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F-17 <br /> PUMP SELECTION PROCEDURE <br /> END PERFORATION OF A PERFORATED LATERAL <br /> A. Determine pump capacity: <br /> Gravity Distribution <br /> 1. Minimum Minimum suggested is 600 gallons per hour(10 gpm) to stay ahead of :Lar•= - "Fbk <br /> water use rate. ,e-e ta,« <br /> ' N=A m rwn oaowl <br /> 2. Maximum suggested for delivery to a drop box of a home system is 2,700 P.rre=arcn nurw,b,=w rnrr, <br /> •• - Mm too w ioo <br /> gallons per hour(45 gpm)to prevent build-up of pressure in drop box. ,,.,,„ I2 la <br /> an FIMId 0 R. LqM <br /> rr LocorM of <br /> Pressure Distibution Pv1e.eHo <br /> �,,,,,s,,,,,�� 9onwn a La r.ro, <br /> 3.a. Select number of perforated laterals�_ <br /> b. Select perforation spacing= feet -'009-9 S.rr ►_.."swrrr,a <br /> C. Subtract 2 ft from the rock layer length. B.lor.PI-4 So-d Lo,er <br /> 1> 3 -2 ft.= 11 I feet <br /> Rock lay-I-,srh <br /> d. Determine the number of spaces between perforations. <br /> Length perf.spacing= I I L ft.+LL ft._ spaces Required Perforation Discharge <br /> e. Li tj_spaces+ 1 perforations/lateral m gallons Per minute(gpm) <br /> f. Multiply perforations per lateral by number of laterals to Discharge <br /> get total number of perforations. i-1 x �s<-_ ! ��perforations. Head i ° �'' <br /> g. <br /> MW gpm- <br /> 1.0a 0.56 0.74 <br /> SELECTED PUMP CAPACITY 3 3 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 /> feet <br /> 2. If pumping to a pressure distribution system,five feet for pressure <br /> required at manifold if gravityysstem,zero. <br /> feet <br /> 3. Friction loss <br /> a. Enter friction loss table with gpm and pipe diameter. Pipe Length <br /> Read friction loss in feet per 100 feet from table. Point of Discharge <br /> F.L.= 1. 4� ft/100 ft of pipe T y'6F <br /> b. Determine total pipe length from pump to discharge �Elelpoint Add 25 percent to pipe length for fitting Pa <br /> loss,or use a fitting loss chart. Equivalent pipe <br /> length-1.25 times pipe length= F-18b <br /> 1 a:0 x 1.25= /K 0 feet <br /> c. Calculate total friction loss by multiplying1.5 inch 2.0 inch 3.0 inch <br /> friction loss in ft/100 ft by equivalent pipe length. gpm Friction las per 100 ft of pipe <br /> Total friction loss= I y K x ) C) =100= _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 /> + S + 3 20 2.47 0.73 0.11 <br /> 25 3.73 1.11 0.16 <br /> (1) (2) (30 30 5.23 1.55 ' 0.23 <br /> 35 7.90 2.06'' 0.30 <br /> TOTAL HEAD _feet 40 11.07 2.28 0.39 <br /> 45 14.73 3.28 0.48 <br /> 50 3.99 0.58 <br /> C. Pum selection 55 4.76 0.70 <br /> Pump on 60 5.60 0.82 <br /> I. A pump must be selected to deliver at least <br /> i' gpm (Step A)with at least /_feet of total head (Step B). <br />