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PUMP SELECTION PROCEDURI; <br />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. k,c,r.1.>,-lo"9l' -- <br />d. Determine the number of spaces between perforations. <br />Length perf. spacing=_._ ft. <br />1 <br />+ __ ft. = __ spaces <br />e. ___ spaces+ 1 = __ perf~rations/1atera1 <br />• f. Multiply perforations per lateral by number of laterals to <br />get total number of perforations. =-• x ,-,,.1t.....il= __ perforations. <br />g. -;;;: X gpmlpcif = __ gpm. <br />SELECTED PUMP CAP AOTY 47 gpm <br />B. Determine head requirements: <br />· 1. Elevation difference between pump and point of discharge. -ro feet <br />2. If pumping to a pressure distribution system, add five feet for pressure <br />~uired at manifold <br />__ ~ __ feet <br />3. Friction loss <br />a. Enter friction loss table with gpm and pipe diameter. <br />ENO PERFORATION OF A PERF0RATED LATEJ'!At. <br />:;-;_<:"-:f.:: ~::; : : -.·-.... <br />t,,,·•. <br />~;]-. Cl..,..s..nd i.a.,.., :: ... ·. ·. 'S?::.~;·~,: ~.:;;··~~~ :;. <br />Belen Plodnq Send l..,... <br />/1.l lllOd ~ le Edqa .. ,_lAyw <br />TABLE OF PERFORATION DISCHARGES IN GPM ! <br />Head Perforation diameter~) <br />'I,. 'I. <br />1.0a 0.56 0.74 <br />l.S 0.69 0.90 <br />2.0b 0.80 1.D4 <br />2.5 0.89 1.17 <br />3.0 0.98 1.28 <br />4.0 1.13 1.47 <br />5.0 1.26 1.65 <br />a Use 1.0 foot o{ head for residential systems. <br />bUse 2.0 feet or head for other establishments <br />Pipe Length <br />Point of Discharge <br />Read friction loss in feet per 100 feet from table. · <br />F.L = 21 &::? 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 />n ----El-e-va_ti_on_D_i_ffi_.e-1e:-= I . <br />~Pump <br />loss, or use a fitting.loss chart .. Equivalent pipe· <br />-----Iength-1.25 tiT.f!ipe ~e~~== lS~.-. · f~·· -·· <br />c. Calculate total friction loss by multiplying <br />friction loss in ft/100 ft by equivalent pipe length.-/'-~ <br />Total friction loss=-I¼ x 5,v +100 = · ~ feet' <br />4. Total head required is the sum of elevation difference, <br />special head requirements, and total friction loss. <br />-~✓~b ___ + __ 5 ____ + ___ ~-- <br />(l) (2) (3d <br />TOTAL HEAD -Z/ feet <br />C. Pump selection · <br />1. A pump must be selected to deliver at least 4-:Z gpm (Step A) <br />with at least 2/. feet of total head -(Step B). <br />gpm <br />10 <br />12 <br />14 · <br />16 <br />18 <br />20 <br />25 <br />30 <br />35 <br />40 <br />45 <br />50- <br />55 <br />60 <br />F-18b <br />1.5 inch · 2.0inch 3.0 inch <br />Fmllal 1.-per 100 tt oL pipe <br />0.69 .. 0.20 <br />0.96 0..28 <br />1.28 0.38 <br />1.63 0.48 . <br />2.03 0.60 <br />2.47 0.73 0.11 <br />3.73 1.11 0.16 <br />5.23 1.55 0.23 <br />7.90 2.06 0.30 <br />11.07 t~ . 0.39 <br />14.73 : 0.48 <br />t--1.99 ' 0.58' <br />4.16 . 0.10 <br />5.60 0.82