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A. Determine pump capacity: <br />Gravity Distribution <br />1. Minimum suggested is 600 gallons per hour (10 gpm) to stay ahead of <br />water use rate. <br />2. Maximum suggested for delivery to a drop box of a home system is 2,700 <br />gallons per hour (45 gpm) to prevent build-up of pressure in drop box. <br />Pressure Distribution <br />3. a. Select number of perforated laterals <br />b. Select perforation spacing = ft. <br />c. Subtract 2 ft. from the rock layer length. <br />-2ft._ _ ft. <br />d. Determine the number of spaces between perforations. <br />Length pert. spacing r ft. + ft. = spaces <br />e. = spaces + 1 = perforations/lateral <br />f. Multiply perforations per lateral by number of laterals to <br />gM total number of perforations. <br />G=6 x ;j= L perforations. <br />g. ' x j;7.': -w - gpm. <br />SELECTED PUMP CAPACITY gpm <br />D. Determine head requirements: <br />1. Elevation difference between pump and point of discharge. <br />'� feet <br />2. If pumping to a pressure distribution system, add five feet for pressure <br />required at manifold <br />feet <br />3. Friction loss <br />a. Enter friction loss table with gpm and pipe diameter. <br />Read friction loss in feet per 100 feet from table. <br />F.L = ;) .(-. ft./100 ft of pipe <br />b. Determine total pipe length from pump to discharge <br />point. Add 25 percent to pipe length for fitting <br />loss, or use a fitting loss chart. Equivalent pipe <br />length -1.25 times pipe length = <br />C. x 1.25 = _'W I -feet <br />c. Calculate total friction loss by multiplying <br />friction loss in ft/100 ft by equivalent pipe length. <br />Total friction loss= x `! 1 +100 = feet <br />4. Total head re luired is the sum of elevation difference, <br />special head requirements, and total friction loss. <br />1. + ♦ 1 <br />(1) (2) (36 <br />TOTAL HEAD r ;- feet <br />C. Pump selection <br />1. A pump must be selected to deliver at least = gpm (Step A) <br />with at Icast �-7.- feet of total head (Step B). <br />END PERFORATION OF A PERFORATED LATERAL <br />TNra <br />10 <br />• � ! SW lMr •: ' � d aWs14mM FiMk for %W, <br />d N�e� <br />r..1 <br />y. <br />IMrIw bMM wNnn��ur <br />LNa rw %a <br />•i: n <br />u LMM u• a taN <br />M� <br />•1 raa L&M <br />• - <br />f+u/"Wft Lamw H <br />' CMM sow Lerw <br />1104wM M L4WV <br />=,1.,''w"M' <br />TABLE OF PERFORATION DISCHARGES IN GPM <br />Head Perforation diameter 0nchm) <br />10 <br />r/rr <br />y. <br />] be <br />0.56 <br />024 <br />1s <br />OA9 <br />M90 <br />2 -Ob <br />0A0 <br />1.01 <br />2s <br />ON <br />1.17 <br />3A <br />0.96 <br />128 <br />4.0 <br />1.13 <br />1.47 <br />SA <br />126 <br />145 <br />aUw 1.0 toot of head he residential sytlems. <br />bUm 2.0 feet of Mead for other asubHshtnsb <br />Pipe Length <br />Point of Discharge <br />1'1 <br />Eleation Dif%rttLcePump o) '7 . <br />F -18b <br />1.5 irv-h 2.0 inch 3.0 inch <br />81xn Fiiaiea Ler Pw tae R of pirm <br />10 <br />0.69 <br />0.20 <br />12 <br />0.96 <br />0.28 <br />14 <br />1.28 <br />0.38 <br />16 <br />1.63 <br />0.49 <br />18 <br />2.03 <br />0.60 <br />20 <br />2.47 <br />0.73 <br />0.11 <br />25 <br />3.73 <br />1.11 <br />0.16 <br />30 <br />5.23 <br />1.55 <br />0.23 <br />35 <br />7.90 <br />2.06 <br />0.30 <br />40 <br />11.07 <br />2.64 <br />0.39 <br />45 <br />14.73 <br />3.28 <br />0.48 <br />50 <br />3.99 <br />0.58 <br />55 <br />4.76 <br />0.70 <br />60 <br />5.60 <br />0.82 <br />