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F-17 <br /> 1 PUMP SELECTION PROCEDURE <br /> END PERFORATION OF A PERFORATED LATERAL <br /> A. Determine pump capacity: re... <br /> Gravity Distribution <br /> 1. Minimum suggested is 600 gallons per hour(10 gpm)to stay ahead of - N.,x.�.k ca I.- <br /> water use rate. <br /> Low"5"°`°"' '�`,,c�,W r w.„a,," <br /> 2. Maximum suggested for delivery to a drop box of a home system is 2,700 �fk^W 1"�w.'�Wfy <br /> �� <br /> gallons per hour(45 gpm)to prevent build-up of pressure in drop box. :.,.ft„ - ,E,,. <br /> P.% L vv <br /> Pressure Distibution Coo=Saw u,. a,-,.� W �� <br /> 3.a. Select number of perforated laterals 3 <br /> b. Select perforation spacing=�_feet. �Ps""Sam scwwwd <br /> C. Subtract 2 ft.from the rock layer length. <br /> /_ ,-2ft.= [a feet. <br /> d. Determme the number of spaces between perforations. <br /> Length perf.spacing=1PI•-ft.+ ft._.�'�spaces Required Perforation Discharge <br /> e. 2a spaces+1= &3_perforations/lateral in g d1ons Per minute <br /> f. Multiply perforations per lateral b number of laterals to � ge <br /> get total number of perforations. x _ perforations. <br /> g- 46% xHaj� '"'� `�Pd <br /> ��=22��'- 1.0a 0.74 <br /> SELECTED PUMP CAPACTIY _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 /> 1 2. If pumping to a pressure distribution system,five feet for pressure <br /> J required at manifold if gravityVstem,zero. <br /> -,S 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 Discharge <br /> F.L.= : to ft/100 ft of pipe /dal -o <br /> b. Determine total pipe length from pump to discharge EUvation Difference <br /> point. Add 25 percent to pipe length for fitting pip <br /> loss,or use a fitting loss chart. Equivalent pipe <br /> length-1.25 times pipe length= <br /> a16 x 1.25= _feet F-18b <br /> 1S inch 2.0 inch a <br /> c. Calculate total friction loss bmultiplyinginch <br /> Y gpm i=�m>�taoaor�pe� <br /> friction loss in ft/100 ft by equivalent pipe length. 10 0.69 0.20 <br /> Total friction loss= �cK x a . b +100=�_feet 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 /> o� +�_+ 25 3.73 1.11 0.16 <br /> (1) (2) (30 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 ;3 1 feet 45 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 /> gpm (Step A)with at least _feet of total head(Step B). <br />