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�UMP SELECTION PROCEDURE <br /> A. Determine pump capacity: <br /> Gravity Distribution <br /> 1. Minimum suggested is 20 gpm <br /> 2. Maximum suggested is 45 gpm Perfontion Discharges in GPM <br /> Head Perforarion diameter <br /> Pressure Distibution f�� ���� <br /> 3. a. Select number of perforated lateraLs � �/32 1/4 <br /> b. Select perforation spacing= J feet. i.oa o.56 0.�4 <br /> c. Subtract 2 ft. from the rock layer length. �.5 0.69 0.90 <br /> %� -2 ft._ ')� feet. . 2ob o.so i.o4 <br /> x«��y«iQ,�, <br /> d. Determine the number of spaces between perforations. a Use�.o foot si�,gle homes. <br /> Length perf.spacing= f/ ?, ft.+'---' ft._ ��� spaces b Use 2.0 feet for anything else. <br /> e. --� spaces+ 1 = o.�� perforations/lateral <br /> f. Multiply perforations per lateralby number of laterals to ���,�' <br /> get total number of perforations. �� x � � _ �� perforations. <br /> - �,- � s per 5 r�rr <br /> g. � x �'�a= L � Spm. <br /> SELECTED PUMP CAPACITY y a. gpm <br /> B.Detemune head requirements: <br /> 1. Elevation difference between pump and point of dischazge. <br /> �_feet <br /> 2. If pumping to a pressure distribution system,five feet for pressure s�a�_���5�«m <br /> required at manifold if gravity system,zero. ��•�b�••Q� _ - <br /> � feet Tohl pipe Im� <br /> � <br /> 3. Friction loss <br /> a. Enter friction loss table with gpm and pipe diameter. w� ��,ati����� <br /> Read Eriction loss in feet per 100 feet hom table(F-14). P'�` <br /> ., ..----- -- - <br /> F.L. = P'. � ft./100 ft of pipe `, <br /> ._..........-- - <br /> b. Determine total pipe length from pump to dischazge ------------------------------------- � , <br /> point. Fstimate by adding 25 percent to pipe length for fitting <br /> loss,or use a fitting loss chart(F-15 feet). <br /> Equivalent pipe length- 1.25 times pipe length= <br /> ��x 1.25= -�_feet Friction Loss in Plastic Pi e <br /> c. Calculate total friction Ioss by multiplying P <br /> friction loss in ft/100 ft by equivalent pipe length. Nominal <br /> Total friction loss= :�. `/ x ��" � +100= a feet pipe dia. <br /> 4. Total head required is the sum of elevation difference, Flow Rate 1.5" 2" 3" <br /> special head requirements,and total friction loss. �� <br /> 20 2.47 0.73 0.11 <br /> L + � + � 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 /> TOTAL HEAD �feet 40 8.91 264 0.39 <br /> 45 11.07 3.28 0.48 <br /> 50 13.46 3.99 0.58 <br /> C. Pum selection 5� 4.76 0.70 <br /> P 60 5.60 0.82 <br /> 65 6.48 0.95 <br /> 7n ��n 1.0? <br /> 1. A pump must be selected to deliver at least <br /> � - gpm (Step A) with at least �_ feet of total head (Step B). <br />