Relevant bibliographies by topics / Offshore Pipeline

Academic literature on the topic 'Offshore Pipeline'

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Published: 4 June 2021
Last updated: 20 February 2023

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Journal articles on the topic "Offshore Pipeline"

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Kharionovskiy, V. V. "Offshore Pipeline Safety." Occupational Safety in Industry, no. 5 (May 2022): 7–14. http://dx.doi.org/10.24000/0409-2961-2022-5-7-14.

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Due to the nature of the development of gas transmission network, the problem of ensuring reliability and safety of the underwater gas pipelines was practically exhausted by the calculation of underwater crossings through the rivers, lakes, and other water barriers. However, in recent years in connection with the development of oil and gas fields on the shelf, and the globalization of the gas transmission network, the question came up related to designing, building, and subsequently ensuring the stable operation of the offshore deep-water pipelines. Individual information about the accident rate of the offshore pipelines is given. They mainly concern the coastal pipelines transporting raw materials from the offshore production platforms to the onshore terminal. The largest number of accidents is typical for the pipelines of small diameters (2–6 inches) — 59 % of their total number. A group of medium-diameter pipelines (8–16 inches) accounts for 32 % of accidents. Pipelines of large diameter (18–36 inches) are the least susceptible to damage — about 3 % of accidents. In recent decades, the offshore main gas pipelines were widely used and are considered as the most promising way of transporting gas due to higher reliability, safety, and environmental friendliness, as well as the advantages of direct Analysis is presented in the article concerning the accident rate and features of failures of the offshore gas pipelines. The criteria of limit states and the algorithm for calculating the stress-strain state of the offshore pipeline, which are the main part of the safety assessment, are given. Methodology for the safety of the offshore gas pipelines was developed, based on which the example of the safety assessment of the Blue Stream gas pipeline is given. The materials of the article were used in the development of the projects for the offshore gas pipelines and are also included in the industry regulatory document.
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Ervina Efzan, Mohd Noor, and S. Kesahvanveraragu. "Review on Pipelines in Offshore Platform Processing System." Applied Mechanics and Materials 695 (November 2014): 684–87. http://dx.doi.org/10.4028/www.scientific.net/amm.695.684.

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Pipelines are essential for transporting energy utilities such as oil, natural gas and coal for the nation. Similarly, pipelines are the only medium installed at offshore region to convey oil, gas, chemicals and water. Currently, corrosion is being a major problem for offshore pipeline occurrences around the world. Hence, this paper discussed on the pipelines in offshore platform and the corrosion of corresponding pipeline materials.
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Liu, Peng, Shi Yuan Wu, and Le Kang. "Upheaval Buckling Analysis of Buried Offshore Pipelines under High Temperature and High Pressure." Advanced Materials Research 919-921 (April 2014): 292–95. http://dx.doi.org/10.4028/www.scientific.net/amr.919-921.292.

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Nonlinear finite element upheaval buckling model of buried offshore pipelines under HT/HP is built using ABAQUS. The petroleum is defined as uniform flow; temperature field of offshore pipelines produced in the process of petroleum transportation is obtained by heat transfer analysis; offshore pipelines are buried in trench of sandy seabed, interaction between seabed and offshore pipelines is defined as friction, seabed interaction with offshore pipelines will limit the movement of offshore pipelines; coupled fluid-structure analysis for three phase model of oil-pipe-soil is conducted to obtain stress under HT/HP. Initial imperfection of pipeline is introduced to calculate upheaval buckling of buried offshore pipeline under HT/HP. Through numerical analysis, the axial force of pipelines under HT/HP is obtained and thus resulted in upheaval buckling.
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Seth, Debtanu, Bappaditya Manna, Jagdish Telangrao Shahu, Tiago Fazeres-Ferradosa, Francisco Taveira Pinto, and Paulo Jorge Rosa-Santos. "Buckling Mechanism of Offshore Pipelines: A State of the Art." Journal of Marine Science and Engineering 9, no. 10 (October 1, 2021): 1074. http://dx.doi.org/10.3390/jmse9101074.

