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,. <br />.� 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 /> Pressuie Dlstibution Head Perforation diameter <br /> feet inches <br /> 3.a. Select number of perforated laterals 7/32 1/4 <br /> b. Select perforation spacing= feet. �.oa o.56 0.74 <br /> c. Subtract 2 ft. from the rock layer length. �.5 0.69 0.90 <br /> Rock layer length <br /> -2 ft. = feet. 2.ob o.8o t.o4 <br /> d. Determine the number of spaces between perforations. a Use�.o foot sing►e 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 /> S' pT X�m�aa- PPm• � <br /> i <br /> SELECTED PUMP CAPACI'TY S�S �'pm <br /> B.Determine head requirements: <br /> 1. Elevarion difference between pump and point of discharge. <br /> ��feet <br /> 2. If pumping to a pressure distribution system,five feet for pressure SoJ tteatrnent system <br /> required at manifold if gravity system,zero. Q;°�"�•o; <br /> �Sr feet Total p�pe la�gth <br /> 3. Friction loss <br /> a. Enter friction loss table with gpm and pipe diameter. �e <br /> Elevatlon Difference <br /> Read fric �on loss 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- 125 times pipe length= <br /> Zo o X �25= 2so feet Friction Loss in Plastic Pipe <br /> c. Calculate total friction loss by multiplying <br /> friction loss in ft/1�0�f,�t by equivalent pipe length. Nominal <br /> Total friction loss= Y. / �x�_=100=�feet pipe dia. <br /> Flow 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 /> S- +��-- 25 3.73 1.11 0.16 <br /> (1) (2) (3c) 30 523 1.55 0.23 <br /> 35 6.96 2.06 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 0.58 <br /> 55 4.76 0.70 <br /> C. Pump selection 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 /> gpm (Step A) with at least Z� feet of total head (Step B). <br />