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• <br /> PUMP SELECTION PROCEDURE <br /> A. Determine pump capadty: <br /> Gravity Distribution <br /> 1. Minimum suggested is 20 gpm <br /> 2. Maximum suggested is 45 gpm Perforation Discharges in GPM <br /> Head Perforation diameter <br /> Pressure Distibution (feet) (inches) <br /> 3. a. Select number of perforated laterals 3 7/32 1/4 <br /> b. Select perforation spacing= Z. feet. 1.0a 036' . 0.74 <br /> c. Subtract 2 ft. from the rock layer length. 13 0.69 0.90 <br /> 2.0b 0.80 1.04 <br /> - -2 ft._ ,S-3 feet. <br /> • <br /> Writ b'C� a Use 1.0 foot single <br /> d. Determine the number of spaces between perforations. b Use 2.0 feet for single homes.thing else. <br /> Length pert.spacing=,Sl_ft.+ ft.=-L2-spaces <br /> e. 1') spaces +1 ....,1:__ perforations/lateral <br /> f. Multiply perforations per lateral bynumberof laterals to <br /> get total number of perforations. .t. x ;1'1_perforations. • <br /> g. O x =-�4-gpm. <br /> SELECI l;U PUMP CAPACITY L.1) gpm <br /> B.Determine head requiremenb: <br /> 1. Elevation difference between pump and point of discharge. <br /> `4 feet <br /> 2. If pumping to a pressure distribution system,five feet for pressure Soil°"°""" 'r <br /> required at manifold if gravity system,zero. =MN <br /> S feet pipe;a t% /0e <br /> 3. Friction loss <br /> a. Enter friction loss table with gpm and pipe diameter. »--- Veva don DiAesv+ca <br /> Read friction loss in feet per 100 feet from table(F-14). Pip' r <br /> • <br /> F.L. _ 2.i.`+ ft/100 ft of pipe v <br /> z <br /> b. Determine total pipe length from pump to discharge :........_. . <br /> point. Estimate by adding 25 percent to pipe length for fitting <br /> loss, or use a fitting loss chart(F-15 feet). <br /> Equivalent pipe len)th- 1.25 times pi a length= <br /> (O-a x 1.25= feet Friction Loss in Plastic Pipe <br /> c. Calculate total friction loss by multiplying Nominal <br /> friction loss in ft/100 ft by equivalent pipe length. pipe dial <br /> Total friction loss= ' , 1,,L-1 x <4 1 +100= - feet Flow Rate <br /> 4. Total head required is the sum of elevation difference, • gpm 1.5" 2" 3" <br /> special head requirements,and total friction loss. <br /> 20 2.47 0.73 0.11 <br /> + + 2 25 3.73 1.11 0.16 <br /> (1) (2) (3c) 30 5.2.3 1.55 0.23 <br /> 35 6.96 20& 0.30 <br /> TOTAL HEAD IS.; feet <br /> 8.91 0.39 <br /> .28 feet 45- 11.07 3 0.48 <br /> 50 13.46 3.99 038 <br /> 55 4.76 0.70 <br /> C. Pump selection 60 5.60 0.82 <br /> 65 6.48 0.95 <br /> • <br /> 70 7.44 1.09 <br /> 1. A pump must be selected to deliver at least <br /> Li D gpm (Step A) with at least --LC_feet of total heath (Step B). <br />