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Dissertations / Theses on the topic 'Flexible pipe'

Author: Grafiati

Published: 4 June 2021

Last updated: 26 July 2025

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1

Reginold, Jesuthasan Terence. "Rocker pipe solution to alleviate settlement induced distress in flexible pipes." Thesis, University of East London, 2006. http://roar.uel.ac.uk/1257/.

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A number of earlier researchers investigated the soil structure interaction parameters which affect the structural behaviour of buried flexible pipes. However, it was not until the mid-1990s that the importance of rocker pipe design to accommodate differential settlement raised awareness of the consequent absence in current design procedure [BS EN 1295-3; 1998]. This study widens the understanding of the effect of differential ground movements on the behaviour of flexible pipes to address concerns raised to the Committee European de Normalisation. Many pipeline failures result from the excessi

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2

Li, Henan. "Flexible Pipe Stress and Fatigue Analysis." Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for marin teknikk, 2012. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-18646.

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Fatigue is an important character for the flexible pipes as they are always exposed to dynamic loading. For nonbonded flexible pipes, fatigue and stress analysis can be performed based on different assumptions of slip behaviour. Different slip assumptions used in estimating the slip stress always play a determinative role in the prediction of fatigue damage. Thus, this thesis will focus on the study of the slip behaviour between tensile armour layers of nonbonded flexible pipes. The results can be used to support the basic assumptions for further fatigue analysis. The main object of this thesi

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3

Sævik, Svein. "On stresses and fatigue in flexible pipes." Norway : Dept. of Marine Structures, the University of Trondheim, 1992. http://catalog.hathitrust.org/api/volumes/oclc/27348152.html.

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4

Kebadze, Elizbar. "Theoretical modelling of unbonded flexible pipe cross-sections." Thesis, London South Bank University, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.326762.

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5

Ryan, M. S. "The dynamic analysis of flexible riser systems." Thesis, Cranfield University, 1988. http://hdl.handle.net/1826/3670.

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The aim of this thesis is to provide a design tool for the engineering analysis of the dynamics of a flexible riser system. The design tool is piovided in the form of a computer program. The two main requirements of such a program are that it is realistic and practical to use. The necessary theory is developed to allow these requirements to be satisfied. To ensure accuracy checks are made against model tests and known analytical solutions. How the computer program may be used is shown by analysing a particular riser configuration.

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6

Kim, David Donghyun. "Flexible in-pipe leak detection sensor module design and fabrication." Thesis, Massachusetts Institute of Technology, 2015. http://hdl.handle.net/1721.1/101541.

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Thesis: S.M., Massachusetts Institute of Technology, Department of Mechanical Engineering, 2015.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (pages 83-84).<br>Recent pipe bursts and explosions have caused not only financial losses but also a threat to public safety. Due to the recent incidents, governments have imposed strict laws with an increase in inspection regulation requirements. Large size networks make manual inspection of an entire complex system almost impossible. The need for autonomous automatic inspection systems is evident. A robust autonomous

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7

Loverich, James S. "Life Prediction of Composite Armor in an Unbonded Flexible Pipe." Thesis, Virginia Tech, 1997. http://hdl.handle.net/10919/35873.

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Composite materials are under consideration for the replacement of steel helical tendons in unbonded flexible pipes utilized by the offshore oil industry. Higher strength to weight ratios and increased corrosion resistance are the primary advantages of a composite material for this application. The current study focuses on the life prediction of a PPS/AS-4 carbon fiber composite proposed for the above employment. In order to accomplish this task, the properties of the material were experimentally characterized at varying temperatures, aging times and loadings. An analytic technique was develop

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8

Kennedy, I. "Vibration transmissibility characteristics of fibre and steel reinforced flexible pipes." Thesis, University of Manchester, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.378334.

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9

Bircan, Mehmet. "A Study On The Effect Of Pipe - Soil Relative Stiffness On The Behaviour Of Buried Flexible Pipes." Master's thesis, METU, 2010. http://etd.lib.metu.edu.tr/upload/2/12611562/index.pdf.

