Tesis sobre el tema "Offshore Pipeline"
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Lavasani, Seyed Mohammadreza Miri. "Advanced quantitative risk assessment of offshore gas pipeline systems". Thesis, Liverpool John Moores University, 2010. http://researchonline.ljmu.ac.uk/5976/.
Texto completoSnyman, M. F. "Numerical modelling of an offshore pipeline laid from a barge". Master's thesis, University of Cape Town, 1989. http://hdl.handle.net/11427/21804.
Texto completoThis thesis addresses some of the issues involved in using numerical methods to simulate the laying of an offshore pipeline, the objective being to contribute to the expertise of the South African offshore technology. Of particular interest is the prediction of the stresses in the pipe during such an event. The thesis concentrates on the use and suitability of the finite element method to simulate the important aspects of the pipelaying problem. ABAQUS, a nonlinear general purpose finite element code, was chosen as numerical tool, and nonlinear effects such as geometry and drag, as well as contact and lift-off at the boundaries, are included in the models. The analysis is performed in two parts: in the static analysis the displaced equilibrium position of the pipeline under self weight, buoyancy and barge tension is sought, whilst the response due to wave action and barge motion is of interest in the dynamic analysis. Numerical experiments show the suitability of ABAQUS to model the behaviour of slender structures under both static loads and dynamic excitations.
Mohamad, Basim I. "Thermal instability of infinitely-long structures". Thesis, University of Westminster, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.386149.
Texto completoLaricchia, Francesco. "Study of offshore flexible pipelines with analytical and numerical methods". Master's thesis, Alma Mater Studiorum - Università di Bologna, 2020.
Buscar texto completoGivan, Daniel Rey. "Improved operational limits for offshore pipelay vessels". ScholarWorks@UNO, 2012. http://scholarworks.uno.edu/td/1439.
Texto completoBakouros, Y. L. "Offshore pipeline reliability prediction : An assessment of the breakdown characteristics of offshore pipelines and the development of a statistical technique to improve their reliability prediction with particular reference". Thesis, University of Bradford, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.233657.
Texto completoPaskin, Sandra. "The self-burial of seabed pipelines". Thesis, University College London (University of London), 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.327090.
Texto completoAris-Brosou, Margaux. "Soudage de polymères semi-cristallins utilisés dans l'isolation de pipeline offshore. Approches thermiques, rhéologiques et mécaniques". Thesis, Paris Sciences et Lettres (ComUE), 2017. http://www.theses.fr/2017PSLEM024/document.
Texto completoThis PhD focuses on the characterization of the materials of the insulating coating of offshore pipelines as well as the welding made between the two semi-crystalline polymers of the coating at the junction of two consecutives pipes.The important thickness of the coating induces heterogeneous heating and cooling rates during the welding process. Those rates have been characterized through the implementation of thermal sensors during the industrial process. A simulation model of the different steps of the welding process is consistent with the experimental results. This simulation gives access to the thermal fields in the entire pipe and especially in the welding zone.This study allows us to characterize the two welded materials during their melting and crystallization which represent the two crucial steps during the welding. A particular attention has been drawn to their rheological behavior in the transition zone from the molten to the solid state and vice versa. The cooling data at different rates have been correlated with the transformation fraction of the materials.The mechanical properties of the insulating materials have been tested especially in the welding zone via the industrial process. However, the imposing infrastructure of the industrial process does not allow the study of the influence of welding parameters. To do so, a “mirror” experiment, representative of the industrial one, has been developed at a laboratory scale. Both the welding made via the industrial process and the “mirror” experiment have shown that the weak point of the structure is not the welding itself but one of the materials of the coating
Fu, Zhu. "Numerical simulation of a centrifuge test related to the interaction between an ice feature and an offshore pipeline". Thesis, University of Ottawa (Canada), 2007. http://hdl.handle.net/10393/27844.
Texto completoShabani, Behnam. "Wave-Associated Seabed Behaviour near Submarine Buried Pipelines". Thesis, The University of Sydney, 2008. http://hdl.handle.net/2123/3532.
