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F-17 <br /> PUMP SELECTION PROCEDURE <br /> END PERFORATION OF A PERFORATED LATERAL <br /> A. Determine pump capacity: I I c...,C~ <br /> Gravity Distribution T.O.W <br /> 1. Minimum suggested is 600 gallons per hour 00 gpm)to stay ahead of ;:. N c»»nw Feria(d <br /> fw- <br /> water use rate. L•••r s•i.""' ;: <br /> 2. Maximum suggested for delivery to a drop box of a home system is 2,700 ►•».•�».Orii»0�.�� •, <br /> ie»car N_ Tw <br /> gallons per hour(45 gpm)to prevent build-up of pressure in drop box. ,,;„ a A«: 12' Ea.. <br /> Pressure Distibution cl�S."u.. 8.1l.lw F.t-0 L.1-1N 1-1.nl <br /> 3.a. Select number of perforated laterals 3 <br /> 9N.n►MCM Sees <br /> b. Select perforation spacing= �. S feet. oi,..er a.sell ►»wir Leser.r, <br /> C. Subtract 2 ft.from the rock layer length. <br /> -�-2 ft.= � ' , feet. <br /> d. Determine the number of spaces between perforations. <br /> Length perf.spacing= 1.:r ft.+a•,r ft.=I_spaces Required Perforation Dsch�se <br /> e. )o spaces+ 1= 1 ) perforations/lateral m patlow per minute(gpm) <br /> f. Multiply perforations per lateral by number of laterals to Mad 2 ad <br /> _get total number of perforations.TM x )P�,7>H..I=,,,$ perforations. (E� <br /> 1.0a 0.56 0.74 <br /> SELECTED PUMP CAPACITY 3 gpm 2.Ob 0.80 1.04 <br /> B.Determine head requirements: a.Use for single family homes <br /> 1. Elevation difference between pump and point of discharge. b.Use for all other applications <br /> _u_feet <br /> 2. If pumping to a pressure distribution system,five feet for pressure <br /> required at manifold if gravity system,zero. <br /> S feet <br /> 3. Friction loss <br /> a. Enter friction loss table with gpm and pipe diameter. Pipe Length <br /> Read friction loss in feet per 100 feet from table. Point of Discharge <br /> F.L.= a_�ft./100 ft of pipe <br /> b. Determine total pipe length from pump to discharge Elevation Diffcrcnccl <br /> point. Add 25 percent to pipe length for fitting Epump <br /> loss,or use a fitting loss chart. Equivalent pipe <br /> length-1.25 times pipe length= F-18b <br /> )a0 x 1.25= 1S0 feet <br /> c. Calculate total friction loss b multiplying1.5 inch 2.0 inch 3.0 inch <br /> Y gpm Fricua,tm pa loo n or Pia <br /> friction loss in ft/100 ft by equivalent pipe length. <br /> Total friction loss- a,c7 x O +100= 3 feet 10 0.69 0.20 <br /> - - 12 0.96 0.28 <br /> 4. Total head required is the sum of elevation difference, 14 1.28 0.38 <br /> special head requirements,and total friction loss. 16 1.63 0.48 <br /> 18 2.03 0.60 <br /> 20 2.47 0.73 0.11 <br /> + 1�r _+ 3 25 3.73 1.11 0.16 <br /> (1) (2) (3c) 30 5.23 1.55 0.23 <br /> 35 7.90 2.06 0.30 <br /> 40 11.07 2.64 0.39 <br /> TOTAL HEAD ) --7 feet 45 14.73 3.28 0.48 <br /> 50 3.99 0.58 <br /> C. Pump selection 60 5.60 0.82 <br /> 1. A pump must be selected to deliver at least <br /> gpm (Step A)with at least ,/9 feet of total head (Step B). <br />