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University of Minnesota Pump Selection Procedure - 10/25104 <br /> All boxed rectangles must be entered,the rest will be calculated. � <br /> Oe�srre � <br /> 1. Determine pump capacity: T��� <br />� A Gravity Distribution P� <br /> 1.Minimum required disc�arge is 10 gpm <br /> 2.Ma�dmum suggested discharge is 45 gpm <br /> For other establist�ments at leas�10%greater than the water ; � <br /> supply rate,but no faster than the rate at whid�effluent will flow <br /> out of the distribution device. <br /> B. Pressure Distributlon-see pressure design wo�csheet &Ipan�1 o a sci;o 9e <br /> :,;<<����:�:�:,�; <br /> Selected Pump Capac'�ty: 29 gpm toroi�xPe <br /> length <br /> �.�T�. <br /> ,,,,,� 2A.elevatfon <br /> 2. Detertnine Total Dynamic Head(TDH) p;� �;� • difference <br /> !::........ .. . � <br /> A. Elevation d'rffe�ence between pump and point of discharge. 14' �� <br /> :.:.................. , <br /> 28 feet "� =--------------------•------. ..---- <br /> , <br /> B. Special head requirement?(See Figu�-Specia!Head Requirements) <br /> C�feet Special Fiead Requirements <br /> Gravity Distribution Oft <br /> C. Friction loss in supply pipe Pressure Distribution 5ft <br /> 1. Select pipe diameter �2 in <br /> 2. Enter Figure E-9 with gpm(1A or B)and pipe diamete�(C1) <br /> Read iricCtiion loss in feet 100 feet from Figure E-9 E-9 Friction Loas in Plastic Pipe <br /> ri <br /> Friction loss= 1.55 fl/100 ft of pipe 1 OO R <br /> nominal <br /> 3.Detemtine total pipe length from pump discha�ge to soil system discharge point. Flow Rate �i e diameter <br /> Estimate by adding 25 peroent to pipe length for fric6on loss in fittings. 1.5' 2.0" 3" <br /> Pi len times 1.25=equivalent pipe leng� � � �t'- <br /> 140 ft x 1.25= 175 feet 25 3.73 1.11 0.16 <br /> 3�:��.,<^,�..y <..xk � �7 ��;4.3�'' <br /> 4.Calculate total friction loss by mulbplying friction loss(C2) 35 u 6.96 2.06 0.3 <br /> ��'� ��� .0:39 <br /> by the equivalent pipe length(C3)and divide by 100. 4U; ;��,'�1,� � <br /> Fric6on Loss= 1.55 ff1100ft X 175 ft I 100= 2.7 feet 45 11.07 3.28 0.48 <br /> 50:+ �'�3�' ��� 0:58 <br /> D. Total head requirement is tl�e sum of elevatlon difference(A),special 55 4.76 0.7 <br /> head requirements(B),and total friction loss(C4). 60 , :��,� .';0.82 <br /> 28 ft + 5 ft + 3.0 ft 65 6.48 0.95 <br /> 70`: _ '�:+�4 '�1,09 <br /> Total Head: 36.0 feet <br /> 3. Pump Selection <br /> 1.A pump must be selected to deliver at least 29 gpm(1A or B) <br /> with at least 36.0 feet of total head(2D). <br /> I hereby cefify that I have completed this work in accordance with all applicable ordinances,�ules and laws. <br /> (signature) 810 (license#) 8115/2006 Date <br /> Page 1 of 1 <br />