Texto completoShabani, Behnam. "Wave-Associated Seabed Behaviour near Submarine Buried Pipelines". University of Sydney, 2008. http://hdl.handle.net/2123/3532.
Texto completoSoil surrounding a submarine buried pipeline consolidates as ocean waves propagate over the seabed surface. Conventional models for the analysis of soil behaviour near the pipeline assume a two-dimensional interaction problem between waves, the seabed soil, and the structure. In other words, it is often considered that water waves travel normal to the orientation of pipeline. However, the real ocean environment is three-dimensional and waves approach the structure from various directions. It is therefore the key objective of the present research to study the seabed behaviour in the vicinity of marine pipelines from a three-dimensional point of view. A three-dimensional numerical model is developed based on the Finite Element Method to analyse the so-called momentary behaviour of soil under the wave loading. In this model, the pipeline is assumed to be rigid and anchored within a rigid impervious trench. A non-slip condition is considered to exist between the pipe and the surrounding soil. Quasi-static soil consolidation equations are then solved with the aid of the proposed FE model. In this analysis, the seabed behaviour is assumed to be linear elastic with the soil strains remaining small. The influence of wave obliquity on seabed responses, i.e. the pore pressure and soil stresses, are then studied. It is revealed that three-dimensional characteristics systematically affect the distribution of soil response around the circumference of the underwater pipeline. Numerical results suggest that the effect of wave obliquity on soil responses can be explained through the following two mechanisms: (i) geometry-based three-dimensional influences, and (ii) the formation of inversion nodes. Further, a parametric study is carried out to investigate the influence of soil, wave and pipeline properties on wave-associated pore pressure as well as principal effective and shear stresses within the porous bed, with the aid of proposed three-dimensional model. There is strong evidence in the literature that the failure of marine pipelines often stems from the instability of seabed soil close to this structure, rather than from construction deficiencies. The wave-induced seabed instability is either associated with the soil shear failure or the seabed liquefaction. Therefore, the developed three-dimensional FE model is used in this thesis to further investigate the instability of seabed soil in the presence of a pipeline. The widely-accepted criterion, which links the soil liquefaction to the wave-induced excess pressure is used herein to justify the seabed liquefaction. It should be pointed out that although the present analysis is only concerned with the momentary liquefaction of seabed soil, this study forms the basis for the three-dimensional analysis of liquefaction due to the residual mechanisms. The latter can be an important subject for future investigations. At the same time, a new concept is developed in this thesis to apply the dynamic component of soil stress angle to address the phenomenon of wave-associated soil shear failure. At this point, the influence of three-dimensionality on the potentials for seabed liquefaction and shear failure around the pipeline is investigated. Numerical simulations reveal that the wave obliquity may not notably affect the risk of liquefaction near the underwater pipeline. But, it significantly influences the potential for soil shear failure. Finally, the thesis proceeds to a parametric study on effects of wave, soil and pipeline characteristics on excess pore pressure and stress angle in the vicinity of the structure.
Nascimento, Lúcio Gomes. "Análise e estudo de estabilidade do padrão de escoamento golfadas severas num sistema pipeline-riser acoplado ao VASPS". reponame:Repositório Institucional da UnB, 2015. http://dx.doi.org/10.26512/2015.5.D.19176.
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O padrão de escoamento das golfadas severas existentes em sistemas pipeline-riser acoplados a separadores submarinos do tipo VASPS, implementados na prospecção de petróleo offshore, é caracterizada por ser do tipo instável. Uma vez que este padrão apresenta flutuações na produção, o nível de líquido no interior do VASPS muda de acordo com a frequência de produção. Além disso, ele pode causar danos permanentes à bomba do tipo BCS (bomba centrífuga submersa) inserida no fluido, ou prejudicar a eficiência da separação, produção e ainda assim prejudicar o escoamento de gás derivado do escoamento multifásico do poço. São definidos dois critérios de estabilidade em função das transições nos padrões de escoamento característicos para a estabilidade ou não do sistema de separação e produção. São fixados valores constantes para a velocidade superficial de líquido (VSL) e para as razões de ar e água (RGO) a fim de serem analisados e estudados os padrões de escoamento de acordo com cada critério atendido (eliminação ou redução das golfadas severas) e, portanto, obter os pontos de operação ideais entre as vazões e as pressões características para a manutenção de escoamento permanente de acordo com o controle da válvula de estrangulamento e/ou controle na pressão do separador. Para cada valor fixado os resultados se comportam de maneira diferente em relação ao anterior, devido a mudança do escoamento ser significativa. A partir dos resultados podem ser obtidas as equações empíricas em função dos pontos de operação ideais para a estabilidade da separação e produção multifásica e finalmente poder acoplá-las ao controle do sistema através dos mecanismos existentes.
