The Experts below are selected from a list of 132 Experts worldwide ranked by ideXlab platform

Giannoula Chatzopoulou - One of the best experts on this subject based on the ideXlab platform.

  • Numerical Simulation of JCO-E Pipe Manufacturing Process and Its Effect on the External Pressure Capacity of the Pipe
    Journal of Offshore Mechanics and Arctic Engineering-transactions of The Asme, 2018
    Co-Authors: Konstantinos Antoniou, Giannoula Chatzopoulou, Spyros A. Karamanos, Athanasios Tazedakis, Christos Palagas, Efthimios Dourdounis
    Abstract:

    Large-diameter thick-walled steel Pipes during their installation in deep-water are subjected to external pressure, which may trigger structural instability due to Pipe ovalization, with detrimental effects. The resistance of offshore Pipes against this instability is affected by local geometric deviations and residual stresses, introduced by the line Pipe Manufacturing Process. In the present paper, the JCO-E Pipe Manufacturing Process, a commonly adopted Process for producing large-diameter Pipes of significant thickness, is examined. The study examines the effect of JCO-E line Pipe Manufacturing Process on the external pressure resistance of offshore Pipes, candidates for deepwater applications using nonlinear finite element simulation tools. The cold bending induced by the JCO forming Process as well as the subsequent welding and expansion (E) operations are simulated rigorously. Subsequently, the application of external pressure is modeled until structural instability (collapse) is detected. Both the JCO-E Manufacturing Process and the external pressure response of the Pipe, are modeled using a two-dimensional (2D) generalized plane strain model, together with a coupled thermo-mechanical model for simulating the welding Process.

  • Numerical Simulation of JCO Pipe Forming Process and its Effect on the External Pressure Capacity of the Pipe
    Volume 5B: Pipelines Risers and Subsea Systems, 2017
    Co-Authors: Giannoula Chatzopoulou, Konstantinos Antoniou, Spyros A. Karamanos
    Abstract:

    Large-diameter thick-walled steel Pipes during their installation in deep-water are subjected to external pressure, which may trigger structural instability due to excessive Pipe ovalization with catastrophic effects. The resistance of offshore Pipes against this instability mode strongly depends on imperfections and residual stresses introduced by the line Pipe Manufacturing Process. In the present paper, the JCO Pipe Manufacturing Process, a commonly adopted Process for producing large-diameter Pipes of significant thickness, is examined. The study examines the effect of JCO line Pipe Manufacturing Process on the structural response and resistance of offshore Pipes during the installation Process using nonlinear finite element simulation tools. At first, the cold bending induced by the JCO Process is simulated rigorously, and subsequently, the application of external pressure is modeled until structural instability is detected. For the simulation of the JCO Manufacturing Process and the structured response of the Pipe a two dimensional generalized plane strain model is used. Furthermore, a numerical analysis is also conducted on the effects of line Pipe expansion on the structural capacity of the JCO Pipe.

  • Finite element analysis of UOE Manufacturing Process and its effect on mechanical behavior of offshore Pipes
    International Journal of Solids and Structures, 2016
    Co-Authors: Giannoula Chatzopoulou, Spyros A. Karamanos, George E. Varelis
    Abstract:

    Abstract Thick-walled steel Pipes during their installation in deep-water are subjected to a combination of loading in terms of external pressure, bending and axial tension, which may trigger structural instability due to excessive Pipe ovalization. The resistance of offshore Pipes against this instability depends on imperfections and residual stresses due to the line Pipe Manufacturing Process. The present study examines the effect of UOE line Pipe Manufacturing Process on the structural response and resistance of offshore Pipes during the installation Process using advanced finite element simulation tools. The cold bending induced by the UOE Process is simulated rigorously and, subsequently, the application of external pressure and structural loading (bending or axial force) is modeled, until structural instability is reached. A parametric analysis is conducted, focusing on the effects of line Pipe expansion on the structural capacity of the Pipe. The results show that there exists an optimum expansion at which the highest pressure capacity is achieved. The effect of the axial tension on the pressure capacity of the Pipe is examined as well. The influence of the line Pipe expansion on bending capacity in the presence of external pressure is also identified. Finally, a simplified methodology is employed, accounting for the material anisotropy induced by the Manufacturing Process, capable of determining the structural capacity of a UOE Pipe in a simple and efficient manner with good accuracy, using more conventional modeling tools.

