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PUMP SELECTION PROCEDURE <br /> A. Determine pump capacity: <br /> CGravity Distribution END PERFORATION OF A PERFORATED LATERAL <br /> 1. Minimum suggested is 600 gallons per hour(10 gpm)to stay ahead of Gras.Cover <br /> water use rate. ''" <br /> 2. Maximum suggested for delivery to a drop box of a home system is 2,700 . ... .. <br /> �yLayK of Cool*tile Fabric(or tor- <br /> gallons per hour(45 gpm)to prevent build-up of pressure in drop box. ..; Loamy sand Layer . loch layer of Iwy or draw corsred <br /> 4,''. :.. , with red rosin paper) <br /> ir..r(.7nggirn [l�.. P tortl n Date Horizontally <br /> Pressure Distribution of Top Near <br /> soma <br /> 3. a. Select number of perforated laterals 'i. phi. Al Leat Ir to Edge <br /> ro Field Roc .. 'r of Rock Layer <br /> b. Select perforation spacing= 3ft. - Perforations Located al <br /> c. Subtract 2 ft.from the rock layer length. ; clean Sand Layer Bottom of Lateral <br /> ltack�yserlengt�-2 ft.= G S ft. <br /> alWttal sell Property scarified <br /> Before Plodnq Sand Layer <br /> d. Determine the number of spaces between perforations. <br /> Length perf.spacing= -ft.+ -ft.= 17 spaces TABLE OF PERFORATION DISCHARGES IN GPM <br /> e. I P) spaces+ 1 = I perforations/lateral <br /> ' f. Multiply perforations per lateral by number of laterals to Head Perforation diameter(inches) <br /> get total number of perforations. <br /> Gal x7 erel= .5y perforations. ��" t�' <br /> 1.0a 0.56 0.74 <br /> 1.5 0.69 0.90 <br /> g. x __ l pm. 2.0b 0.80 1.04 <br /> 2.5 0.89 1.17 <br /> SELECTED PUMP CAPACITY D3.0 0.97 1.27 <br /> � gPm 4.0 ].]3 1.47. <br /> 5.0 1.26 1.65 <br /> B.Determine head requirements: <br /> 1. Elevation difference between pum andpoint of discharge. aUse 2.0.0 foot ofoheadadforfar otherestabl systems. <br /> r �j p g bUse feet head establishments <br /> feet <br /> 2. If pumping to a pressure distribution system,add five feet for pressure <br /> required at manifold <br /> S� feet <br /> 3. Friction loss Pipe Length t <br /> a. Enter friction loss table with gpm and pipe diameter. Point of Discharge <br /> Read friction loss in feet per 100 feet from table. 10ii <br /> F.L.= '•lo'! ft./100 ft of pipe Elevation Difference <br /> b. Determine total pipe length from pump to discharge Pump ciJ <br /> point. Add 25 percent to pipe length for fitting <br /> loss,or use a fitting loss chart. Equivalent pipe F-18b <br /> length-1.25 times pipe length= 1.5 inch 2.0 inch 3.0 inch <br /> (4,(..) x 1.25= ') feet gpm Friction lou per 100 ft of pipe <br /> c. Calculate total friction loss by multiplying 10 0.69 0.20 <br /> friction loss in ft/100 ft by equivalent pipe length. 12 0.96 0.28 <br /> Total friction loss= rl x o>.. '-j +.100= ' . feet 14 1.28 0.38 <br /> 4. Total head required is the sum of elevation difference, 16 1.63 0.48 <br /> �l 18 2.03 0.60 <br /> special head requirements,and total friction loss. 20 2.47 0.73 0.11 <br /> 25 3.73 1.11 0.16 <br /> + ,S.' + 30 5.23 1.55 0.23 <br /> 35 7.90 2.06 0.30 <br /> (1) (2) (3c) 40 11.07 2.64) 0.39 <br /> 3 14.73 3.2$ 0.48 <br /> TOTAL HEAD / to feet 50 3.99 0.58 <br /> 55 4.76 0.70 <br /> 60 5.60 0.82 <br /> 7 C. Pump selection <br /> 1. A pump must be selected to deliver at least 14 0 gpm (Step A) <br /> with at least /6 feet of total head (Step B). <br />