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a t a VON <br />; • a� �t <br />A. Detumine pump capacity. <br />Gravity Distribution <br />1. Minimum si,66ested is 600 gallons per hour (10 gpm) to stay ahead of <br />Water use rate. <br />L Maximum suggested for deli vcry to a drop box of a home system is 2,700 <br />gallons per hour (45 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 />e. Subtract 2 ft from the rock layer length. <br />2 ft = feet. <br />d. Determine the number of spaces between perforations. <br />Length peri. spacing = - it. 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 x= perforations. <br />g- _7.. x ,..� - - gpm. <br />SELECTED FUMY CAPACITY gpm <br />B. Detentnine head requirements: <br />1. Devation difference between pump and point of discharge. <br />feet <br />2. tf pumping to a pressure distribution system, five feet for pressure <br />31 required at manifold if gravity stem, zero. <br />_ S feet <br />3. Friction loss <br />a. Enter friction loss table with gpm and pipe diameter. <br />Read faction loss in feet per 100 feet from table. <br />F.L = D. (, ft/100 ft of pipe <br />b. Determine total pipe length from pump to discharge <br />pc; -L 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 />14 D x 1.25 = 1') :5" feet <br />c. Calculate total friction loss by multiplying <br />friction loss in ft/100 ft by equivalent pipe length. <br />Total friction loss - a. 1, _ x J 7 ,C +100 = S feet <br />4. Total head required is the sum of elevation difference, <br />special head requirements, and total friction loss. <br />(1) (2) (3c) <br />TOTAL BEAD lib_ feet <br />G Pump selection <br />1. A pump must be selected to deliver at least <br />gpm (Step A) with at least I I- feet of total head (Step B). <br />F-17 <br />LD KWORATDM OF • KRfORATED LATERAL <br />Lwr W Vw l� r iww.r K� W r• <br />� ti.• t w -Y ' �� W . td" <br />Mawr. utw w <br />U_ yM Lwr a.... r L.,w <br />.m t....r.. r.w. <br />t.... rent err LIw. <br />RequUW I'm hNs%onDnchirp <br />N PII"W PW M*Mmte (6Pa►► <br />e <br />f{aad <br />tit N rl <br />-0 t.0 <br />tt..t1 <br />12 <br />0.% <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 />Pipe LcngLh <br />Point of <br />EI: oraum Diftmwe <br />P 0 <br />F -18b <br />1.5 inch 2.0 inch 3.0 inch <br />IM h Ww= ro r. i W n of P. <br />10 <br />0.69 <br />0.20 <br />12 <br />0.% <br />0.28 <br />14 <br />1.28 <br />0.38 <br />16 <br />1.63 <br />0.48 <br />13 <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 />s0 <br />3.99 <br />0.58 <br />55 <br />4.76 <br />0.70 <br />60 <br />5.60 <br />0.82 <br />