Article
Engineering, Marine
Hang Wu, Haisheng Zhao, Yanfei Chen, Xin Li, Xin Feng
Summary: This study analyzes the buckling response of subsea pipelines with irregular corrosion defects. A method for calculating the critical buckling pressure of pipelines with irregular corrosion defects is proposed and its accuracy is verified by comparison with finite element (FE) results and experimental tests. The effects of defect size, steel grade, and diameter-to-thickness ratio on defect interaction and critical buckling pressure are explored. The application range of the method is extended by considering defect length, initial ovality, and internal pressure.
Article
Engineering, Civil
Yi Shuai, Xinhua Wang, Junqiang Wang, Heng-Gang Yin, Y. Frank Cheng
Summary: The study showed that the type-B sleeve repair method effectively restores the pressure-bearing capacity of the corroded X80 steel pipeline under internal pressure, with burst failures typically occurring far from the sleeve and defect region. The depth of the corrosion defect significantly affects repair effectiveness, while the length and width of the defect have limited impact on the stress level of the repaired pipeline.
THIN-WALLED STRUCTURES
(2021)
Review
Engineering, Marine
Fengming Du, Cong Li, Weiwei Wang
Summary: Oil and gas exploration plays a crucial role in the global economy and contributes significantly to its development. The safety of subsea pipelines is greatly affected by issues such as buckling, corrosion, and leakage. Serious leaks or damages to subsea pipelines can lead to wastage of resources and even explosions, causing severe casualties and economic losses, as well as detrimental effects on the surrounding ecological environment. Therefore, it is important to address problems related to the buckling, corrosion, and leakage of submarine pipelines. This paper provides a literature review of the latest research on buckling, corrosion, and leak detection.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2023)
Article
Engineering, Civil
Yang Yu, Zhenmian Li, Jianxing Yu, Lixin Xu, Siyuan Cheng, Jingyi Wu, Huakun Wang, Weipeng Xu
Summary: This study investigated the buckling failure analysis of buried subsea pipelines under reverse fault displacement, considering nonlinear soil-pipeline interaction and multiple nonlinearities. The results show that subsea pipelines have a large deformation capacity, with external pressure being more unfavorable than internal pressure.
THIN-WALLED STRUCTURES
(2021)
Article
Engineering, Marine
Mahmoud Alrsai, Feda'a Al-Amarat, Hassan Karampour, Husam Alsanat
Summary: The study introduced the concept of textured pipes for subsea pipeline applications and compared their collapse responses to conventional pipes under external pressure. Results showed that textured pipes have a significantly delayed collapse failure and higher collapse pressure compared to conventional pipes. By conducting experimental and numerical research, it was found that textured pipes exhibit greater resistance to external pressure and higher collapse pressure, making them a more resilient option for subsea pipeline applications.
Article
Engineering, Civil
Yang Yu, Zhenmian Li, Jianxing Yu, Leige Xu, Mingren Zhao, Yupeng Cui, Han Wu, Qinghao Duan
Summary: This study investigates the buckling behaviors of subsea pipelines with integral buckle arrestors under external pressure. Results show that the VFIFE model can accurately predict buckling loads and simulate buckling modes for pipelines with diameter-to-thickness ratios greater than 20, but may underestimate structural strength for pipelines with smaller ratios. The VFIFE offers a new, practical, and universal analytic strategy for subsea pipeline buckling analysis.
THIN-WALLED STRUCTURES
(2021)
Article
Engineering, Marine
Yufang Li, Wei Jiang, Li Zeng, Yingying Wang, Zhihan Liu, Shibin Ye
Summary: This paper examines the technology for repairing deep water pipelines and proposes a new type of subsea pipeline repair connector designed for deep water environments. By using mathematical models and simulation analysis, the structure of the connector is optimized and the anchoring and sealing performance is improved.
Article
Engineering, Marine
Zhenkui Wang, C. Guedes Soares
Summary: In this study, a mathematical model is proposed to simulate upheaval buckling of lined subsea pipelines based on nonlinear assumptions and beam theory. Analytical solutions are derived and validated against literature results. The study analyzes the influence of material properties and thickness ratio on post-buckling response, and compares the behavior of the outer pipe and liner in upheaval buckling.
Article
Engineering, Marine
Hang Wu, Haisheng Zhao, Xin Li, Xin Feng
Summary: By employing a semi-analytical method based on shell buckling theory, this study analyzed the elastoplastic buckling response and pressure of pipes with dual corrosion defects. The accuracy of the approach was verified through comparison with experimental tests and FE analysis, and various factors affecting the buckling pressure of pipes were thoroughly investigated. Additionally, the scope of application for different defect lengths and initial ovality of pipes was considered, and the method was extended to pipes with multiple corrosion defects.
Article
Engineering, Multidisciplinary
Jian Zhao, Yunrong Lv, Y. Frank Cheng
Summary: This study developed a new finite element-based method to assess the pressure capacity of a corroded X80 steel pipe containing a dent, considering their interaction and the effect on further corrosion growth. The presence of a dent significantly changes the local stress distribution and elevates stress to plastic range. The interaction between the dent and the corrosion defect depends on the initial corrosion depth and the initial dent depth. This interaction must be included in the assessment of pipeline burst failure.
