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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 <br /> Perforation Discharges 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= 3 feet. 1.0a 0.56 0.74 <br /> C. Subtract 2 ft. from the rock layer length. 1.5 0.69 0.90 <br /> ���,-2 ft.=3 z ob o.fso 1.04 <br /> -��feet. <br /> d. Determine the number of spaces between perforations. a Use 1.0 foot single homes. <br /> Length perf.spacing=71- ft.+ 3 ft. = /,t_spaces b Use 2.0 feet for anything else. <br /> e. J.N- spaces+1 =z_perforationstlateral <br /> f. Multiply perforations per lateral b number of laterals to <br /> gee total number of perforations. x perforations. <br /> g. 7W x�= gpm. <br /> SELECTED PUMP CAPACITY _gpm <br /> B.Determine head requirements: <br /> 1. Elevation difference between pump and point of discharge. <br /> -9feet <br /> 2. If pumping to a pressure distribution system,five feet for pressure <br /> required at manifold if gravity system,zero. <br /> _'feet TOW>xa� <br /> Friction loss <br /> a. Enter friction loss table with gpm and pipe diameter. Ek„abm <br /> Didskasumm <br /> Read friction loss in feet per 100 feet from table(F-14). pipe <br /> F.L._ I SS' ft./100 ft of pipe - - - <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 length-1.25 times pipe length= <br /> Ibis- x 1.25= 13r feet Friction Loss in Plastic Pipe <br /> c. Calculate total friction loss by multiplying Nominal <br /> friction loss in ft/100 ft by equivalent pipe length. pipe dial <br /> Total friction loss= /3S x /S� +100= a feet <br /> 4. Total head required is the sum of elevation difference, HOgpm 1S" 2" 3" <br /> special head requirements,and total friction loss. <br /> ' ' 20 2.47 0.73 0.11 <br /> + + a 25 3.73 1 0.16 <br /> (1) (2) (3c) 30 5.23 1.55 0.23 <br /> 35 6.% 0.30 <br /> 40 8.91 2.64 0.39 <br /> TOTAL HEAD --q1 feet 45 11.07 3.28 0.48 <br /> 50 13.46 3.99 0.58 <br /> C. Pump selection 60 560 0.82 <br /> 65 6.48 0.95 <br /> 70 1 1 7.44 1 1.09 <br /> 1. A pump must be selected to deliver at least <br /> �` _gpm (Step A)with at least 2_ feet of total head (Step B). <br />