The flow pattern of the severe slugging in pipes coupled to subsea separators type VASPS, implemented on offshore oil drilling is unstable. Once this pattern features fluctuating flow in the production, the level of liquid within the present VASPS changes according to the frequency of production. Beyond this it may cause permanent damage to the pump type ESP (electrical submersible pump) inserted in the fluid, or impair the efficiency of production separation and yet it harm the derived gas of the multiphase flow from the well. Two criteria of stability are defined in terms of the transitions of the characteristics flow patterns in relation to the flow separation and the current production system. They are fixed constant values for the superficial liquid velocity (VSL) and the air-water ratios (RGO) to be analyzed and studied the flow patterns according to each criterion attended (elimination or reduction of severe slugging flow) and thus get optimum operating points between the characteristic pressures and the flow rates for maintaining permanent flow according to the control of the choke valve and/or through control the pressure in the separator. For each set values results behave differently in relation to the previous, because the change of the flow is significant. From the results one can obtain empirical equations as a function of the optimal operating points for the stability of the separation and the multiphase flow production, and finally to associate them to the control system via existing mechanisms.
Phan, Van Trung. "Modelling of the in service behaviour of passive insulated structures for deep sea offshore applications". Thesis, Brest, 2012. http://www.theses.fr/2012BRES0098/document.
Texto completoUltra deep offshore oil exploitation presents new challenges to offshore engineering and operating companies. Such applications require the use of pipelines with an efficient thermal protection. Passive insulation materials are commonly used to guarantee the thermal performance of the pipes, and syntactic foams are now the preferred material for this application. The mechanical behaviour of such insulation materials is quite complex, associating time-dependent behaviour of polymers with damage behaviour of glass microspheres. In order to allow an optimisation of such systems, while ensuring in-service durability, accurate numerical models of insulation materials are thus required. During the service life in deep water, hydrostatic pressure is the most important mechanical loading of the pipeline, so this study aims to describe the mechanical behaviour of the material under such loading. Using a hyperbaric chamber, the analysis of the evolution of the volumetric strain with time, with respect to the temperature, under different time-evolutions of the applied hydrostatic pressure is presented in this paper. Such experimental results associated with the mechanical response of the material under uniaxial tensile creep tests, allow the development of a thermo-mechanical model, so that representative loadings can be analysed
Parks, David William. "Sub-sea gas processing". Thesis, Curtin University, 2011. http://hdl.handle.net/20.500.11937/2588.
Texto completoYeow, Kervin. "Three dimensional scour along offshore pipelines". University of Western Australia. School of Civil and Resource Engineering, 2007. http://theses.library.uwa.edu.au/adt-WU2008.0008.
Texto completoChen, Zhenxin. "The mechanical behaviour and fatigue analysis of flexible pipes". Thesis, Heriot-Watt University, 1990. http://hdl.handle.net/10399/1292.
Texto completoAune, Vegard y Morten Sagbakken Hovdelien. "Impact Against Offshore Pipelines : Experiments and Numerical Simulations". Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for konstruksjonsteknikk, 2012. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-18476.
Texto completoFarrell, J. "Hyperbaric welding of duplex stainless steel pipelines offshore". Thesis, Cranfield University, 1996. http://dspace.lib.cranfield.ac.uk/handle/1826/4513.