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The buckling analysis of an offshore pipeline refers to the analysis of temperature-induced uplift and lateral buckling of pipelines by analytical, numerical, and experimental means. Thus, the current study discusses different research performed on thermal pipe-buckling and the different factors affecting the pipeline’s buckling behaviour. The current study consists of the dependency of the pipe-buckling direction on the seabed features and burial condition; the pre-buckling and post-buckling load-displacement behaviour of the pipeline; the effect of soil weight, burial depth, axial resistance, imperfection amplitude, temperature difference, interface tensile capacity, and diameter-to-thickness ratio on the uplift and lateral resistance; and the failure mechanism of the pipeline. Moreover, the effect of external hydrostatic pressure, bending moment, initial imperfection, sectional rigidity, and diameter-to-thickness ratio of the pipeline on collapse load of the pipeline during buckling were also included in the study. This work highlights the existing knowledge on the topic along with the main findings performed up to recent research. In addition, the reference literature on the topic is given and analysed to contribute to a broad perspective on buckling analysis of offshore pipelines. This work provides a starting point to identify further innovation and development guidelines for professionals and researchers dealing with offshore pipelines, which are key infrastructures for numerous maritime applications.
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Jas, Eric, Allison Selman, and Valerie Linton. "Out of sight out of mind – subsea pipeline decommissioning." APPEA Journal 57, no. 1 (2017): 79. http://dx.doi.org/10.1071/aj16215.

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Existing legislation, regulation and documentation dealing with decommissioning of offshore oil and gas infrastructure has traditionally been derived from experience gained in the North Sea and the Gulf of Mexico. The Australian operating environments are very different and, consequently, there is no Australian industry-wide engineering standard dedicated to the decommissioning of offshore pipelines. Decommissioning of Australian offshore pipelines is currently handled on a case-by-case basis. The efficiency and effectiveness of any given decommissioning project is variable, and highly dependent upon the experience of the pipeline operator. Given the maturity stage of the Australian offshore oil and gas industry, it is foreseen that in the coming years many operators will approach the task of decommissioning offshore pipelines for the first time. In 2014 the Energy Pipelines Cooperative Research Centre (EPCRC) formed an offshore users group, comprising pipeline experts from several offshore oil and gas operators and engineering consultancies that are members of the Australian Pipelines and Gas Association’s Research and Standards Committee (APGA RSC). This group is developing an engineering guideline for the decommissioning of offshore pipelines. It is being developed in close communication with the Australian Petroleum Production and Exploration Association (APPEA), which has formed a decommissioning committee in relation to offshore facilities. This ensures the guideline is being developed by and with input from a broad spectrum of the Australian offshore oil and gas industry, with the aim of capturing best practice in the Australian context.
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Najafzadeh, Mohammad, Giuseppe Oliveto, and Farshad Saberi-Movahed. "Estimation of Scour Propagation Rates around Pipelines While Considering Simultaneous Effects of Waves and Currents Conditions." Water 14, no. 10 (May 16, 2022): 1589. http://dx.doi.org/10.3390/w14101589.

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Seabed offshore pipelines are widely applied to carry fluid over long distances of the seafloor. The design of offshore pipelines is conducted to bear quite a few environmental loading circumstances in order to provide a well-guarded and reliable fluid transition. Fluid leakage and pipeline vibration due to a failure of the pipeline are the prime causes of accidental catastrophes. Scour phenomena occur around offshore pipelines due to currents and/or wave conditions, consequently causing the susceptibility to pipeline failure. Then, scouring propagation rates require to be studied in three dimensions, namely beneath and normal to the offshore pipeline and the longitudinal direction of itself. In this research, Artificial Intelligent (AI) models are used to derive new regression equations based on the laboratory data for the estimation of 3D scour propagation patterns while seafloor offshore pipelines are exposed to simultaneous impacts of currents and waves. In this way, chiefly based on the experimental investigations conducted by Cheng and colleagues, seven sets of dimensional parameters were given in terms of the Shields’ parameter due to currents and waves, the Keulegan–Carpenter number, the ratio of embedment depth to pipeline diameter, the ratio of orbital velocity to current velocity, and the wave/current angle of attack. Dimensionless parameters were used to provide regression-based equations to evaluate scour propagation rates in three dimensions. The performance of AI models was evaluated by various statistical measures. The model based on our proposed equations performed better than the reported models in the literature. Even more importantly, we indicated that our model inherently has a reliable physical consistency for variations of dimensionless parameters against the scour propagation patterns.
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Xu, Pu, Zhixin Du, and Shunfeng Gong. "Numerical Investigation into Freak Wave Effects on Deepwater Pipeline Installation." Journal of Marine Science and Engineering 8, no. 2 (February 14, 2020): 119. http://dx.doi.org/10.3390/jmse8020119.

