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r F-17 <br /> 1 PUMP SELECTION PROCEDURE <br /> END PERFORATION OF A PERFORATED LATERAL <br /> A. Determine pump capacity: <br /> Gravity Distribution Tom" <br /> 1. Minimum suggested is 600 gallons per hour(10 gpm)to stay ahead of . o<c..N.,w FaMk(or <br /> water use rate. `"�►:"°`°"' '°' """"'.�"""'° <br /> ry,-!';,,XW.ouo..I <br /> 2. Maximum suggested for delivery to a drop box of a home system is 2,700 fpbg"'go OnfNe gon3on1.11V <br /> Into too War Teo <br /> gallons per hour(45 gpm)to prevent build-up of pressure in drop box. :,,;p„ . Le , le to Ed <br /> g* <br /> ww <br /> RWA Lofts <br /> _. wwaiar LsrnNA @I <br /> Pressure Distibution cw.n s"nd L"W a"'°""'"'"°' <br /> 3.a. Select number of perforated laterals 3 <br /> b. Select perforation spacing= n_feet. ask" S"d or 1N° <br /> C. Subtract 2 ft.from the rock layer length. <br /> raw -2 ft.=_ Le&-o feet <br /> ermine <br /> d. Detthe number of spaces between perforations. <br /> Length perf.spacing=(6(L ft.+__-AL_ft.=2 1 spaces Required Perforation Discharge <br /> e. ,'1.-L spaces+1= .'"1� perforations/lateral in Mons per minute Y <br /> f. Multiply perforations per lateral by_ number of laterals to 3� s` a 2''P�+ 34'"a <br /> get total number of perforations. ,- x3Q,,= o perforations. cfeeU <br /> g x Pd_�gpm. <br /> 1.0a 0.74 <br /> SELECTED PUMP CAPACITY `S gpm 2.Ob 0.80 1.04 <br /> B.Determine head requirements: a.Use for single family homes <br /> 1. Elevation difference between purpp and point of discharge. b.Use for all other applications <br /> IT feet <br /> 2. If pumping to a pressure distribution system,five feet for pressure <br /> required at manifold if gravity stem,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 Disch <br /> RL= �.(e ft./100 ft of pipe a)�e <br /> b. Determine total pipe length from pump to dischargeElevation Differenc110)0 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 /> /10 x1.25= u4 feet <br /> c. Calculate total friction lossmultiplying1.5 inch 2.0 inch ainch <br /> by gpm tri m PW 100 s of pipe <br /> friction loss in ft/100 ft by equivalent pipe length. <br /> x +100= u feet 10 0.69 0.20 <br /> Total friction loss= <br /> �- � --I-- '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 /> 00 (2) (30 30 5.23 1.55 0.23 <br /> 35 7.90 2.06 0.30 <br /> 40 11.07 -2,04-_ 0.39 <br /> TOTAL HEAD �_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 />