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M F-17 <br /> PUMP SELECTION PROCEDURE <br /> END PERFORATION OF A PERFORATED LATERAL <br /> A- Determine pump capacity: c...r.... <br /> Gravity Distribution TeoeW <br /> 1. Minimum suggested is 600 gallons per hour 00 gpiry to stay ahead of e,w.»,,»Palk(WNv <br /> water use rate. `L-W S&W neper '=.4., <br /> 2. Maximum suggested for delivery to a drop box of a home system is 2,700 M»No.CAP=qn IT""enm�eih <br /> eep <br /> gallons per hour(45 gpm)to prevent build-up of pressure in drop box. ..e,,.A»w -- -01 «e Edg. <br /> Pressure Distibution C»ee SOW L"W ee"M of L.#_1 <br /> 3.a. Select number of perforated laterals 3 <br /> b. Select perforation spacing= a_feet `SO- So yw <br /> C. Subttra;t 2 ft from the rock layer length. <br /> -� -2 ft._ '1 3 feet <br /> d. Determine the number of spaces between perforations. <br /> Length perf.spacing= 'L-5L ft.-t-_ZL__ft._Zk 4_spaces Required Perforation D;sch e <br /> e. �spaces+1=�,'�,perforations/lateral in gallons Per minute(gp.,> <br /> f. Multiply perforations per lateral by number of laterals to -ase ;2 <br /> get <br /> �inch PM <br /> get total number of perforations. W.,,_, x-- Q,,_�5 perforations. (feet) <br /> g. U x '`"-&'gpM. 1.0a 0.56 0.74 <br /> SELECTED PUMP CAPACITY 4Z gpm 2.Ob 0.80 1.04 <br /> B.Determine head requirements: a.Use for single family homes <br /> 1. Elevation difference between pump and point of discharge. b.Use for all other applications <br /> _ .< feet <br /> 2. If pumping to a pressure distribution system,five feet for pressure <br /> required at manifold if gravity stem,zero. <br /> 16 feet <br /> 3. Friction loss <br /> a. Enter friction loss table with gpm and pipe diameter. Pipe Length <br /> Read friction loss in feet per 100 feet from table. Point of Discharc <br /> F.L.= 2,ie.' ft/100 ft of pipe TJoao <br /> b. Determine total pipe length from pump to discharge Elevation Difference l <br /> point Add 25 percent to pipe length for fitting pwn,p a a <br /> loss,or use a fitting loss chart. Equivalent pipe <br /> length-1.25 times pipe length= F-18b <br /> /D O x 1.25= LIZ feet <br /> c. Calculate total friction loss b multiplying1.5 inch 2.0 inch 3.0 inch <br /> Y Sent Frict�=,a.a.,aonof pipe <br /> friction loss in ft/100 ft by equivalent ipe length. <br /> Total friction loss= 2.5� x 1 L j +100=_ feet 10 0.69 0.20 <br /> 12 0.96 0.28 <br /> 4. Total head required is the sum of elevation difference, 14 1.28 0.38 <br /> special head requirements,and total friction loss. 16 1.63 0.48 <br /> 18 2.03 0.60 <br /> 20 2.47 0.73 0.11 <br /> +�_+ 25 3.73 1.11 0.16 <br /> (1) (2) (3c) 30 5.23 1.55 0.23 <br /> 35 7.90 2.06 0.30 <br /> 40 11.07 2.64 0.39 <br /> TOTAL HEAD _feet 43- 14.73 3.28 0.48 <br /> 50 3.99 0.58 <br /> 55 4.76 0.70 <br /> C. Pump selection 60 5.60 0.82 <br /> 1. A pump must be selected to deliver at least <br /> �D gpm (Step A)with at least j y, feet of total head(Step B). <br />