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• <br /> PUMP SELECTION PROCEDURE <br /> A. Determine pump capacity: <br /> Gravity Distribution <br /> . 1. Minimum suggested is 20 gpm <br /> 2. Maximum suggested is 45 gpm Perforation Discharges in GPM <br /> Pressure Distibution Head Perforation diameter <br /> (feet) (inches) <br /> 3. a. Select number of perforated laterals 7/32 1/4 <br /> b. Select perforation spacing= feet. i.oa 0.56 0.74 <br /> c. Subtract 2 ft. from the rock layer length. 1.5 0.69 0.90 <br /> Rock layer length <br /> -2 ft.= feet. 2.0b 0.80 1.04 <br /> d. Determine the number of spaces between perforations. a Use 1.0 foot single homes. <br /> Length perf.spacing= ft.+ ft. = spaces b Use 2.0 feet for anything else. <br /> e. spaces + 1 = perforations/lateral <br /> f. Multiply perforations per lateral by number of laterals to <br /> • <br /> get total number of perforations. vis x p.r,sn.,rar= perforations. <br /> g. Ton. x rp�raa.=_____gpm. <br /> SELECTED PUMP CAPACITY -3 a gpm <br /> B. Determine head requirements: <br /> 1. Elevation difference between pump and point of discharge. <br /> s feet <br /> 2. If pumping to a pressure distribution system,five feet for pressure satl treatment system <br /> required at manifold if gravity item,zero. <br /> g feet Total pipe{mg.% 03. Friction loss � , <br /> a. Enter friction loss table with gpm and pipe diameter. a <br /> JO,po41 Read friction loss in feet per 100 feet from table(F-14). P'Pe 1 <br /> f-- F.L. = if y ft./l00 ft of pipe { <br /> ( b. Determine total pipe length from pump to discharge 1_ <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 length- 1.25 times pipe length= <br /> ?s x 1.25= `lY feet Friction Loss in Plastic Pipe <br /> c. Calculate total friction loss by multiplying P <br /> friction loss in ft/100 ft by equivalent pipe length. Nominal <br /> Total friction loss= 94 x /.SS +100= /' feet pipe dia. <br /> 4. Total head required is the sum of elevation difference, HOW Rate 1.5" 2" 3" <br /> special head requirements,and total friction loss. SPm <br /> + + •/ 20 2.47 0.73 0.11 <br /> 3.73 )..11 0.16 <br /> (1) (2) (3c) 5.23 1.55 ) 0.23 <br /> 35 6.96 -206' 0.30 <br /> TOTAL HEAD //' feet = /2 / 45 8.91 3.28 . 0.39 <br /> / 45 11.07 3.28 0.48 <br /> 50 13.46 3.99 0.58 <br /> C. Pump selection 55 4.76 0.70 <br /> 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 /> G gpm (Step A) with at least I Z.- feet of total head (Step B). <br /> i <br /> a <br />