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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 0.74 <br /> c. Subtract 2 ft.from the rock layer length. 1.5 0.90 <br /> Rock layer length <br /> -2 ft. = feet. z.ob o.so i.o4 <br /> d. Determine the number of spaces between perforations. a Use i.o fooc single homes. <br /> Length perf.spacing= ft.= ft. = spaces b Use 2.0 teet 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�r x �r 5,�e�� = perforations. <br /> g. T x�m �r = gpm. <br /> SELECTED PUMP CAPACITY,��gpm <br /> B.Determine head requirements: <br /> 1. Elevation difference between pump and point of discharge. <br /> __j__�feet <br /> 2. If pumping to a pressure distribution system,five feet for pressure Soil t�eatmentsystem <br /> required at manifold if gravity s stem,zero. °�°="='o• <br /> ��feet Total pipe lengrh <br /> 3. Friction loss �4� <br /> a. Enter friction loss table with gpm and pipe diameter. r„�e .- Elevation Diffeience <br /> Read friction loss in feet per 100 feet from table(F-14). P`� <br /> ------- -- - <br /> F.L._ •O(o 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-125 times ip length= <br /> 'JS_. X 1.25=�feet Friction Loss in Plastic Pipe <br /> c. Calculate total friction loss by multiplying <br /> Nominal <br /> friction loss in ft/100 ft y equivalent pipe length. pipe dia. <br /> Total friction loss= �,x�¢f�=100= 2- feet �ow 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 /> � �" +_� + � 25 373 1.11 0.16 <br /> (1) (2) (3c) � 523 0.23 <br /> 6.96 0.30 <br /> 40 8.91 2.64 0.39 <br /> TOTAL HEAD �_feet 45 11.07 3.28 0.48 <br /> 50 13.46 3.99 0.58 <br /> C. Pump selection bo 5.60 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 />