a 036 0.74 <br /> 5u x'()LI = �-f ugpm. 1-5 0.69 0.90 <br /> g <br /> t 4 2.0b 0.80 1.04 <br /> 2.5 0.89 1.17 <br /> SELECTED PUMP CAPACITY 1...-.) (..) 3.00.98 1.28 <br /> gpm 4.0 1 1.1133 1.47 <br /> 5.0 1.26 1.65 <br /> B.Determine head requirements: <br /> 1. Elevation difference betweenpumpand point of discharge. aUse 1.0 foot of head for residential systems. <br /> Ig 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 /> 5- feet <br /> 3. Friction loss Pipe Length <br /> t <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. 1 x <br /> F.L.= "DA.t-{` ft./100 ft of pipe Elevation Difference <br /> b. Determine total pipe length from pump to discharge Pump 41.1_ <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.(.. x 1.25 = DS-0 feetgpm Frialca logs 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= a,SC) x D-(,Lt +100= '? feet 14 1.28 0.38 <br /> 4. Total head required is the sum of elevation difference, 16 1.63 0.48 <br /> 18 2.03 0.60 <br /> special head requirements,and total friction loss. 20 2.47 0.73 0.11 <br /> 25 3.73 1.11 0.16 <br /> 11 + s + '7 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 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 ti 0 gpm (Step A) <br /> with at least afeet of total head (Step B). <br />