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PUMP SELECTION PROCEDURE <br /> - A. Determine pump capacity: <br /> Gravity Distribution END PERFORATION OF A PERFORATED LATERAL <br /> 1. Minimum suggested is 600 gallons per hour(10 gpm) to stay ahead of moo.... c.." <br /> water use rate. . <br /> 2. Maximum suggested for delivery to a drop box of a home system is 2,700 (7,�T -•- --•�'`i, <br /> Ley" e1 re.4'.INe /eW1c (r 4'r• <br /> gallons per hour(45 gpm) to prevent build-up of pressure in drop box. t.ea^y 5•M Lap*, 'Z 1�'e r nee.e.,e.a <br /> tnI..e1 .epee,.o.nI <br /> ,"'e•at 9 ;•.tom• Per lr.11e., 0.114' r 4. <br /> 1 Nw1..., <br /> Pressure Distribution �, �.•hw - -Al t,.,l I:•1. Epee <br /> IMcv. Nee. lop <br /> 3. a. Select number of perforated laterals awing, r1e11.aeq., e1 /MP Lola <br /> b. Select perforation spacing= ? ft. P"Ir.14'm teem)., .t <br /> c. Subtract 2 ft. from the rock layer length. Leroy 11•111•11...else.sane Leroy L.1,.•I <br /> Li I <br /> Noillye.1,.,,et,-2 ft._ 39 ft. , _ -. <br /> o,l.leel sell P.epe.ly Scarified <br /> Beier,Pl.clrq Send Ley" <br /> d. Determine the number of spaces between perforations. <br /> Length pert.spacing= 39 ft.+ 3 it.= 13 spaces TABLE OF PERM/RATION DISCHARGES IN GPM <br /> e. I '7, spaces+ 1 = 114 perforations/lateral <br /> f. Multiply perforations per lateral by number of laterals to Head Perforation diameter(inches) <br /> get total number of perforations. _ I �� 1/e <br /> it,ITe x __ 1ff - 4 D perforations. J " <br /> 1.0a 036 0.74 <br /> 90 <br /> x1�y _ mg. t, I. - - -gp • <br /> 2.01.1 0.80 104 <br /> 2S 0.89 1.17 <br /> SELECTED PUMP CAPACITY .3 3.0 0.981.28 <br /> gpm 4.0 1 1.1133 1.47 <br /> 5.0 126 1.65 <br /> B.Determine head requirements: aUre 1.0 foot of head for residential systems. <br /> 1. Elevation difference between pump and point of discharge. bUse 2.0 feet of head for other establishments <br /> 3 I feet <br /> 2. If pumping to a pressure distribution system,add five feet for pressure <br /> required at manifold <br /> feet <br /> 3. Friction lossPipc Length <br /> I t <br /> a. Enter friction loss table with gpm and pipe diameter. Point of Discharge <br /> Read friction loss in feet per 100 feet from table. 1 9' <br /> F.L.= /. G ft./100 ft of pipe Elevation Difference <br /> b. Determine total pipe length from pump to discharge pump <br /> point. Add 25 percent to pipe length for fitting <br /> loss,or use a fitting loss chart. Equivalent pipe F-18b <br /> length-1.25 times pipe length= 1.5 inch 2.0 inch 3.0 inch <br /> 4 P.O x 1.25 = S2,4"-- feetspm Friction ton per 100 Rol pipe <br /> c. Calculate total friction loss by multiplying 10 0.69 0.20 <br /> friction loss in ft/100 ft by equivalent pipe length. 12 0.96 0.28 <br /> Total friction loss= /. (- x S'-? S' +100= </ feet 14 1.28 0.38 <br /> 4. Total head required is the sum of elevation difference, 16 0.48 <br /> 18 2 3 0.60 <br /> special head requirements,and total friction loss. 20 2.47 0.73 0.11 <br /> 25 3.73 1.11 0.16 <br /> I + 5-- ••+ ir 30 5.23 1.55 0.23 <br /> 35 7.90 2.06 0.30 <br /> (1) (2) '�(3c) 40 11.07 2.64 0.39 <br /> 45 14.73 3.28 0.48 <br /> TOTAL HEAD H `4 feet 50 3.99 038 <br /> 55 4.76 0.70 <br /> 60 5.60 0.82 <br /> Pump selection <br /> 1. A pump must be selected to deliver at least 3 I gpm (Step A) <br /> with at least Lau feet of total head (Step B). <br />