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PUMP SELECTION PROCEDURE <br /> Perforation Discharges in gpm <br /> A. Determine pump capacity: perforation diameter <br /> gravity distribution head inches <br /> 1.Minimum required discharge is 10 gpm (feet) 1/8* 3/16 7/32 114 <br /> Z.Maximum suggested discharge is 45 gpm 1.0a 0.18 0.42 0.56 0.74 <br /> pressure distribution 2.0b 0.26 0.59 0.80 1.04 <br /> see pressure design worksheeet 5.0 0.41 1 0.94 1 1.26 1.65 <br /> Selected pump capacity: 5'0 gpm C Use j1.0 foot for single-family homes. <br /> b Use 2.0 feet for anything else. <br /> Potential for plugging <br /> B. Determine head requirements: <br /> 1.Elevation difference between pump and point of discharge. . � <br /> 10 feet <br /> 2.Special head requiremen-6 <br /> If pumping to a pressure distribution system,five feet for pressure <br /> required at manifold.If-c-ravity system,zero. S1 feet <br /> soil treatment <br /> 3.Friction loss system <br /> a.`Enteifriction loss table with m and pipe diameter. riteontaglIps <br /> SP P�P Read friction loss in feet mer 100 feet from table. Inlet etevaflo9 differenceF.L. _ x•99 .ft./100ft of pipe p4b.Determine total pipe length from pump to discharge -- -- ................. ....... <br /> point.Estimate by adding 25 percent to pipe length for fitting <br /> lose Equivalent pipe length times 1.25=total pipe length <br /> Z I x125= Ex-•zs feet <br /> c.Calculate total friction loss by multiplying friction loss Friction loss in Plastic Pipe <br /> in ft/100 ft by equivalent pipe length. Per 100 feet <br /> Total friction loss= z 6•a 5' x 3-99, + p <br /> 100= = feet nominal <br /> pipe diameter <br /> 4.Total head required is the sum of elevation difference,special head 9 <br /> flow rate 1.5" Y' <br /> requirements,and total emiction loss. 20 2.47 0.73 0.11 <br /> �0 + 5 + Z (1) (2) (3c) 2$ 3.73 1.11' 0.16 <br /> Total.head: i:' feet zo 4 �' 3011 5.23 1.55 0.23 <br /> 35 6.96 2.06 0.30 <br /> 40 &91 2.64 0.39 <br /> 45 11.07, 3.28 0.48 <br /> C. Pump selection V13.46 ��0.58 <br /> 55 4.76 '::0.70 <br /> I.A pump must be selected to deliver at least $� gpm 60 5.60 0.82 <br /> (Step A)with-at least Zo feet of total head (Step B). 65 6.48 0.95 <br /> 70 1 7.44 1.09 <br />