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• <br /> PUMP SELECTION PROCEDURE <br /> A. Determine pump capacity: <br /> Gravity Distribution <br /> 1. Minimum suggested is 20 m <br /> 2. Maximum suggested 5 m Perforation Discharges in GPM <br /> Head Perforation diameter <br /> Pressure Distibution (feet) (inches) <br /> 3. a. Select number of perforated laterals 7/32 1/4 <br /> b. Select perforation spacing= feet. 1.0a 0.56' 0.74 <br /> c. Subtract 2 ft. from the rock layer length. 1.5 049 0.90 <br /> 20b 0.80 1.04 <br /> Reck layer length <br /> -2 ft.= feet. <br /> d. Determine the number of spaces between perforations. a Use 1.0 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. x perts,utuat= perforations. <br /> g. vas x 1pnv> = gpm. <br /> SELECTED PUMP CAPACITY l-1 S' gpm )1")A.)L <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 soil treatment system <br /> required at manifold if gravity system,zero. <br /> --- feet Total pipe length "s'/- <br /> 3. <br /> 3. Friction loss __ <br /> a. Enter friction loss table with gpm and pipe diameter. k Elevation Diff creme <br /> Read friction loss in feet per 100 feet from table(F-IA). pipe t M,w <br /> F.L.= "?,;� 'r. ft./100 ft of pipe ;s <br /> • <br /> b. Determine total pipe length from pump to discharge 7...-..-. .• <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 /> x 1.25= Li y 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. Nominal <br /> Total friction loss= 3•a x Li L) +100= 1 feet pipe clia. <br /> 4. Total head required is the sum of elevation difference, Flowte 1.5" 2" 3" <br /> special head requirements, and total friction loss. <br /> 20 2.47 0.73 0.11 <br /> + + 1 25 3.73 1.11 0.16 <br /> ' (1) (2) (3c) 30 5.2.3 1.55 0.2.3 <br /> 35 6.96 2.06 0.30 <br /> TOTAL HEAD /0 feet ` 1 2.28 0.39 <br /> 45 5 111..00 7 3.28 0.48 <br /> -50 13.46 3.99 0.58 <br /> 55 4.76 0.70 <br /> C. Pump selection 60 5.60 0.82 <br /> 65 6.48 0.95 <br /> 70 7.44 1.09 <br /> I . <br /> 1. A pump must be selected to deliver at least <br /> L-LC gpm (Step A) with at least /0 feet of total he (Step B). <br /> t--)A X <br />