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� 9 <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 /> Pressure Distibution Head Perforation diamerer <br /> feet inches <br /> 3.a. Select number of perforated laterals 7/32 1/4 <br /> b. Select perforation spacing= feet. 1.oa o.56 0.74 <br /> c. Subtract 2 ft.from the rock layer length. i.5 0.69 0.90 <br /> R«�iaYe���,g�n-2 ft. = feet. <br /> 2.Ob 0.80 1.04 <br /> d. Determine the number of spaces between perforations. a Use 1.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. ��� x ��5���= perforations. <br /> g. T x�m�.�= gpm. <br /> SELECTED PUMP CAPACITY�gpm <br /> B.Deteratine head requirements: <br /> 1. Ekvation difference between pump and point of discharge. <br /> �feet <br /> 2. If pumping to a pressure distribution system,five feet for pressure 5°°�'�"�SYs�e"' <br /> required at manifold if gravity s�stem,zero. °'°="=°� <br /> •S feet Total pipe Ic�gth <br /> 3. Friction loss <br /> a. Enter friction loss table with gpm and pipe diameter. ,,,� . ae1,,�„�,p„tt <br /> Read friction loss in feet per 100 feet from table(F-14). P`� <br /> ------- -- - <br /> F.L._�ft./100 ft of pipe <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 pipe length-1.25 times i e length= <br /> _��x 1.25=�r�feet Friction Loss in Plastic Pipe <br /> c. Calculate total fnchon loss by multiplying <br /> Nominal <br /> friction loss in R/1 ft b equivale pipe length. � pipe dia. <br /> Total friction loss= x_'1�-100=�feet 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 1.11 0.16 <br /> (1) (2) (3c) 30 5.23 � 0.23 <br /> 35 6.96 2.06 0.30 <br /> /Q 40 8.91 2.64 0.39 <br /> / <br /> TOTAL HEAD �feet 45 11.07 3.28 0.48 <br /> 50 13.46 3.99 0.58 <br /> C. Pump selection bo 5.bo 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 /> zCI gpm (Step A) with at least��feet of total head (Step B). <br />