Bmeia Hydram Pump Design


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Bmeia Hydram Pump Design

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Bmeia Hydram Pump Design

  1. 1. BMEIA HYDRAM PUMP DESIGNHydram Pump Part Volume CalculationDavid Effa and Dr. Abiy AwokeWCDE-00088-06Revision 100112David M. Effa works in the Waterloo Cases in Design Engineering Group (WCDE) in the Faculty of Engineering at the University of Waterloo. Heprepared this design case study for classroom use. The author does not intend to illustrate either effective or ineffective handling of an engineeringsituation. The author may have disguised certain names and other identifying information to protect confidentiality.The Waterloo Cases in Design Engineering Group prohibits any form of reproduction, storage or transmittal of this document without its writtenpermission. This material is not covered under authorization of CanCopy or any reproduction rights organization. To order copies or requestpermission to reproduce materials please contact the Waterloo Cases in Design Engineering Group c/o Department of Mechanical and MechatronicsEngineering, University of Waterloo, 200 University Avenue West, Waterloo, Ontario, Canada, N2L 3G1. Copyright © 2008-2009, David M. Effa.Used by the University of Waterloo with permission.IntroductionBasic Metal and Engineering Industries Agency (BMEIA) proposed to supply water for a small village(population of about 500 people) from a stream of water using a Hydram pump. The Hydram pumpcomponents must be designed according to the results generated from a site survey and an environmentalassessment. The Hydram pump has to pump water at 80 litres per minute to a height 5 times that of thedistance from the source to the pump [1]. The amount of water pumped to the required destination depends onthe quantity of water available from the source and a number of design factors including the volume of the airvessel, main body parts and other connections. Most of the Hydram pump parts are constructed from cast iron,as shown in Figure 1, in order to withstand vibration and cycling load during the pumping process. It isrequired to compute the inside volume of the pump parts and estimate the amount of cast iron needed forfabrication. These information will help to optimize the desired performance of the pump and help estimatematerial cost as well.Figure 1- Fabricated Hydram pump (Air vessel and Main body parts)
  2. 2. BMEIA Hydram Pump DesignWCDE-00088-06Air Vessel Volume CalculationThe air vessel is a vital component of the Hydram pump and is visually its main characteristic. Without it, thewater coming through the delivery valve would have a great velocity and too much head losses would becreated. With the air vessel, the water is slowed down because the air inside the air vessel acts like a spring.The volume of the air vessel, manufactured by BMEIA, ranges between 0.5 m3and 2 m3depending on thewater source and water requirements. The air vessel is axially symmetric about the vertical axis, as shown inFigure 2 (b). The top section is an elliptical sphere with a flange and the bottom section is a cylinder withamounted connecting parts. Figure 2 (a) and (b) shows a section view of the air vessel and the approximatedinside profile respectively. The basic design parameter used to determine the inside volume is shown in Figure2 (b) and detail dimension of the air vessel is given in Appendix A.The inside volume of air vessel needs to be estimated during the preliminary design stage since it determinesthe amount of water that can be pumped per unit time. BMEIA engineers used CAD software to compute thevolume and amount of material required as part of their design process. After developing the 3D model aMass Properties dialog box, similar to Appendix B, displays all geometric details of the given 3D model,including its volume. However, this method is a time consuming process since the designer needs to develop aCAD model to determine these parameters. In the following exercise calculate the volume of the air vesselshown in Fig. 2 using a triple integral in circular cylinder coordinates evaluated using MathCAD. Compareyour results with the value from the SolidWorks® model shown in Appendix B.esten(a) (b)Figure 2:- Hydram pump air vessel (a) section view (b) inverted air vessel inside profile and design parameters
  3. 3. BMEIA Hydram Pump DesignWCDE-00088-06References[1] David Effa and Dr. Abiy Awoke, “BMEIA Hydram Pump Design”, WCDE 00089-01, Waterloo Cases inDesign Engineering, April 2010[2] David Effa and Dr. Abiy Awoke, “BMEIA Hydram Pump Design”, WCDE 00089-02, Waterloo Cases inDesign Engineering, April 2010[3] Lorenz, H.: Theorie des hydraulischen Widders. Z. VDI Vol. 54 (1910) pp. 88/90.
  4. 4. 4WCDE-00088-06Appendix A - Air Vessel Detail Design
  5. 5. 5WCDE-00088-06 BMEIA HYDRAM WATER PUMP DESIGNAppendix B - SolidWork Air Vessel 3D model Mass Properties Dialog Box