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Freak waves are an extreme marine environment factor in offshore structure design and become a potential risk, particularly for laying oil-gas pipelines in deep waters. The objective of this study was to reveal the freak wave effects on dynamic behaviors of offshore pipelines for deepwater installation. Thus, a dedicated finite element model (FEM) for deepwater pipeline installation by the S-lay method was developed with special consideration of freak waves. The FEM also took pipelay vessel motions, pipe–stinger roller interactions, and the cyclic contacts between the pipeline and seabed soil into account. Real vessel and stinger data from an actual engineering project in the South China Sea were collected to obtain an accurate simulation. Moreover, an effective superposition approach of combined transient wave trains and random wave trains was introduced, and various types of freak wave trains were simulated. Extensive numerical analyses of a 12 inch gas pipeline being installed into a water depth of 1500 m were implemented under various freak wave conditions. The noticeable influences of freak waves on the pipeline and seabed responses were identified, which provides significant awareness of offshore pipelines for deepwater installation design and field operation monitoring.
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Herbich, John B. "Hydromechanics of submarine pipelines: design problems." Canadian Journal of Civil Engineering 12, no. 4 (December 1, 1985): 863–74. http://dx.doi.org/10.1139/l85-099.

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In recent years, the size, number, and applications of offshore pipelines have been steadily increasing. The design and construction of pipelines in offshore cold regions calls for special measures (such as deep burial) because of seabed scouring caused by ice.Various societies and associations have pointed out the deficiencies in the state-of-the-art areas of environmental, design, and construction factors, particularly those dealing with structural, external pressure effects, and depth of burial. It has also been recommended that more data be obtained in order to fully evaluate pipeline–soil interaction. Also, field measurements of velocities, accelerations, and forces causing scour around pipelines would greatly enhance our understanding of offshore pipeline behavior.Offshore pipelines fail in many different ways, and each mode of failure should be examined individually. Because of the complexity of the ocean environment it is quite difficult to evaluate pipeline failures in detail.Environmental factors such as hydrodynamic wave forces and currents, buoyancy forces due to liquefaction of sediment, and scouring potential are presented. The dynamics of scour, incipient sediment motion, depth of scour, and scour patterns around pipelines are also reviewed as well as the maximum scour depths as a function of bottom current velocity.Methods for scour protection in shallow and deep water are described as well as the need for inspection and maintenance to prevent failures. Key words: pipelines, offshore, hydrodynamic forces, cover, scour.
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Jujuly, M. M., Mohammad Azizur Rahman, Aaron Maynard, and Matthew Adey. "Hydrate-Induced Vibration in an Offshore Pipeline." SPE Journal 25, no. 02 (December 31, 2019): 732–43. http://dx.doi.org/10.2118/187378-pa.