  • Numerical Simulation of UOE Pipe Process and its Effect on Pipe Mechanical Behavior in Deep-Water Applications
    Volume 5B: Pipeline and Riser Technology, 2015
    Co-Authors: Giannoula Chatzopoulou, Spyros A. Karamanos, George E. Varelis
    Abstract:

    Large-diameter thick-walled steel Pipes during their installation in deep-water are subjected to a combination of loading in terms of external pressure, bending and axial tension, which may trigger structural instability due to excessive Pipe ovalization with catastrophic effects. In the present study, the UOE Pipe Manufacturing Process, commonly adopted for producing large-diameter Pipes of significant thickness, is considered. The study examines the effect of UOE line Pipe Manufacturing Process on the structural response and resistance of offshore Pipes during the installation Process using nonlinear finite element simulation tools.Copyright © 2015 by ASME

  • Effects of UOE Manufacturing Process on Pressurized Bending Response of Offshore Pipes
    Volume 3: Materials and Joining; Risk and Reliability, 2014
    Co-Authors: Giannoula Chatzopoulou, Spyros A. Karamanos, George E. Varelis
    Abstract:

    Thick-walled steel Pipes manufactured through the UOE Process are used in deep-water Pipeline applications for the safe and cost-effective transmission of hydrocarbon energy resources. Such Pipes are subjected to bending loads in the presence of high external pressure during their installation stage. The combination of bending and external pressure often triggers the development of structural instability due to excessive ovalization of the Pipe with catastrophic effects. In the present study, the effect of UOE line Pipe Manufacturing Process on the bending response of externally-pressurized thick-walled Pipes is examined, using finite element simulation tools.Copyright © 2014 by ASME

Spyros A. Karamanos - One of the best experts on this subject based on the ideXlab platform.

  • Numerical Simulation of JCO-E Pipe Manufacturing Process and Its Effect on the External Pressure Capacity of the Pipe
    Journal of Offshore Mechanics and Arctic Engineering-transactions of The Asme, 2018
    Co-Authors: Konstantinos Antoniou, Giannoula Chatzopoulou, Spyros A. Karamanos, Athanasios Tazedakis, Christos Palagas, Efthimios Dourdounis
    Abstract:

    Large-diameter thick-walled steel Pipes during their installation in deep-water are subjected to external pressure, which may trigger structural instability due to Pipe ovalization, with detrimental effects. The resistance of offshore Pipes against this instability is affected by local geometric deviations and residual stresses, introduced by the line Pipe Manufacturing Process. In the present paper, the JCO-E Pipe Manufacturing Process, a commonly adopted Process for producing large-diameter Pipes of significant thickness, is examined. The study examines the effect of JCO-E line Pipe Manufacturing Process on the external pressure resistance of offshore Pipes, candidates for deepwater applications using nonlinear finite element simulation tools. The cold bending induced by the JCO forming Process as well as the subsequent welding and expansion (E) operations are simulated rigorously. Subsequently, the application of external pressure is modeled until structural instability (collapse) is detected. Both the JCO-E Manufacturing Process and the external pressure response of the Pipe, are modeled using a two-dimensional (2D) generalized plane strain model, together with a coupled thermo-mechanical model for simulating the welding Process.

