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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 �/3z �/4 <br /> b. Select perforation spacing= feet. l.oa o.56 0.74 <br /> c. Subtract 2 ft. from the rock layer length. i.5 0.69 0.90 <br /> Rocklayerlength <br /> -2 ft. = feet. 2.06 0.80 1.04 <br /> d. Determine the number of spaces between perforations. a Use�.o foot 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. ��r. x �r:s��= perforations. <br /> $• Per X�m,��= gPm. <br /> SELECTED PUMP CAPACITY 3S gpm <br /> B.Determine head requirements: <br /> 1. E�evation difference between pump and point of discharge. <br /> _��feet <br /> 2. If pumping to a pressure distribution system,five feet for pressure 5°il�'�"e"�Sys°�' <br /> required at manifold if gravity system,zero. °�°="�•°� <br /> _ f feet Total p�pe Imgrh <br /> 3. Friction loss <br /> a. Enter friction loss table with gpm and pipe diameter. ,,,,e ��atio„�;rre�„�e <br /> Read friction 1 ss 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 chart(F-15 feet). <br /> Equivalent pipe length- 1.25 times pipe length= <br /> �U X 125= So feet Friction Loss in Plastic Pipe <br /> c. Calculate total friction loss by multiplying <br /> friction loss in ft/100 ft by equivalent ipe length Nominal <br /> � L� _ � pipe dia. <br /> Total friction loss= .S-O x • 100= feet <br /> 4. Total head required is the sum of elevation difference, ���te 1.5" 2" 3" <br /> special head requirements,and total friction loss. <br /> 20 2.47 0.73 0.11 <br /> _��+ �- + � 25 3.73 1.11 0.16 <br /> (1) (2) (3c) 30 523 1.55 0.23 <br /> � 6.96 2.06 0.30 <br /> TOTAL HEAD �feet 8•91 ,�1.�'j 0.39 <br /> 45 11.07 �ZS 0.48 <br /> 50 13.46 3.99 0.58 <br /> 55 4.76 0.70 <br /> C. Pump selection 60 5.bo o.a2 <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 />