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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: ,2c) gpm <br /> 2. Determine pump head requirements: <br /> A. Elevation difference between pump and point of discharge? soil treatment system <br /> feet <br /> &point of discharge <br /> orv�p <br /> B.Special head requirement? (See Figure at right-Special Head Requirements) total pipe <br /> length <br /> feet <br /> .,.a 2A.elevation <br /> inlet difference <br /> C.Calculate Friction loss pipe <br /> 1. Select pipe diameter oZ in <br /> 2. Enter Figure E-9 with gpm (1A 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 = /•SS' 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 /> j feet x1.25 = 7S' 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 /> = 1,55- ft/100ft x 7S� =100 = c,2 ft flow rate 1.5" 2" 3" <br /> gpm <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 /> ft+ ft+ of ft = 30 5.23 1.55 0.23 <br /> 35 6.96 2.06 0.30 <br /> Total head: /.5"-- feet <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 /> 55 4.76 0.82 <br /> A pump must be selected to deliver at least aS gpm <br /> 60 5.60 0.82 <br /> (1A or B) with at least /y feet of total head (2D) 65 6.48 0.95 <br /> 70 7.44 1.09 <br /> I hereby <br /> certify that I have completed this work in accordance with applicable ordinances, rules and laws. <br /> (signature) 510 _ -(license #) /O;/s s (date) <br />