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PUMP SELECTION PROCEDURE • <br />/ A. Determine,-. pump capacity: <br /> Gravity Distribution END PERFORATION OF A PERFORATED LATERAL <br /> 1. Minimum suggested is 600 gallons per hour(10 gpm)to stay ahead of opo..Caw <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. :•` ,:sup ow.ups, i•w tsr M kater.~• <br /> �. • . waft.. posts aeon) <br /> Ji <br /> Pressure Distribution rrt"•s'�r,Maa M",:O ," �► »l► <br /> 3. a. Select number of perforated laterals 3ttimv. a Wee <br /> • el Reek trier <br /> b. Select perforation spacing. 3 ft. :; ` r„ferefl,,,;taa.»r at <br /> c. Substract 2 ft.from the rock layer length. g`.. wise.'s...1..)... ft"...d L. <br /> 2 ft.• S ftc. • <br /> Reek I., 1� .+i_ . +..I., 4.+ - . ,w.4 :i;;L..,* <br /> f-&WIWI sea Property Seedbed <br /> d. Determine the number of spaces between �""Piecing Send tea., <br /> Pa perforations. <br /> Length pert.spacing In S_? ft.+_,3_ft.= I - spaces <br /> • e. I ') spaces+1 o c( perforations/lateral TABLE OF PERFORATION DISCHARGES IN CPM <br /> f. Multiply perforations per lateral by number of laterals to Head Perforation diameter(inches) <br /> get total number of perforations. <br /> pd.�� r t <br /> 1:-17-1 .. x `Asti ei iS V perforations. �� �� _ <br /> 1.Oa 036 0.74 <br /> g. 4 x.:241... = U D gpm. 1 s o 69 0.90 <br /> spa2.0b 0.80 1.04 <br /> • <br /> 23 0.89 1.17 <br /> 8SELEUI D PUMP CAPACITY 40 gpm 4.0 1.1 3.0 093 1,47 <br /> a 1.47 <br /> 5.0 1.26 1.65 <br /> B.Determine head requirements: <br /> 1. Elevation difference between pump andpoint of discharge. aUse i.e foot of head for residential systems. <br /> 1 j p head 2.0 feet of ld for other establishment <br /> [ feet 1 <br /> 2. If pumping to a pressure distribution system,add five feet for pressure <br /> required at manifold ! <br /> feet <br /> 3. Friction lossPipe Length <br /> 1 r <br /> a. Enter friction loss table with gpm and pipe diameter. Point of Discharge <br /> Read friction loss in feet per 100 feet from table. le a, <br /> F.L.at a.(.y ft./100 ft of pipe Elevation Difference <br /> b. Determine total pipe length from pump to discharge Pump (6 <br /> point. Add 25 percent to pipe length for fitting <br /> loss,or use a fitting loss chart. Equivalent pipe F-18h <br /> length-1.25 times pipe length= . <br /> 400 x 1.25= I a .<- feet gpm 1.5 rio,Ices2A inch 3.0 inch <br /> per 100 n or pipe <br /> c. Calculate total friction loss by multiplying <br /> friction loss in ft/100 ft by equivalent pipe length. • 10 0.96 0.28 <br /> Total friction loss se ..L.H x I +100= 3 feet • 14 1.28 0.38 <br /> 4. Total head required is the sum of elevation difference, 16 1.63 0.48 <br /> special head requi1•ements,and total friction loss. 20 2.03 0.60 <br /> 20 2.47 0.73 0.11 <br /> 25 3.73 1.11 0.16 <br /> '-4 + S' + 3 30 5.23 1.55 0.23 I <br /> ( ) (2) (3c) 35 7.90 2.06 0.30 <br /> 40 11.07 2.64 0.39 <br /> 45 14.73 3.28 0.48 <br /> TOTAL HEAD feet 50 3.99 038 <br /> 55 4.76 • 0.70 <br /> 60 5.60 0.82 <br /> C. Pump selection <br /> 1. A pump must be selected to deliver at least Ll 3 gpm (Step A) <br /> with at least a D feet of total head (Step B). <br />