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 19 of 19 for “"pipeline systems"”.
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Condition assessment of polyethylene pipeline systems
… the condition assessment programme of PE pipelines systems. The primary goal of this study was to establish a better understanding of the ageing process in commercial piping materials and to understand its effect on long term integrity of PE pipeline systems. Eltex, Rigidex and Aldyl A are …
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Advanced Quantitative Risk Assessment of Offshore Gas Pipeline Systems
… of organising information of the real world systems, to represent the Offshore Gas Supply Systems (OGSSs) at both the component and system levels. Then based on the object-oriented approach, frameworks of aggregative risk assessment and fault tree analysis are developed. Aggregative risk …
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The dynamic behaviour of check valves in pipeline systems
… the dynamic behaviour of check valves in pipeline systems. The method is based on parameterized valve models and dimensionless valve characteristics, which may be obtained from experiments. The check valve is considered as a black box with certain input and output characteristics. The …
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Dual-Interval Optimization Modeling for the Planning of Natural Gas Pipeline Systems
Natural gas (NG) pipeline network, a major mode of transportation, requires optimized operations and management in order to ensure stable and efficient gas supplies. To provide such optimal solutions, pipeline systems modeling is a widely used method. The interactions among upstream, midstream, and …
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The long-term behaviour of butt fusion welds in polyethylene pipeline systems
… butt fusion weld in 63,90 and 125mm MDPE pipe systems at 79°C in a water environment. In the butt fusion weld having axial misalignment of 20 per cent of the wall thickness and above, the reduction in the fatigue and stress-rupture lifetime was greater than 50 per cent compared to the aligned …
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The delay composition theorem on pipeline systems with non-preemptive priority varying scheduling algorithms
… theorem, by taking into account the fact that pipeline systems allow concurrent execution, expresses the upper-bounded delay of a real-time task as the sum of two summations, where the first one is linear to the number of stages of the system, and the second one is linear to the number of tasks …
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Renewal Engineering Technologies for Drinking Water and Wastewater Pipeline Systems - A State of the Art Literature and Practice Review
… and environment, and allow for expedited pipeline renewals compared to traditional open trench methods. The challenge now is in getting utilities to implement new innovative technologies within their system. This thesis provides background information on a number of the technologies …
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Transitional and turbulent flow of non-Newtonian slurries in pipes
The only reliable approach open to designers of pipeline systems conveying non-Newtonian slurries in the turbulent flow regime has been large scale-pipe-tests. This thesis addresses this design problem, with particular emphasis on the theoretical modelling of the laminar/turbulent transition and …
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Pipe-Soil Interaction on a Clay Seabed
Subsea pipelines form an integral part of the infrastructure associated with offshore oil and gas developments. These pipelines fulfill a range of functions from linking extraction wells to other subsea infrastructure to transporting products onshore, or to a central processing facility. Ancillary …
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Development of Predictability and Condition Assessability Indices for PCCP Water Mains
The condition of water and wastewater pipelines has been deteriorating with time and since this infrastructure is out-of-sight, the assessment has been neglected over the years. The advancement of technology in various fields has provided pathway for development of several technologies for …
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An Exploration of Transient Protection of Pressurized Pipelines using Air Valves
The transient response associated with systems experiencing pump power failure having undulating profiles and containing air vacuum valves (AVVs) is systematically explored to characterize the critical high points where placing AVVs has the maximum influence on the resulting transient pressures. …
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Reliability analysis and service life prediction of pipelines
Pipelines are extensively used engineering structures for conveying of fluid from one place to another. Most of the time, pipelines are placed underground, surcharged by soil weight and traffic loads. Corrosion of pipe material is the most common form of pipeline deterioration and should be …
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Reliability estimation and risk-cost optimisation of underground pipelines
… design. A large section of underground pipelines in the UK are classified as structurally deficient and functionally obsolete. Due to low visibility, condition assessment and rehabilitation of underground pipelines are frequently neglected until a catastrophic failure occurs. Providing …
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Fatigue crack growth in hydrogen pipeline steels
Pipeline hydrogen transport and distribution are contemplated for hydrogen applications. Hydrogen introduction in the natural gas pipeline systems is also considered in the power to gas (P2G) approach to utilizing excess renewable energy when the supply exceeds the demand. It is well known that …
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A Comprehensive Integrity Monitoring System for Bolted Flange Connections
… commonly utilized to link pressure vessels and pipeline systems. Although there exists a series of design codes and standards to specify the design of flange joints, multiple adverse factors, such as unexpected loads and excessively high pressures and temperatures, can directly cause leakage …
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An experimental investigation of leakage flow paths in soil surrounding leaks in water distribution systems
… the world. The problem of water losses from pipelines is a major concern due to the increasing demands. Leakage is normally responsible for a large percentage of water losses in distribution systems and results in enormous wastage of valuable resources and energy. Leaks may be developed in …
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Developing a Framework for Selecting Condition Assessment Technologies for Water and Wastewater Pipes
… North America's roads lie 1.6 million miles of pipeline that provides users with potable water and carry away wastewater. These buried infrastructure systems have been functioning for duration longer than their intended design life, often with little or no repair. Asset management of pipeline …
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Knowledge Sharing among NHS Estates and Facilities Management Teams: Insights across Managerial Levels and Organisational Contexts
… the challenges associated with medical gas pipeline systems (MGPS) during the COVID-19 pandemic, offering a unique opportunity to study KS under extraordinary conditions, where an overriding common goal helped remove many of the existing organisational and social barriers. Additionally, …
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Pressure-based leakage characterisation of bulk pipelines
Water losses in distribution systems are a huge problem internationally and also in South Africa where more than a third of the water entering the water supply networks is lost through pipe leaks. With water demand increasing due to population growth and urbanisation, water resources are under …