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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. Maximum suggested is 45 gpm Perforation Discharges in GPM <br /> Head Perforation diameter <br /> Pressure Distibution (feet) (inches) <br /> 3. a. Select number of perforated laterals 3 7/32 1/4 <br /> b. Select perforation spacing= 3. 0 feet. 1.0a 0.56 0.74 <br /> c. Subtract 2 ft. from the rock layer length. 15 0.69 0.90 <br /> L' -2 ft.= L V feet. 2.Ob 0.80 1.04 <br /> Rock layer length <br /> d. Determine the number of spaces between perforations. a Use 1.0 foot single homes. <br /> Length pelf.spacing= L u, ft.+3 ft.=..spaces b Use 2.0 feet for anything else. <br /> e. 3'- spaces+1 = D`S, perforations/lateral l <br /> f. Multiply perforations per lateral by number of laterals to 11,i.,„q. (. x, m ,,,) <br /> get total number of perforationsu, x . .571r_ C.,,c7 perforations. <br /> g. 4. x =2,-L gpm. <br /> SELECTED PUMP CAPACITY S ) gpm <br /> B.Determine head requirements: <br /> 1. Elevation difference between pump and point of discharge. <br /> 1 L- feet <br /> 2. If pumping to a pressure distribution system,five feet for pressure 5oil tenement system <br /> required at manifold if gravity system,zero. <br /> S feet Total pipe length ' <br /> 3. Friction loss <br /> a. Enter friction loss table with gpm and pipe diameter. 1k -°�'- Elevation DIffemue <br /> Read friction loss in feet per 100 feet from table(F-14). PIP* I <br /> F.L. = 1--1.0 ft./100 ft of pipe r (6---2_ <br /> b. Determine total pipe length from pump to discharge t.,, I • <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 /> 1- x 1.25= 1 qd a 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= u • C x I '-Z_ -100= 1-1 feet pipe dia. <br /> 4. Total head required is the sum of elevation difference, Flowto 1.5" 2" 3" <br /> special head requirements,and total friction loss. <br /> 20 2.47 0.73 0.11 <br /> Lo + < + 17 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 /> 40 8.91 2.64 0.39 <br /> TOTAL HEAD a `d feet 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 60 5.60 0.82 <br /> 65 6.48 0.95 <br /> 70 7.44 1.09 <br /> 1. A pump must be selected to deliver at least <br /> S 1 gpm (Step A) with at least a feet of total head (Step B). <br />