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F-17 <br /> PUMP SELECTION PROCEDURE <br /> END PERFORATION OF A PERFORATED LATERAL <br /> A. Determine pump capacity: w-c-- . <br /> Gravity Distribution <br /> 1. Minimum suggested is 600 gallons per hour(10 gpm)to stay ahead of - ,,�.,»„�.rae.k ca ft._ <br /> water use rate. " h'o-o'..WO C-1" <br /> 2. Maximum suggested for delivery to a drop box of a home system is 2,700 ��»-c+"" �°^»'h <br /> ai-coo w-.T" <br /> per hour(45 gpm)to prevent build-up of pressure in drop box. "/4'"F a I» a Imo°�°,• <br /> Pressure Distibution ft"""of►.1 <br /> 3.a. Select number of perforated laterals 3 <br /> Sonfftd <br /> b. Select perforation spacing= 3 feet. ` °'o,;". L.W <br /> C. Subtracj 2 ft.from the rock layer length. <br /> Vk feet. <br /> d. Determine the number of spaces between perforations. <br /> Length perf.spacing= ft.+ -1,_ft.= Z�spaces Required Perforation Discharge <br /> e. _Z,�spaces+1= A I perforations/lateral in gallons Per minute(gpm) <br /> f. Multiply perforations per lateral by number of laterals to 913a'� �d a �2� a P� °'d'PW <br /> get total number of perforations. ,,�- x �__2a perforations. (feet) <br /> g- 14 x 4> 4==gpm. <br /> 1.0a 0.74 <br /> SELECTED PUMP CAPACITY _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 /> 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.= D , (o ft•/100 ft of pipe <br /> b. Determine total pipe length from pump to dischargeElevation Difference) <br /> point. Add 25 percent to rite length for fitting ETPu'' <br /> P <br /> loss,or use a fitting loss chart. Equivalent pipe <br /> length-1.25 times pie length= F-18b <br /> )3 s x 1.25= /&;'� feet <br /> 1.5 inch 2.0 inch 3.0 inch <br /> c. Calculate total friction loss by multiplying SPm Friaim I=per 100 ft of pipe <br /> friction loss in ft/100 ft by equivalent pipe length. 10 0.69 0.20 <br /> Total friction loss= /(o9 x d • :, +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 /> + S' + 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 4?feet 45 14.73 3.28 0.48 <br /> 50 3.99 0.58 <br /> 55 4.76 0.70 <br /> G Pump selection 60 5.60 0.82 <br /> 1. A pump must be selected to deliver at least <br /> Z'� gpm (Step A)with at least )'/ feet of total head(Step B). <br />