INTERNATIONAL JOURNAL OF PRESSURE VESSELS AND PIPING
(2022)
Article
Engineering, Marine
Michael Lo, Saravanan Karuppanan, Mark Ovinis
Summary: This study developed a new assessment equation using an artificial neural network model to predict the failure pressure of corroded pipelines with a single corrosion defect, outperforming conservative estimates by traditional standards.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2022)
Article
Engineering, Civil
Hang Wu, Haisheng Zhao, Xin Li, Xin Feng
Summary: This study analyzed the buckling behavior of corroded submarine pipelines under external pressure using a semi-analytical approach. By solving characteristic equations of different buckling modes, the buckling pressure was calculated and compared with finite element models, experimental tests, and previous equations. The study investigated the effects of parameters on the buckling pressure and discussed the applicability of the semi-analytical approach under various conditions. Additionally, the post-buckling behavior of the corroded pipe was examined in detail.
THIN-WALLED STRUCTURES
(2021)
Article
Engineering, Civil
Guojin Qin, Y. Frank Cheng
Summary: The study found that the M-E effect at corrosion defect on pipelines increases stress concentration and corrosion rate, reducing the failure pressure of the pipe. The effect is more pronounced when the pipe is suspended. The depth of the defect has a significant impact on stress and current density.
THIN-WALLED STRUCTURES
(2021)
Article
Engineering, Ocean
Liang Feng, Dingyu Huang, Xuguang Chen, Hongda Shi, Shuqing Wang
Summary: This paper investigated the residual ultimate strength of pipelines with uniform pitting corrosion under external pressure, analyzing the influences of pit corrosion intensity, relative pitting depth, corrosion region length, and pitting distribution. It was found that pit corrosion intensity and relative pitting depth have significant effects on ultimate strength due to relative metal loss, while the influence of corrosion length is relatively small. Additionally, it was concluded that random distribution can be simplified to uniform distribution with the same parameters.
APPLIED OCEAN RESEARCH
(2021)
Article
Engineering, Civil
Zhenmian Li, Jianxing Yu, Yang Yu, Xin Liu, Zhenglong Yang, Xiaowei Liu, Zhiwei Zhang
Summary: This study investigates the deformation of buried subsea pipelines under different pressure-reverse fault displacement loading paths using the nonlinear vector form intrinsic finite element method (VFIFE). The effects of loading paths on structural responses, especially elasto-plastic deformation, are analyzed. The study quantifies the damage and failure modes of the pipeline under accidental reverse fault displacement and provides insights into seismic design methodologies and engineering practice for buried subsea pipelines.
THIN-WALLED STRUCTURES
(2023)
Article
Engineering, Marine
Alba Ricondo, Laura Cagigal, Beatriz Perez-Diaz, Fernando J. Mendez
Summary: This research presents a site-specific metamodel based on the SWASH numerical model simulations, which can predict coastal hydrodynamic variables in a fast and efficient manner. The metamodel uses downscaled and dimensionality reduced synthetic database to accurately reproduce wave setup, wave heights associated with different frequency bands, and wave runup. This method has great potential in coastal risk assessments, early warning systems, and climate change projections.
Article
Engineering, Marine
Xiao Yu, Wangjun Ren, Bukui Zhou, Li Chen, Xiangyun Xu, Genmao Ren
Summary: This study investigated and compared the compression responses and energy absorption capacities of coral sand and silica sand at a strain rate of approximately 1000 s-1. The results showed that coral sand had significantly higher energy absorption capacity than silica sand due to its higher compressibility. The study findings suggest that using poorly graded coral sand can improve its energy absorption capacity.
Article
Engineering, Marine
Jingxi Zhang, Junmin Mou, Linying Chen, Pengfei Chen, Mengxia Li
Summary: This paper proposes a cooperative control scheme for ship formation tracking based on Model Predictive Control. A predictive observer is designed to estimate the current motion states of the leader ship using delayed motion information. Comparative simulations demonstrate the effectiveness and robustness of the proposed controller.
Article
Engineering, Marine
Yu Yao, Danni Zhong, Qijia Shi, Ji Wu, Jiangxia Li
Summary: This study proposes a 2DH numerical model based on Boussinesq equations to investigate the impact of dredging reef-flat sand on wave characteristics and wave-driven current. The model is verified through wave flume experiments and wave basin experiments, and the influences of incident wave conditions and pit morphological features on wave characteristics are examined.
Article
Engineering, Marine
Jayanta Shounda, Krishnendu Barman, Koustuv Debnath
Summary: This study investigates the double-average turbulence characteristics of combined wave-current flow over a rough bed with different spacing arrangements. The results show that a spacing ratio of p/r=4 offers the highest resistance to the flow, and the double-average Reynolds stress decreases throughout the flow depth. The advection of momentum-flux of normal stress shows an increase at the outer layer and a decrease near the bed region after wave imposition. Maximum turbulence kinetic energy production and diffusion occur at different layers. The turbulence structure is strongly anisotropic at the bottom region and near the outer layer, with a decrease in anisotropy observed with an increase in roughness spacing.
