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. , �, � � <br /> . • . . � 9 <br /> PUMP SELECTION PROCEDURE <br /> A. Determine pump capacity: <br /> Gravity Distribution <br /> 1. Minirnum 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= feet. 1.oa o.sb o.74 <br /> c. Subtract 2 ft.from the rock layer length. 1.5 0.69 0.90 <br /> -2 ft. = feet. 2.Ob 0.80 1.04 <br /> Rotk layer Imgth . <br /> d. Determine the number of spaces between perforations. a Use i.o foot single homes. <br /> Length perf.spacing= ft.= ft. = spaces 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. ��s x �r 5,a efA = perforations. <br /> S' T X Spm a�� - gPm• <br /> SELECTED PUMP CAPACITY_��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 s���ati^�,�Sr5«,,, <br /> required at manifold if gravity s tem,zero. a;°:'°�•a� <br /> � feet Tohl pipe length <br /> 3. Friction loss <br /> a. Enter friction loss table with gpm and pipe diameter. � . ��„���1Ce <br /> Read fricti n loss in feet per 100 feet from table(F-14). P'� <br /> �ft./100 ft of pipe <br /> F.L. _ , <br /> ................. . . <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 chart(F-15 feet). <br /> Equivalent pip�gth-1.25 times pi e length= <br /> 0 X �.25=�_feet Friction Loss in Plastic Pipe <br /> c. Calculate total fricHon loss by mulhplying Nominal <br /> friction loss in ft/100 t b equi le t ipe length. � <br /> Total friction loss= x-�-100= 2 Z feet pipe dia. <br /> 4. Total head required is the sum of elevation difference, ��m te 1.5" 2" 3" <br /> special head requirements,and total friction los . <br /> �+�_+ Z�Z Zo 2.4� 0.�3 o:ii <br /> 25 3.73 1.11 016 <br /> (1) (2) (3c) 30 5_23 1.55 0.23 <br /> � 35 6.96 2.06 0.30 <br /> 2G�feet 40 8.91 2.64 0.39 <br /> TOTAL HEAD 45 11.07 3.28 0.48 <br /> 50 13.46 3.99 0.58 <br /> 55 4.76 0.70 <br /> C. Pump selection bo s.bo o.s2 <br /> 65 6.48 0.95 <br /> 70 7.44 1.09 <br /> 1. A pump must be selected o deliver at least <br /> �gpm (Step A) with at least Z eet of total head (Step B). <br />