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• <br /> 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 -Groes cage, <br /> water use rate. �- r ` <br /> Topsoil <br /> 2. Maximum suggested for delivery to a drop box of a home system is 2,700 4 `�Y--,- ---- -- <br /> gallons <br /> of Geolaelile Fabric for lou- <br /> gallons per hour(45 gpm) to prevent build-up of pressure in drop box. • Loamy Sand Layer // Inch lay.,al hay e,.how co.a.d <br /> t /, with red rosin pope.) <br /> er ur rp-Ie-,1171-Ti�1�, - _I'erlu allot,Grilled iionronlolly <br /> Pressure Distribution I;jj�il ` .1 Info C p Near Top <br /> 3 Plus \ kr- Al Least le In Edge <br /> 3. a. Select number of perforated laterals il!pr^in Fleld•Rock ._ .. .^t' of flock Layer <br /> b. Select perforation spacing= 3 ft. --Perforations Loculed at <br /> c. Subtract 2 ft. from the1rock layer length. Clean Sand Layer Bettors;of Lateral <br /> Roc4 layer lengrl,-2 ft._ LI 8 ft. -.a.- .Y • ‘-`7w P <br /> Iriginal Solt Properly Scarified <br /> Before Placing Sand Layer <br /> d. Determine the number of spaces between perforations. <br /> Length perf.spacing= 'Ig ft.+ 3 ft.= 14. spaces <br /> TABLE OF PERFORATION DISCI IARCrS IN CPM <br /> c. /(o spaces+ 1 = i 7 perforations/lateral <br /> ' f. Multiply perforations per lateral by number of laterals to I-lead Perforation diameter(inches) <br /> xttotal number of perforations. <br /> x t7 - .SI erforations. 7/3. t1'nl a Pere aleral r� --- <br /> i.Oa 0.56 <br /> /7� ;g 1.5 0.69 i.•Il <br /> & ' .. x Rpm/Vers=�-gpn'• 2.0b 0.80 1.04 <br /> 2.5 0.89 1.17 <br /> 3.0 0.98 1.28 <br /> SELECTED PUMP CAPACITY 38 gpm 4.0 1.13 1.47 <br /> 5.0 1.26 1.65 <br /> B.Determine head requirements: <br /> 1. Elevation difference between �laUse 1.0 foot of head for residential systems. <br /> mp and point of discharge. bUse 2.0 feet of head for other establishments <br /> p� 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 <br /> a. Enter friction loss table with gpm and pipe diameter. l Point of Discharge <br /> Read friction loss in feet per 1(X)feet from table. <br /> F.L. = 7,(..4 ft./1(X)ft of pipe Elevation Difference <br /> b. Determine total pipe length from pump to discharge Pump <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= <br /> 30 x 1.25= .3 1 feet 1.5 nch ins.0 inch 3.0 inch <br /> gpm 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= .37 x 2 .(04 +100. / feet 14 1.28 0.38 <br /> 4. Total head required is the sum of elevation difference, 16 1.63 0.48 <br /> special1head requirements,and total friction loss. 20 2.03 0.60 <br /> q 20 2.47 0.73 0.11 <br /> 7 <br /> 25 3.73 1.11 0.16 <br /> + -S + / <br /> 30 5.23 1.55 0.23 <br /> 7.90 .06 0.30 <br /> (1) (2) (3c) 4;1711.07 - .64 0.39 <br /> 14.73 0.48 <br /> TOTAL HEAD l3 feet 50 3.99 0.58 <br /> 55 4.76 0.70 <br /> 60 5.60 0.82 <br /> C. Pump selection <br /> 1. A pump must be selected to deliver at least 36 gpm (Step A) <br /> with at least // feet of total head (Step B). <br />