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F-17 <br /> PUMP SELECTION PROCEDURE <br /> ENO PERFORATION OF A PERFORATED LATERAL <br /> A. Determine pump capacity: ....,--Grans <br /> Gravity Distribution ' ' Too,,,, , <br /> 1. Minimum suggested is 600 gallons per hour(10 gpm)to stay ahead of _ IYGR)�f t„M.,w. ,k:o<t«._ <br /> water use rate. "rte 5aid ti,,, 'waf-y ;I, c�.d <br /> 2. Maximum suggested for delivery to a drop box of a home system is 2,700 Y; -T-■ �■a o..f.%:tK.067 =.n'.w <br /> .b N..r Too <br /> gallons per hour(45 gpm)to prevent build-up of pressure in drop box. ..,.Pl., ;_u Least 12 to <br /> •. FMfd . of Rocs Lara <br /> Perforations Located of <br /> Pressure Distibution cissa s,„„„L.rr Boman of Lateral <br /> 3.a. Select number of perforated laterals 3 <br /> / r <br /> b. Select perforation spacing= 3 feet. at..••t Solt Pr.a.ny Scarified <br /> Beare Plea.0 Sob Lam <br /> c. Subtract 2 ft.from the rock layer length. <br /> 2 <br /> ?- - ft._ (. Se feet. <br /> Reckyet lea.sgth <br /> d. Determine the number of spaces between perforations. <br /> Length perf.spacing=_(. ft.+ _ft.=3_spaces Required Perforation Discharge <br /> e. a a spaces+1="P'S perforations/lateral in gallons per minute(gpm) <br /> f. , Multiply perforations per lateral by number of laterals to Of. t/ Discharge ; <br /> Hget total number of perforations. L.L. x p„>,t�= C.* perforations. (feet) <br /> f) mth 3/4..6°`" <br /> g. Ifia x ,1=3`17 gpm. 1.Oa 0.56 0.74 <br /> SELEC I r.0 PUMP CAPACITY 37 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 /> 5/ feet <br /> 2. If pumping to a pressure distribution system,five feet for pressure <br /> required at manifold if gravity system,zero. <br /> ..T.- 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.= '. (. ft./100 ft of pipe T9y7 <br /> b. Determine total pipe length from pump to discharge Elevation Difference <br /> point. Add 25 percent to pipe length for fitting pump g3e7 <br /> loss,or use a fitting loss chart. Equivalent pipe <br /> length-1.25 times pipe length= <br /> 105 x 1.25= 1 2 feet F-18b <br /> c. Calculate total friction loss bymultiplying1.5 inch 2.0 inch 3.0 inch <br /> Pm Friction loss per 103 ft of pipe <br /> friction loss in ft/100 ft by equivalent pipe length. <br /> Total friction loss= 1 . x a .•kp +100= 3 feet 10 0.69 0.28 <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 /> + + 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 / L feet 45 14.73 3.28 0.48 <br /> 50 3.99 0.58 <br /> C. Pump selection 55 4.76 0.82 <br /> 1. A pump must be selected to deliver at least <br /> 3!7 gpm (Step A)with at least /L. feet of total head (Step B). <br />