  • Numerical Simulation of JCO Pipe Forming Process and its Effect on the External Pressure Capacity of the Pipe
    Volume 5B: Pipelines Risers and Subsea Systems, 2017
    Co-Authors: Giannoula Chatzopoulou, Konstantinos Antoniou, Spyros A. Karamanos
    Abstract:

    Large-diameter thick-walled steel Pipes during their installation in deep-water are subjected to external pressure, which may trigger structural instability due to excessive Pipe ovalization with catastrophic effects. The resistance of offshore Pipes against this instability mode strongly depends on imperfections and residual stresses introduced by the line Pipe Manufacturing Process. In the present paper, the JCO Pipe Manufacturing Process, a commonly adopted Process for producing large-diameter Pipes of significant thickness, is examined. The study examines the effect of JCO line Pipe Manufacturing Process on the structural response and resistance of offshore Pipes during the installation Process using nonlinear finite element simulation tools. At first, the cold bending induced by the JCO Process is simulated rigorously, and subsequently, the application of external pressure is modeled until structural instability is detected. For the simulation of the JCO Manufacturing Process and the structured response of the Pipe a two dimensional generalized plane strain model is used. Furthermore, a numerical analysis is also conducted on the effects of line Pipe expansion on the structural capacity of the JCO Pipe.

  • Finite element analysis of UOE Manufacturing Process and its effect on mechanical behavior of offshore Pipes
    International Journal of Solids and Structures, 2016
    Co-Authors: Giannoula Chatzopoulou, Spyros A. Karamanos, George E. Varelis
    Abstract:

    Abstract Thick-walled steel Pipes during their installation in deep-water are subjected to a combination of loading in terms of external pressure, bending and axial tension, which may trigger structural instability due to excessive Pipe ovalization. The resistance of offshore Pipes against this instability depends on imperfections and residual stresses due to the line Pipe Manufacturing Process. The present study examines the effect of UOE line Pipe Manufacturing Process on the structural response and resistance of offshore Pipes during the installation Process using advanced finite element simulation tools. The cold bending induced by the UOE Process is simulated rigorously and, subsequently, the application of external pressure and structural loading (bending or axial force) is modeled, until structural instability is reached. A parametric analysis is conducted, focusing on the effects of line Pipe expansion on the structural capacity of the Pipe. The results show that there exists an optimum expansion at which the highest pressure capacity is achieved. The effect of the axial tension on the pressure capacity of the Pipe is examined as well. The influence of the line Pipe expansion on bending capacity in the presence of external pressure is also identified. Finally, a simplified methodology is employed, accounting for the material anisotropy induced by the Manufacturing Process, capable of determining the structural capacity of a UOE Pipe in a simple and efficient manner with good accuracy, using more conventional modeling tools.

  • Numerical Simulation of UOE Pipe Process and its Effect on Pipe Mechanical Behavior in Deep-Water Applications
    Volume 5B: Pipeline and Riser Technology, 2015
    Co-Authors: Giannoula Chatzopoulou, Spyros A. Karamanos, George E. Varelis
    Abstract:

    Large-diameter thick-walled steel Pipes during their installation in deep-water are subjected to a combination of loading in terms of external pressure, bending and axial tension, which may trigger structural instability due to excessive Pipe ovalization with catastrophic effects. In the present study, the UOE Pipe Manufacturing Process, commonly adopted for producing large-diameter Pipes of significant thickness, is considered. The study examines the effect of UOE line Pipe Manufacturing Process on the structural response and resistance of offshore Pipes during the installation Process using nonlinear finite element simulation tools.Copyright © 2015 by ASME

  • Effects of UOE Manufacturing Process on Pressurized Bending Response of Offshore Pipes
    Volume 3: Materials and Joining; Risk and Reliability, 2014
    Co-Authors: Giannoula Chatzopoulou, Spyros A. Karamanos, George E. Varelis
    Abstract:

    Thick-walled steel Pipes manufactured through the UOE Process are used in deep-water Pipeline applications for the safe and cost-effective transmission of hydrocarbon energy resources. Such Pipes are subjected to bending loads in the presence of high external pressure during their installation stage. The combination of bending and external pressure often triggers the development of structural instability due to excessive ovalization of the Pipe with catastrophic effects. In the present study, the effect of UOE line Pipe Manufacturing Process on the bending response of externally-pressurized thick-walled Pipes is examined, using finite element simulation tools.Copyright © 2014 by ASME

George E. Varelis - One of the best experts on this subject based on the ideXlab platform.