Article
Engineering, Marine
Meng Zhang, Lianghui Sun, Yaoguo Xie
Summary: The research proposes a method for online identification of wave bending and torsional moment in hull structures. For structures without large openings, the method optimizes sensor positions and establishes a mathematical model to improve accuracy. For structures with large openings, a joint dual-section monitoring method is proposed to simultaneously identify bending and torsional moments in multiple key cross sections.
Article
Engineering, Marine
Longming Chen, Shutao Li, Yeqing Chen, Dong Guo, Wanli Wei, Qiushi Yan
Summary: This study investigated the dynamic response characteristics and damage modes of pile wharves subjected to underwater explosions. The results showed that the main damaged components of the pile wharf were the piles, and inclined piles had a higher probability of moderate or more significant damage compared to vertical piles. The study also suggested that replacing inclined piles with alternative optimized structures benefits the blast resistance of pile wharves.
Article
Engineering, Marine
I. -C Kim, G. Ducrozet, V. Leroy, F. Bonnefoy, Y. Perignon, S. Bourguignon
Summary: Previous research focused on the accuracy and efficiency of short-term wave fields in specific prediction zones, while we developed algorithms for continuous wave prediction based on the practical prediction zone and discussed important time factors and strategies to reduce computational costs.
Article
Engineering, Marine
Hang Xie, Xianglin Dai, Fang Liu, Xinyu Liu
Summary: This study investigates the load characteristics of a three-dimensional stern model with pitch angle through a drop test, and reveals complex characteristics of pressure distribution near the stern shaft. The study also shows that the vibration characteristics of the load are influenced by the drop height and pitch angle, with the drop height having a greater effect on the high-frequency components.
Article
Engineering, Marine
Hangyuan Zhang, Wanli Yang, Dewen Liu, Xiaokun Geng, Wangyu Dai, Yuzhi Zhang
Summary: The deep-water bridge is more vulnerable to earthquake damage than the bridge standing in air. The larger blocking ratio has a significant impact on the added mass coefficient, which requires further comprehensive study. The generation mechanism of block effect is analyzed using numerical simulation software ANSYS Fluent. The results show that the recirculation zone with focus reduces the pressure on the back surface of the cylinder, resulting in the peak value of in-line force not occurring synchronously with the peak value of acceleration. The change in position and intensity of the recirculation zone with focus, as well as the change in water flow around the cylinder surface, are identified as the generation mechanism of the block effect, which has a 10% influence on the hydrodynamic force. The changing rule of the added mass coefficient with blocking ratio is discussed in detail, and a modification approach to the current added mass coefficient calculation method is suggested. Physical experiments are conducted to validate the modification approach, and the results show that it is accurate and can be used in further study and real practice.
Article
Engineering, Marine
Golnesa Karimi-Zindashti, Ozgur Kurc
Summary: This study examines the performance of an in-house code utilizing a deterministic vortex method on the rotation of circular and square cylinders. The results show that rotational motion reduces drag forces, suppresses fluctuating forces, and increases lift forces. The code accurately predicts vortex shedding suppression and identifies the emergence of near-field wakes in the flow over rotating square cylinders.
Article
Engineering, Marine
George Dafermos, George Zaraphonitis
Summary: The survivability of damaged ships is of great importance and the regulatory framework is constantly updated. The introduction of the probabilistic damage stability framework has rationalized the assessment procedure. Flooding simulation tools can be used to investigate the dynamic response of damaged ships.
Article
Engineering, Marine
Xuyue Chen, Xu Du, Chengkai Weng, Jin Yang, Deli Gao, Dongyu Su, Gan Wang
Summary: This paper proposes a real-time drilling parameters optimization method for offshore large-scale cluster extended reach drilling based on intelligent optimization algorithm and machine learning. By establishing a ROP model with long short-term memory neurons, and combining genetic algorithm, differential evolution algorithm, and particle swarm algorithm, the method achieves real-time optimization of drilling parameters and significantly improves the ROP.
Article
Engineering, Marine
Sung-Jae Kim, Chungkuk Jin, MooHyun Kim
Summary: This study investigates the dynamic behavior of a moored submerged floating tunnel (SFT) under tsunami-like waves through numerical simulations and sensitivity tests. The results show that design parameters significantly affect the dynamics of the SFT system and mooring tensions, with shorter-duration and higher-elevation tsunamis having a greater impact.
Article
Engineering, Marine
G. Clarindo, C. Guedes Soares
Summary: Environmental contours are constructed using the Inverse-First Order Reliability Method based on return periods. The paper proposes the use of the Burr distribution to model the marginal distribution of long-term significant wave heights. The newly implemented scheme results in different environmental contours compared to the reference approach.