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C <br />A. Determine Pump caPadhr <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 3 <br />b. Select perforation spacing = ­9_ ft. <br />c. Subt 2 fL from the rock layer length. <br />-2ft.= f.(. h. <br />d. Determine the number of spades between perforations. <br />Length perf. spacing ft. + ft. = 3 spaces <br />e. _1Z spaces + 1 =_ perforations/lateral <br />f. Multiply perforations per lateral by number of laterals to <br />get total number of perforations. <br />�3 x Q _ _�-7 perforations. <br />$ rl <br />x 1. gpm. <br />SELECTED PUMP CAPACITY _3f'! gpm <br />B. Determine head requirements: <br />1. Elevation difference between pump and point of discharge. <br />Z0 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 ppm and pipe diameter. <br />Read friction loss in feet per WO feet from table. <br />F.L. = a. 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 />aL i x 1.25 - l S 6 feet <br />c. Calculate total friction loss by multiplying <br />friction loss in ft/100 ft by equivalent pipe length. <br />Total friction loss = D .1. x ) S (� +100 = _ feet <br />4. Total head required is the sum of elevation difference, <br />special head requirements, and total friction loss. <br />Zv + <- + L_ <br />(1) (2) (30 <br />TOTAL HEAD ";L-fl- feet <br />C. Pump selection <br />1- A pump must be selected to deliver at least ,"/ gpra (Step A) <br />with at least '31,02_ feet of total head (Step B). <br />- D PCWWATION OF A PERFORATED LATERAL <br />feark IN rw- <br />won s ed <br />TABLE OF PERFORATION DWHARGES W CPM <br />Head Perforation diameter (Inches) <br />1 Aa <br />0.36 <br />0.74 <br />is <br />0.69 <br />M90 <br />2.0b <br />DAD <br />1.01 <br />23 <br />0.09 <br />1.17 <br />3.0 <br />0.96 <br />12S <br />4.0 <br />1.13 <br />1.47 <br />3A <br />1.26 <br />145 <br />aUse 1.0 foot of head for residential systems. <br />bUse 2.0 feet of bad for other astablWwwats <br />(ripe Length <br />Point of Discharge <br />I <br />/pfZElevation Difference <br />P"'np �9 <br />F-18b <br />1.5 inch 2.0 inch 3.0 inch <br />Sprn Fri tom ra 100 n of pips <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 />0.48 <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 />0.49 <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 />