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F-17 <br /> PUMP SELECTION PROCEDURE <br /> E}X) PERFORATION CF A PERFORATED LATERAL <br /> A. Determine pump capacity: Gr... <br /> Gravity Distribution „3` ' T,P.e,I '4a." <br /> 1. Minimum suggested is 600 gallons per hour(10 gpm)to stay ahead of • L�. a G7:41:we.k(w'av <br /> water use rate. • .."7"S.a Lqr Ie.I a,. .w..e...a <br /> 2. Maximum suggested for delivery to a drop box of a home system is 2,700 47,- ;....7,-..... P."..":"P."..":"C.".4"e.,.."'", <br /> MN GM Icer Teo <br /> gallons per hour(45 gpm)to prevent build-up of pressure in drop box. '.,.,,,s - LI L...I le Eaas <br /> Id el Rocs LOW <br /> Pvter"r/..LLL l d of <br /> Pressure Distibution «,Sand Lae.C� Lae. B."."'«L.'•.' <br /> 3.a. Select number of perforated laterals 3 <br /> v <br /> b. Select perforation spacing= 3 feet. -7 Oder.Sell Properly sca"Ia <br /> Before Plod,.,S.M Loy.r <br /> c. Subtr3ct 2 ft. from the rock layer length. <br /> Rock lam logy <br /> -2 ft.= (A,o feet. <br /> d. Determine the number of spaces between perforations. <br /> Length pert.spacing=SIL ft.+ 3 ft.= spaces Required Perforation Discharge <br /> e. �-A, spaces+ 1 = a,3 perforations/lateral in gallons per minute(gpn) <br /> f. Multiply perforations per lateral by number of laterals to ?/3a l.v,,44DischugHead amai., "F'1 eget total number of perforations. w� x �„ ,IQ.1= (eci perforations. (feet) <br /> X32 <br /> g. x _ <br /> =3` gpm. <br /> 1.0a CMED 0.74 <br /> SELEC i U.)PUMP CAPACITY 35 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 /> IS feet <br /> 2. If pumping to a pressure distribution system,five feet for pressure <br /> required at manifold if gravity system,zero. <br /> 5 feet <br /> 3. Friction loss <br /> a. Enter friction loss table with gpm and pipe diameter. Pipe Length i <br /> Read friction loss in feet per 1(X)feet from table. Point of Discharge <br /> F.L.= , la ft./100 ft of pipe - ,,ss <br /> b. Determine total pipe length from pump to discharge = --4 ' <br /> Elevation Difference <br /> point. Add 25 percent to pipe length for fitting Pump _7D <br /> loss,or use a fitting loss chart. Equivalent pipe <br /> length- 1.25 times pipe length= <br /> ) / O x1.25 = ) 3 ( feet F-18b <br /> c. Calculate total friction loss b multi 1 n 1.5 inch 2.0 inch 3.0 inch <br /> Y P Yi g grim Friction loss pa I OO R of pipe <br /> friction loss in ft/100 ft by equivalent pipe length. 10 0.69 0.20 <br /> Total friction loss= a r Le x 13 5S +100= L-1' feet 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 /> s + + 1-1 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 1-LEAD a 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 /> 3, gpm (Step A) with at least ay feet of total head (Step B). <br />