  • Finite element analysis of UOE Manufacturing Process and its effect on mechanical behavior of offshore Pipes
    International Journal of Solids and Structures, 2016
    Co-Authors: Giannoula Chatzopoulou, Spyros A. Karamanos, George E. Varelis
    Abstract:

    Abstract Thick-walled steel Pipes during their installation in deep-water are subjected to a combination of loading in terms of external pressure, bending and axial tension, which may trigger structural instability due to excessive Pipe ovalization. The resistance of offshore Pipes against this instability depends on imperfections and residual stresses due to the line Pipe Manufacturing Process. The present study examines the effect of UOE line Pipe Manufacturing Process on the structural response and resistance of offshore Pipes during the installation Process using advanced finite element simulation tools. The cold bending induced by the UOE Process is simulated rigorously and, subsequently, the application of external pressure and structural loading (bending or axial force) is modeled, until structural instability is reached. A parametric analysis is conducted, focusing on the effects of line Pipe expansion on the structural capacity of the Pipe. The results show that there exists an optimum expansion at which the highest pressure capacity is achieved. The effect of the axial tension on the pressure capacity of the Pipe is examined as well. The influence of the line Pipe expansion on bending capacity in the presence of external pressure is also identified. Finally, a simplified methodology is employed, accounting for the material anisotropy induced by the Manufacturing Process, capable of determining the structural capacity of a UOE Pipe in a simple and efficient manner with good accuracy, using more conventional modeling tools.

  • Numerical Simulation of UOE Pipe Process and its Effect on Pipe Mechanical Behavior in Deep-Water Applications
    Volume 5B: Pipeline and Riser Technology, 2015
    Co-Authors: Giannoula Chatzopoulou, Spyros A. Karamanos, George E. Varelis
    Abstract:

    Large-diameter thick-walled steel Pipes during their installation in deep-water are subjected to a combination of loading in terms of external pressure, bending and axial tension, which may trigger structural instability due to excessive Pipe ovalization with catastrophic effects. In the present study, the UOE Pipe Manufacturing Process, commonly adopted for producing large-diameter Pipes of significant thickness, is considered. The study examines the effect of UOE line Pipe Manufacturing Process on the structural response and resistance of offshore Pipes during the installation Process using nonlinear finite element simulation tools.Copyright © 2015 by ASME

  • Effects of UOE Manufacturing Process on Pressurized Bending Response of Offshore Pipes
    Volume 3: Materials and Joining; Risk and Reliability, 2014
    Co-Authors: Giannoula Chatzopoulou, Spyros A. Karamanos, George E. Varelis
    Abstract:

    Thick-walled steel Pipes manufactured through the UOE Process are used in deep-water Pipeline applications for the safe and cost-effective transmission of hydrocarbon energy resources. Such Pipes are subjected to bending loads in the presence of high external pressure during their installation stage. The combination of bending and external pressure often triggers the development of structural instability due to excessive ovalization of the Pipe with catastrophic effects. In the present study, the effect of UOE line Pipe Manufacturing Process on the bending response of externally-pressurized thick-walled Pipes is examined, using finite element simulation tools.Copyright © 2014 by ASME

Mihael Chirchor - One of the best experts on this subject based on the ideXlab platform.

  • UOE Pipe Manufacturing Process Simulation: Equipment Designing and Construction
    ACTA Universitatis Cibiniensis, 2017
    Co-Authors: Dmitri Delistoian, Mihael Chirchor
    Abstract:

    Abstract UOE Pipe Manufacturing Process influence directly on Pipeline resilience and operation capacity. At present most spreaded Pipe Manufacturing method is UOE. This method is based on cold forming. After each technological step appears a certain stress and strain level. For Pipe stress strain study is designed and constructed special equipment that simulate entire technological Process.UOE Pipe equipment is dedicated for Manufacturing of longitudinally submerged arc welded DN 400 (16 inch) steel Pipe.

