Pressure capacity of sandwich pipe with cement-based core configuration under deep-water external pressure

2020 ◽  
Vol 22 (4) ◽  
pp. 1292-1326
Author(s):  
Feng Wan ◽  
Feng Guan ◽  
Chuanxi Zhou ◽  
Shaohu Liu ◽  
Ting Yang
Keyword(s):  
Deep Water ◽  
Oil And Gas ◽  
Core Layer ◽  
External Pressure ◽  
Fiber Reinforced ◽  
Shear Strength Test ◽  
Steel Pipes ◽  
Wide Range ◽  
Parametric Studies ◽  
Value Decomposition

Sandwich pipe, consisting of two steel tubes and a polymeric or cement-based material core layer, has been considered as an attractive solution for oil and gas transporting in deep water. In this paper, the characteristic responses and pressure capacity of sandwich pipes having fiber-reinforced cementitious composites core configuration under external hydrostatic pressure were investigated. The interface adhesion behavior between the fiber-reinforced cementitious composite core and the surrounding steel pipes was modeled based on the inter-layer shear strength test experiments conducted on the sandwich pipe specimens. The parametric studies were carried out to evaluate the influence of geometry parameters and steel grade on the buckling response and ultimate pressure capacity. Furthermore, 768 FE models of sandwich pipes covering a wide range of practical design configurations were rapidly constructed and analyzed using FE software package ABAQUS with the help of programming language Python. Finally, a simplified equation for predicting the pressure capacity of sandwich pipes within the scope of this study was proposed using dimensional analysis combined with singular value decomposition methodology.

scholarly journals Towards the Development of Novel Hybrid Composite Steel Pipes: Electrochemical Evaluation of Fiber-Reinforced Polymer Layered Steel against Corrosion

Polymers ◽  
2021 ◽  
Vol 13 (21) ◽  
pp. 3805
Author(s):  
Fatima Ghassan Alabtah ◽  
Elsadig Mahdi ◽  
Faysal Fayez Eliyan ◽  
Elsadig Eltai ◽  
Marwan Khraisheh
Keyword(s):  
Polymer Coating ◽  
Electrochemical Impedance ◽  
Distribution Networks ◽  
Fiber Reinforced Polymer ◽  
Resin Matrix ◽  
Fiber Reinforced ◽  
Acid Attack ◽  
Steel Pipes ◽  
Reinforced Polymer ◽  
Wide Range

Corrosion remains one of the major and most costly challenges faced by the steel industry. Various fiber-reinforced polymer coating systems have been proposed to protect metallic piping distribution networks against corrosion. Despite increasing interest among scientific and industrial communities, there is only limited predictive capability for selecting the optimum composite system for a given corrosive condition. In this study, we present a comprehensive evaluation of the electrochemical behavior of two different fiber-reinforced polymer composite systems against the corrosion of carbon steel pipes under a wide range of acidic and corrosive solutions. The composites were made of glass and Kevlar fibers with an epoxy resin matrix and were subjected to corrosive solutions of 0.5 M NaCl, 0.5 M HCl, and 0.5 M H2SO4. The kinetics of the corrosion reactions were evaluated using potentiodynamic polarization (PDP) tests. In addition, electrochemical impedance spectroscopy (EIS) tests were carried out at open circuit potentials (OCPs). It was demonstrated that the glass fiber-reinforced polymer coating system offered the best protection against corrosion, with a high stability against deterioration when compared with epoxy and Kevlar fiber-reinforced polymer coating systems. Scanning electron microscopy images revealed cracks and deteriorated embedded fibers due to acid attack, sustained/assisted by the diffusion of the corrosion species.

Analysis of Mechanical Properties of Carbon Fiber Reinforced Spiral Rod in Umbilical

2019 ◽  
Author(s):  
Yu Zhang ◽  
Ning-yi Cheng ◽  
Yi Zhao ◽  
Peng Zhang
Keyword(s):  
Mechanical Properties ◽  
Finite Element ◽  
Carbon Fiber ◽  
Deep Water ◽  
Mathematical Analysis ◽  
Development Process ◽  
Oil And Gas ◽  
Fiber Reinforced ◽  
Element Calculation ◽  
Carbon Fiber Reinforced

Abstract Nowadays, the weight of steel pipelines restricts the development process of deep-water oil and gas. Using spiral carbon fiber reinforced rod instead of the steel armored layer in the umbilical can effectively solve the contradiction between carrying capacity and self-weight of the umbilical cable in the deep-water oil and gas development process. In this paper, using anisotropic carbon fiber materials, the stiffness matrix of the spiral carbon fiber reinforced rod under the tension-torsion coupled load is deduced through mathematical analysis and finite element calculation. It is found that the results of various stiffness coefficients obtained by mathematical analysis are closed to the finite element calculation. In addition, the integral form of carbon fiber reinforced umbilical is determined preliminarily, and the overall mechanical properties of umbilical are carried out. It is found that carbon fiber reinforced spiral rod in umbilical could have good mechanical properties with less weight.

