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9 <br /> PUMP SELECTION PROCEDURE <br /> A. Determine pump capacity: <br /> Gravity Distribution <br /> 1. Minunum suggested is 20 gpm <br /> 2. Maximum suggested is 45 gpm Perforation Discharges in GPM <br /> Pressure Distibution Head Perforation diameter <br /> feet inches <br /> 3.a. Select number of perforated laterals 7/32 �/4 <br /> b. Select perforation spacing= feet. 1.oa o.56 o.�a <br /> c. Subtract 2 ft. from the rock layer length. 1.5 0.90 <br /> 2.06 0.80 1.04 <br /> Rock layer length-2 ft. = fE'et. <br /> d. Determine the number of spaces between perforations. a Use 1.o Eooc single homes. <br /> Length perf.spacing= ft.= ft. = spaces <br /> b Use 2.0 feet for anything else. <br /> e. spaces+1 = perforations/lateral <br /> f. Multiply perforations per lateral by number of laterals to <br /> get total number of perforations. ���T x �r.5�7= perforations. <br /> b' perCs X gpm per gPm• )f <br /> SELECTED PUMP CAPACITYzO �Z gp� <br /> B.Deteraune 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 s�°�aa„�,�SYs�e"' <br /> required at manifold if gravity system,zero. °�°="�'�. <br /> _���feet TO�P�Pe��8� <br /> 3. Friction loss <br /> a. Enter friction loss table with gpm and pipe diameter. � .•- ElevationDiffetence <br /> Read friction loss in feet per 100 feet from table(F-14). P'�` <br /> ------- -- - <br /> F.L. _ . ft./100 ft of pipe _________________ _ _ <br /> b. Determine total pipe length from pump to discharge --""----'""-'-""-"------'--"""""'" <br /> point. Estimate by adding 25 percent to pipe length for fitting <br /> loss,or use a fitting loss chazt(F-15 feet). <br /> Equivalent pi e length-125 times pipe length= <br /> �70 x 1.25= z�z feet 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 <br /> pipe dia. <br /> Total friction loss= �,ss x Z/Z. =100=��feet <br /> F1ow Rate <br /> 4. Total head required is the sum of elevation difference, �m 1.5" 2" 3" <br /> special head requirements,and total friction loss. <br /> 20 2.47 0.73 0.11 <br /> �_+ � + � 25 3.73 0.16 <br /> (1) (2) (3c) 30 5.23 1.5 0.23 <br /> 35 6.96 2.06 0.30 <br /> TOTAL HEAD 2 d feet 40 8.91 2.64 0.39. <br /> 45 11.07 3.28 0.48 <br /> 50 13.46 3.99 0.58 <br /> C. Pump selection 60 5.60 o s2 <br /> 65 6.48 0.95 <br /> 70 7.44 1.09 <br /> / 1. A pump must be selected to deliver at least <br /> gpm (Step A) with at least �feet of total head (Step B). <br />