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University of Minnesota Pump Selection Procedure - 10125/04 <br /> All boxed rectangles must be entered,the rest will be calculated. <br /> ONs�re <br /> 1. Determine um ca ac �°'"""'�` <br /> F P P hY' TRCATMQNT <br /> A. Gravity Distribution P"�"'"" �� � <br /> 1.Minimum required discharge 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 so�i treatmer:i system <br /> &pUint of dischorge <br /> ;sE:: <br /> Selected Pump Capacity: �gpm total pipe 't�� <br /> iengt <br /> iniet �`"""" '"""� 2A.etevatlon� <br /> 2. Determine Total namic Head DH �'�"�"�`"`�� �; difterence <br /> � � � Pipe pii) � <br /> fEf ._ ... . �: <br /> A. Elevation difference between pump and point of discharge. ,�,�.._.............. `� <br /> 12 feet fi' ��---------------------------- ------ <br /> ��R�.,,...n..,��, <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 P1pe <br /> Friction loss= 2.64 ft/100 ft of pipe er 100 ft <br /> nominal <br /> 3.Determine total pipe length from pump discharge to soil system discharge point. Flow Rate i e diameter <br /> Estimate by adding 25 percent to pipe fength for fiction loss in fittings. m 1.5" 2.0' 3' <br /> Pi len th times 1.25=equivalent pipe length 20 2.47 0.73 0.11 <br /> 130 ft x 1.25= 162.5 feet 25 3.73 1.11 0.16 <br /> 30 5.23 1.55 0.23 <br /> 4.Calculate total friction loss by multiplying friction loss(C2) 35 6.96 2.06 0.3 <br /> by the equivalent pipe length(C3)and divide by 100. 40 8.91 2.64 0.39 <br /> Friction Loss= 2.64 ft/100ft X 162.5 ft / 100= 4.3 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 difference(A),special 55 4.76 0.7 <br /> head requirements(B),and total fiction loss(C4). 60 5.6 0.82 <br /> 12 ft + 5 ft + 5.0 ft 65 6.48 0.95 <br /> 70 7.44 1.09 <br /> Total Head: 22.0 feet <br /> 3. Pump Selection <br /> 1.A pump must be selected to deliver at least 38 gpm(1A or B) <br /> with at least 22.0 feet of total head(2D. <br /> I hereby certify that I have completed this work in acxordance with all applicable ordinances,rules and laws. <br /> (signaiure) 810 (license#) 10/16/O6 (Date) <br /> Page 1 of 1 <br />