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� ' � PUMP SELECTION PROCEDURE <br /> A. Determine pump capacity: <br /> Gravity Distribution <br /> 1. Minimum suggested is 20 gpm <br /> 2. Maximttm suggested is 45 gpm Perforation Discharges in GPM <br /> Pressure Distibution Head Perforation diameter ' <br /> 3. a. Select number of perforated laterals 3 f� �/32 �/4 <br /> b. Select perforation spacing=�_fee� 1.Oa o.�� 0.�4 <br /> c. Subtract 2 ft.from the rock layer length. 1.5 0.69 0.90 <br /> ��-- -2 ft._�feet . 2ob o.so i.o4 <br /> x«k�,yn��,�en <br /> d. Determine the number of spaces between perforations. a Use 1.0 foot single homes. <br /> Length Pel�.SPaCiilg=f�c�ft.+ ;3 •U ft=�`� spaces b Use 20 feet for anytlung else. <br /> e. �� spaces+1= a�1 _perforations/lateral <br /> f. Multiply perforations per lateral by number of laterals to ��,��� <br /> get total number of perforations.� x �_��perforations. <br /> g. �.�. x�_��gpm. <br /> SELECTED PUMP CAPACTTY �{� gpm <br /> B.Determine head requirements: <br /> 1. Elevation difference between pump and point of dischazge. <br /> ��feet <br /> 2. 1f pumping to a pressure distribution system,five feet for pressure ��•�^�Sn�^ <br /> required at manifold if gravity stem,zero. a�b'°�a� �,^.� <br /> �feet �ria��s� <br /> 3: Friction loss <br /> a. Enter friction loss table with gpm and pipe diameter. ��,����� <br /> Read friction loss in feet per 100 feet from table(F-14). P'�` <br /> ....--- -- - <br /> F.L.= 3,'� ft./100 ft of pipe . ._.._._._ . . �, ,� <br /> b. Determine total pipe l�gth from pump to discharge <br /> ------------------------------------- f U <br /> point Estimate by adding 25 percent to pipe length for fitling <br /> loss,or use a fitting loss chart(F-15 feet). <br /> Equivalent pipe length-1.25 times p�e length= <br /> (oo x�.25= � � feet Friction Loss in Plastic Pi e <br /> c. Calculate total friction loss by multiplying Nominal P <br /> friction loss in ft/100 ft by equivalent pipe length. pipe dia. <br /> Total friction loss= 3,'� x '?J� +100=�_feet �oW�� <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 /> 11 + �� + 3 25 3.73 1.11 0.16 <br /> ' (1) (2) (3c) 30 5.23 1.55 0.23 <br /> 35 6.96 206 0.30 <br /> 40 8.91 264 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 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 �_feet of total hea�d(Step B). <br />