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F-17 <br /> PUMP SELECTION PROCEDURE <br /> END PERFORATION OF A PERFORATED LATERAL <br /> A. Determine pump capacity. CO-C« <br /> Gravity Distribution r...W Ai+i <br /> 1. Minimum suggested is 600 gallons Per hour(10 gpm)to stay ahead of <br /> i;t... • L�of Aw be(.. <br /> ew- <br /> water use rate. ����s~���« i ��tam P a) r...w <br /> 2. Maximum suggested for delivery to a drop box of a home system is T« <br /> 2,700 Im cap 0^ �•^•� <br /> w»u »«, i <br /> gallons per hour(45 gpm)to prevent build-up of pressure in drop box. y; w Lw.. �:• c.,. <br /> Pressure Distibution ft"L"W <br /> 3.a. Select number of perforated laterals <br /> b. Select perforation spacing= a' r feet ells l" 5WW L <br /> C. Subtract 2 ft from the rock layer length. <br /> -2 ft. feet <br /> d. Determine the number of spaces between perforations. <br /> Length perf.spacing= a S ft.+ -19-ft.=10 spaces Required Perforation Disch�cge <br /> e. L spaces+1= 1t.perforations/lateral in gallons per minute(gpQ1> <br /> f. Multiply perforations per lateral by number of laterals to ` a ;i2 and PA as PW <br /> get total number of perforations. , x ,�= 3 3 perforations. (feet) <br /> g. 4n x�P•+=29-gpm. 1.0a 0.56 04 <br /> SELECTED PUMP CAPACITY 3 gpm 2.Ob 0.80 C104 <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 /> J feet <br /> 2. if pumping to a pressure distribution system,five feet for pressure <br /> 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 feet per 100 feet from table. Point of Dischar e <br /> F.L.= a.0 fL/100 ft of pipe T-]% <br /> b. Determine total pipe length from pump to discharge Elevation Difference <br /> point. Add 25 percent to pipe length for fitting DPurnp 7 01< <br /> loss,or use a fitting loss chart. Equivalent pipe <br /> length-1.25 times pipe length= F-18b <br /> ) H0 x 1.25=-I feet <br /> c. Calculate total friction loss b multiplying1.5 inch 2A inch 3.0 inch <br /> Y gpn, oma+I..per too n of Pia <br /> friction loss in ft/100 ft by equivalentipe length. 10 0.69 0.20 <br /> Total friction loss- ?..u x 1 ') +100= y feet 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 /> D+ '5" _+_y_ 25 3.73 1.11 0.16 <br /> (1) (2) (36 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 .��feet 45 14.73 3.28 0.48 <br /> 50 3.99 0.58 <br /> C. Pump selection 60 5.60 0.82 <br /> 1. A pump must be selected to deliver at least <br /> gpm (Step A)with at least ')q feet of total head(Step B). <br />