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In this study, the effect of pipe-soil relative stiffness on the behaviour of buried flexible pipes was investigated considering the pipe size, material type, stiffness, pipe-soil and natural soil-backfill interfaces and geometry of the trench using the finite element method. For this purpose, a parametric study was conducted to examine the effect of different variables on the resulting earth loads and deformations imposed on the buried pipes. Various types of trench pipe-soil cases were analysed for a certain natural ground and backfill material by the PLAXIS finite element code which allows

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10

Lim, Soon Yau. "Fundamental aspects of helical wire reinforcement for flexible pipe pressure armour." Thesis, University College London (University of London), 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.428332.

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11

Champneys, Alan R. "The nonlinear dynamics of articulated pipes conveying fluid." Thesis, University of Oxford, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.302850.

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12

Bahtui, Ali. "Development of a constitutive model to simulate unbonded flexible riser pipe elements." Thesis, Brunel University, 2008. http://bura.brunel.ac.uk/handle/2438/3010.

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The principal objective of this investigation is to develop a constitutive model to simulate the hysteresis behaviour of unbonded flexible risers. A new constitutive model for flexible risers is proposed and a procedure for the identification of the related input parameters is developed using a multi-scale approach. The constitutive model is formulated in the framework of an Euler-Bernoulli beam model, with the addition of suitable pressure terms to the generalised stresses to account for the internal and external pressures, and therefore can be efficiently used for large-scale analyses. The d

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13

Naito, J., Z. Y. Tan, M. Shikida, M. Hirota, and K. Sato. "Characteristics of On-Wall In-Tube Flexible Thermal Flow Sensor at Wrap Pipe Condition." IEEE, 2007. http://hdl.handle.net/2237/9560.

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14

Wang, Lidong. "Comparing alternative flexible pipe fatigue stress models with focus on the Bflex helix models." Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for marin teknikk, 2014. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-26066.

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this thesis deals with the stress and slip behaviour for non-bonded flexible pipe of three different models (itcode0, itcode1 and fullfe), comparisons are made among these three models. Besides, pipes with different cross sections are analysed, namely 4 inch, 6 inch, 7.5 inch, 8 inch, and 16 inch pipe cases. In addition to the two tensile layers pipe construction for all the pipe size cases, the 7.5 inch pipe with four tensile layers case is also included. The main advantage of this thesis is the application of the new developed beam elements in Bflex2010, namely HSHEAR353, HSHEAR363 and HCONT

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15

Al, Hasan Hisham H. "Design and analysis of a flexible tendon-driven joint for in-pipe inspection robots." Thesis, Massachusetts Institute of Technology, 2013. http://hdl.handle.net/1721.1/83682.

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Thesis (S.B.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2013.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (pages 53-54).<br>Leaks in water distribution pipelines result in potentially significant losses of water resources and energy. The detection of such leaks is crucial for effective water resource management. In-pipe robots equipped with sensing devices are high potential solutions for accurate, efficient, and inexpensive leak detection. This work discusses the design, prototyping, and analysis of a tendon-driven flexible ro

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16

Shah, Jigar. "Laboratory Characterization of controlled low-strength material and its application to construction of flexible pipe drainage system." Ohio University / OhioLINK, 2000. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1172866182.

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17

Yang, John Chen. "Characterizing the Degradation of Nylon-11 and PVDF in a Flexible Oil Pipe and Cure Monitoring of Chemflake Vinylester." W&M ScholarWorks, 1996. https://scholarworks.wm.edu/etd/1539626822.

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18

Fikru, Mahelet Getachew. "Mergers and Acquisitions with a Flexible Policy Regime: Theoretical and Empirical Analysis." OpenSIUC, 2011. https://opensiuc.lib.siu.edu/dissertations/325.

