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� <br /> University of Minnesota Pump �election Procedure - 10125J04 <br /> Ali boxed rectangles must be eniered,the rest will be calculated. <br /> �� • . <br /> c3��„-� <br /> 1. Determine um ca aci}��; ��w"`'� " ``"�� <br /> p P � `J �NCATMlNT --•- -' <br /> A. Gravity Distribution �"�'�"""' <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 /> suppiy rate,but no faster than the rate at which effluent wi{I fiow <br /> out of the distribution device. <br /> B. Pressure Distribution-see pressure design w�rksheet ' ' ` ' ` '�� <br /> �s.E _�,i__ r�� �._i :.��� <br /> , ,i.,;�,�,� /.,_ _ <br /> Selected Pump Capacity: 47 gpm ;,, �l <br /> ,��� � <br /> . �� Ji1.. "r.'.�- i�.f� <br /> Ill.'r;.�,_...._........ . . � C'��'E; .. `.:::... <br /> 2. Determine Totai Dynamic Head(TDH} "oc: <br /> A. Elevation difference between pump and point of tlischarge. ~'� ; <br /> ��feet �� �' � <br /> B. Speciai head requirement?(See Figure-Specia!Head Requirements) <br /> C�feet Speciai Head Requirements <br /> Gravity Distribution Oft <br /> C. Friction loss in supply pipe Pressure DistribuGon 5ft <br /> 1. Select pipe diameter Din <br /> ' 2. Enter Figure E-9 with gpm(1A or B}and pipe tliameter(C1) <br /> ' Read friction loss in ieet per 100 feet from Figure E-9 E-9 Friction Loss in Plastic Pipe <br /> Friciion loss= 3.99 ff/100 ft of pipe per 140 ft <br /> nominal <br /> 3. Determine tofal pipe length from pump discharge to soil system discharge point. Flow Rate ipe diametes � <br /> Estimate by adding 25 percent to pipe length for friction loss in fittings. m 1.5" 2.0" 3" <br /> Pipe len th times 1.25=equivalent pipe length 20 2.47 6.73 0.11 <br /> 27 ft x 1.25= 33.75 feet 25 :3.73 ".11 0 �6 <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= 3.99 ft/100ft X 33.75 ft 1 100= 1.3 feet 45 11.07 3.28 0.48 <br /> 5Q 13.46 3.99 Q53 <br /> ! D. Total head requirement is the sum of elevation difference(A),special 55 4.76 0.7 <br /> ihead requirements(B),and toial f�iction loss(C4). 60 5.6 0.82 <br /> ; 9 ft + 5 ft + 2.0 ft 65 6.48 0.95 <br /> � 70 7.44 1.09 <br /> Total Head: 16.0 feet <br /> I <br /> 3. Pump Selection <br /> 1.A pump must be selected to deliver at least 47 gpm(1A or B) <br /> �vifh at least 16.0 feet of total head(2D). <br /> I hereoy�ertify that 1 have completed this work in accordance with all applicable ordinances, rules and laws. <br /> . <br /> /�-.---J`��J' (signature) 810 (license#) 12/31l08 {Date} <br /> I Page 1 of 1 <br />