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Summary Gas-hydrate plugging poses an operational challenge to offshore petroleum production and transportation. In this study, a computational-fluid-dynamics (CFD) model that uses ANSYS Fluent (ANSYS 2019) multiphase-flow-modeling techniques to simulate and analyze the effect of gas-hydrate flow in pipelines is proposed. For this purpose, the study attempted to integrate the ANSYS Fluent model with an existing commercial subsea-pipeline-visualization tool. To validate the simulation results, two case studies were conducted. The first study was about a pipeline whose dimensions are based on the specifications in existing literature (Balakin et al. 2010a). The second study was about a pipeline with more-complex geometry (M-shaped jumper with six elbows). The Eulerian/Eulerian method was used to model the multiphase hydrate flow. The population-balance method (PBM) was then used to model hydrate agglomeration and its breakup mechanism in the flow. A parametric study of the stresses in the pipelines resulting from flow-induced vibration (FIV) was conducted to identify the regions that underwent the maximum stresses and deformations under various flow conditions. The tool can be used in the petroleum industry to identify the operational hazards in offshore structures and to take necessary safety measures to avoid any potential catastrophic events.
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Song, Shangfei, Di Fan, Yijia Fan, Bing Yan, Bohui Shi, Shengnan Zhang, Xiaofang Lv, Haiyuan Yao, Qingping Li, and Jing Gong. "Research on transient composition tracking in natural gas condensate pipeline networks." Physics of Fluids 35, no. 2 (February 2023): 026102. http://dx.doi.org/10.1063/5.0138237.

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Offshore pipelines are hailed as the “lifeline” of an offshore oil and gas production system and are essential for offshore oil and gas development. Component tracing technologies for the oil and gas multiphase transmission pipeline networks need to be urgently developed to predict the fluid composition changes in pipeline networks. Instead of assuming the fluid components are constant, we consider they varied with flow. The component conservation equations and a phase change model are established. The equation of state of the fluid is adopted to determine the equilibrium state of each component in real time. Considering the macroscopic flow calculation, microscopic fluid components, and phase equilibrium, the component tracking algorithm is established for natural gas condensate pipeline networks, which can dynamically track the fluid composition in pipeline networks and calculate the phase exchange amount and related flow parameters in real time. Three case studies are performed to verify the effectiveness of the algorithm. These findings are of great practical significance for understanding the gas–liquid two-phase flow in pipeline networks, promoting further engineering applications of component tracking on pipeline networks.
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Dissertations / Theses on the topic "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/.

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This research has reviewed the current status of offshore and marine safety. The major problems identified in the research are associated with risk modelling under circumstances where the lack of data or high level of uncertainty exists. This PhD research adopts an object-oriented approach, a natural and straightforward mechanism 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 assessment is to evaluate the risk levels of components, subsystems, and the overall OGSS. Fault trees are then used to represent the cause-effect relationships for a specific risk in the system. Use of these two assessment frameworks can help decision makers to obtain comprehensive view of risks in the OGSS. In order to quantitatively evaluate the framework of aggregative risk, this thesis uses a fuzzy aggregative risk assessment method to determine the risk levels associated with components, subsystems, and the overall OGSS. The fuzzy aggregative risk assessment method is tailored to quantify the risk levels of components, subsystems, and the OGSS. The proposed method is able to identify the most critical subsystem in the OGSS. As soon as, the most critical subsystem is identified, Fuzzy Fault Tree Analysis (FFTA) is employed to quantitatively evaluate the cause-effect relationships for specific undesired event. These results can help risk analysts to select Risk Control Options (RCOs) for mitigating risks in an OGSS. It is not financially possible to employ all the selected RCOs. Therefore, it is necessary to rank and select the best RCO. A decision making method using the Fuzzy TOPSIS (FTOPSIS) is proposed to demonstrate the selection of the best RCOs to control the existing risks in the system. The developed models and frameworks can be integrated to formulate a platform which enables to facilitate risk assessment and safety management of OGSSs without jeopardising the efficiency of OGSSs operations in various situations where traditional risk assessment and safety management techniques cannot be effectively applied.
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Snyman, 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.

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Bibliography: pages 81-85.
This 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.
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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.

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Laricchia, Francesco. "Study of offshore flexible pipelines with analytical and numerical methods." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2020.

