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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 /> Head Perforation diameter <br /> Pressure Distibution 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. 1.5 0.69 0.90 <br /> Rodc layer length <br /> -2 ft. = feet. 2.ob o.so i.oa <br /> d. Determine the number of spaces between perforations. a Use�.o fooc 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. �5 x � 5���= perforations. <br /> g. �r x�m�= gpm. <br /> SELECTED PUMP CAPACITY�gpm <br /> B.Determine head requirements: <br /> 1. Elevation difference betwee�p and point of discharge. <br /> feet <br /> 2. If pumping to a pressure distribution system,five feet for pressure S°°r�'°^e^�SYS«, <br /> required at manifold if gravity s stem,zero. ��°�'°�'a: <br /> _r�feet Total p�pe length <br /> 3. Fnction loss <br /> a. Enter friction loss table with gpm and pipe diameter. �„�e Elevation Difference <br /> Read fricrion loss in feet per 100 feet from table(F-14). P'� - <br /> F.L. =3•T 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 len th- 1.25 times pipe length= <br /> �X �25= / Z feet Friction Loss in Plastic Pipe <br /> c. Calculate total fricrion loss by multipiying <br /> friction loss in ft/100 ft by equivalent pipe length. Nominal <br /> pipe dia. <br /> Total friction loss= ��x � � /Z =100=_�feet <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 3_99 0.58 <br /> 55 4.76 0.70 <br /> C. Pump selection 60 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 /> �gpm (Step A) with at least 3z feet of total head (Step B). <br />