Laserfiche WebLink
University of Minnesota Pump Selection Procedure - 10/25/04 <br /> ' All�boxed rectangles must be entered,the rest will be calculated. <br /> oNsr,�e <br /> 1. Detenrdne pump capacity: T�TM� <br /> A. Gravity Distribution P�"'W <br /> 1.Minimum required discharge is 10 gpm <br /> 2.Ma�dmum suggested discharge is 45 gpm <br /> For other establishments at least 10°�6 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 wo�ksheet �ou f`�ar'^e"r Svs'�'' <br /> &pdnt of discharge <br /> Selected Pump Capacity: �gpm fotoi�pe <br /> length <br /> 2A.elevatlon <br /> inlet ` difference <br /> 2. Determine Total Dynamic Head(TDH) wpe�;;�m - '; <br /> , <br /> A. Elewation difference beri�een pump and pant of discharge. '�' ' <br /> OfeetI;:� __ _ ; -------------------------- ------ <br /> B. Special head requirement?(See F'�gure-Special Head Requirements) <br /> �5 feet Special Head Requi�ernents <br /> Gravity Distribution OPt <br /> C. Fric�a�loss in supply pipe Pressure Distribution 5ft <br /> 1. Seled pipe diameter �2 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 Pipe <br /> Friction bss= 3.28 ft/100 ft of pipe 100 R <br /> naninal <br /> 3.Determine total pipe length from pump discharge to soil system discharge point Flow Rate �i e diameter <br /> Estimate by�ding 25 perc;ent to pipe�ngth for fiction loss in fittings. m 1.5' 2.0' 3" <br /> � �,, <br /> Pi times 1.25=equivalent pipe length � �;� , L��= <br /> 315 ft x 1.25= 393.75 feet 25 3.73 1.11 016 <br /> ��` ��, . �� ��. <br /> 4.Calculate total friction loss by mul6plying friction loss(C2j 35 6.96 2.06 0.3 <br /> by the equivalent pipe length(C3)and divide by 1�. 4a $,.� . r�S4. 0:39 <br /> Fricbon Loss= 3.28 ft/100ft X 393.75 ft I 100= 12.9 feet 45 11.07 3.28 0.48 <br /> 50 13�46 ;3�9 �;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 S.8 '.0.82 <br /> 22 R + 5 ft + 13.0 ft 65 6.48 0.95 <br /> 70 7.44' 1.09 <br /> Total Head: 40.0 feet <br /> 3. Pump Selection <br /> 1.A pump must be selected to deliver at least 44 gpm(1A o�B) <br /> with at least 40.0 feet of total head(2D). <br /> I hereby certify that I have completed this wo�C in accordance with all applicable ordinances,rules and laws. <br /> (signature) 810 (�icense#) 3/�/0(� Date <br /> Page 1 of 1 <br />