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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 Gran Cover <br /> water use rate. 7.;o, Topsoil ,., ��' <br /> 2. Maximum suggested for delivery to a drop box of a home system is 2,700 .....,• ..., . <br /> f:'Loyer of Geoleztile Park(a(as- <br /> gallons per hour(45 gpm)to prevent build-up of pressure in drop box. _ :`Loany Sand Layer` -.Inch taya o,hay a swan carved <br /> •;. ._.. with red rods paper) <br /> 1uoGFfmpurtC]oompi• Perlaotion frilled Horizontally <br /> Pressure Distribution J. ' • "la •p War Top <br /> 3. a. Select number of perforated laterals i!D Pio. �� .1 =lay':Edge <br /> o1n Mid Rode. ti-;� of <br /> b. Select perforation spacing= ft. ; <br /> • Perforations Located of <br /> c. Subtract 2 ft.from the rock layer length. z_. clan ye <br /> saw Lar Bottom of Lateral <br /> Rock layer tenet%-2 ft._ , -' ft. =`` - ,. .:.. . ..,. <br /> Original Soil Properly Scarified <br /> Before Placing Sand Layer <br /> d. Determine the number of spaces between perforations. <br /> Length perf.spacing= ' ft.+ ft.= ! ') spaces TABLE OF PERFORATION DISCHARGES IN CPM <br /> e. ?') spaces+ 1 = ) c< perforations/lateral <br /> f. Multiply perforations per lateral by number of laterals to Head Perforation diameter(inches) <br /> get total number of perforations. <br /> . x _ LI perforations. sin y. <br /> 1.Oa • 0.56 0.74 <br /> c,L! `) ,, _ 1 S 0.69 0.90 <br /> g. p-- -iix�, re,,= -10 gpm. 2.0b 0.80 1.04 <br /> 2S 0.89 1.17 <br /> SELECTED PUMP CAPACITY '--/ 03.0 1.130. 1.28 <br /> gpm 4.0 1.47 <br /> 5.0 1.26 1.65 <br /> B.Determine head requirements: <br /> 1Use 1.0 foot of head for residential systems. <br /> 1. Elevation difference betweenump and point of discharge. bUse 2.0 feet of head for other establishments <br /> t <br /> ____LI____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 <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. .�..�"i ;U).C2) <br /> F.L.= D..lp-1 ft./100 ft of pipe Elevation Difference <br /> b. Determine total pipe length from pump to discharge Pump f)ci, C <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 /> L -l. . x 1.25= C, feet gpm Friction las 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= -1,�L► x S C.. +100= i S 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 /> I + + ! 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 /> 45 14.73 3.28 0.48 <br /> TOTAL HEAD l ) 1 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 lI 0 gpm (Step A) <br /> with at least LI I feet of total head (Step B). <br />