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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 />- 2 ft. = ft. <br />d. Determine the number of spaces between perforations. <br />Length perf. spacing = ft. + ft. = spaces <br />e. spaces + 1 = perforations/lateral <br />f. Multiply perforations per lateral by number of laterals to <br />get total number of perforations. <br />x pcn. l_1= perforations. <br />g F; x sT -- gpm. <br />SELECTED PUMP CAPACITY _1-75- gpm <br />B. Determine head requirements: <br />1. Elevation difference betweengrnp 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. = 3.2 A 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 1 length = <br />_ x 1.25 = feet <br />c. Calculate total friction loss by multiplying <br />friction loss in ft/100 ft�y equivalent pipe length. <br />Total friction loss = I _S x 1220 _+100 = __3_ feet <br />4. Total head required is the sum of elevation difference, <br />special head requirements, and total friction loss. <br />�S + _57- + 3 <br />(11 (2) (30 <br />TOTAL HEAD 23 feet <br />C. Pump selection <br />1. A pump must be selected to deliver at least 4� gpm (Step A) <br />with at least Z3 feet of total head (Step B). <br />END PERFORATION OF A PERFORATED LATERAL <br />Cleo* Sad Low Mllrw <br />OrW"l Sell np-ly uWaled <br />afiw@ Plaiay Swld Layer <br />N Goolovile Fork for t-c- <br />pr M h" or w-c Iw-cc <br />Voem awe) <br />Walloon ost T" 1NriIMNlly <br />'IT <br />AI Lowl 12• l• Ed" <br />'• of %ct I.ayw <br />I Lawfed of <br />Lalwal <br />TABLE OF PERFORATION DISCHARCES IN CPM <br />Head Perforation diameter (inches) <br />/L <br />1 /a <br />1.0a <br />0.56 <br />0.74 <br />1.5 <br />0.69 <br />0.90 <br />2.Ob <br />0.80 <br />1.04 <br />25 <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 />5A <br />126 <br />1.65 <br />&Use'.0 root of had for residential systems. <br />bUse 2.0 feet of head for other establishments <br />Pipe Length <br />I ; <br />Point of TTDischarge <br />Elevation DiffcrenceEl <br />Pump <br />F-18b <br />13 inch 2.0 inch 3.0 inch <br />gig Frialoe for per too 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 />0.39 <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 />0S8 <br />55 <br />4.76 <br />0.70 <br />60 <br />5.60 <br />0.92 <br />