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, • , <br /> 1,` F-17 <br /> .;_4.p. PUMP SELECTION PROCEDURE <br /> ENO PERFORATION OF A PERFORATED LATERAL <br /> A. Determine pump capacity: L -tree.Cf... <br /> Gravity Distribution ,,�.,, „v1. Minimum suggested is 600 gallons per hour(10 gpm)to stay ahead of = '? - <br /> L..,Soc toyer tont oI.d I.y hwk/r„'' <br /> water use rate. '.tie a t �.,, o.. <br /> 2. Maximum suggested for delivery to a drop box of a home system is 2,700 = -■7-l..•.!B ti 4 p tt:Heti=.,.th <br /> gallons per hour(45 gpm)to prevent build-up of pressure in drop box. .'•.,;Pt.. -Al• Least 12•t.Edge <br /> Id of R.ct tot« <br /> _.. Preendler..loreted et <br /> Pressure Distibution ? c....sa„d L,,.r 8"'°'"a 1.""W <br /> 3.a. Select number of perforated laterals J _1 ill Preemie,tf� <br /> b. Select perforation spacing= 3 feet. Beier.ion.Medea Stud ied <br /> Lew <br /> c. Subtract 2 ft.from the rock layer length. <br /> , ,� <br /> d. Rock Determine <br /> S'4 feet. <br /> layer <br /> une the number of spaces between perforations. <br /> Length perf.spacing= .S7 ft.+ -Z ft.= 17 spaces Required Perforation Discharge <br /> e. 11 spaces+1= 14 perforations/lateral in gallons per minute(gpm <br /> ead <br /> f. Multiply perforations per lateral bynumber of laterals to Discharge 7z a�poe endget total number of perforations. ,,,t„!. x peru/lateral= Sy perforations. (feet) pert <br /> g. x = L-I 0 gpm. <br /> 1.0a 0.56 0.74 <br /> SELEC I hU PUMP CAPACITY LID gpm 2.Ob 0.80 1.04 <br /> B.Determine head requirements: a.Use for single family homes <br /> 1. Elevation difference between pump and point of discharge. b.Use for all other applications <br /> I y feet <br /> tr ^� 2. If pumping to a pressure distribution system,five feet for pressure <br /> =4*"- required at manifold if gravity system,zero. <br /> • S feet <br /> . 3. Friction loss <br /> • a. Enter friction loss table with gpm and pipe diameter. Pipe Length <br /> Read friction loss in feetr 100 feet from table. <br /> I� Point of Discharge <br /> F.L.= ')t(.LJ . ft./100 ft of pipe ____ ! <br /> b. Determine total pipe length from pump to discharge Elevation Difference) <br /> point Add 25 percent to pipe length for fitting Pump g9 <br /> loss,or use a fitting loss chart. Equivalent pipe <br /> length-1.25 times pipe length= F-18b <br /> )N1) x1.25= 10S feet <br /> ' c. Calculate total friction loss bymultiplying1.5 inch 2pe inch ape inch <br /> gpm Friction 1«.pc 100 ft o[pipe <br /> friction loss in ft/100 ft by equivalent pipe length. <br /> Total friction loss= 'Z,(ey x I ') � +100= .S feet 10 0.69 0.20 <br /> 12 0.96 0.28 <br /> 4. Total head required is the sum of elevation difference, 14 1.28 0.38 <br /> special head requirements,and total friction loss. 16 1.63 0.48 <br /> 18 2.03 0.60 <br /> 20 2.47 0.73 0.11 <br /> p-I + � + .S 25 3.73 1.11 0.16 <br /> (1) (2) (3c) 30 5.23 1.55 0.23 <br /> 35 7.90 2.06 0.30 <br /> 40 11.07 2.64 0.39 <br /> TOTAL HEAD q feet 45 14.73 3.28 0.48 <br /> 50 3.99 0.58 <br /> C. Pump selection 55 4.76 0.82 <br /> 1. A pump must be selected to deliver at least <br /> 1-10 gpm (Step A) with at least ay feet of total head (Step B). <br />