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� , University of Minnesota Pump Selection Procedure - 10/25/04 <br /> All boxed rectangfes must be entered,the rest witl be calculated. <br /> ows�Te <br /> 1. Detertnine pump capacity: T��;,�r <br /> A Gravity Distribution P� <br /> 1.Minimum required discharge is 10 gpm <br /> 2.Mapmum suggested discharge is 45 gpm <br /> For other establishments at least 10%greater tl�an the water <br /> suppty rate,but no faster than the rate at which effluent will flow <br /> out of tl�e distribution device. <br /> B. Pressure Distribution-see pressure design worksheet Sou t��t�,r 5v5r� <br /> &poiM of discharge <br /> 7k7('.4t:`.::1.::1. <br /> Selected Pump Capacity: 47 gpm forai�pe <br /> lengt <br /> 2A.elevatlon <br /> Inlet �• ` dlfierence <br /> 2. Determine Total Dynamic Nead(TDH) p�c�e ;; ; <br /> E� _ 1 <br /> A. Elew�on dilFerence betw�een pump and pant of discharge• ;!r....... .-- -- -- ; <br /> 15 feet « = --------------------------- ------ <br /> g. Sped�head requirement?(See F'►gur�-Special Head Requi�ments) <br /> �5 feet Special Head Requirements <br /> Gravity Distribution OPt <br /> C. Fric�ion bss in supply pipe Pressure Distributi� 5R <br /> 1. Sdect pipe di�neter �in <br /> 2. En6er Figure E-9 with gpm(1A or B)and pipe diameter(C1) <br /> Read fri�a�I�s in feet 100 feet from Figure E-9 E-9 Friction Loss in Pl�tic Pipe <br /> Frx�ion bss= 3.99 ft/100 ft of pipe 100 ft <br /> nomina� <br /> 3.De�mine total pipe length from pump discharge to sal system discharge point. Flow Rate �i e diameter <br /> Estimabe by adding 25 percent to pipe lengih for fiiction loss in fittings. 1.5' 20' 3" <br /> fimes 1.25=equivalent pipe length <br /> 120 ft x 1.25= 150 feet 25 3.73 1.11 0.16 <br /> ,�. , ;t �,f;. <br /> f;: <br /> 4.Ca�ulate total friction loss by multiplying friction loss(C2) 35 6.96 2.06 0.3 <br /> ^ �� F: <br /> by 1he equivalent pipe length(C3)and divide by 100. ' `�+�� j '. � _ � �, �.,;� `� , <br /> Fricbon Loss= 3.99 ft/100ft X 150 ft / 100= 6.0 feet 45 11.07 3.28 0.48 <br /> A: 7 M <br /> �'y'�� 5� � ���' <br /> D. Tot�head requirement is the sum of elevation difference(A),special 55 4.76 0.7 <br /> head r�uirements(B),and total friction loss(C4). 60 . 5$ 0;82 <br /> 15 ft + 5 ft + 6.0 ft 65 6.48 0.95 <br /> 70 7.44 l.09 <br /> Total Head: 26.0 feet <br /> 3. Pump Selection <br /> 1.A pump must be selected to deliver at least 47 gpm(1A or B) <br /> with at least 26.0 feet of total head(2D). <br /> I hereby certify that I have completed this work in accordance with all applicable ordinances,rules and laws. <br /> (signature) 810 (license#) (��� •�'���v-S (date) <br /> Page 1 of 1 <br />