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University of Minnesota Pump Selection Procedure - 10125104 <br /> All boxed rectangles must be entered,the rat wID be calculated. <br /> Om <br /> 1. Determine pump capacity: -arm <br /> A. Gravity Distribution <br /> 1.Minimum required discharge Is 10 gpm <br /> 2.Maximum suggested discharge Is 45 gpm <br /> For other tents at Wast 10%greater titan the water <br /> supply rate,but no fuer than the rate at which effluent vAT flow <br /> out of Be distrbution device. <br /> B. Pressure Distribution-see pressure design worksheet soil treatment system <br /> & t of discharge <br /> Selected Pump Capacity: Ogpm total pipe <br /> len <br /> 2A.elevation <br /> Inlet difference <br /> 2. Determine Total Dynamic Head(TDH) pipe <br /> A 'Elevation difference between pump and point of discharge. . <br /> 21fit - -- -- ---- ....... <br /> B. Special head requirement?(See Rgum-Special Head Requirements) <br /> ©fest Special Head Requirement <br /> Gravity Distribution Oft <br /> C. Friction las 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 las In feet per 100 feet from Figure E-9 E-9 Friction Loss In Plastic Pipe <br /> Friction las= U 1°100 ft of pipe per 100 ft <br /> nominal <br /> 3.DeWmdne fatal pipe length from pump discharge to soil system discharge point Flow Rate plpe diameter <br /> Estimate by adding 25 percent to pipe length for friction las in fittings. m 1.58 2A0 T <br /> Pipe length times 1.25=equivalent pipe length X20,;, 2.47 qj b 1 <br /> 1.19 ift x 1.25= 1.3875 feet 25 3.73 1.11 0.16 <br /> 4.Calculate total friction las by multiplying fiction loss(C2) a 35 6.96 2.06 0.3 <br /> by the equivalent pipe length(C3)and divide by 100. <br /> Friction Loss= 290 ft/100ft X 1.3875 ft / 100: 4.0 feet 45 11.07 3.28 0.48 <br /> 00 Vbi <br /> D. Total head requirement is the sum of elevation difference(A),special 55 4.76 0.7 <br /> head requirements(B),and total friction las(C4). S6 Qat' <br /> 21 ft + 0 ft + 4.0 ft 65 6.48 0.95 <br /> 70 ?4d foil <br /> Total Head: 25.0 feet <br /> 3. Pump Selection <br /> 1.A pump must be selected to deliver at least 25 gpm(1A or B) <br /> with at least 25.0 feet of total head 2D). <br /> I hereby cxertily that i have completed this work in accordance%0 all applicable ordinances,rules and laws. <br /> (signs re) 810 (license#) 6/23/07 (Date) <br /> Page 1 of 1 <br />