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t <br /> . F-17 <br /> PUMP SELECTION PROCEDURE <br /> no PERFORATION OF a PERFORATED LATERAL <br /> A. Determine pump capacity: 1 G...Co..t <br /> Gravity Distribution Tipi1I -,� <br /> 1. Minimum suggested is 600 gallons per hour(10 gpm)to stay ahead of = ,:._' (`�.(.t«c..w.t..rrte,.t..• <br /> water use rate. ... S0i°un-• • ^;,=„.' WwN <br /> o.o., <br /> 2. Maximum suggested for delivery to a drop box of a home system is 2,700 .77,■.,r-ammis P.7:-..,:::-iatet•.o,„,»..0i, <br /> l..t <br /> gallons per hour(45 gpm)to prevent build-up of pressure in drop box. 1,•.„w N , .E.,, <br /> . Pui.ratt.r laat.d.t <br /> Pressure Distibution . ct..t. -la,. B.tt.ttt.1 L•t•^t <br /> 3.a. Select number of perforated laterals 37 . <br /> • <br /> b. Select perforation spacing= 3 feet .,., Seurilted <br /> , ,,.. L„a <br /> c. Subtract 2 ft.from the rock layer length. <br /> - -2ft= _s'z, feet. <br /> Reck layer lasygli <br /> d. Determine the number of spaces between perforations. <br /> Length perf.spacing= ft.+ ft.=___La spaces Required Perforation Discharge <br /> e. 1') spaces+1= 1 V perforations/lateral in gallons per minute(gpm <br /> f. Multiply perforations per lateral by number of laterals to 114 9 Discharge , "a <br /> get total number of perforations. x ,,t.4_ .<M perforations. <br /> Head j �2 "fed <br /> g. 1 x-;7.4...al.)gp in. <br /> .. l.gpm. . <br /> 1.0a 0.56 0.74 <br /> SELECTED PUMP CAPACITY 9 i) 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 /> H feet <br /> 2. If pumping to a pressure distribution system,five feet for pressure <br /> required at manifold if gravit ystem,zero. <br /> SS 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= D.Log ft/100 ft of pipe 5y''' .0 <br /> b. Determine total pipe length from pump to discharge Elevation Difference <br /> point Add 25 percent to pipe length for fitting pump 9aa 0 <br /> loss,or use a fitting loss chart. Equivalent pipe <br /> length-1.25 times plpe length= <br /> l '1 x 1.25= al 1 1( feet F-18b <br /> c. Calculate total friction loss bymultiplying 15 inch 2.0 inch 3.0 inch <br /> multi P Yi g gpm trtsion ion pa loos et pipe <br /> friction loss in ft/100 ft by equivalent pipe length. 10 0.69 0.20 <br /> Total friction loss= of 1 le x �.h L +100= L., 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 /> 1) + g' +____Ce____ 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 a feet 45 14.73 3.28 0.48 <br /> 50 3.99 0.58 <br /> 55 4.76 0.70 <br /> C. Pump selection 60 5.60 0.82 <br /> `Z..) 1. A pump must be selected to deliver at least <br /> 4 0 gpm (Step A)with at least aZ feet of total head(Step B). <br />