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• • , <br /> PUMP SELECTION PROCEDURE • . <br /> • <br /> • <br /> A. Determine pump capacity: <br /> • Gravity DistributionEND PERFORATION OF A PERFORATED LATERAL <br /> 1. Minimum suggested is 600 gallons per hour(10 gpm)to stay ahead of s.aw can <br /> water use rate. ;i <br /> 2. Maximum suggested for delivery to a drop box of a home system is 2,700 -:.,. " .,.:'': ;� <br /> gallons per hour(45 gpm)to prevent build-up of pressure in drop box. ' "'i:.er hist.WV ' ge»14�'w-.W <br /> I Th1 1:r as,r--w�e MI. I UMIwM r <br /> Pressure Distribution f <br /> 3. a. Select number of perforated laterals 3 . .....7111167 "�'"' "'""" <br /> oar., �. N NM tier <br /> b. • Select perforation spacing= .3ft. ;•W'•..t:• ....: ` P«teen.n:'WON N <br /> C. Sub ract 2 ft.from the rock layer length. K.!. clam Send Lew a"""'of Wu* <br /> -2ft.=..T. ft. <br /> Sohn r <br /> d. Determine the number of spaces between perforations. <br /> Length perf.spacing= ft.+..,1_ft.•_LZ spaces TABU OP PERFORATION DI9CHARCfS IN CPM <br /> e. 1 spaces+1= 1 4 perforations/lateral <br /> f. Multiply perforations per lateral by number of laterals to Head Perforation diameter(Inches) <br /> get total number of perforations. rin y41 <br /> rte'. x „41.11.xy perforations. <br /> 1.0a ' 036 0.74 <br /> S1-4 .'1�NN <br /> 8• x _ 13 0.69 <br /> 2. o 9 .0.90 <br /> 2.314 <br /> 17 <br /> SELECTED PUMP CAPACITY L D3.0 o. 1.27 <br /> gpm 4A 1.13 1.47 <br /> 5.0 1.26 1.65 <br /> B.Determine head requirements: sues 1.0 root of head for residentid.ystema. <br /> 1. Elevation difference between pump and point of discharge. . Wee 2.0 feet of head for other establishments <br /> 1 O feet . <br /> 2. If pumping to a pressure distribution system,add five feet for pressure <br /> required at manifold <br /> ___„'feet • <br /> 3. Friction lossh Pipe Length f <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. 9< <br /> F.L.= D• (.1-1 ft./100 ft of pipe . Elevation Difference <br /> b. Determine total pipe length from pump to discharge . Pump is ce- <br /> point. Add 25 percent to pipe length for fitting . . <br /> loss,or use a fitting loss chart. Equivalent pipe 12-18b <br /> length-1.25 Mmes pipe length= • 13 inch 2.0 inch 3.0 inch <br /> 41-n • x 1.25= So feet gpm Prialaa tae per 100!1 at pipe <br /> c. Calculate total friction loss by multiplying • <br /> 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= , �. l0'-1 ,x ... ..17 +.100= 1 feet 14 1.28 0.38 <br /> 4. Total head required is the sum of elevation difference, 18 2 03 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 /> -La-+ +--2---_ 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 Pie, feet 50 • 3.99 038 <br /> 55 •4.76 0.70 <br /> 60 5.60 0.82 <br /> C. Pump selection <br /> 1. A pump must be selected to deliver at least Li 0 gpm (Step A) • <br /> with at least feet of total head (Step B). . <br /> 14 6 <br />