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The research examines what drives Mergers and Acquisitions (M&As) using a theoretical and empirical approach. The theoretical part uses flexible optimal policies which adjust to changes in the market structure following a merger. The empirical part tests the major theoretical predictions to identify determinants of M&As in advanced economies. Chapters 1 and 2 consider M&As among firms in a pollution-intensive sector. Chapter 1 shows that identical polluting firms engage in M&As only if environmental policies are flexible. Chapter 2 shows that the flexibility of environmental policy increases t

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19

FARIA, MARCUS VINICIUS COMODO LAURIA DE. "APPLICATION POTENTIAL OF AN FE-C-NI ALLOY IN FLANGED CONNECTION OF END FITTING OF FLEXIBLE PIPE UNDER CRYOGENIC CONDITIONS." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2016. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=29715@1.

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PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO<br>COORDENAÇÃO DE APERFEIÇOAMENTO DO PESSOAL DE ENSINO SUPERIOR<br>PROGRAMA DE SUPORTE À PÓS-GRADUAÇÃO DE INSTS. DE ENSINO<br>Durante o tempo em serviço, estruturas e componentes de equipamentos podem falhar e causar acidentes. Isto geralmente conduz a danos materiais podendo, ainda, causar perda de vidas humanas e danos ambientais. Frequentemente, os eventos danosos são originários de falhas de materiais e de fabricação, sobrecargas não previstas ou outros problemas oriundos do tempo de operação ou deficiência de manutenção de um componente.

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20

Cornacchia, Francesco. "Theoretical and numerical models of innovative cross-sections for flexible pipelines in research and design." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2018.

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The thesis is focused on two different issues relative to reinforced flexible pipelines for the unbonded cases: tensile force and external pressure. Mainly, the work is carried out comparing theoretical and numerical models for what concerns reinforced flexible pipes, then the analytical models were used for parametric studies and comparison with composite - based pipelines. For the numerical simulation, the FEM software used was ABAQUS. The elevation point for the tensile load case was involving the pressure armor layer in the design of the cross-section and exploiting the plastic properties

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21

Schmitz, Cristiane Salerno. "Análise do comportamento estrutural de sistemas de drenagem viária constituídos por tubos plásticos flexíveis envolvidos com areia." Universidade de São Paulo, 2002. http://www.teses.usp.br/teses/disponiveis/3/3138/tde-09052003-161505/.

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Este trabalho objetivou o conhecimento do comportamento estrutural de um sistema solo-tubo plástico flexível de paredes estruturadas frente a cargas permanentes sobre a tubulação e carregamentos móveis, como os provenientes de tráfego de veículos. Para o estudo, foram construídas valas em verdadeira grandeza na Área de Pesquisas e Testes de Pavimentos DAER-RS/UFRGS em Porto Alegre, RS, onde se dispõe de um equipamento simulador de tráfego, utilizado para aplicação de cargas estáticas e cíclicas na superfície dos sistemas solo-tubo. As variáveis independentes controladas são o grau de compactaç

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22

Fontana, Walter Andrey. "Emprego de cabos de aço como armadura de tração para a aplicação em dutos flexíveis." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2013. http://hdl.handle.net/10183/87269.

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A necessidade de exploração de petróleo em águas profundas exige o emprego de dutos flexíveis com desempenho em fadiga adequado, sendo as armaduras de tração deste tipo de duto as camadas mais críticas para este tipo de solicitação. Atento a isto, este trabalho mostra o desenvolvimento de um novo conceito de armaduras de tração, que são construídas com cabos de aço. Para avaliar o desempenho dos cabos de aço na armadura tração foi elaborada uma configuração de armadura, com a seleção e aplicação de cabos de aço disponíveis no mercado nacional. Além da caracterização metalúrgica, dimensional e

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23

Xavier, Flávio Galdino. "Avaliação da vida em fadiga de um novo modelo de terminal conector para dutos flexíveis." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2009. http://hdl.handle.net/10183/17492.