  • UOE Pipe Numerical Model: Manufacturing Process And Von Mises Residual Stresses Resulted After Each Technological Step
    ACTA Universitatis Cibiniensis, 2017
    Co-Authors: Dmitri Delistoian, Mihael Chirchor
    Abstract:

    Abstract Fluid transportation from production areas to final customer is effectuated by Pipelines. For oil and gas industry, Pipeline safety and reliability represents a priority. From this reason, Pipe quality guarantee directly influence Pipeline designed life, but first of all protects environment. A significant number of longitudinally welded Pipes, for onshore/offshore Pipelines, are manufactured by UOE method. This method is based on cold forming. In present study, using finite element method is modeled UOE Pipe Manufacturing Process and is obtained von Mises stresses for each step. Numerical simulation is performed for L415 MB (X60) steel plate with 7,9 mm thickness, length 30 mm and width 1250mm, as result it is obtained a DN 400 Pipe.

Luis C. Chad - One of the best experts on this subject based on the ideXlab platform.

  • The Influence of the UOE-SAWL Forming Process on the Collapse Resistance of Deepwater LinePipe
    Volume 4: Pipeline and Riser Technology, 2011
    Co-Authors: Luciano Mantovano, Chris Timms, Mohamed R. Chebaro, Hugo A. Ernst, Marcos De Souza, Luis C. Chad
    Abstract:

    The UOE-SAWL Pipe Manufacturing Process introduces considerable plastic deformations and residual stresses to feedstock plate material. Previous experimental and analytical studies have demonstrated that the effects of this Process, predominantly in its final expansion stage, significantly reduce the collapse resistance of deepwater linePipe. Finite element analyses, sensitivity analyses and full-scale tests were conducted by Tenaris and C-FER Technologies (C-FER) over the last several years to better comprehend the impact of cold forming on collapse resistance. This paper presents the findings of the latest segment of this ongoing study, the objective of which was to optimize the collapse resistance of UOE-SAWL linePipe by varying three key thermal ageing parameters: time, temperature and number of thermal cycles. Six X70M and four X80M UOE Pipe samples were manufactured and thermally treated with varied parameters. Full-scale collapse and buckle propagation tests were then carried out in an experimental chamber that simulates deepwater conditions. These experimental results were evaluated with respect to collapse predictions from API RP 1111 and DNV OS-F101. Material and ring splitting tests were also performed on samples obtained from these Pipes to better assess the extent of the UOE Pipe collapse resistance recovery. The outcomes of this study will be employed to further optimize the collapse resistance of subsea linePipe in order to reduce material and offshore installation costs.Copyright © 2011 by ASME

  • THE INFLUENCE OF THE UOE FORMING Process ON MATERIAL PROPERTIES AND COLLAPSE OF DEEPWATER LINEPipe
    Volume 3: Pipeline and Riser Technology, 2009
    Co-Authors: Chris Timms, Rita G. Toscano, Luciano Mantovano, Hugo A. Ernst, Marcos De Souza, Duane Degeer, Doug Swanek, Luis C. Chad
    Abstract:

    It has been demonstrated in previous work that, for deepwater applications, the cold forming Process involved in UOE Pipe Manufacturing significantly reduces Pipe collapse strength. To improve the understanding of these effects, Tenaris has embarked on a program to model the stages of the UOE Manufacturing Process using finite element methods. Previous phases of this work formulated the basis for model development and described the 2D approach taken to model the various stages of manufacture. More recent developments included some modeling enhancements, sensitivity analyses, and comparison of predictions to the results of full-scale collapse testing performed at C-FER. This work has shown correlations between Manufacturing parameters and collapse pressure predictions. The results of the latest phase of the research program are presented in this paper. This work consists of full-scale collapse testing and extensive coupon testing on samples collected from various stages of the UOE Pipe Manufacturing Process including plate, UO, UOE, and thermally-aged UOE. Four UOE Pipe samples manufactured with varying forming parameters were provided by Tenaris for this test program along with associated plate and UO samples. Full-scale collapse and buckle propagation tests were conducted on a sample from each of the four UOE Pipes including one that was thermally aged. Additional coupon-scale work included measurement of the through-thickness variation of material properties and a thermal ageing study aimed at better understanding UOE Pipe strength recovery. The results of these tests will provide the basis for further refinement of the finite element model as the program proceeds into the next phase.Copyright © 2009 by ASME