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• <br /> 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 �a,.ee c..., <br /> water use rate. .. " Ta..a <br /> 2. Maximum suggested for delivery to a drop box of a home system is 2,700 . _ <br /> gallons per hour(45 gpm)to prevent build-up of pressure in drop box. . ' Lawny send tap,, •�..inchmot ei tor'a'coni 'unwed test. <br /> . .len reset Neer <br /> • eilj Pele .le.lien aa1.1 Nerl..IsMp <br /> Pressure Distribution ► lir sswlnMeer r•N <br /> 3. a. Select number of perforated laterals ,,,1/4.pia <br /> b. Select perforation spacing= Z ft. �` dd • <br /> ,e1ew+«e <br /> .'•.,, of <br /> t+«LAWN <br /> c. Subtract 2 ft.from the rock layer length. p...send urn alr'e«Leme <br /> ttat �ee li-2 ft.sa _53 ft. • .P <br /> r`•► ` Corl.leel Sen ►nealp Se.riflN <br /> s.le.Piecing Send Leger <br /> d. Determine the number of spaces between perforations. <br /> Length perf.spacing= M ft.+ ft.ee 1 2 spaces <br /> TABLE OF PERPORATION DISCHARGES IN CPM <br /> c. t 7 spaces+ 1 =1 K 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 ,,,1L.= SY perforations.esi pip v. <br /> 1.Oa 0.56 0.74 <br /> 13 0.69 0.90 <br /> g. �e x si:m7prilf= Li D gpm. 2.0b 0.80 1.04 <br /> 23 0.89 1.17 <br /> SELECTED PUMP CAPACITY Li D 3.0 0.981.28 <br /> gpm 4.0 11.1133 1.47 <br /> 5.0 1.26 1.65 <br /> B.Determine head requirements: sUse 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 /> I t) 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 100 feet from table. <br /> F.L.= 0.C.exi ft./100 ft of pipe Elevation Difference' <br /> b. Determine total pipe length from pump to discharge Pump &s- <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= <br /> 1.5 inch 2.0 inch 3.0 inch <br /> /em x 1.25= .2 30 feet gpm Frieda'lass per 100ft of pipe <br /> c. Calculate total friction loss by multiplying <br /> 0.69 0.20 <br /> friction loss in ft/100 ft by equivalent pipe length. 12 0.96 0.28 <br /> Total friction loss= -) x . ...y +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 /> 1 0 + s- .. +_4,2_ 30 5.23 1.55 0.23 <br /> (1) (2) :.43c) 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 a 1 feet 50 3.99 0.58 <br /> 55 4.76 0.70 <br /> 60 5.60 0.82 <br /> Pump selection <br /> 1. A pump must be selected to deliver at least Li n gpm (Step A) <br /> with at least a) feet of total head (Step B). <br />