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' PUMP SELECTION PROCEDURE <br /> END PERFORATION OF A PERFORATED LATER..L <br /> A. Determine pump capacity: celes Carer <br /> Gravity Distribution ;,a , 11` .; . <br /> 1. Minimum suggested is 600 gallons per hour(10 gpm)to stay ahead of - -. • - <br /> Laon,sow layer ••Leyer al 6aFobK(x.17 <br /> water use rate. Ywit%m ele.min ptoe l �>^re <br /> 2. Maximum suggested for delivery to a drop box of a home system is 2,700 ir,�rT r.71p r �i Hrl:.- tilted Naruomeu, <br /> Isle bap Nea Top <br /> gallons per hour(45 gpm)to prevent build-up of pressure in drop box. „a,,•�1e _ leSep• <br /> • lelel Rat ute, <br /> A <br /> PrfreU.,s located at <br /> Pressure Distibution _ cepa Seoe Lever lettere el Labral <br /> 3. a. Select number of perforated latgral ls - <br /> b. Select perforation spacing= 1j feet.3 <br /> Orlon Sell Pearriv Susilied <br /> Wlre Pisan/Sand Layer <br /> C. Sum raft 2 ft.from the rock layer length. <br /> Rock layerleaatk-2 ft._ feet. <br /> d. Determine the number of spaces between perforations. TABLE OF PERFORATION DISCHARGES IN Cl' <br /> Length perf.spacing=Sa ft.+ 3 ft.= spaces Head Perforation diameter(inches) <br /> e. iq- spaces+ 1 = I°l perforations/lateral <br /> t. Multiply perforations per lateral bY number of laterals4o 'SII '/. <br /> et total yy11mbcrr of perforations. ,,��t,,, x liIr„= S/ perforations. 1.0a 0.56 0.74 <br /> g. ,, x =-.-i$pm• 13 0.69 0.90 <br /> 2.0b 0.80 1.04 <br /> SELECTED PUMP CAPACITY 32 gpm 2.5 0.89 1.17 <br /> 3.0 0.98 1.28 <br /> 4.0 1.13 1.47 <br /> . B. Determine head requirements: 5.0 1.26 1.65 <br /> 1. Elevation difference between pump and point of discharge. <br /> aUse 1.0 foot of head for residential systems. <br /> 7 feet bUse 2.0 feet of head for other establishments <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 <br /> Read friction loss in feet per 100 feet from table. <br /> Point of Dischz. <br /> F.L. =7,e ft./100 ft of pipe <br /> b. Determine total pipe length from pump to discharge Elevation DiffcTcncc <br /> point. Add 25 percent to pipe length for fittingpip . <br /> loss,or use a fitting loss chart. Equivalent pipe <br /> length-1.25 times pipe length= F 18b <br /> 15- x 1.25= Z2 6 feet <br /> c. Calculate total friction loss bymultiplying1.5 inch 2.0 inch 3.0 inch <br /> Wm Friction loos per too rt of pipe <br /> friction loss in ft/100 ft by equivalent pipe length ` + 10 0.69 0.20 <br /> Total friction loss= '17 0 x I .0(--) +100= �• . 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 /> 7 + 5 + (4, `- 20 2.47 0.73 0.11 <br /> 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 /> TOTAL HEAD g7 feet 4011.072.64 0.39 <br /> 455 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 /> -•', gpm (Step A) with at least _feet of total head (Step B). <br />