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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 /> • <br /> B. Pressure distribution <br /> See pressure distribution work sheet <br /> FromA or B Selected pump capacity: 40 gpm <br /> 2. Determine pump head requirements: <br /> A. Elevation difference between pump and point of discharge? • soil treatment system <br /> 1 S feet &paint of discharge <br /> Ogg . /0)') <br /> B. Special head requirement?(See Figure at right-Special Head Requirements) . total pipe <br /> • S feet len' <br /> ����W 2A.elevation <br /> Inlet ' difference <br /> C. Calculate Friction loss <br /> pipe ` <br /> 1. Select pipe diameter a.0 in <br /> r .200z <br /> 2. Enter Figure E-9 with gpm(lA or B)and pipe diameter(Cl). , <br /> Read friction loss in feet per 100 feet from Figure E-9 Special Head Requirements <br /> Friction Loss= a•e,9 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 /> feet x 1.25 = a b V feet <br /> 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 diameter <br /> • `-1 ft/100ft x ao +100= S ft flow rate 1.5" 2" 3" <br /> qpm <br /> D. Total head required is the 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 /> 1 S, ft+ s% ft+ ft= 30 5.23 1.55 0.23 <br /> Total head: �� feet 35 6.96 2.06 0.30 <br /> 40 8.91 0.39 <br /> 3. Pump selection 11.07 3.28 0.48 <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 0 qpm 60 5.60 0.82 <br /> (1A or B)with at least a feet of total head (2D) 65 6.48 0.95 <br /> 70 7.44 1.09 <br /> I hereby certify that I have completed this work in accordance with applicable ordinances, rules and laws. <br /> 5- • C- J 1 (signature) 39 4 (license#) `d -Y -a ) (date) <br />