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Key Technologies and Breakthrough Path of Hydrogen Production by Offshore Wind Power GAO Chang, LI Hongtao Ocean Engineering Equipment and Technology    2023, 10 (2): 89-94.   DOI: 10.12087/oeet.2095-7297.2023.02.14 Abstract （1566）      PDF（pc） （2904KB）（2950）       Knowledge map    Save Marine renewable energy is abundant but difficult to store. The generation of green hydrogen from offshore renewable energy can provide a new idea for the storage of green energy. This paper mainly analyzes the key technologies of hydrogen production from offshore wind power, focusing on the four aspects of offshore water electrolysis hydrogen production technology, offshore hydrogen energy storage and transportation technology, offshore hydrogen production and storage equipment design, as well as offshore hydrogen production and storage scheme. This paper compares and summarizes the key technologies of offshore wind power hydrogen production in China, and puts forward relevant countermeasures and suggestions on this basis. It provides reference for the innovative development of offshore wind power hydrogen production technology and equipment in China. Related Articles | Metrics | Comments（0）

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A Brief Summary of Key Points for The Installation of Offshore Wind Turbine Monopile Foundation FAN Changhui Ocean Engineering Equipment and Technology    2023, 10 (2): 1-7.   DOI: 10.12087/oeet.2095-7297.2023.02.01 Abstract （1384）      PDF（pc） （6154KB）（2838）       Knowledge map    Save The installation of offshore wind turbine monopile foundation requires a variety of ship machinery and lifting equipment, etc. If the suitabe selection of those above matters could make the completion of the construction objectives be achieved. In order to select suitable ship machinery lifting equipment, using project as example the compare between domestic and foreign monopile installation, the selection consideration of the main floating crane ship and the drivability of the hydraulic hammer are specifically analyzed through the verification analysis of the monopile stabilizing platform and the description of other additional installation points, which shows that the main considerations for the selection of marine machinery and lifting equipment for offshore wind turbine monopile installation in China and the verification analysis methods are useful. These can provide serve as for the selection of marine floating machine for monopile installation, for the design and verification of monopile stabilizing platform, and for the preparation of construction organization and scheme. Related Articles | Metrics | Comments（0）

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Development of Mooring Connectors and its Application in Floating Offshore Wind Turbine DONG Xin, XU Qun, SHAO Yunliang Ocean Engineering Equipment and Technology    2024, 11 (1): 130-138.   DOI: 10.12087/oeet.2095-7297.2024.01.20 Abstract （1335）      PDF（pc） （4193KB）（1366）       Knowledge map    Save As a key part of position mooring system， connectors have been widely used for the joining of mooring lines with floating structures or different mooring components. Recently， with the development of floating offshore wind， multiple demonstration projects have been reported worldwide and large scale projects are under planning. The cost must be controlled for the floating wind to realize commercialization by technological innovation， including the mooring system. The mooring connectors have been utilized and verified in the offshore industry for the last several decades and played an important role in connection， installation， maintenance and replacement of mooring system. With the development and flexible application of the mooring connectors， the design， fabrication and installation of floating wind turbine could be significantly improved and the cost of floating wind will be effectively reduced.  Related Articles | Metrics | Comments（0）

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Research on Digital and Intelligent Transformation of Discrete Offshore Oil and Gas Equipment Manufacturing Industry HE Chen, LUO Chao, LIU Shicong, KANG Dongchun, WANG Liang Ocean Engineering Equipment and Technology    2023, 10 (2): 106-111.   DOI: 10.12087/oeet.2095-7297.2023.02.17 Abstract （1237）      PDF（pc） （4845KB）（628）       Knowledge map    Save This paper firstly expounds the impact of the application of digital technology and intelligent on the manufacturing industry technology in the field of information technology. The cutting-edge technologies related to intelligent manufacturing are then introduced in detail, and the latest industry status quo is briefly analyzed. Then, in conjuction with the unique characteristics of equipment construction in the current offshore petroleum engineering industry, it conducts an in-depth analysis, and clarifies the pain points brought to offshore petroleum engineering by the characteristics of discrete equipment manufacturing. Finally, according to the current status of discrete manufacturing, combined with the field practice accumulated over the years, through 3D model design, intelligent robots and other multi-dimensional exploration the digital and intelligent transformation are studied in this paper. Related Articles | Metrics | Comments（0）

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Summary of Development of Flexible Riser Structural Technology in Deep Water Yan Jun, Ying Xipeng, Bu Yufeng, Li Wen-bo, Wu Shang-hua, Lu Qing-zhen, Tang Ming gang , Yue Qian jin Ocean Engineering Equipment and Technology    DOI: 10.12087/oeet.2095-7297.2019.06.01 Accepted: 14 October 2024