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Este trabalho foca a avaliação da vida em fadiga de um novo modelo de terminal conector para dutos flexíveis (risers) de camadas não aderentes (unbonded). Os ensaios foram feitos levando em consideração apenas a parte estrutural desses dutos, de forma a ensaiar uma nova configuração de ancoragem da armadura de tração encontrada nesse equipamento conhecido como terminal conector (end fitting). É dentro deste componente que os arames da armadura de tração são fixados por resina epóxi em conjunto com uma configuração específica permitindo dessa maneira a sustentação do duto flexível quando fixado

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24

Bueno, Antonio Fernando Burkert. "Avaliação das armaduras de tração de riser flexível durante ensaios axiais de tração e fadiga." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2010. http://hdl.handle.net/10183/24713.

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O presente trabalho tem como objetivo avaliar as tensões atuantes no conjunto conector e duto flexível de camadas não aderentes durante ensaios com carregamentos axiais de tração e fadiga. Estes ensaios são utilizados para a qualificação de dutos flexíveis. Foram desenvolvidos e patenteados alguns modelos de conectores contemplando apenas a parte estrutural. Ensaios preliminares de tração e fadiga, com dois conectores diferentes e um segmento de riser de dimensões reduzidas, foram realizados visando a seleção do modelo de melhor desempenho em um pórtico. O conector de melhor desempenho foi ent

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25

Mendonça, Heloisa Guedes. "Análise paramétrica do efeito de cargas de esmagamento e estrangulamento sobre um tubo flexível na operação de lançamento." Universidade de São Paulo, 2016. http://www.teses.usp.br/teses/disponiveis/3/3135/tde-08122016-092438/.

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Tubos flexíveis são amplamente utilizados na indústria offshore. Essas estruturas são empregadas no transporte de fluidos, na exploração de petróleo em águas profundas. Suas diversas camadas conferem propriedades, como a resistência mecânica e a impermeabilidade, que são importantes em ambientes de condições adversas. A instalação é uma etapa crítica da vida útil dos tubos flexíveis, visto que os carregamentos de lançamento podem danificar a estrutura dos mesmos. As cargas predominantes durante essa etapa são o peso próprio da linha, os esforços de compressão radial que são impostos ao tubo pe

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26

Dommaraju, Sunny Raj. "Design and Implementation of a 16-Bit Flexible ROM-less Direct Digital Synthesizer in FPGA and CMOS 90nm Technology." Wright State University / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=wright1374351629.

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27

Provasi, Rodrigo. "Contribuição ao projeto de cabos umbilicais e tubos flexíveis: ferramentas de CAD e modelo de macro elementos." Universidade de São Paulo, 2012. http://www.teses.usp.br/teses/disponiveis/3/3152/tde-29072013-120723/.

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A Engenharia Offshore está sempre em evolução, motivada pela busca de novos poços de petróleo, o que acarreta em maiores lâminas dágua e demanda novas tecnologias que tornem o processo viável. Neste contexto, não apenas novos tipos de plataformas são desenvolvidas, mas também novos tipos de tubos flexíveis e cabos umbilicais. A maior dificuldade de gerar esses novos tipos de cabos é determinar a sua viabilidade. Tubos flexíveis e cabos umbilicais são de difícil modelagem, devido à interação entre as camadas, além de difícil concepção, dada a grande variedade de componentes e o grande número de

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28

Wallauer, Frederico Alberto. "Materiais para aplicação em arames da armadura de tração de dutos flexíveis : comportamento frente a entalhes." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2015. http://hdl.handle.net/10183/133138.

