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PUMP SELECTION PROCEDUR <br /> A. Determine pump capacity: <br /> Gravity Distribution <br /> 1. Minimum suggested is 20 gpm <br /> 2. Maximum suggested is 45 gpm <br /> Pressure Distibution <br /> 3. a. Select number of perforated laterals Perforation Discharges in GPM <br /> b. Select perforation spacing= feet. Head Perforation diameter <br /> c. Subtract 2 ft.from the rock layer length (feet) (inches) <br /> Rock layer teKth-2 ft.= feet. 7/32 1/4 <br /> d. Determine the number of spaces between perforations. 1.0a 056 0.74 <br /> Length perf.spacing= ft.+ ft.= spaces 1.5 0.69 0.90 <br /> 2.0b 0.80 1.04 <br /> e. spaces+1= perforations/lateral <br /> f. Multiply perforations per lateral by number of laterals to a Use 1.0 foot single homes. <br /> get total number of perforations. T x . = perforations. <br /> b Use 2.0 feet for anything else. <br /> g. mr xworm gpm. <br /> SELECTED PUMP CAPACITY 3 £s' gpm <br /> B. Determine head requirements: <br /> Sod treatment system <br /> 1. Elevation difference between pump and point of discharge. °`N:4=7. <br /> _ feet Total pipe length <br /> 2. If pumping to a pressure distribution system,five feet for pressure <br /> required at manifold if gravity system,zero. oir <br /> S" feet Elevation Difference <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). <br /> F.L. = a.c,y ft./100 ft of pipe <br /> b. Determine total pipe length from pump to discharge Friction Loss in Plastic Pipe <br /> point. Estimate by adding 25 percent to pipe length for fitting Nominal <br /> loss,or use a fitting loss chart(F-15 feet). pipe dia. <br /> Equivalent pipe length-1.25 times pipe length= F1ow,Rate <br /> Ss x 1.25= G 9 feet gpm 1.5.. 2" 3" <br /> c. Calculate total friction loss by multiplying <br /> friction loss in ft/100 ft by equivalent pipe length. 20 2.47 0.73 0.11 <br /> Total friction loss= G 9 x a,1.4 - +100 in 2- feet ' 25 3.73 1.11 0.16 <br /> 4. Total head required is the sum of elevation difference, 30 5.23 1.55 0.23 <br /> special head • 40_ 6.96 2. 0.30 <br /> p requirements,and total friction lots. 40 8.91 �s 64j 0.39 <br /> • 45 11.07 8 0.48 <br /> . /1' + 5- + -D-- 50 13.46 3.99 0.58 <br /> (1) (2) O 55 4.76 0.70 <br /> 60 5.60 0.82 <br /> 65 • 6.48 0.95 <br /> TOTAL HEAD ?U feet • " 70 7.44 1.09 <br /> C. Pump selection • . <br /> • <br /> 1. A pump must be selected"to deliver at least <br /> 3 gpm (Step A) with at least 2c2 feet of total head(Step B). <br />