Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 24 for “"Pipe systems"”.
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The mechanical behaviour of polyethylene pipe systems
The design of polyethylene (PE) pipelines for applications in the gas, water and chemical process industries has been based on data mainly obtained from stress rupture testing pipes only. In practice, installations are composed of both extruded pipe and injection moulded fittings which are joined …
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Investigation of deterioration models for stormwater pipe systems
… structures, buried stormwater drainage pipes deteriorate and fail over time in terms of pipe collapses due to structural deterioration or pipe blockages due to hydraulic deterioration. The deterioration of service infrastructure was a concern in Australian in recent times, where …
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Modelling of disturbed flow regimes in aspirated pipe systems
Aspirated systems such as those used for smoke detection are characterised by the use of long (e.g. lOOw), small- ore (e.g. 2lmm) pipes with sampling holes (e.g. 2mm) drilled at regular intervals (e.g. 4m). A low-power aspirator (e.g. 2W) draws a continuous sample of air from each hole throughout …
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Robot design for leak detection in water-pipe systems
Leaks are major problem that occur in the water pipelines all around the world. Several reports indicate loss of around 20 to 30 percent of water in the distribution of water through water pipe systems. Such loss of water represents critical waste of valuable resources, especially in countries such …
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A measurement based study of the acoustics of pipe systems with flow
… modes which form in the chamber match the tailpipe resonant frequencies. The results are compared with predictions of a model based on describing function theory
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Design and optimization of an MHD energy harvester for intelligent pipe systems
In this thesis, an innovative Magnetohydrodynamic (MHD) energy harvester with the use of the magnetic concentrator is designed and optimized. A theoretical model relating the conductivity of water, magnetic flux density B, flow velocity u and the channel volume to the power output is first …
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Evaluation of Strength and Hydraulic Properties of Buried Pipe Systems Used for Stormwater Harvesting
… In this study, high-density polyethylene (HDPE) pipes used as an underground storage was evaluated and a Microsoft EXCEL based model was developed, called PIPE-R Model. To study the structural integrity of the pipes, laboratory and field testing were conducted. For the water harvesting, UCF …
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Design of soft-body robot with wireless communication for leak detection in large diameter pipe systems
… or low cost methods to detect leaks, a soft-body pipe leak detection robot has been developed to traverse small, 50mm diameter water pipe systems. This robot has proven to be effective in small diameter pipes, but its scalability for large diameter pipes is unknown. The focus of this thesis is to …
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The long-term behaviour of butt fusion welds in polyethylene pipeline systems
… was to determine the extent to which the pipe system's long-term strength under both internal fluctuating and constant pressure is reduced by the presence of axially misaligned butt welds. The second objective was to examine fracture initiation sites and crack propagation paths of the …
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Evaluation of Seven Septic Systems on Representative Soil Settings in Greene County, Missouri
On-site septic systems are utilized by approximately 30 percent of all housing in the state of Missouri. Properly functioning septic systems are essential in order to remove human waste before it can contaminate water supplies. Common types of septic systems currently used in Greene County, …
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Turbulent Flow Over Rough Surfaces
… geometry rough-walled surfaces in two size pipe systems as a function of the ratio of roughness height to spacing distance between the elements (P/K), the axial variation of the flow, and the flow rates. The variations in P/K geometries caused the flow structure to change from quasi-smooth …
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Overtrawlability and Mechanical Damage of Pipe-in-Pipe
Pipe-in-pipes are widely used in the offshore industry. Traditionally, mechanical design of these systems with regards to fishing gear interaction has used the same approach as for single pipe systems. However, this approach is likely to result in a conservative design as the outer pipe is not …
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A knowledge based system for irrigation planning in Virginia
… economic feasibility of a range of irrigation systems for site specific conditions. The KBS uses information input by the user to determine possible irrigation alternatives and provides an economic evaluation of suitable systems based on domain-specific knowledge about soils, crops, irrigation …
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Further studies of unsteady gas flow in the manifolds of multi-cylinder automobile engines
… into the general principles of unsteady flow in pipe systems, with analysis of specific flow regions in the manifolds of a carburetted, four-stroke, automotive engine. The unsteady flow calculation is effected by the method of characteristics under the assumption of one-dimensional, compressible …
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An Evaluation and Pressure-Driven Design of Potable Water Plumbing Systems
Potable water distribution systems are broken into major and minor distribution networks. Major water distribution networks refer to large-scale municipal pipe systems extending from the treatment plant to the upstream node of the water service line for buildings. Minor water distribution systems, …
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Beschleunigter Stoffaustrag aus Reaktordeponien
… use of existing gas wells as sink shafts or of pipe systems installed under the sealing and the installation of lances. The results first revealed that discharge of pollutants via the gas phase directly depends on the water quantity recycled. Examining the discharge of pollutants via the …
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Study of Durability of Epoxy Bonded Joints in Aqueous Environments
… a result of wear and tear of fluid transporting pipe systems. Consequently, it is sometimes necessary to shut down the entire operation to fix the problem. Thus, it is worth evaluating other methods that can repair the damage for a temporary period without shutting down the operation while a new …
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Development of a Performance Index for Stormwater Pipe Infrastructure using Fuzzy Inference Method
Stormwater pipe infrastructure collects and conveys surface runoff resulting from rainfall or snowmelt to nearby streams. Traditionally, stormwater pipe systems were integrated with wastewater infrastructure through a combined sewer system. Many of these systems are being separated due to the …
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Struktur-Wirkungsbeziehungen bei der Verminderung der Wandreibung in Strömungssystemen durch supramolekulare Strukturen
Flowing liquids in pipe systems cause pressure drops and energy losses and can be responsible for the initiation of flow induced localized corrosion (FILC). Initiation of FILC is affected by unfavourable geometric conditions in flow systems and local flow intensities above critical values. Many …
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Joint identification in structural waveguides using wave reflection and transmission coefficients
… to many engineering applications, such as pipe systems and beam networks in constructions. Currently available techniques are undermined by inadequate ability to model the joints and other discontinuities due to uncertainty in their properties. Measured modal data can be used to update …
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