The role of transport in logistics and freight movement of liquid fuels in Gauteng province
- Authors: Siluthanyi, Marubini Martin
- Date: 2017
- Subjects: Fuel - Transportation , Pipe - Fluid dynamics , Trucking , Freight and freightage
- Language: English
- Type: Masters (Thesis)
- Identifier: http://hdl.handle.net/10210/294945 , uj:32102
- Description: M.Tech. (Operations Management) , Abstract: The objective of this research was to investigate the role of transport in the logistics of liquid fuels in Gauteng province. The study provides a brief outline of the history of Gauteng and a short summary of its transport background. The study then examines the meaning of logistics and the product flow from manufacturer to end user. After discussing freight in general, the study then focuses on a sub-set of freight: liquid fuels in particular. Liquid fuels include all fuels transported via pipeline except gas. All role players were summarised and recommendations outlined. An investigation into academic literature summarised both published and unpublished documents. It reviews recent research into freight movement and logistics in general as well as the logistics and transport of liquid fuels. The research methodology used was a mixture of both qualitative and quantitative methodologies. There is a detailed examination of the entire field of liquid fuels distribution processes, how distribution centres operate and the capabilities of each. In particular, we discuss how liquid fuel distribution takes place in the Gauteng cities. The research findings form part of the information gathered using research questionnaires. The information gathered is analysed and the commented on at length. In summary, the entire research aimed to discover the role players in the movement of liquid fuel within Gauteng province, and the current operations and proposed optimised future routes.
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Ondersoek na dinamiese effekte in brandstofleidings
- Authors: Piek, Linda
- Date: 2014-02-13
- Subjects: Pipe - Fluid dynamics , Pipe - Design and construction
- Type: Thesis
- Identifier: uj:3961 , http://hdl.handle.net/10210/9320
- Description: M.Ing. (Mechanical Engineering) , Please refer to full text to view abstract
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A numerical investigation into the behaviour of cracks in uPVC pipes under pressure
- Authors: Cassa, Amanda Marilu
- Date: 2012-07-19
- Subjects: Pipe - Fluid dynamics , Numerical analysis , Piping , Finite element method
- Type: Thesis
- Identifier: uj:8843 , http://hdl.handle.net/10210/5255
- Description: D.Ing. , This study is a numerical investigation into the behaviour of cracks in uPVC pipes under pressure. This study is a continuation of a Masters dissertation which showed that leakage exponents vary significantly from the theoretical orifice exponent of 0.5 for cracks in pipes for different materials. This study looks at the behaviour of cracks in more detail and specifically with regard to the parameters of the pipe and crack. Using Finite Element Analysis the relationship between the pressure head and the leak area in pipes with longitudinal, spiral and circumferential cracks was investigated. It was found that the longitudinal, spiral and circumferential crack areas increase linearly with pressure. The slope of this linear relationship depends on various parameters, including loading state, pipe dimensions and pipe material properties. The effect that the individual pipe parameters had on the pressure-area slope was investigated. These parameters included the material properties of the pipe (Young’s modulus, Poisson’s ratio and longitudinal stress), the geometry of the pipe (internal diameter and wall thickness) as well as the geometry of the crack (length of the crack and the width of the crack). Once the effect of the pressure-area slope m is known, the link between the conventional leakage exponent N1 and the pressure-area slope m was further investigated and the effect of each parameter on the leakage exponent N1 was found. Using various data techniques the above data was combined and processed to find mathematical relationships that give reasonable descriptions of the pressure-area slopes of longitudinal, spiral and circumferential cracks. Once these equations for the pressure-area slopes were determined it was possible to obtain three new relationships for leakage from longitudinal, spiral and circumferential cracks.
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