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University of Minnesota Pump Selection Procedure - 10I25/04 <br /> All boxed rectangles must be entered,the rest will be cakxilated. <br /> � <br /> ONS/TC <br /> 1. Determine um ca ac' sewA�e <br /> P P P �• TREATMEI�lr .-�~ _ <br /> A Gravity Distribution P"�a""`"' - ' =Z." <br /> 1.Minimum required disdiarge is 10 gpm <br /> 2.Maximum suggested discharge is 45 gpm <br /> For other establishments at least 10°�greater than the water <br /> supply rate,but no faster than the rate at which effluent will flow <br /> out of the distribution device. <br /> B. Pressure Distribution-see pressure design worksheet soil treatment system <br /> &pant of dischoige <br /> itiiii's <br /> �::::::::.......:::. <br /> Selected Pump Capacity: 58 gpm totoi�Pe <br /> iength <br /> inlef '�"�`"�"`:,..� �,� 2A.elevofion <br /> 2. Determine Total Dynamic Head(TDH) pipe ;; � <br /> difference <br /> - -- , _t: <br /> A. Elevation difference between pump and point of discharge. E: <br /> �;: __ _ . <br /> (;: --------------------------- ------ <br /> 17 feet ,:. .... LL��: <br /> B. Special head requirement?(See Figure-Special Head Requirements) <br /> �feet Special Head Requirements <br /> Gravity Distribution Oft <br /> C. Friction loss in supply pipe Pressure Distribution 5ft <br /> 1. Select pipe diameter �in <br /> 2. Enter Figure E-9 with gpm(1A or B)and pipe diameter(C1) <br /> Read friction loss in feet r 100 feet from Figure E-9 E-9 Friction Loss in Plastic Pipe <br /> Friction loss= 5.6 ff/100 ft of pipe per 100 ft <br /> nominal <br /> 3. Determine total pipe length from pump discharge to soil system discharge point. Flow Rate i diameter <br /> Estimate by adding 25 percent to pipe length for fiction loss in fittings. pm 1.5" 2.0" 3" <br /> Pipe len th times 125=equivalent pipe length 20 2.47 0.73 0.11 <br /> 112 ft x 1.25= 140 feet 25 3.73 1.11 0.16 <br /> 30 5.23 1.55 0.23 <br /> 4.Calculate total friction loss by multiplying fiction loss(C2) 35 6.96 2.06 Q.3 <br /> by the equivalent pipe length(C3)and divide by 100. 40 8.91 2.64 0.39 <br /> Friction Loss= 5.6 ff/100ft X 140 ft ! 100= 7.8 feet 45 11.07 3.28 0.48 <br /> 50 13.46 3.99 0.58 <br /> D. Total head requirement is the sum of elevation d'rfference(A),special 55 4.76 0.7 <br /> head requirements(B),and totai fiction loss(C4). 60 5.6 0.82 <br /> 17 ft + 5 ft + 8.0 ft 65 6.48 0.95 <br /> 70 7.44 1.09 <br /> Total Head: 30.0 feet <br /> 3. Pump Selection <br /> 1.A pump must be selected to deliver at least 58 gpm(1A or B) <br /> with at least 30.0 feet of total head(2D). <br /> I hereby certify that I have completed this work in acoordance with all applicable ordinances,rules and laws. <br /> (signature) 810 (license#) 6/29l08 (Date� <br /> Page 1 of 1 <br />