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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 ,-&aee cover <br /> water use rate. ' . -r-� <br /> Topsoil y°. <br /> 2. Maximum suggested for delivery to a drop box of a home system is 2,700r. x- --_ <br /> gallons per hour(45 gpm)to prevent build-up of pressure in drop box. LoornY send I V*r kWhInv*r ofehertelt strew towed <br /> emh rr0 resin pop") <br /> r all` Mrlorolion Orlllyd l4orteentell <br /> Pressure Distribution ` W Inge c p floor yap y <br /> 3. a. Select number of perforated laterals 3 %•Plat , �c;�-At Matt 12.1.Cade <br /> b. Select perforation spacing tQLom trld_!e e+ Hoch Layer <br /> r" P O= f t• P.rturoliont Located of <br /> c. Subtract 2 ft. from the rock layer length. clean sand Layer Bottom of Lateral <br /> « Layer <br /> , n� -2 ft.= .r-_ ft. <br /> Orlalnol Sell Properly Scordled <br /> d. Determine the number of spaces between perforations. Bolero Placing Sand Layer <br /> Length perf.spacing=_c S ft.+ ft.= I ) spaces TABLE U PLRVORATION DISCHARCL•S 1N CPM <br /> C. M spaces+ 1 =_IV perforations/lateral <br /> f. Multiply perforations per lateral by number of laterals to Head Perforation diameter(inches) <br /> get total number of perforations. <br /> xSy perforations. <br /> oleo a erre lrrel- <br /> 1.03 0.56 0.74 <br /> g. reef' x ti?J = y D gpm. 1 ' 0.69 0.90 <br /> 2.Ob 0.80 1.04 <br /> 2.5 0.89 1.17 <br /> SELECTED PUMP CAPACITY0 m 3.0 0.98 1.28 <br /> �-�p 4.0 1.13 1.47 <br /> 5.0 1.26 1.65 <br /> B.Determine head requirements: <br /> 1. Elevation difference between and tot of dis:liar e. allse 1.0 foot of head for residential systems. <br /> pump P Pn g blise 2.0 feet of head for other establishments <br /> 1 t, feet <br /> 2. If pumping to a pressure distribution system,add five feet for pressure <br /> required at manifold <br /> b feet <br /> 3. Friction loss Pipe Length <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.= D.•LL I ft./100 ft of pipe Differenceb. Determine total pipe length from pump to discharge Ey__�Elcvakinn <br /> mp �y <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 0 <"' x 1.25= ?•S L, feet spm Friction leas Per 100 n 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= 0 . 1- x a.S(' +100= I 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 /> / + S' +�_ 30 5.23 1.55 0.23 <br /> (1) (2) (30 35 7.90 2.06 0.30 <br /> 40 11.07 2.64 0.39 <br /> 45 14.73 3.280.48 <br /> TOTAL HEAD feet 50 3.99, 0.58 <br /> 55 4.76 0.70 <br /> 60 5.60 0.82 <br /> Pump selection <br /> t. A pump must be selected to deliver at least 14• gpm (Step A) <br /> with at least ').'1 feet of total head (Step B). <br />