Design Optimization of Top-Tensioned Risers for Deepwater HPHT Applications: Part 1

2010 ◽  
Author(s):  
Lixin Xu ◽  
Paul Stanton
Keyword(s):  
High Pressure ◽  
Performance Optimization ◽  
Oil And Gas ◽  
Production Systems ◽  
High Strength ◽  
Environmental Loads ◽  
Steel Pipes ◽  
Design Concepts ◽  
Wide Range ◽  
The Impact

Dry-tree solutions with top-tensioned risers (TTRs) have been successfully used with floating production systems (FPS), such as Spars and TLPs, in a wide range of deepwater applications. Both single-casing and dual-casing top-tensioned risers are field-proven in existing field developments. The top-tensioned risers bring technical advantages and operational cost benefits. However, recent oil and gas developments that have high pressure and high temperature (HPHT) in combination with severe environmental loads push the design limits of conventional steel pipes in deepwater risers. High-strength steel pipes are therefore considered for risers for both technical and economic reasons. This paper discusses the impact of the above requirements on design of top-tensioned risers, and proposes feasible design concepts for top tensioned risers with extremely high pressure requirements. Part I of the topic here addresses strategies of top-tensioned riser sizing and weight management, and design considerations for TTR specialty joints. Part II of this topic will follow for top-tensioned riser tensioning system configuration and tension performance optimization, as well as coupled motion compensation on the host platform. The objective of the study that forms the basis for this paper is to provide top-tensioned riser system configurations that meet the challenges of the extremely high operational pressure and environmental loads in deep and ultra-deep waters.

Safety Level on Different Offshore Pipeline Design Criteria: A Comparison Between DNV-OS-F101 and API RP-1111 Codes

2016 ◽  
Author(s):  
Luis D’Angelo ◽  
Hans M. Thorsen ◽  
Olav Fyrileiv ◽  
Leif Collberg ◽  
Sonia Furtado
Keyword(s):  
Failure Modes ◽  
Oil And Gas ◽  
Local Buckling ◽  
Oil And Gas Industry ◽  
External Pressure ◽  
Design Criteria ◽  
Load Parameter ◽  
Safety Level ◽  
Wide Range ◽  
Pipeline Design

Submarine pipelines are more often than before required to operate in harsh environments, especially for systems deployed in ultra-deep water. In order to minimize the installation tension due to the hanged section, they are installed empty and therefore the external pressure is often the prime load parameter for the design. New discoveries and associated technical challenges have generated important research and development endeavors in a wide range of disciplines in order to improve efficiency and reliability, but also keeping the risks associated with the new scenarios within an acceptable range. Some aspects that can be mentioned include, for instance, steel line grade improvements and manufacturing innovations of pipe products; more powerful lay vessels and development of new pipeline installation methods; determination of the mechanical behavior and the expected failure modes of concern for deep and long pipelines under combined loads; and the improved different design criteria like the DNV-OS-F101 (1) and API RP-1111 (2) codes. The intention of this paper is to review and compare three different pipeline design criteria well established in the oil and gas industry. The pipeline wall thickness design for pipe pressure containment (bursting), local buckling (system collapse) and propagating buckling for DNV-OS-F101 (1) and API RP-1111 (2) are discussed as well as the parameters used, definitions, safety philosophy and code limitations. A pipeline example is used to illustrate and compare the results.

Design Optimization of Top-Tensioned Risers for Deepwater HPHT Applications: Part II

2011 ◽  
Author(s):  
Lixin Xu
Keyword(s):  
Performance Optimization ◽  
Oil And Gas ◽  
Production Systems ◽  
High Strength ◽  
Environmental Loads ◽  
Steel Pipes ◽  
Deep Waters ◽  
Wide Range ◽  
System Configurations ◽  
The Impact

Dry-tree solutions with top-tensioned risers (TTRs) have been successfully used with floating production systems (FPS), such as Spars and TLPs, in a wide range of deepwater applications. Both single-casing and dual-casing top-tensioned risers are field-proven in existing field developments. The top-tensioned risers can bring technical advantages and operational cost benefits. Moreover, recent oil and gas developments that have high pressure and high temperature (HPHT) in combination with severe environmental loads lead to more design challenges for steel risers in deepwater, pushing the design limits of conventional steel pipes in deepwater risers. High-strength steel pipes are therefore considered for both technical and economic reasons. The objective of the study that forms the basis for this paper is to provide top-tensioned riser system configurations that meet challenges of the extremely high operational pressure and environmental loads in deep and ultra-deep waters. Part I of the paper was published in OMAE 2010 [1], addressing strategies for top-tensioned riser sizing and weight management for HPHT applications in deep and ultra-deep waters, and also design considerations for TTR specialty joints. Part II here present spar top-tensioned risers and their support tensioning systems. The paper illustrates the HPHT riser global configuration on spar and the tensioning system performance optimization, as well as coupled motion compensation with the spar platform. The impact of riser loads on spar global performance is also discussed.

