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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 diameter <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. 1.5 0.69 0.90 <br /> Rotk layer length <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 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. �e� 5 x �r s,�e T = perforations. <br /> $. � x��= gPm. <br /> SELECTED PUMP CAPACITY � ( 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 So�treatment system <br /> required at manifold if gravity s stem,zero. °�°='°�"°� <br /> �feet Total pipe lenqth <br /> 3. Friction loss <br /> a. Enter friction loss table with gpm and pipe diameter. ,,,,e � Elevation UHeience <br /> Read fnction 1 ss in feet per 100 feet from table(F-14). P`� - <br /> _�ft./100 ft of pipe <br /> F.L. = 1 r ,�� <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 chazt(F-15 feet). <br /> Equivalent pipe length-1.25 times pipe 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 by equivalent pipe length. <br /> Nominal <br /> � pipe dia. <br /> Total friction loss= ��'�� x � ���=`- =100=�_feet <br /> 4. Total head required is the sum of elevation difference, ��m te 1.5" 2" 3" <br /> special head requirements,and total friction loss. <br /> � -� 20 2.47 0.73 0.11 <br /> f + �� + 25 3.73 1.11 016 <br /> (1) (2) (3c) 30 5.23 1.55 0.23 <br /> 35 6.96 �,.9� 0.30 <br /> 40 8.91 �64) 0.39 <br /> TOTAL HEAD /�. feet 45 11.07 �-32g 0.48 <br /> 50 13.46 3.99 0.58 <br /> C. Pump selection bo 5.60 o.s� <br /> 65 6.48 0.95 <br /> 70 7.44 1.09 <br /> 1. A pump must be selected to deliver at least <br /> :�7 gpm (Step A) with at least � feet of total head (Step B). <br />