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F-17 <br /> PUMP SELECTION PROCEDURE <br /> END PERFORATION OF A PERFORATED LATERAL <br /> A. Determine pump capacity: w•"Com. <br /> Gravity Distribution T•.•«I s;��' <br /> 1. Minimum suggested is 600 gallons per hour(10 gpm) to stay ahead of . =1.41,:r:.: :..=1„.:::::"" <br /> y.,•,�„� ,,lk,,,,,,. <br /> water use rate. - • <br /> L.'./Sob L.pr . I .t MI-va•e...~ <br /> .11a red.main tom/ <br /> 2. Maximum suggested for delivery to a drop box of a home system is 2,700 :,7rrz-.■.srris t -'••;'„•o"' "°^.°n'•'^' <br /> gallons per hour(45 gpm)to prevent build-up of pressure in drop box. •.,;p., _--.t L.o.. l:•1.u,. <br /> .o Id .f Roca Lo/.t <br /> ..•. • Prf.t.11.,r Loo1.4.t <br /> '!• 0.11.10 el LeonelPressure Dislibution c,...,svd urr <br /> 3.a. Select number of perforated laterals 3 • ' • -. <br /> b. Select perforation spacing= 3 feet. HBe Moon ll "�I,M""' <br /> c. Subtract 2 ft.from the rock layer length. <br /> -SSS-2ft.= .5-3 feet. <br /> d. Determine the number of spaces between perforations. <br /> Length perf.spacing= $3 ft.+LI_ft.=_I'LL spaces Required Perforation Discharge <br /> e. l') spaces+1= 1 `/ perforations/lateral u,gallons per minute(gptn) <br /> f. Multiply perforations per lateral by number of laterals to D Ham`age 32 inch pee( and p,l <br /> g get total number of perforations.p ,•, ; x P!„/,mQa,= sy perforations. (feel) <br /> '� - 1.0a 0.56 0.74 <br /> SELEeI EU PUMP CAPACITY y D 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 /> D feet <br /> ' 2. . If pumping to a pressure distribution system,five feet for pressure <br /> '' required at manifold if gravitystem,zero. <br /> _Meet <br /> 3. Friction loss <br /> a. Enter friction loss table with gpm and pipe diameter. Pipe mgt l <br /> Read friction loss in feet per 100 feet from table. Point of Discharge <br /> F.L.= D,I,LI ft./100 ft of pipe 9e <br /> b. Determine total pipe length from pump to discharge Elevation Difference <br /> • point. Add 25 percent to pipe length for fitting �p„r„p • <br /> c,;(4„ <br /> loss,or use a fitting loss chart. Equivalent pipe <br /> length-1.25 times ipe length= F-18b <br /> x1.25 = 1(7.(- feet <br /> 1.5 inch 2.0 inch 3.0 inch <br /> c. Calculate total friction loss by multiplying gpm Friction loss per lOOtto[pipe <br /> friction loss in ft/100 ft by equivalent pipe length. <br /> Total friction loss= , ,I,•I x )'7 , +100= S feet 10 0.69 0.28 <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 /> S + ,..c'.--. 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 P D.. 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 /> 1. A pump must be selected to deliver at least <br /> .j."; <br /> yD gpm (Step A) with at least QJ feet of total head (Step B). <br />