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F-17 <br /> PUNJT SELECTION PROCEDURE <br /> END PERFORATION OF A PERFORATED LATERAL <br /> A. Determine pump capacity. C_C_ <br /> Gravity Distribution <br /> 1. Minimum suggested is 600 gallons per hour(10 gpm/to stay ahead of - L,,,°,a c.-M O.FaiK Ia�. <br /> water use rate. '.LAr So*IA". "`"bm-.1w."'°-"'^° <br /> ,.. <br /> 2. Maximum suggested for delivery to a drop box of a home system is 2,700 °••�••.•w o.ao.�w,.n,�aa <br /> .H.c°°.... w <br /> gallons per hour(45 gpm)to prevent build-up of pressure in drop box. w ° <br /> `~ N <br /> Pressure Distibution cw°s.r UW `#.m <br /> ems..° I..N/°1 <br /> 3.a. Select number of perforated laterals 3 <br /> b. Select perforation spacing= _feet =°"t-'S"P swd-° <br /> C. Subtract 2 ft from the rock layer length. <br /> -2ft. feet <br /> d. Determine the number of spaces between perforations. <br /> Length perf.spacing=1,1._ft.+ 1'_ft.=Z?spaces Required Perforation Discharge <br /> e. i spaces+1= Z-'�, perforations/lateral in 8How Per nunute(wrn) <br /> f. Multiply perforations per lateral by number of laterals to <br /> get total number of perforations. x _ .M perforations. Uted <br /> g- -4 x�(2�==gpm. <br /> 1.Oa 0.56 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 /> K_feet <br /> 2. If pumping to a pressure distribution system,five feet for pressure <br /> required at manifold if gravity tem,zero. <br /> 1 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. ' <br /> F.L.= 7. 6 ft/100 ft of pipe Point of Dischwr&e <br /> Tiaa� <br /> b. Determine total pipe length from pump to discharge Zation Difference <br /> point Add 25 percent to pipe length for fitting P <br /> loss,or use a fitting loss chart. Equivalent pipe <br /> length-1.25 times pipe length= / F-18b <br /> /D O x 115= J,)1 feet 1.5 inch 2.0 inch 3.0 inch <br /> c. Calculate total friction loss by multiplying gm Fricum I u PW 100 ft of pipe <br /> friction loss in ft/100 ft by equivalent ipe length. <br /> Total friction loss= ).Ce x )a +100= Z _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) (30 30 5.23 1.55 0.23 <br /> 35 7.90 2.06 0.30 <br /> 40 11.07 2.64 0.39 I <br /> TOTAL HEAD 13 _feet 45 14.73 3.28 0.48 <br /> 50 3.99 0.58 <br /> C Pump selection 60 4.76 <br /> 60 0.62 <br /> 1. A pump must be selected to deliver at least <br /> `5 gpm (Step A)with at least _Q feet of total head(Step B). <br />