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A armadura de tração de dutos flexíveis é a camada responsável por suportar as cargas axiais destes equipamentos em campo. Com a tendência de aumento das profundidades de exploração e produção de petróleo offshore, principalmente dos campos do pré-sal brasileiro, faz-se necessário o uso de materiais com desempenho superior. Este trabalho buscou avaliar e comparar dois aços de alta resistência mecânica para tal aplicação, um predominantemente perlítico e outro martensítico. Durante a vida em serviço destes componentes, eles sofrem tensões axiais cíclicas associadas ao processo de corrosão, que

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29

Angelo, Rafaela Machado de. "Análise numérica de uma tubulação enterrada submetida a carregamentos móveis." Universidade de São Paulo, 2016. http://www.teses.usp.br/teses/disponiveis/18/18132/tde-02052016-160148/.

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Este trabalho apresenta um estudo sobre o comportamento de tubos metálicos enterrados, submetidos ao carregamento móvel de um veículo. Foram realizadas análises numéricas utilizando o método de elementos finitos para o cálculo da tensão vertical no solo, momento fletor, tensão normal e deformação diametral vertical do tubo. Foram analisados 630 modelos, obtidos da variação das características do solo (módulo de elasticidade) com o objetivo de representar diferentes níveis de compactação do solo, características do tubo (espessura da parede do tubo) e da altura da camada de recobrimento do solo

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30

Nygård, David. "Tensile armour buckling in flexible pipes." Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for marin teknikk, 2012. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-18652.

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The exible pipelines has been widely used by the oil and gas industry the lastdecades and this trend is expected to continue as the operating depths are increasedfurther. For deep water applications the radial and lateral buckling modes can becritical. Many studies has been carried out using nite element models to studythese failure modes.In this thesis a nite element model is created with the aim to recreate resultsobtained in a recently published article by Vaz and Rizzo. The model is built upusing pipe, beam, contact and spring elements to represent the complex behaviourof the cross section

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31

Warnakulasuriya, Hapuhennedige Surangith. "Soil structure interaction of buried pipes." Thesis, University of East London, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.286607.

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32

Ducret, Fabrice. "Studies of sound generation and propagation in flow ducts." Licentiate thesis, Stockholm : Royal Institute of Technology, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-4049.

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33

Baradaran-Seyed, Farman. "On the dynamics of flexible risers and suspended pipes." Thesis, University College London (University of London), 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.722589.

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Liu, Xueying. "Dynamic Response of Flexible Pipes Considering Different Damping Models." Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for marin teknikk, 2014. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-26253.

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Flexible pipe is a layered structure composed of plastic and steel materials. Under a large bending moment, the pipe layers may slide relative to each other due to internal friction. The moment curvature relationship for the flexible pipe is a tri-linear curve. Under cyclic bending moment, a hysteresis loop will be formed in the moment curvature curve. The area of the loop is the energy loss due to the internal friction. This thesis is aimed to study the effects of hysteresis damping on the global analysis of the flexible riser. To begin with, a review on the flexible pipe technology and nonli

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Chen, Zhenxin. "The mechanical behaviour and fatigue analysis of flexible pipes." Thesis, Heriot-Watt University, 1990. http://hdl.handle.net/10399/1292.

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Tan, Zhimin. "On the mechanics of flexible pipes, umbilicals and marine cables." Thesis, University College London (University of London), 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.338079.

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Glennon, Dermot. "A study of the molecular organisation in structural PVDF." Thesis, University of Portsmouth, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.310418.

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Massicotte, Daniel. "Finite element calculations of stresses and deformations in buried flexible pipes." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape4/PQDD_0018/MQ57140.pdf.

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Jamin, Stéphane. "Stability of thin and thick flexible pipes subjected to axial flow." Thesis, McGill University, 2011. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=97221.

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Have you ever experienced oscillatory motions of the free end your hose while watering your garden? This ordinary phenomenon of a pipe conveying fluid has asserted itself as a paradigm since it is described by quite simple equations and its study has various applications in engineering systems such as heat exchangers, blood circulatory systems as well as mining operations. The scope of the present work is the study of the dynamics of two different kinds of cylindrical pipes: (i) a cantilevered thin-walled pipe, i.e. a cylindrical shell, aspirating air and (ii) a thick-walled pipe subjected to

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Don, Rasika Perera Solangarachchige. "Investigation of fretting behaviour in pressure armour layers of flexible pipes." Thesis, Sheffield Hallam University, 2007. http://shura.shu.ac.uk/20219/.

