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Unive�sity of Minnesota Pump Selection Procedure - 10125104 • <br /> All boxed rectangles must be entered,the rest will be calculated. <br /> o«sire <br /> 1. Determine pump capacit�r: T�e,;;Ne„R <br /> A. Gravity Distribution P�eooRw�" - <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��treatrrent sys!e-� <br /> &p ;M of dischorge <br /> Selected Pump Capacity: 38 gpm totol p:pe fi <br /> ..���', �eng... <br /> 2A.e!evo'lon; <br /> irdet.i:����- • difference) <br /> 2. Determine Total Dynamic Hepad P DH)� 9 p�pe�,if . �, � <br /> �; <br /> A. Elevatian difference between um and int of dischar e. �,�� ; I <br /> 12 feet I:;.......�._:_.._w-��"•f'------�----�-----•------ -- <br /> g, Special head requirement?(See Figure-Special Head Requirements) <br /> �-�feet Special Head Requirements <br /> Gravity Distrib Oft <br /> C. Fricbon loss in supply pipe Pressure Distribution 5ft <br /> 1. Select pipe diameter �2 in <br /> 2. Enter Figure E-9 with gpm(1A o�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= 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 length for friction loss in fittings. 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 /> 30 523 1.55 ''0.23 <br /> 4.Calculate total fiction loss by multiplying ftic6on 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 ftl100ft 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 friction 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 compfeted this work in accordance with all applicable ordinances, ru►es and laws. <br /> (signature) 810 (license#) 10!16,'O6 (Date1 <br /> Page 1 of 1 <br />