Analysis of the Mechanical Behaviors of Fiber Reinforced Unbonded Flexible Pipe Under Combined Load

2020 ◽  
Author(s):  
Baodong Wang ◽  
Hong Zhang ◽  
Xiaoben Liu ◽  
Lixin Xu ◽  
Yang Fu
Keyword(s):  
Internal Pressure ◽  
Oil And Gas ◽  
Tensile Load ◽  
External Pressure ◽  
Gas Production ◽  
Small Scale ◽  
Fiber Reinforced ◽  
Mechanical Behaviors ◽  
Flexible Pipe ◽  
Combined Load

Abstract Unbonded flexible pipe is widely used in the oil and gas industry for its good flexibility, especially in deepwater oil and gas transportation. And the fiber reinforced unbonded flexible pipe has excellent corrosion resistance and wear resistance. However, they are subjected to internal pressure, external pressure and tensile loads during the service process, which are important factors affecting the integrity and security of the flexible pipe. In this paper, the mechanical behaviors of an 8-inchs fiber reinforced unbonded flexible pipe used in offshore gas development which consists of internal layer, internal pressure reinforcement layers, anti-wear layers, external pressure armor, tensile reinforcement layers and outer sheath is investigated by numerical methods. A rigorous three-dimensional solid finite element model of flexible pipe that considers the real material parameters, structural nonlinearity as well as the nonlinear contact behavior was created. ABAQUS/Explicit quasi-static simulation is adopted to study the mechanical behaviors of the flexible pipe under combined load. And the accuracy of the simulation method for the fiber reinforced layers such as internal pressure layer is verified by comparing with the small-scale internal pressure burst test of 1-inch flexible pipe. The mechanical behavior of flexible pipe subjected to internal pressure, external pressure and tensile load was investigated in detail. Based on the contrastive analysis, some practical conclusions have been obtained which may be used for the practical design and production of flexible pipe. This study can be referenced for the applications of unbonded flexible pipe in marine oil and gas production.

scholarly journals Finite Element Analysis of Cyclically-Loaded Steel Pipes During Deep Water Reeling Installation

2015 ◽  
Author(s):  
Giannoula Chatzopoulou ◽  
Spyros A. Karamanos ◽  
George E. Varelis
Keyword(s):  
Deep Water ◽  
Structural Response ◽  
Structural Instability ◽  
External Pressure ◽  
Combined Loading ◽  
Loading Path ◽  
Pipe Material ◽  
Element Analysis ◽  
Steel Pipes ◽  
Structural Capacity

Thick-walled steel pipes during their installation in deep-water are subjected to combined loading of external pressure and bending, which may trigger structural instability due to excessive pipe ovalization with catastrophic effects. The loading path followed during the reeling installation process is characterized by strong cyclic loading of the pipe material and results in residual stresses and deformations of the pipe cross-section, undermining the structural capacity of the pipe. Using advanced material tools, the present study examines the effect of reeling on the structural response and resistance of offshore pipes during the installation process.

Tubarão Martelo Field Riser System: Shallow Water Challenging

2015 ◽  
Author(s):  
Elton J. B. Ribeiro ◽  
Zhimin Tan ◽  
Yucheng Hou ◽  
Yanqiu Zhang ◽  
Andre Iwane
Keyword(s):  
Shallow Water ◽  
Deep Water ◽  
Oil And Gas ◽  
Vertical Motion ◽  
Oil And Gas Industry ◽  
System Configuration ◽  
Wave Load ◽  
Gas Industry ◽  
Campos Basin ◽  
Water Problem

Currently the oil and gas industry is focusing on challenging deep water projects, particularly in Campos Basin located coast off Brazil. However, there are a lot of prolific reservoirs located in shallow water, which need to be developed and they are located in area very far from the coast, where there aren’t pipelines facilities to export oil production, in this case is necessary to use a floating production unit able to storage produced oil, such as a FPSO. So, the riser system configuration should be able to absorb FPSO’s dynamic response due to wave load and avoid damage at touch down zone, in this case is recommended to use compliant riser configuration, such as Lazy Wave, Tethered Wave or Lazy S. In addition to, the proposed FPSO for Tubarão Martelo development is a type VLCC (Very Large Crude Carrier) using external turret moored system, which cause large vertical motion at riser connection and it presents large static offset. Also are expected to install 26 risers and umbilicals hanging off on the turret, this large number of risers and umbilicals has driven the main concerns to clashing and clearance requirement since Lazy-S configuration was adopted. In this paper, some numerical model details and recommendations will be presented, which became a feasible challenging risers system in shallow water. For instance, to solve clashing problem it is strictly recommended for modeling MWA (Mid Water Arch) gutter and bend stiffener at top I-tube interface, this recommendation doesn’t matter in deep water, but for shallow water problem is very important. Also is important to use ballast modules in order to solve clashing problems.

scholarly journals Finite element analysis of cyclically-loaded steel pipes during deep water reeling installation

2016 ◽  
Vol 124 ◽  
pp. 113-124 ◽  
Author(s):  
Giannoula Chatzopoulou ◽  
Spyros A. Karamanos ◽  
George E. Varelis
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Deep Water ◽  
Element Analysis ◽  
Steel Pipes
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