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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 su livery to a drop box of a home system is 2,70() <br />gallons per 45 ) t prevent build-up of pressure in drop box. <br />Pressure Distibution <br />3. a. Select number of perforated latents <br />b. Select perforation spacing = --- feet. <br />c. Subtract 2 ft. from the rock layer length. <br />Deiet <br />feet. <br />� <br />•Y <br />d. mute the number of spaces between perforations. <br />Length pert. spacing - _(t►•- -lt-�-- spaces <br />C. =spaces+ 1 =---perforations/lateral <br />I. Multiply perforations per lateral by number of laterals to <br />get total number of perforations.t.«�. x -= perforations. <br />g, . x',. _i a= gpm. <br />SELECTED PUMP CAPACM _'U_ gpm MAX. <br />B. Determine head requirements: <br />1. Elevation difference between pump and point of discharge. <br />I_ 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 />_ . 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. = I.Ik tr ft./100 It 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 -1.23 times pipe length = <br />V_ x 1.25 = /y C, feet <br />c. Calculate total friction loss by multiplying <br />friction loss in It/ 100 It by equivalent pipe length. <br />Total fnction loss = Z -'4Y Z -'4 x 10b, • 100 = I feet <br />4. Total head required is the sum of elevation difference. <br />special head requirements, and total friction loss. <br />(ll (2) (3c) <br />I <br />C. Pump selection <br />1. A pump must be selected to deliver at least <br />4 a gpm (Step A) with at least N feet of total head (Step t3). <br />MA+C- <br />F-17 <br />t. <br />r�......rrel.v <br />\." iw <br />k• ` -r ur r. tow <br />in vkwtn Ps aW.tw W-0 <br />tit <br />OP <br />0.69 <br />0.20 <br />(WO <br />0.96 <br />0.28 <br />1.0a <br />0.56 <br />0.74 <br />2.Ob <br />0.80 <br />1.04 <br />a. Use for single family homes <br />b. Use for all other applications <br />PIPC L_6Lh <br />PDiru of D <br />N 40 <br />Elevation Differerim <br />Pump 1171 <br />F -16b <br />1.5 arch 2.0 inch 3.0 inch <br />SM R=L w tN A IGD 1114 P" <br />to <br />0.69 <br />0.20 <br />12 <br />0.96 <br />0.28 <br />la <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 O. I i <br />25 <br />7.73 <br />1.11 00.16 <br />300 <br />5.23 <br />1-55 0.23 <br />11 <br />7-90 <br />2.06 0.30 <br />q <br />rI7 <br />.. o39 <br />V48 <br />3030 <br />310) 0.58 <br />35 <br />I <br />I 4.76 I 0.70 <br />10 <br />5AO 0.62 <br />