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The work outlined presents three different analytical approaches for analyze a flexible pipelines, combined in one unified formulation. Additionally, a finite element model of an unbonded flexible riser is presented. Are reported results and discussion about a flexible pipeline subjected to a tensional load and internal pressure and focus on Axial tension-elongation curves under different lay angles of helical tendons.
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Givan, Daniel Rey. "Improved operational limits for offshore pipelay vessels." ScholarWorks@UNO, 2012. http://scholarworks.uno.edu/td/1439.

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Subsea pipelines are used extensively throughout the world’s oceans to transport oil and gas from offshore facilities to land, often hundreds of miles. These pipelines range in diameter from three to sixty inches and are installed in deeper depths every year, currently as deep as 2,900 meters. Pipeline construction and installation costs are a large percentage of offshore projects and thus, methods toward reducing costs is an imperative objective. With pipeline installation projects taking place in harsher environments, vessel operability is vital. This work presents an improved method for determining limiting criteria for pipelay operations to more effectively plan and execute offshore projects. This improvement is based on the consideration of total effective pipeline stresses as the limiting criterion rather than the traditionally used limiting pitch angle. Limiting sea curves based on a sample dynamic pipeline analysis are shown and their incorporation in workability planning is discussed.
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Bakouros, 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.

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Paskin, 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.

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Aris-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.

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Cette étude porte sur la caractérisation des matériaux constituant le revêtement isolant de pipeline offshore ainsi que la soudure réalisée entre les deux polymères semi-cristallins du revêtement au niveau de la jonction entre deux tubes successifs.L’épaisseur très importante du revêtement induit, au cours du procédé de soudage, des vitesses hétérogènes de chauffe et de refroidissement des matériaux. Ces dernières ont été caractérisées grâce à une instrumentation du procédé en site industriel. Une modélisation numérique intégrant les phases successives du procédé est en bon accord avec les résultats expérimentaux. Cette modélisation permet de dresser une cartographie complète des champs de température dans l’ensemble du pipeline et plus précisément dans la zone de soudage.Cette étude nous a amené à réaliser une caractérisation des deux matériaux soudés au cours de leurs fusions et cristallisations qui représentent deux étapes cruciales lors du soudage. Une attention particulière a été portée au comportement rhéologique dans la zone de transition entre l’état fondu et l’état solide et inversement. Les données en refroidissement à différentes vitesses ont été corrélées avec le taux de transformation des matériaux.Les propriétés mécaniques des isolants ont été testées ainsi que celles des soudures en prélevant des éprouvettes sur les essais effectués en site industriel. Le peu de flexibilité du procédé industriel rend difficile une investigation de l’influence des paramètres de soudage. Une expérience « image », représentative des grandeurs industrielles, a donc été développée à l’échelle du laboratoire permettant de faire varier les paramètres de soudage. Il a été montré que le point de faiblesse de l’assemblage ne se situe pas au niveau de la soudure mais dans l’un des matériaux du revêtement
This 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
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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.

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Ice features present one of the major obstacles to offshore development in the Arctic and Atlantic regions of Canada. Ice features have been observed to interact with the see floor creating scour features (Clark et al., 1986). In particular, when an ice feature is driven by environmental forces into the shallow water, ice scouring of the seabed may cause a danger to bottom installations such as submarine pipelines. In the present study, the ice-scour event in a centrifuge test is simulated by using PLAXIS and ADINA finite element programs. The centrifuge test data reported by (Lach et al., 1993; Yang and Poorooshasb, 1997) and the input data in their numerical study are utilized in the present work. In numerical analysis, geometric and material nonlinearities are considered. Two dimensional and three dimensional finite element models are used to calculate the stresses and deformations in the seabed soils, the deflections of the pipe, and the stresses acting on the pipe. In order to establish the validity of the finite element calculations, the experimental results and the numerical results are compared. The importance of using interface elements between the soil and the ice feature is also investigated. The FE predictions are reasonably close to the centrifuge test data. The displacements of the pipe in 3-D model are smaller than those predicted by 2-D model due to the three dimensional effects. Bending and torsion of the pipe along its long axis can only be calculated in 3-D FE analysis. Using the interface elements in the numerical analysis helps to obtain a better agreement between the calculated and measured values. In addition, convergence problems are reduced.
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Shabani, Behnam. "Wave-Associated Seabed Behaviour near Submarine Buried Pipelines." Thesis, The University of Sydney, 2008. http://hdl.handle.net/2123/3532.

