A modal finite element approach to predict the lateral buckling failure of the tensile armors in flexible pipes

Gonzalez, Gabriel Mattos; Sousa, José Renato M. de; Sagrilo, Luís Volnei Sudati

doi:10.1016/j.marstruc.2019.05.006

Cited by 16 publications

(4 citation statements)

References 12 publications

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“…The sand particles are mixed with petroleum, making the solution more viscous. The oil slurry is usually transported to FPSO (Floating Production, Storage and Offloading Unit) or the desired place using pipelines 29,30 . A schematic of particle erosion is shown in Figure 11.…”

Section: Methodsmentioning

confidence: 99%

Erosion Analysis for the Carcass of Unbonded Flexible Pipes

et al. 2022

Preprint

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At present, unbonded flexible pipes (UFPs) are widely used in ocean engineering for oil exploitation. In practice, erosion will lead to premature failure of pipelines. There is a lack of researches on the erosion of interlock carcass of UFPs. As the authority in the field of offshore engineering, DET NORSKE VERITAS(DNV) suggested a way to estimate the erosion rate of pipes, however, it does not study the erosion mechanism of UFPs in detail and the relevant parameters are not specified. This paper modifies erosion prediction of UFPs based on a user defined Fortran subroutine. A series of CFD simulations have been conducted, and three widely used erosion models were used for comparative verification. The effect of geometric shape on erosion rate has been carefully studied. and the effect of velocity, particle size, and concentration are also studied to verify the reliability of the improved model.

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Section: Methodsmentioning

confidence: 99%

Erosion Analysis for the Carcass of Unbonded Flexible Pipes

et al. 2022

Preprint

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“…There is a rising trend of research on the failure of the tensile armor layer of unbonded flexible risers, and many researchers have also investigated the failure characteristics of the structure through different methods in recent years [ 148 , 149 , 150 , 151 , 152 ].…”

Section: Development Of Cross-sectional Properties Of An Unbonded Fle...mentioning

confidence: 99%

Review of the Development of an Unbonded Flexible Riser: New Material, Types of Layers, and Cross-Sectional Mechanical Properties

Liu,

Qu,

Chen

et al. 2024

Materials

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Unbonded flexible risers consist of several helical and cylindrical layers, which can undergo large bending deformation and can be installed in different configurations to adapt to harsh marine environments; thus, they can be applied to transport oil and gas resources from ultra-deep waters (UDW). Due to their special geometric characteristics, they can ensure sufficient axial tensile stiffness while having small bending stiffness, which can undergo large deflection bending deformation. In recent years, the development of unbonded flexible risers has been moving in an intelligent, integrated direction. This paper presents a review of unbonded flexible risers. Firstly, the form and properties of each interlayer of an unbonded flexible riser are introduced, as well as the corresponding performance and configuration characteristics. In recent years, the development of unbonded flexible risers has been evolving, and the development of machine learning on unbonded flexible risers is discussed. Finally, with emphasis on exploring the design characteristics and working principles, three new types of unbonded flexible risers, an integrated production bundle, an unbonded flexible riser with an anti-H2S layer, and an unbonded flexible riser with a composite armor layer, are presented. The research results show that: (1) the analytical methods of cross-sectional properties of unbonded flexible risers are solved based on ideal assumptions, and the computational accuracy needs to be improved. (2) Numerical methods have evolved from equivalent simplified models to models that account for detailed geometric properties. (3) Compared with ordinary steel risers, the unbonded flexible riser is more suitable for deep-sea resource development, and the structure of each layer can be designed according to the requirements of the actual environment.

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“…The modal shapes are considered in the deformation and buckling of the marine hose, by using the dynamic responses of the marine hose system. This approach is utilised in the FEM of flexible risers [284,285,294,295]. In the third approach, it is assumed that the time-dependent terms are harmonic, with the form shown in Equation (136), with respect to time.…”

Section: Fundamental Approaches To the Motion Of Marine Hoses And Risersmentioning

confidence: 99%

Mathematical Modelling of Bonded Marine Hoses for Single Point Mooring (SPM) Systems, with Catenary Anchor Leg Mooring (CALM) Buoy Application—A Review

Amaechi

Wang

2021

JMSE

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The application of mathematical analysis has been an essential tool applied on Catenary Anchor Leg Mooring (CALM) buoys, Wave Energy Converters (WEC), point absorber buoys, and various single point mooring (SPM) systems. This enables having mathematical models for bonded marine hoses on SPM systems with application with CALM buoys, which are obviously a requisite for the techno-economic design and operation of these floating structures. Hose models (HM) and mooring models (MM) are utilized on a variety of applications such as SPARs, Semisubmersibles, WECs and CALM buoys. CALM buoys are an application of SPM systems. The goal of this review is to address the subject of marine hoses from mathematical modeling and operational views. To correctly reproduce the behavior of bonded marine hoses, including nonlinear dynamics, and to study their performance, accurate mathematical models are required. The paper gives an overview of the statics and dynamics of offshore/marine hoses. The reviews on marine hose behavior are conducted based on theoretical, numerical, and experimental investigations. The review also covers challenges encountered in hose installation, connection, and hang-off operations. State-of-the-art, developments and recent innovations in mooring applications for SURP (subsea umbilicals, risers, and pipelines) are presented. Finally, this study details the relevant materials that are utilized in hoses and mooring implementations. Some conclusions and recommendations are presented based on this review.

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A modal finite element approach to predict the lateral buckling failure of the tensile armors in flexible pipes

Cited by 16 publications

References 12 publications

Erosion Analysis for the Carcass of Unbonded Flexible Pipes

Erosion Analysis for the Carcass of Unbonded Flexible Pipes

Review of the Development of an Unbonded Flexible Riser: New Material, Types of Layers, and Cross-Sectional Mechanical Properties

Mathematical Modelling of Bonded Marine Hoses for Single Point Mooring (SPM) Systems, with Catenary Anchor Leg Mooring (CALM) Buoy Application—A Review

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