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The incidence of fretting damage in the pressure armour wires of flexible pipes used in offshore oil explorations has been investigated. A novel experimental facility which is capable of simulating nub and valley contact conditions of interlocking wire winding with dynamic slip, representative of actual pipe loading, has been developed. The test set-up is equipped with a state of the art data acquisition system and a controller with transducers to measure and control the normal load, slip amplitude and friction force at the contact, in addition to the hoop stress in the wire. Tests were perfor

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Edmans, Ben. "Non-linear finite element analysis of flexible pipes for deep-water applications." Thesis, Brunel University, 2013. http://bura.brunel.ac.uk/handle/2438/11178.

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Flexible pipes are essential components in the subsea oil and gas industry, where they are used to convey fluids under conditions of extreme external pressure and (often) axial load, while retaining low bending stiffness. This is made possible by their complex internal structure, consisting of unbonded components that are, to a certain extent, free to move internally relative to each other. Due to the product's high value and high cost of testing facilities, much e ort has been invested in the development of analytical and numerical models for simulating flexible pipe behaviour, which includes

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Cameron, Donald Anthony. "Analysis Of Buried Flexible Pipes In Granular Backfill Subjected To Construction Traffic." Thesis, The University of Sydney, 2005. http://hdl.handle.net/2123/680.

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This thesis explores the design of flexible pipes, buried in shallow trenches with dry sand backfill. The thesis reports the comprehensive analysis of twenty-two full-scale load tests conducted between 1989 and 1991 on pipe installations, mainly within a laboratory facility, at the University of South Australia. The pipes were highly flexible, spirally-wound, uPVC pipes, ranging in diameter from 300 to 450 mm. Guidelines were required by industry for safe cover heights for these pipes when subjected to construction traffic. The tests were designed by, and conducted under the supervision of, th

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Cameron, Donald Anthony. "Analysis Of Buried Flexible Pipes In Granular Backfill Subjected To Construction Traffic." University of Sydney. Civil Engineering, 2005. http://hdl.handle.net/2123/680.

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This thesis explores the design of flexible pipes, buried in shallow trenches with dry sand backfill. The thesis reports the comprehensive analysis of twenty-two full-scale load tests conducted between 1989 and 1991 on pipe installations, mainly within a laboratory facility, at the University of South Australia. The pipes were highly flexible, spirally-wound, uPVC pipes, ranging in diameter from 300 to 450 mm. Guidelines were required by industry for safe cover heights for these pipes when subjected to construction traffic. The tests were designed by, and conducted under the supervision of, th

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Chen, Minghao. "Fatigue analysis of flexible pipes using alternative element types and bend stiffener data." Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for marin teknikk, 2011. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-15817.

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The flexible pipe is a vital part of a floating production system. The lifetime of a flexible riser system is crucial for the Health Safety and Environment (HSE) management. As a result of this, it is very necessary to carry out research on the lifetime of flexible pipe. In this thesis we formalized analysis on flexible pipes, utilizing the finite element analysis software BFLEX 2010, developed by MARINTEK. Chapter 1 describes basic knowledge about flexible pipe and relevant facilities. Chapter 2 gives more information about failure mode of flexible pipe and flexible pipe system. The design cr

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Alzabeebee, Saif Imad Akoobi. "Enhanced design approaches for rigid and flexible buried pipes using advanced numerical modelling." Thesis, University of Birmingham, 2017. http://etheses.bham.ac.uk//id/eprint/8004/.