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Soil 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.
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Books on the topic "Offshore Pipeline"

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Woodson, Ross D. Offshore pipeline failures. Springfield, Va: Available from the National Technical Information Service, 1990.

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Slater, G. Offshore pipeline girth welds: MIG database. London: HMSO, 1988.

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Mudge, P. J. Offshore pipeline girth welds: Non-destructive testing. London: H.M.S.O., 1989.

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Slater, G. Offshore pipeline girth welds: Vertical-up weld metal database. London: HMSO, 1988.

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National Association of Corrosion Engineers. Metallurgical and inspection requirements for offshore pipeline bracelet anodes. Houston: NACE, 1992.

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Deepwater foundations and pipeline geomechanics. Ft. Lauderdale, FL: J. Ross Pub., 2011.

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United States. Minerals Management Service. Gulf of Mexico OCS Region. Investigation of Shell Offshore Inc. Hobbit pipeline leak, Ship Shoal block 281, January 24, 1990: Gulf of Mexico, offshore Louisiana. [New Orleans, La.]: U.S. Dept. of the Interior, Minerals Management Service, Gulf of Mexico OCS Regional Office, 1991.

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Shipping, American Bureau of. Guide for building and classing undersea pipeline systems and risers. Paramus, N.J., U.S.A. (P.O. Box 910, Paramus 07653-0910): American Bureau of Shipping, 1991.

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Hart, P. H. M. Offshore pipeline girth welds: The factors influencing mechanised MIG weld metal toughness. London: HMSO, 1988.

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Carne, M. M. P. The integrity of offshore pipeline girth welds: The influence of hydrogen on the fracture toughness of cellulosic coated electrode weld deposits. London: HMSO, 1988.

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Book chapters on the topic "Offshore Pipeline"

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Laik, Sukumar. "Offshore Pipeline." In Offshore Petroleum Drilling and Production, 483–528. Boca Raton : Taylor & Francis, a CRC title, part of the Taylor & Francis imprint, a member of the Taylor & Francis Group, the academic division of T&F Informa, plc, [2018]: CRC Press, 2018. http://dx.doi.org/10.1201/9781315157177-8.

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Hovland, Martin. "Marine Life Associated with Offshore Drilling offshore drilling , Pipelines pipeline , and Platforms platforms." In Encyclopedia of Sustainability Science and Technology, 6404–25. New York, NY: Springer New York, 2012. http://dx.doi.org/10.1007/978-1-4419-0851-3_478.

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Singh, Binder, and Ben Poblete. "Offshore Pipeline Risk, Corrosion, and Integrity Management." In Oil and Gas Pipelines, 727–58. Hoboken, New Jersey: John Wiley & Sons, Inc., 2015. http://dx.doi.org/10.1002/9781119019213.ch49.

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Braathen, N. F., and A. J. Sandford. "Pipeline Inspection by ROV." In Advances in Underwater Technology, Ocean Science and Offshore Engineering, 313–18. Dordrecht: Springer Netherlands, 1986. http://dx.doi.org/10.1007/978-94-009-4203-5_36.

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O'grady, Robert. "The Effect of Installation on Offshore Pipeline Integrity." In Oil and Gas Pipelines, 253–64. Hoboken, New Jersey: John Wiley & Sons, Inc., 2015. http://dx.doi.org/10.1002/9781119019213.ch19.

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Bouazza, A., and T. W. Finlay. "Behaviour of Anchor Reinforcement in Offshore Pipelines." In Advances in Subsea Pipeline Engineering and Technology, 67–76. Dordrecht: Springer Netherlands, 1990. http://dx.doi.org/10.1007/978-94-009-0617-4_4.

