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PUMP SELECTION PROCEDURE <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. Subtr~ct 2 ft. from the rock layer length. <br />GCi!rj,~g1h -2 ft. = .!::L1. ft. <br />d. · Determine the number of spaces between perforations. <br />ENO PERfOOATION Of A PERFORATEt> LATERAL <br />.. ·, ~-; -, <br />:;, <br />~ Uotl 12'tt U.. =~~-,.,..,...._.,. ot AIM:k uyor <br />V .· c,-Sand Lo,.... <br />I?r.,~;·i~•~:;11~-+ <br />Length perf. spacing "".'.::12.. ft. + :;;__ ft. = -1.:L spaces <br />e. --1...::l_ spaces+ 1 = _J£ perforations/lateral <br />TABLF. OF PtmroRATION DISCHARGES IN CPM <br />f. Multiply perforations per lateral by number of laterals to <br />get total number of perforations. <br />r:;:;.1• x k.:ft-,.,.1= .!:.LL perforations. 1 / LJ · ~, r 1 .. P-:v~ <br />.!:J..,:;;.: ') rJ -, .. g. pen• X ;pmlp<i-1 = ~ gpm. <br />SELECTED PUMP CAPACITY~";.,_-.,_ gpm <br />B. Determine head requirements: <br />1. · Elevation difference between pump and point of discharge. <br />I t.~ feet <br />2. If pumping to a pressure distribution system, add five feet for pressure <br />required at manifold · ,,------"""-_feet <br />3. Friction loss <br />4. <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. ,.I 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 = (,. < x 1.25 = <'/ J feet <br />c. Calculate total friction loss by multiplying <br />friction loss in ft/100 ft by equivalent pipe length. <br />Total friction loss= I, '-/ x ·f·'. ) +.100 =--')-'"-_feet <br />Total head required is the sum of elevation difference, <br />special head requirements, and total friction loss. <br />/ i (-- <br />----+ --'--'--+ ,) <br />(1) (2) (3c) <br />TOTAL HEAD ·.) '··, feet <br />C. Pump seiection <br />1. A pump must be selected to deliver at least~ gpm (Step A) <br />with at least~ feet of total head (Step B). <br />Hend Perforation diameter (Inches) <br />'/ JJ 'I, <br />1.0a 0.56 0.74 <br />1.5 0.69 0.90 <br />2.0b 0.80 1.04 <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 />11URe 1.0 foot or head for t6ldentl11l systf!ml. <br />bUse 2.0 fttt or head for other establl,hmmls <br />Pipe Length <br />D ~---El-c-va-ti-on_D_~-;-:~-t-•~r~~'.'.•' <br />Pump 'l~ / <br />F-18b <br />1.5 inch 2,0 inch 3.0 inch <br />gpm Friction lou p..-100 n cl pipe <br />10 0.69 0.20 <br />12 0.96 0.28 <br />14 1.28 0.38 <br />16 1.63 0.48 <br />18 2.03 0.60 <br />20 2.47 0.73 0.11 <br />25 3.73 1.11 0.16 <br />30 5.23 1.55' 0.23 <br />35 7.90 2.06' 0.30 <br />40 11.o? 2.64 0.39 <br />45 14.73 3.28 0.48 <br />50 3.99 0.58 <br />55 4.76 0.70 <br />60 5.60 0.82