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PUMP SELECTION PROCEDURE <br /> 1. Determine pump capacity: <br /> -...A. Gravity distribution <br /> 1. Minimum required discharge is 10 gpm <br /> 2. Maximum suggested discharge is 45 gpm. For other <br /> establishments at least 10%.greater than the water supply rate, <br /> but no faster than the rate at which effluent will flow out of the <br /> distribution device. <br /> B. Pressure distribution <br /> See pressure distribution work sheet <br /> From A or B. Selected'pump capacity: ygpm <br /> 2. Determine pump head requirements: <br /> A.Elevation difference between pump and point of discharge? soil treatment system <br /> 1 feet &p.Int of discharge <br /> B.Special head requirement?(See Figure at right-Special Head Requirements) total •Ipe <br /> leng <br /> S feet 2A.elevation <br /> inlet a,.;t>s::,,_;,; <br /> difference <br /> C. Calculate Friction loss • pipe <br /> 1. Select pipe diameter a.t0 in <br /> 2. Enter Figure E-9 with gpm(lA or B)and pipe diameter(C1). <br /> Read friction loss in feet per 100 feet from Figure E-9 Special Head Requirements <br /> Friction Loss= 3i-Cd ft/100ft of pipe Gravity Distribution 0 ft <br /> 3. Determine total pipe length from pump discharge to soil treatment Pressure Distribution 5 ft <br /> discharge point.Estimate by adding 25 percent to pipe length for <br /> fitting loss.Total pipe length times 1.25=equivalent pipe length E-9: Friction Loss in Plastic Pipe <br /> 0 feet x 1.25 = a.s0 • feet Per 100 feet <br /> 4. Calculate total friction loss by multiplying friction loss(C2) nominal <br /> in ft/100 ft.by.the equivalent pipe length(C3) and divide by 100. pipe dieter <br /> = 3• ft/100ft x aS) +100= )6 ft flow rote 1.5. <br /> 2am" 3" <br /> gpm <br /> D. Total head required isthe sum of elevation difference (A),special 20 2.47 0.73 0.11 <br /> head requirements.(B),and total friction loss (C4) 25 3.73 1.11 0.16 <br /> )"D.- ft+ ft+ 1i ft= 30 5.23 1.55 0.23 <br /> 35 6.96 2.06 0.30 <br /> Total head: a 0 feet 40 8.91 2.64 0.39 <br /> 3 45 11.07 3.28 0.48 <br /> . Pump selection <br /> 50 13.46 3.99 0.58 <br /> 55 4.76 0.70 <br /> A pump must be selected to deliver at least 4' gpm 60 5.60 0.82 <br /> (1A or B)with at least 7 feet of total head (2D) 65 6.48 0.95 <br /> 70 7.44 1.09 <br /> - I hereby certify that I hav ompleted this work in accordance with applicable ordinances, rules and laws. <br /> 66. (signature) (license#) -) -03 (date) <br />