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f <br /> PUMP SELECTION PROCEDURE <br /> A. Determine pump capacity, <br /> Gravity Distribution <br /> 1. Minimum suggested is 20 gpm <br /> 2. Maximum suggested is 45 gpm Perforation Discharges in GPM <br /> Head Perforation diameter <br /> Pressure Distibution feet inches <br /> 3.a. Select number of perforated laterals 7/32 1/4 <br /> b. Select perforation spacing= 3 feet. 1.0a 0.56' 0.74 <br /> C. Subtract 2 ft.from the rock layer length. 1S 0.69 0.90 <br /> "11 -2 ft.= 3 feet. lob 0.80 1.04 <br /> l <br /> Rak ayer le�th <br /> d. Determine the number of spaces between perforations. a Use 1.0 foot single homes. <br /> Length perf.spacing=22-ft.+ 3 ft.= )-7,-spaces b Use 2.0 feet for anything else. <br /> e. spaces+1 =.J�-_perforations/lateral <br /> f. Multiply perforations per lateral by number of laterals to ►)y �v, . <br /> get total number of perforations. � x _ L• k- perforations. <br /> g x 11'i. =-L.gpm. <br /> pop- <br /> SELECTED PUMP CAPACITY Z I_gpm <br /> B.Determine head requirements: <br /> 1. Elevation difference between pump and point of discharge. <br /> _feet <br /> 2. if pumping to a pressure distribution system,five feet for pressure SCW UUMU"aYMM <br /> required at manifold if gravitys stem,zero. <br /> feet Tow pipe keno /C;ti <br /> 3. Friction loss <br /> a. Enter friction loss table with gpm and pipe diameter. I„k ne1a,a„Wmwe <br /> Read friction loss in feet per 100 feet from table(F-14). Pipe <br /> F.L.=L_ft./100 ft of pipe �.....- <br /> r <br /> b. Determine total pipe length from pump to discharge - 1................ ..... . <br /> point. Estimate by adding 25 percent to pipe length for fitting <br /> loss,or use a fitting loss chart(F-15 feet). <br /> Equivalent pipe length-1.25 times pipe length= <br /> )1)D x 1.25= ;kfeet Friction Loss in Plastic Pipe <br /> c. Calculate total friction loss by multiplying <br /> friction loss in ft/100 ft by equivalent pipe length. Nominal e <br /> Total friction loss= / 1. x �1 a +loo= 3 feet <br /> te <br /> 4. Total head required is the sum of elevation difference, H0 m 1.5" 2" 3" <br /> special head requirements,and total friction loss. <br /> 20 2.47 0.73 0.11 <br /> 11 + .5' +-_ 25 3.73 1.11 0.16 <br /> (1) (2) (30 30 5.23 1.55 0.23 <br /> 35 6.96 2.06 0.30 <br /> 40 8.91 2.64 0.39 <br /> TOTAL HEAD /2_feet 45 11.07 3.28 0.48 <br /> 50 13.46 3.99 0.58 <br /> C. Pump selection 60 560 0.70 s2 <br /> 65 6.48 0.95 <br /> 70 1 1 7.44 1 1.09 <br /> 1. A pump must be selected to deliver at least <br /> -L) gpm (Step A)with at least 1-�feet of total head (Step B). <br />