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PUMP SELECTION. 'ROCEDURE . <br /> 1. Determine pump capacity: 1. <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 wailer supply rate, <br /> but no faster than the rate at which effluent will flow out of the , <br /> distribution device. i <br /> • <br /> B. Pressure distribution <br /> See pressure distribution worksheet <br /> From A or B Selected pump capacity: 4r) gpm <br /> 1 <br /> 2. Determine pump head requirements: <br /> A. Elevation difference between pump and point of discharge? • sol treatment system <br /> 11 feet & .•i l • •!, age <br /> B.Special head requirement? (See Figure at right-Spec al Head Requirements) total •pe ' °' ,-•z- <br /> feet long 2A.elevation <br /> • inlet , difference <br /> C.Calculate Friction loss pipe <br /> • <br /> 1. Select pipe diameter a, in i ' • <br /> 5 eictsi <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 FigureiE-9 Special Head Requirements <br /> Friction Loss=• 3,4 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 tb pipe length fors <br /> fitting loss. Total pipe length times 1.25=equivalent pipe length • <br /> J30feet x 1.25 = I t.3 feet E-9:Friction Loss in Plastic Pipe <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 /> = 3.y ft/100ft x 1 1.3 +100= to ' ft flow rate 1.5" 2" 3" <br /> gpm <br /> ' D. Total head required is the sum of elevatipn difference(A),special ' 20 2.47 0.73 0.11 <br /> head requirements(B),and total friction loss.(C4) I 25 3.73 1.11 0.16 <br /> • 1 l • ft+ S ft+ . .''ft= 30 5.23 1.55 0.23 <br /> 35 6.96 2.06 0.30 <br /> Total head: aD. feet i ; 40 8:91 2.64 0.39 <br /> 3. Pump selection • <br /> 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') igpm 6055 <br /> 600 5.60 0.70 <br /> 60 0.82 <br /> (1A or B)with at least a._ feet of total head (21)) 65 6.48 0.95 <br /> I 70 7.44 1.09 , <br /> I hereby certify thatI have completed this work in accordance with applicable ordinances, rules and laws. <br /> 1 <br /> (signature) (license#) (date) <br />