Texto completoSchupp, Jens. "Upheaval buckling and flotation of buried offshore pipelines". Thesis, University of Oxford, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.670004.
Texto completoNetto, Theodoro Antoun. "On the dynamics and arrest of propagating buckles in offshore pipelines /". Digital version accessible at:, 1998. http://wwwlib.umi.com/cr/utexas/main.
Texto completoKimura, Fumiaki. "Probabilistic Design of Steel Structures Applied to Offshore Pipelines". Thesis, Imperial College London, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.511814.
Texto completoHelgaker, Jan Fredrik. "Modeling Transient Flow in Long Distance Offshore Natural Gas Pipelines". Doctoral thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for energi- og prosessteknikk, 2013. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-23660.
Texto completoAntunes, Felipe da Silva. "Alternativas técnico produtivas para o aproveitamento do gás natural da camada pré-sal". Universidade do Estado do Rio de Janeiro, 2011. http://www.bdtd.uerj.br/tde_busca/arquivo.php?codArquivo=4602.
Texto completoAs reservas brasileiras de petróleo e gás natural apresentarão um significativo crescimento a partir do desenvolvimento das reservas da camada do pré-sal. Segundo estimativas elaboradas pela EPE e pela EIA, nos próximos vinte anos, haverá um quadro de grande oferta de gás natural no país, com a oferta excedendo a demanda. Como o segmento de transporte do gás natural tem grande importância na formação do custo desse energético, uma tecnologia de transporte menos onerosa irá proporcionar um cenário mais vantajoso para a entrada do gás no mercado. A presente dissertação analisa duas tecnologias disponíveis para escoamento do gás natural da camada pré-sal gasoduto submarino e gás natural liquefeito embarcado e as possibilidades de utilização no mercado interno ou para ser exportado. De acordo com dados da Petrobras, foram utilizadas três rotas para escoar o gás do pré-sal. A metodologia Valor Presente Líquido (VPL) foi utilizada para analisar qual dos investimentos em transporte é mais viável economicamente. Os resultados mostraram que de acordo com as perspectivas de produção do gás natural no horizonte de tempo analisado as duas tecnologias serão viáveis, com o transporte por gasodutos a alternativa mais viável economicamente.
The Brazilian reserves of oil and natural gas will present a significant growth from the development of the reserves of the pre-salt layer. According to estimates prepared by the EPE and the EIA, the next twenty years, the supply of natural gas will exceed demand. As the transportation sector natural gas has great importance in the formation of the cost of energy, a less costly transport technology will provide a more advantageous to enter the gas market. This dissertation examines two technologies available to transport the gas from the pre-salt layer - offshore pipeline and liquefied natural gas shipped - and the possibilities of using the domestic market or for export. According to data from Petrobras, three routes were used to drain the gas from the pre-salt. The methodology Net Present Value (NPV) was used to analyze which of the investments in transport is more economically viable. The results showed that according to the outlook for natural gas production in the time horizon analyzed the two technologies will be feasible to transport by pipeline economically the most viable alternative.
Yahaya, Nordin. "The use of inspection data in the structural assessment of corroding pipelines". Thesis, Heriot-Watt University, 1999. http://hdl.handle.net/10399/1150.
Texto completoWilliams, Elizabeth S. "Upheaval buckling of offshore pipelines buried in loose and liquefiable soils". Thesis, University of Oxford, 2014. http://ora.ox.ac.uk/objects/uuid:10c2cf4d-ab26-4f2c-82d9-35e15cfa03bc.
Texto completoBaumgard, Alexander James. "Monotonic and cyclic soil responses to upheaval buckling in offshore buried pipelines". Thesis, University of Cambridge, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.621210.
Texto completoMacaro, Giulia. "Distinct element modelling of pipe-soil interaction for offshore pipelines on granular soils". Thesis, University of Oxford, 2015. http://ora.ox.ac.uk/objects/uuid:cf38c129-502f-4d7d-aa8c-fea5d95ad2d2.
