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nwr SELEMQV PROCEDURE <br />A. Determine pump capacity- <br />Gravity Distribution <br />1. Minimum suggested is 600 gallons per hour (10 gpr,)) to stay ahead of <br />water use rate. <br />2. Maximum suggest for -delivery 10 a drop box of a home system is 2,700 <br />gallons per hot�5 gpm) to present build-up of pressure in drop box. <br />Pressure Distibution <br />3. a. Select number of perforated laterals <br />b. Select perforation spacing = feet- <br />C. Subtract 2 ft from the rock layer length. <br />�,�, 2 ft. = feet. <br />d. I�et__e the number of spaces between perforations. <br />Length perf. spacing = - ft. + ft. = spaces <br />e. _ spaces 1 = perforationsAatera! <br />f. Multiply perforations per lateral by number of laterals to <br />get total number of perforations. I,- x = perforations. <br />SELECTED PUiEP CAPACITY _y gpm 01 AL. <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, five feet for pressure <br />required at manifold if gravity system, zero. <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 />FA _= 2.al 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 />7 'L, x I.25 = ay J feet <br />c. Calculate total friction loss by multiplying <br />friction loss in ft/100 h by equivalent pipe length. <br />Total friction loss = --� � c) x ? '�' ✓ +100 = loe feet <br />4. Total head required is the sum of elevation difference, <br />special head requirements, and total friction loss. <br />l+ - + 4�1 <br />(1) (2) (30 <br />TOTAL HEAD D ?, feet <br />C. Pump selection <br />1. A pump must be selected to deliver at least <br />ti S gpm (Step A) with at least --:�_ feet of total head (Step B). <br />F-17 <br />ua PMORATlw a' • KRFORATtrD I=TCF&L <br />• lam, S.�r lM. � M f+„wr Frr, It/ v• <br />..r 77 <br />Requusd Perforabon D;, e <br />to gallons per ounute pm <br />lhscharge <br />Nead <br />(feet) <br />j= 0.6 "t <br />i .s 1w <br />1.0a <br />0.56 <br />0.74 <br />2.0b <br />0.80 <br />1.04 <br />a. Use for single family homes <br />b. Use for all other applications <br />Pipe Length <br />Point of Discharte <br />Elevation Diffemncc <br />Pump <br />F-18b <br />1.5 inch 2.0 inch 3.0 inch <br />gpm Fr.a m :m pv 100 h of <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 />2.6s <br />0.39 <br />45 <br />14.73 <br />3.28 <br />0.48 <br />5o <br />3.99 <br />0.58 <br />55 <br />4.76 <br />0.70 <br />60 <br />5.60 <br />0.82 <br />