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PUMP SELECTION PROCEDURE <br /> A. Determine pump capacity: <br /> Gravity Distribution END PERFORATION OF A PERFORATED LATERAL <br /> 1. Minimum suggested is 600 gallons per hour(10 gpm)to stay ahead of Grass Cover <br /> water use rate. Ns..;,),, <br /> Topsoil ` -'5).\‘'." <br /> 2. Maximum suggested for delivery to a drop box of a home system is 2,700 .:. . - . <br /> `;layer of Geoteztile Fabric(or to - <br /> gallons per hour(45 gpm)to prevent build-up of pressure in drop box. Loamy Sand Layer -.inch layer of hay or snow covered <br /> .. with red rosin paper) <br /> mirlII[IAp. Pertoi-ction Uhd Horizontally <br /> Pressure Distribution '"'° ° Neaar Top <br /> 3. a. Select number ofperforated laterals 3 ''%Pius <br /> �_ ofAl Least le yew Edge <br /> ter ki Field Rock. of Rock Layer <br /> b. Select perforation spacing= ft. :.Perforation;Located al <br /> c. Subtract 2 ft.from the rock layer length. Bottomclean Sand Layer Bottom Lateral <br /> Road ngiu-2 ft._ .S""3 ft. <br /> Original Soil Properly scarified <br /> More Placing Sand Layer <br /> d. Determine the number of spaces between perforations. <br /> Length perf.spacing= ..5Z ft.4-__Zft.= 17 spaces TABLE OF PERFORATION DISCHARGES IN CPM <br /> e. 1') spaces+ 1 = i u perforations/lateral <br /> f. Multiply perforations per lateral by number of laterals to Head Perforation diameter(inches) <br /> get total number of perforations. 7/n 1/e <br /> -e x _ perforations. <br /> 1.Oa 0.56 0.74 <br /> sLI •71S 0.69 0.90 <br /> g. P x awT�=3(�gpm. 2.0b 0.80 1.04 <br /> 2.5 0.89 1.17 <br /> SELECTED PUMP CAPACITY I-) 3.0 0.981.28 <br /> gPm 4.0 11.1133 1.47 <br /> 5.0 1.26 1.65 <br /> B.Determine head requirements: aUse 1.0 foot of head for residential systems. <br /> 1. Elevation difference between pump and point of discharge. bUse 2.0 feet of head for other establishments <br /> 1-0 feet <br /> 2. If pumping to a pressure distribution system,add five feet for pressure <br /> required at manifold <br /> feet <br /> 3. Friction loss Pipe Length I <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. 1 atc,i)• <br /> F.L.= '.("LI ft./100 ft of pipe Elevation Difference <br /> b. Determine total pipe length from pump to discharge Pip 9 Li,) <br /> point. Add 25 percent to pipe length for fitting <br /> loss,or use a fitting loss chart. Equivalent pipe F-I8b <br /> length-1.25 times pipe length= 1.5 inch 2.0 inch 3.0 inch <br /> al .1--- x 1.25= . K I feet8en, Friction loss per ICOR 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= D •t#L-I x ) +.100= '7 feet 14 1.28 0.38 <br /> 4. Total head required is the sum of elevation difference, 16 1.63 0.48 <br /> 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 /> a o + 5" + '7 30 5.23 1.55 0.23 <br /> 35 7.90 2.06 0.30 <br /> (1) (2) (3c) <br /> 40 11.07 2.64 0.39 <br /> 45 14.73 3.28 0.48 <br /> TOTAL HEAD T . feet 50 3.99 0.58 <br /> 55 4.76 0.70 <br /> 60 5.60 0.82 <br /> C. Pump selection <br /> A. A pump must be selected to deliver at least i-10 gpm (Step A) <br /> with at least .".- a feet of total head (Step B). <br />