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Buried pipelines are a vital element in maintaining modern life, as they provide a convenient way for transporting products such as gas, potable water, storm water and waste water. These buried structures have to resist external forces due to backfill soil weight and traffic loading. Therefore, the buried pipe needs to be designed properly to withstand these forces. However, careful examination of the current design standards showed significant issues with the existing design methodology for both rigid and flexible pipes. Thus, this research aimed to use advanced finite element modelling and n

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Toni, Fernando Geremias. "Parallelized element-by-element architecture for structural analysis of flexible pipes using finite macroelements." Universidade de São Paulo, 2018. http://www.teses.usp.br/teses/disponiveis/3/3152/tde-19092018-093832/.

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Flexible pipes are used in the offshore oil production to transport fluid and gas from the sea bead to the floating stations, and vice versa. These pipes have several concentric layers, of different materials, geometries and structural functions, since they are exposed to adverse operating environments, subjected to high internal and external pressures, high axial stresses and a series of dynamic loads. The local analysis is an important stage of a flexible pipe design and it consists on determining the stresses and strains distributions along the layers of the pipe. Multipurpose finite elemen

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Shi, Yunzhu. "Comparison of the stress distribution in the metallic layers of flexible pipes using two alternative Bflex formulations." Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for marin teknikk, 2014. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-26070.

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Axisymmetric load is the most common load acting on flexible pipe. Modelling axisymmetric load correctly is very important to estimate the strength of a flexible pipe. The purpose of the thesis is to compare the stress distribution in metallic layers under three load case, i.e. tension, internal pressure and external pressure. Literature study and discussion to mechanical properties of flexible pipe and finite element modelling method are included in the thesis. The modelling program is BFLEX program. Models for three flexible pipes are built in BFLEX for 6inch pipe, 8inch pipe and 16inch pipe

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Borges, Marcelo Favaro. "Correlação numérica-experimental da redução da vida em fadiga de dutos flexíveis operando com anular alagado na presença de CO2." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2017. http://hdl.handle.net/10183/172110.

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A exploração de petróleo em alto mar traz consigo desafios crescentes com o aumento da lâmina d’água e do grau de agressividade dos contaminantes presentes no fluido produzido. Sendo a produção no País majoritariamente escoada do poço para as unidades de produção por dutos flexíveis, faz-se necessária a realização de estudos aprofundados da influência destas condições na vida em fadiga destes equipamentos. Tais condições quando associadas ao alagamento da região anular dos dutos flexíveis, pode favorecer a corrosão das armaduras de tração, responsáveis por conferir resistência axial ao duto. E

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Salles, Rafael. "Experimental analysis of fluid-structure interaction phenomena on a vertical flexible cylinder: modal coeficients and parametric resonance." Universidade de São Paulo, 2016. http://www.teses.usp.br/teses/disponiveis/3/3152/tde-25082016-085120/.

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Oil and gas exploitation in deep waters has become more than just a profit business to be a daily necessity, since the world energy matrix is based on fossil components. Risers are offshore structures that are intimately linked with oil and gas exploitation and those are subjected to a great variety of effects in field, e.g., marine currents, Vortex Induced Vibration (VIV), heave motion caused by gravitational waves, non-linear contact with the sea floor, and many others. Riser dynamics is essentially non-linear and experimental tests in real scale are almost impossible due to a great variety

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Junior, Roberto Ramos. "Modelos analíticos no estudo do comportamento estrutural de tubos flexíveis e cabos umbilicais." Universidade de São Paulo, 2001. http://www.teses.usp.br/teses/disponiveis/3/3132/tde-23022016-090447/.

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Tubos flexíveis e cabos umbilicais têm sido bastante utilizados pela indústria petrolífera em aplicações offshore nos últimos anos. Os primeiros consistem num tipo de tubulação usada para o transporte de vários tipos de fluidos, geralmente trabalhando a alta pressão. Já os cabos umbilicais são usados para permitir o controle e a comunicação entre equipamentos submersos e de superfície. Quanto à concepção estrutural, os dois tipos de produto são muito semelhantes, apresentando diversas camadas metálicas combinadas com camadas plásticas concêntricas de modo a formar uma estrutura com grande rigi

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