Texto completoAlam, Muhammad Shafiqul. "Lattice Boltzmann modelling of two and three-dimensional flow and scour around offshore pipelines". University of Western Australia. School of Civil and Resource Engineering, 2009. http://theses.library.uwa.edu.au/adt-WU2009.0161.
Texto completoAyoade, Adedayo. "Addressing the decommissioning problem : towards a theory of 'sustainable decommissioning' for disused offshore installations/pipelines". Thesis, University of Dundee, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.398311.
Texto completoLiang, Zuodong. "Three-Dimensional Model for Seabed Instability around Offshore Pipelines under Combined Wave and Current Loadings". Thesis, Griffith University, 2020. http://hdl.handle.net/10072/391522.
Texto completoThesis (PhD Doctorate)
Doctor of Philosophy (PhD)
School of Eng & Built Env
Science, Environment, Engineering and Technology
Full Text
Giaccobi, Stéphane. "Méthode de conception de multimatériaux à architecture multicouche : application à la conception d’une canalisation sous-marine". Thesis, Bordeaux 1, 2009. http://www.theses.fr/2009BOR13829/document.
Texto completoWhen the design requirements are either too stringent or are conflicting, no monolithic material solution exists. In such cases the selection of a multimaterial could be considered. The primary aim of this thesis is to provide a methodology for designing multi-materials with a prescribed arrangement of the constituent materials. The second objective is to apply this new methodology to the design of a submarine pipeline. From amongst the huge variety of multi-material arrangements available, this study focusses on multilayered stackings and therefore the design methodology becomes a method for selecting the materials of the stack and sizing the layers. This original approach is presented in detail using basic examples in order to match the steps of classical methods for selecting engineering materials. The constraints programming techniques were very useful for solving real multimaterial design problems. Applying this new method to the design of a submarine pipeline permits its validation and provides proof of its relevance
Santos, Marcus Vinicius Franchi dos 1983. "Um estudo comparativo de dutos em vãos livres através de simulações numéricas". [s.n.], 2015. http://repositorio.unicamp.br/jspui/handle/REPOSIP/265806.
Texto completoDissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Mecânica e Instituto de Geociências
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Resumo: Vibrações Induzidas por Vórtices em dutos com vãos livres sujeitos a corrente marítima é um problema presente na indústria offshore. Embora significativos esforços tenham sido feitos para entender este complicado problema de interação fluido estrutura, a modelagem numérica para cálculo é ainda um grande desafio. O presente trabalho tem como objetivo principal caracterizar o comportamento dinâmico dos dutos em vãos livres sob os efeitos do fenômeno da vibração induzida por vórtices (VIV). A disponibilidade de diversos programas de cálculo de VIV para estruturas offshore esbeltas facilita a avaliação da vida útil dessas estruturas e reduz o custo de projetos. No entanto, um bom domínio das metodologias adotadas por programas utilizados na indústria e a consciência das limitações correspondentes a diferentes técnicas são fundamentais para que o analista faça uso adequado dessas ferramentas computacionais. Neste sentido, este trabalho faz uma revisão dos diferentes modelos para estimar as forças de VIV devidas à corrente marinha. Para isto, diferentes programas de computador foram utilizados para calcular as vibrações na direção transversal de incidência de corrente, provocadas pelo desprendimento de vórtices em um duto com vão livre. As simulações do comportamento dinâmico da parcela em vão livre do duto foram realizadas utilizando três abordagens, respectivamente: modelos hidrodinâmicos de força de VIV semi-empíricos, no domínio da frequência; modelos hidrodinâmicos de força de VIV semi-empíricos, baseados nos coeficientes de sustentação e número de Strouhal, no domínio do tempo e um modelo hidrodinâmico de wakeoscillator, no domínio do tempo. Os resultados das simulações são analisados através de comparações com dados experimentais. Além disso, as limitações da cada modelo são discutidas
Abstract: Vortex induced vibration (VIV) of free span pipeline subjecting to ocean current is a present problem in the offshore industry. Although significant efforts have done to understand this complicated fluid structure interaction problem, the numerical modeling and predicting is still a big challenge. The primary objective of this work is to characterize the dynamic behavior of pipelines with free span under the effects of the Vortex-Induced Vibration (VIV) phenomenon. Different models to estimate VIV forces due to sea current are discussed. For this purpose, different computer programs were used to predict vibrations in the transverse direction of the current incidence direction, caused by the vortex shedding in a free span of the pipeline. Simulations of the dynamic behavior of a free span portion of the pipeline were carried out by two approaches, respectively: semi-empirical hydrodynamic VIV force model, in frequency domain and, semi-empirical VIV force model based on the lift coefficient and Strouhal number, in time domain and a wake oscillator in time domain. Simulations results are analyzed through comparisons with experimental data and also limitations of the each model are discussed
Mestrado
Explotação
Mestre em Ciências e Engenharia de Petróleo
Krupiński, Szymon. "Suivi des structures offshore par commande référencée vision et multi-capteurs". Thesis, Nice, 2014. http://www.theses.fr/2014NICE4051.
