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9 <br /> PUMP SELECTION PROCEDURE <br /> A. Determine pump capacity: <br /> Gravity Distribution <br /> 1. Minimum suggested ' g m _ <br /> 2. Maximum suggested 5 4 Pm Perforation Discharges in GPM <br /> Pressure Distibution Head Perforation diameter <br /> feet inches <br /> 3. a. Select number of perforated laterals �/s2 i/4 <br /> b. Select perforation spacing= feet. 1.oa o.56 0.74 <br /> c. Subtract 2 ft. from the rock layer length. �.5 0.69 0.90 <br /> RocJc layer IengN <br /> -2 ft. = feet. 2.ob o.so 1.04 <br /> d. Determine the number of spaces between perforations. a Use�.o foot single homes. <br /> Length perf.spacing= ft.= ft. = spaces b Use z.o 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 /> S. pT x�,m,�= gpm. <br /> SELECTED PUMP CAPACI�-���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�''�'""��SYs�e»' <br /> required at manifold if gravity system,zero. °�°="�'°� <br /> „B-- feet T°�'P'�'�'gm <br /> 3. Fnction loss <br /> a. Enter friction loss table with gpm and pipe diameter. ,,,le ElevationDifference <br /> Read friction loss in feet per 100 Eeet from table(F-14). P'� • <br /> ------- -- - <br /> F.L. - 2 ft./100 ft of pipe <br /> _..- - <br /> b. Detemune 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 pipe length-125 times i e length= <br /> ��X 125=��feet Friction Loss in Plastic Pipe <br /> c. Calculate total friction loss by multiplying <br /> friction loss in ft/100 ft b equiva e pipe length Nominal <br /> ,a7� �[3' �_ pipe dia. <br /> Total friction loss= �.,�.L x 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 /> �_+ d + .� 25 3.73 1.11 0.16 <br /> (1) (2) (3c) 30 5.23 1.55 0.23 <br /> 35 6.96 2.06 0.30 <br /> 40 8.91 2 64 0.39 <br /> TOTAL HEAD �+Z feet 45 11.07 � 0.48 <br /> 50 13.46 3.99 0.58 <br /> 55 4.76 0.70 <br /> C. Pump selection bo 5.bo o.s2 <br /> 65 6.48 0.95 <br /> 70 7.44 1.09 <br /> � l. A pump must be selected to deliver at least <br /> gpm (Step A) with at least �� feet of total head (Step B). <br />