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Sarkar, Goutam, and Pronab Roy. "Influence of Seabed Soil Characteristics on Eigenfrequency of Offshore Free Spanning Pipeline." In Advances in Offshore Geotechnics, 347–60. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-6832-9_20.

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Melchers, Robert E. "Extreme Value Analysis for Offshore Pipeline Risk Estimation." In Springer Tracts in Civil Engineering, 355–71. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-85018-0_17.

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Aldeen, A. "Technological Advances in Pipeline Isolation and Repair." In Advances in Underwater Technology, Ocean Science and Offshore Engineering, 207–23. Dordrecht: Springer Netherlands, 1994. http://dx.doi.org/10.1007/978-94-011-1178-2_12.

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"offshore pipeline." In Dictionary Geotechnical Engineering/Wörterbuch GeoTechnik, 928. Berlin, Heidelberg: Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-642-41714-6_150236.

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Conference papers on the topic "Offshore Pipeline"

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Mabily, Daniel, and Virginie Lehning. "Pipeline Leak and Impact Detection System - PipeLIDS - Monitoring Product Dedicated to Onshore Pipelines." In Offshore Technology Conference. Offshore Technology Conference, 2016. http://dx.doi.org/10.4043/27026-ms.

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Dansette, Nicholas, and N. C. Robertson. "Subsea Flexible Pipeline Burial Using A Lightweight Pipeline Trencher." In Offshore Technology Conference. Offshore Technology Conference, 1994. http://dx.doi.org/10.4043/7600-ms.

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Wincheski, Rick, Craig Bertrand, Brent Dampman, and Danny Eisenhauer. "Brutus Export Pipelines - Improvement Opportunities and Challenges in Deepwater Pipeline Installation." In Offshore Technology Conference. Offshore Technology Conference, 2002. http://dx.doi.org/10.4043/13994-ms.

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Brown, Trent S., Paul Jukes, and Jason Sun. "SS: Cryogenic Pipeline-Mechanical Design of Subsea and Buried LNG Pipelines." In Offshore Technology Conference. Offshore Technology Conference, 2009. http://dx.doi.org/10.4043/20226-ms.

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McClure, Lawrence C., and Mark A. J. Dixon. "Optimized Pipeline Routing." In Offshore Technology Conference. Offshore Technology Conference, 2008. http://dx.doi.org/10.4043/19521-ms.

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Bhowmik, Subrata. "Machine Learning-Based Optimization for Subsea Pipeline Route Design." In Offshore Technology Conference. OTC, 2021. http://dx.doi.org/10.4043/31031-ms.

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Abstract Optimal route selection for the subsea pipeline is a critical task for the pipeline design process, and the route selected can significantly affect the overall project cost. Therefore, it is necessary to design the routes to be economical and safe. On-bottom stability (OBS) and fixed obstacles like existing crossings and free spans are the main factors that affect the route selection. This article proposes a novel hybrid optimization method based on a typical Machine Learning algorithm for designing an optimal pipeline route. The proposed optimal route design is compared with one of the popular multi-objective optimization method named Genetic Algorithm (GA). The proposed pipeline route selection method uses a Reinforcement Learning (RL) algorithm, a particular type of machine learning method to train a pipeline system that would optimize the route selection of subsea pipelines. The route optimization tool evaluates each possible route by incorporating Onbottom stability criteria based on DNVGL-ST-109 standard and other constraints such as the minimum pipeline route length, static obstacles, pipeline crossings, and free-span section length. The cost function in the optimization method simultaneously handles the minimization of length and cost of mitigating procedures. Genetic Algorithm, a well established optimization method, has been used as a reference to compare the optimal route with the result from the proposed Reinforcement Learning based optimization method. Three different case studies are performed for finding the optimal route selection using the Reinforcement Learning (RL) approach considering the OBS criteria into its cost function and compared with the Genetic Algorithm (GA). The RL method saves upto 20% pipeline length for a complex problem with 15 crossings and 31 free spans. The RL optimization method provides the optimal routes, considering different aspects of the design and the costs associated with the various factors to stabilize a pipeline (mattress, trenching, burying, concrete coating, or even employing a more massive pipe with additional steel wall thickness). OBS criteria significantly influence the best route, indicating that the tool can reduce the pipeline's design time and minimize installation and operational costs of the pipeline. Conventionally the pipeline route optimization is performed by a manual process where the minimum roule length and static obstacles are considered to find an optimum route. The engineering is then performed to fulfill the criteria of this route, and this approach may not lead to an optimized engineering cost. The proposed Reinforced Learning method for route optimization is a mixed type, faster, and cost-efficient approach. It significantly minimizes the pipeline's installation and operational costs up to 20% of the conventional route selection process.
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Istre, Michael R. "Pipeline End-Sled Design for the Green Canyon 209 Lateral Pipeline." In Offshore Technology Conference. Offshore Technology Conference, 2001. http://dx.doi.org/10.4043/13260-ms.

