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, , <br /> PUMP SELECTION PROCEDURE <br /> A. Determine pump capacity: <br /> Gravity Distribution <br /> 1. Minimum suggested is 20 gpm <br /> 2. M3XiII1uII1 Sugg2StECl 1S 4S�IIl Perfontlon Diachuges in GPM <br /> Pressure Distibution Head Perforation diameter � <br /> feet inches <br /> 3. a. Select number of perforated lateraLs 3 7 32 1/4 <br /> b. Select perforation spacing=�_fee� 1.Oa o.56� 0.�4 <br /> c. Subtract 2 ft.from the rock layer length. 1s o.69 0.90 <br /> 2 it=�feet �.ob o.so i.o4 <br /> Rack Lyyer Iensth � <br /> d. Determute the number of spaces between perforations. a Use 1.0 foot single homes. <br /> Length perf.spacing=�ft.+�ft.=L spaces b Use 20 feet for anything eke. <br /> e. �spaces+1= 1 -! perfondons/lateral <br /> f. Multiply perforations per lateral by number of laterals to i�,��' <br /> get total number of perforahons.� x tis ie = 4 z perfomtions. <br /> $• ',�, x�m =�I 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. If pumping to a pressure distribuhon system,five feet for pressure �������=n� <br /> required at manifold if gravity s�stem,zero. ���b�`Q° -t!/ <br /> J feet r��►�b+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._�ft/100 ft of PiPe • ._.__. . . ,� l� <br /> b. Determine total pipe length from pump to dischazge � ------------------------------------ <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-1.25 times pipe length= <br /> 3 S x 1.25=�feet Friction Loss in Plastic Pi e <br /> c. Calculate total friction loss by multiplying Nominal P <br /> friction loss in ft/100 h by equivalent pipe length. <br /> Total friction loss= /�S- x L!�_+lpp s�_feet pipe dia. <br /> 4. Total head required is the sum of elevation difference, �ON'�� 1.5" 2" 3" <br /> special head requirements,and total frichon loss. �� <br /> 20 2.47 0.73 0.11 <br /> S + � +.�_ 25 3.73 1.11 0.16 <br /> ' (1) (2) (3c) g,�5 6.6 206 0.0 <br /> TOTAL HEAD �feet � 8.91 264 0.39 <br /> 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 6o s.bo o.sz <br /> b5 6.48 0.95 <br /> 70 7.44 1.09 <br /> 1. A pump must be selected to deliver at least <br /> 3� gpm (Step A)with at least �(_feet of total hea�i (Step B). <br />