Texto completoThis thesis deals with a control system for a underwater autonomous vehicle given a two consequent tasks: following a linear object and stabilisation with respect to a planar target using an on-board camera. The proposed solution of this control problem takes advantage of a cascading nature of the system and divides it into a velocity pilot control and two visual servoing schemes. The serving controllers generate the reference velocity on the basis of visual information; line following is based on binormalized Pluecker coordinates of parallel lines corresponding to the pipe contours detected in the image, while the stabilisation relies on the planar homography matrix of observed object features, w.r.t. the image of the same object observed at the desired pose. The pilot, constructed on the full 6 d.o.f. nonlinear model of the AUV, assures that the vehicle’s linear and angular velocities converge to their respective setpoints. Both image servoing schemes are based on minimal assumptions and knowledge of the environment. Validation is provided by a high-fidelity 6 d.o.f. dynamics simulation coupled with a challenging 3D visual environment, which generates images for automatic processing and visual servoing. A custom simulator is built that consist of a Simulink model for dynamics simulation and the MORSE robot and sensor simulator, bound together by ROS message passing libraries. The OpenCV library is used for real-time image processing. Methods of visual data filtering are described. Thus generated experimental data is provided that confirms the desired properties of the control scheme presented earlier
Woodson, Ross D. "Offshore pipeline failures". Thesis, 1990. http://hdl.handle.net/10945/28420.
Texto completoArjomandi, Kaveh. "MECHANICAL RESPONSE OF SANDWICH PIPES SUBJECT TO HYDROSTATIC PRESSURE AND BENDING". Thesis, 2010. http://hdl.handle.net/10222/13156.
Texto completoLee, Liang-hai 1973. "On the design of slip-on buckle arrestors for offshore pipelines". Thesis, 2007. http://hdl.handle.net/2152/3734.
Texto completoHuang, John Chih-Ming. "On the arresting efficiency of spiral buckle arrestors for offshore pipelines". Thesis, 2012. http://hdl.handle.net/2152/ETD-UT-2012-05-5490.
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Iranpour, Mohammad. "FATIGUE CHARACTERIZATION OF RISERS AND PIPELINES UNDER REALISTIC VARIABLE AMPLITUDE LOADING AND THE INFLUENCE OF COMPRESSIVE STRESS CYCLES". Thesis, 2013. http://hdl.handle.net/10222/50472.
Texto completoNourpanah, Nikzad. "Integrity and Fracture Response of Offshore Pipelines Subject to Large Plastic Strains". 2011. http://hdl.handle.net/10222/13299.
Texto completoRazi, Pejman. "DEVELOPMENT OF A VIBRATION-BASED HEALTH MONITORING STRATEGY FOR ONSHORE AND OFFSHORE PIPELINES". 2013. http://hdl.handle.net/10222/42699.
Texto completoMullan, Sean. "Tidal sedimentology and geomorphology in the central Salish Sea straits, British Columbia and Washington State". Thesis, 2017. https://dspace.library.uvic.ca//handle/1828/8943.
Texto completoGraduate
2018-12-07