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PIMP.SELECTION FT,flCEDURII <br /> A. Determine pump capacity: <br /> • <br /> Gravity Distribution END PERFORATION OF A PERFORATED LATERAL <br /> 1. Minimum suggested is 600 gallons per hour(10 gpm) to stay ahead of or...c.■« <br /> water use rate. iyo; <br /> 2. Maximum suggested for delivery to a drop box of a home system is 2,700 '*.A . `% 'A <br /> ti N ONIMtlN RMR he Iwo• <br /> gallons per hour(45 gpm)to prevent build-up of pressure in drop box. 'fi-' Lamar!dad lave. .'.',.,.. pima mewed <br /> urn• • •..Slreunsum■ M l.r.Ile etoro11.rhon.ar <br /> Pressure Distribution f' <br /> 3. a. Select number of perforated laterals <br /> ■j, • Al lava 1r N t«• <br /> o ld,,A <br /> N Wee Lara <br /> b. Select perforation spacing = '� ft. . <br /> ;:;'. .. :.... l Nrlmollem l.aH.d al <br /> c. Subtract 2 ft. from the rock layer length. =..' a *�Ur•r °"'""'"L"'"'' <br /> Rock ■ .r k,, }i-2 ft. = (et,, ft. • ti 1j"'''„yM <br /> Y M <br /> Od,l.&Piecing <br /> r►gwlr k.rUIW <br /> Wan PNc1 q sand`.r.r <br /> d. Determine the number of spaces between perforations. <br /> Length pert*.spacing= roe„ ft.+ ::), ft.... .a. spaces TABLE OF PERFORATION DISCHARGES INGPM <br /> e. 2 spaces+ I = :-a_; perforations/lateral <br /> ' f. Multiply perforations per lateral by number of laterals to Head PerforaHondiameter(nches) <br /> get total number of perforations. 1 <br /> x '' .. Cx> perforations. �" �' <br /> t.n ■ r..,-6/1.,,,,i <br /> 1.0a 0.56 0.74 <br /> (�,r. ,� a) " 1S 0.69 0.90 <br /> g r...r, x ra•T.r= _, 1 gpm. l3,). U,': ,'s ., • 2.Ob 0.80 1.04 <br /> 23 0.89 1.17 <br /> SELECTED PUMP CAPACITY "13.0 0.981.28 <br /> gpm 4.0 17.1133 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 heed for other establishments <br /> '1 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 /> I r <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 io i <br /> F.L._ .lnN ft./100 ft of pipe Elevation Difference <br /> b. Determine total pipe length from pump to discharge Purnp cil-} <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 /> '� ' x 1.25 = l 1-/ feet gpm Friction lou par 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= ) .(,, L I x ,-'1 i./ +100= ? 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 /> + '� + - 30 5.23 1.55 0.23 <br /> (1) (2) (3c) 35 7.90 2.06 0.30 <br /> 40 11.07 __ 2.64 0.39 <br /> 45 14.73 3.28 0.48 <br /> TOTAL HEAD ) `-) 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 7'7 gpm (Step A) <br /> with at least )LI feet of total head (Step B). <br />