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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: y o gpm <br /> 2. Determine pump head requirements: <br /> A. Elevation difference between pump and point of discharge? soil treatment systen <br /> a,-Z feet &point of discharge <br /> day e��a. <br /> B.Special head requirement? (See Figure at right-Special Head Requirements) total pipe 9 9-2 <br /> S' feet length <br /> inlet 2A.elevation <br /> C. Calculate Friction losspipe difference <br /> z <br /> ------ <br /> 1. Select pipe diameter a in <br /> ---------------------------- 4- -4 <br /> 2. Enter Figure E-9 with gpm (1A 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.'-9 ft/100ft of pipe Gravity Distribution 0ft <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 <br /> )`dS feet x 1.25 = _feet Friction Loss in Plastic Pipe <br /> 4. Calculate total friction loss by multiplying friction loss (C2) Per 100 feet <br /> nominal <br /> in ft/100 ft by the equivalent pipe length (C3) and divide by 100. pipe diameter <br /> ft/l00ft x as +100= ('2 _ft flow rate 1.5" 2" 3" <br /> pm <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 /> a`3 ft+ S ft+ -ft= 30 5.23 1.55 0.23 <br /> Total head: _ L 0 feet 35 6.96 2.06 0.30 <br /> 40 8.91 2.64 0.39 <br /> 3. Pump selection 45 11.07 3.28 0.48 <br /> 50 13.46 3.99 0.58 <br /> A pump must be selected to deliver at least- 4 0 g 55 4.76 0.70pm 60 5.60 0.82 <br /> (lA or B)with at least '- O _feet of total head (2D) 65 6.48 0.95 <br /> 70 1 7.44 1.09 <br /> I hereby certify that I have completed this work in accordance with applicable ordinances, rules and laws. <br /> (signature) (license#) _t! ar:0 " (date) <br />