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P MP ELE TION PROCEDURE <br />A. Determine pump capacity: <br />Gravity Distribution <br />1. Minimum suggested is 600 gallons per hour 00 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. Subt a �2 ft. from the rock layer length. <br />Kmaye, ngt - 2 ft. _ . ft. <br />d. Determine the number of spaces between perforations. <br />Length perf. spacing = _ ft. + _3_ ft. = spaces <br />c. /P...- spaces + 1 = _ perforations/lateral <br />f. Multiply perforations per lateral by number of laterals to <br />get total nu ber of perforations. <br />al]s x Pc s eleral= -• Perforations. <br />g. x gp` mTPkf = gpm. <br />SELECTED PUMP CAPACITY 42-eV gpm <br />B. 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. _fit ,31 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 />x 1.25 = _ �` feet <br />c. Calculate total friction loss by multiplying <br />friction loss in ft/100 ft by equivalcnpipe length. <br />Total friction loss = - x � � -100 = e r feet <br />4. Total head required is the sum of elevation difference, <br />special head requirements, and total friction loss. <br />+ �.• <br />(�) (2) (30 <br />TOTAL HEAD-E-- feet <br />- Pump selection <br />I. A pump must be selected to deliver at least 6 gpm (Step A) <br />with at least )`feet of total head (Step B). <br />END PERFORATION OF A PERFORATED LATERAL <br />�Glau COVer <br />Topsoil <br />Layer of Geolglile Fabric for 1a - <br />• Leatny Sand Layer inch loser al hat or draw covered <br />with red roam pope,) <br />- <br />�Perlut lion Drilled 110nronially <br />1� Info C p Near Top <br />�t-3/i Plus • e `` �,-Al Least 12' to Edge <br />vQLojn Field Races; al )lack Layer <br />-Perlarallons Located of <br />Clean Sand Layer Bullonr of Lateral <br />f Soll Properly Scarified <br />Beenre Piocing Sand Layer <br />TABIX OF PERFORATION DISCI IARGFS IN GIJM <br />Mead Perforation diameter (inches) <br />I <br />1.0a <br />0.56 <br />0.74 <br />M <br />0.69 <br />0.90 <br />2.Ob <br />11M <br />1.04 <br />2.5 <br />0.89 <br />1.17 <br />3.0 <br />0.98 <br />1.28 <br />4.0 <br />1.13 <br />1.47 <br />5.0 <br />1.26 <br />1.65 <br />a Use 1.0 foot of head for residential systems. <br />bUse 2.0 feet of head for other establishments <br />Pipe Length <br />Point of Dischargc <br />Elevation Difference <br />P'MP <br />F-18b <br />1.5 inch 2.0 inch 3.0 inch <br />SPm Friction loss per 100 rt or 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 />0.48 <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 />