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Aljaroudi, Alireda, Premkumar Thodi, Ayhan Akinturk, Faisal Khan, and Mike Paulin. "Application of Probabilistic Methods for Predicting the Remaining Life of Offshore Pipelines." In 2014 10th International Pipeline Conference. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/ipc2014-33431.

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When offshore pipelines are approaching the end of their design life or have gone beyond their design life, their condition could possibly threaten oil flow continuity (through leak or rupture) as well as become a potential safety or environmental hazard. Some of the pipelines may show signs of deterioration and ageing due to corrosion, cracking or other damage mechanisms. Any assets, such as the pipeline, may be desired to continue transporting hydrocarbons beyond its design life due to increased oil and gas demand, due to unforeseen increased oil and gas reserves, or due to upgrade where additional assets are tied-into the existing pipeline system. Other situations may force operators to maintain the pipeline’s design life in spite of premature ageing of the pipe wall caused by the increased corrosion growth or other anomalies. Hence, there may be a need to assess the remaining life of pipeline in order to determine if it is capable of coping with current and future operational demand. The first task in the assessment process is to identify degradation mechanisms and their rate of growth, then estimate uncertainties in the collected data concerning pipeline flaw geometry, pipeline mechanical properties and operating characteristics. Based on the collected data and the assessment, the probability and consequence of failure can be determined. The remaining life of a pipeline is the time it takes the pipeline to fail or exceed the target failure probability. This paper presents a methodology for assessing the condition of ageing pipelines and determining the remaining life that supports extended operation without compromising safety and reliability. Applying this methodology would facilitate a well-informed decision that enables decision makers to determine the best strategy or adequate course of action for assessing and maintaining the integrity of ageing pipelines.
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Adams, G. P., G. D. Grass, and J. A. Gilmore. "Bombax Pipeline Project Overview." In Offshore Technology Conference. Offshore Technology Conference, 2003. http://dx.doi.org/10.4043/15270-ms.

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Teale, R. A. "Deepwater Pipeline Welding Specifications." In Offshore Technology Conference. Offshore Technology Conference, 1986. http://dx.doi.org/10.4043/5349-ms.

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Reports on the topic "Offshore Pipeline"

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Machiels, Marcel. Fishing activity near offshore pipelines, 2017. IJmuiden: Wageningen Marine Research, 2018. http://dx.doi.org/10.18174/443945.

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Hintzen, Niels. Fishing activity near Wintershall offshore pipelines. IJmuiden: Wageningen Marine Research, 2019. http://dx.doi.org/10.18174/496892.

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Hintzen, Niels. Fishing activity near Petrogas offshore pipelines, 2020. Haarlem: Wageningen Marine Research, 2021. http://dx.doi.org/10.18174/549049.

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Hintzen, Niels. Fishing activity near offshore pipelines, 2017-2021. IJmuiden: Wageningen Marine Research, 2022. http://dx.doi.org/10.18174/575207.

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Economic impacts of oil spills: Spill unit costs for tankers, pipelines, refineries, and offshore facilities. [Task 1, Final report]. Office of Scientific and Technical Information (OSTI), October 1993. http://dx.doi.org/10.2172/10186611.

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