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s F-17 <br /> l PUMP SELECTION PROCEDURE <br /> EM PERFORATM OF A PERFORATED LATERAL <br /> A. Determine pump capacity. c...C~ <br /> Gravity Distribution rwg <br /> 1. Minimum suggested is 600 gallons per hour(10 gpm)to stay ahead of Faerk - <br /> (.k <br /> water use rate. '.`'an's"°`""` .0%rod,.oih pop.)^"�"'° <br /> 2. Maximum suggested for delivery to a drop box of a home system is 2,700 Vorter•lloo&NOW"orsvm^�h' <br /> &ft CAW f.r T.0 <br /> gallons per hour(45 gpm)to prevent build-up of pressure in.drop box. �; OW le to Ed" <br /> .f Sea LOW <br /> I "CIO <br /> Pressure Distibution amen ser LOW <br /> 3.a. Select number of perforated laterals _ <br /> b. Select perforation spacing=.-_feet <br /> c. Subtr 2 ft.from the rock layer length. <br /> -ms' s t. <br /> -z-2 ft._•(A to fee <br /> d. Determutethe number of spaces between perforations. <br /> Length perf.spacing= (ot,, ft.+-'L�ft.=3?spaces Required pfix tion e <br /> e. D spaces+1=. _perforations/lateral in pno-PQ-ut�(aP�+ <br /> f. Multiply perforations per lateral by number of laterals to 7 a'f e Head :`a''' 34, <br /> get total umber of perforations. a; x- - _1�perfo�a�ons. (� <br /> g' x Pd=-4-gpnL <br /> 1.0a - 0.74 <br /> SELECTED PUMP CAPACPTY 3!� -gpm 2.Ob 0.80 1.04 <br /> B.Determine head requirements: <br /> 1. Elevation difference between m and int of discharge. a.Use for single family homes <br /> �P P� ''Se• 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 gravitysm <br /> te ,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 Dinh e <br /> F.L. .(.e ft./100 ft of pipe ►DI�� <br /> b. Determine total pipe length from pump to discharge ©evation Difference <br /> point. Add 25 percent to pipe length for fitting p io tz <br /> loss,or use a fitting loss chart. Equivalent pipe <br /> length-1.25 times pipe length- <br /> _'Z�:x 1.25=O_feet F-18b <br /> 13 inch 2.0 inch ainch <br /> c. Calculate total friction lossby multiplying gpm r,kdwi« pw toonOf pipe <br /> friction loss in h/100 ft by equivalent pipe length. 10 0.69 0.20 <br /> Total friction loss= .1, 1. x 9_+100- Z 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 /> +5_+ a 25 3.73 1.11 0.16 <br /> (1) (2) (30 30 5.23 135 0.23 <br /> 35 7.90 2.06 0.30 <br /> 40 11.07 2.64 0.39 <br /> TOTAL HEAD _I feet 45 14.73 3.28 0.48 <br /> 50 3.99 0.58 <br /> C. Pump selection 6o 5.60 0.82 <br /> 1. A pump must be selected to deliver at least <br /> -34)_gpm (Step A)with at least )Z feet of total head(Step B). <br />