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Development Status and Prospects of Remotely Operated Vehicles LIAN Lian, WEI Zhao-yu, TAO Jun, REN Ping, MA Xia-fei Ocean Engineering Equipment and Technology    2018, 5 (4): 223-231.   DOI: 10.12087/oeet.2095-7297.2018.04.01 Abstract （1203）      PDF（pc） （3209KB）（464）       Knowledge map    Save Human beings cannot explore and exploit the deep ocean resources without the help of submersibles. Among all kinds of submersibles, the remotely operated vehicles (ROVs) have been widely deployed since they have strong working ability and are free from power constraints. In this work, we first present and summarize the definition, basic classification, system composition, developing history and status, application demanding and national strategic importance for the ROVs. Then, some key technologies for the current design and development of ROVs are presented and discussed. Finally, some possible developing directions and the characteristics of the future ROVs are summarized, which can be referenced to develop and design the new generation ROVs. Reference | Related Articles | Metrics | Comments（0）

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Engineering Exploration and Practice of Key Technology for Floating Offshore Wind Turbine Equipment LI Hongtao, YANG Linlin, QU Xiaoqi, SUN Tao Ocean Engineering Equipment and Technology    2023, 10 (2): 79-88.   DOI: 10.12087/oeet.2095-7297.2023.02.13 Abstract （1203）      PDF（pc） （12983KB）（262）       Knowledge map    Save Floating offshore wind turbine equipment has gradually become a hot topic in the development of deep-sea renewable energy. However, there are still a series of technical difficulties and challenges in the commercialization of floating offshore wind turbine. This study systematically combs the key technologies for design and analysis of floating offshore wind turbine equipment. The solutions and analysis methods are put forward regarding six aspects including overall performance analysis, structural global strength, mooring system design, fatigue strength analysis, stability check and dynamic cable design. A set of useful conclusions and suggestions are given through the introduction of actual domestic floating offshore wind turbine engineering project. Engineering exploration and practice are performed on the development of floating offshore wind turbine equipment in China, and it is expected to provide useful reference for the development and expansion of China's floating offshore wind turbine technology. Related Articles | Metrics | Comments（0）

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Techno-economic Evaluation of Hydrogen Production through Offshore Wind Farms LIU Chao, LI Ouping, CHENG Guangyuan, SHEN Qi, YU Xichong Ocean Engineering Equipment and Technology    2024, 11 (1): 116-121.   DOI: 10.12087/oeet.2095-7297.2024.01.18 Abstract （1184）      PDF（pc） （823KB）（200）       Knowledge map    Save Offshore wind resources in deep-water is more abundant and will be one of the main development trends in the next few years. However， offshore wind development faces many challenges such as the power transmission and consumption. It needs new development models and technological innovations to be promoted. Hydrogen production through offshore wind would improve the power system flexibility and safety， and could be used as renewable energy storage to achieve large-scale and long-term storage. Based on the market price and literature， the tech-economic comparison and evaluation are carried of onshore off-grid hydrogen production and offshore hydrogen production with pipeline from the levelized cost of hydrogen and internal rate of return. Based on the whole life cost， the levelized cost of hydrogen production through offshore with pipeline is lower and the CAPEX and OPEX of water electrolysis system have a significant impact on the LCOH. In terms of economy， offshore wind will obtain higher returns than offshore hydrogen production if all electricity could be imported to the power system. Related Articles | Metrics | Comments（0）

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Adaptability Analysis of Offshore New Energy Storage Technology Under Dual-carbon Background SHEN Qi, LI Ouping, LIU Chao, CHENG Guangyuan, YU Xichong Ocean Engineering Equipment and Technology    2024, 11 (1): 106-115.   DOI: 10.12087/oeet.2095-7297.2024.01.17 Abstract （1124）      PDF（pc） （1237KB）（1003）       Knowledge map    Save This paper sorts out relevant engineering cases at home and abroad， analyzes the advantages and disadvantages of physical energy storage and electrochemical energy storage in offshore applications based on three scenarios: the mandatory requirement of energy storage systems policy for large-scale offshore wind farms， energy storage for improving the penetration of offshore wind power into the grid for integrated development of offshore oil and gas and new energy， and energy storage for off-grid production of green hydrogen， green ammonia， and green methanol. Considering the technology maturity， safety， reliability， compactness， lightweight， economy， and other factors， the most suitable energy storage applied offshorely is still the LFP battery. In the future， considering the superiority of lithium titanate oxide （LTO） batteries in terms of safety， after the cost is reduced， the choice of LTO battery could be considered. But due to the low density of LTO battery， the volume and quality of the equipment are larger than that of LFP battery， and the layout of the offshore platform needs to be further considered. In addition， because there is no single energy storage system that can simultaneously have the characteristics of high power， large energy storage density， reliable safety， and long life cycle， the use of “flywheel+” and “supercapacitor+”hybrid energy storage system is considered， to maximize the shortcomings of a single energy storage method to make up for， to obtain a better performance of the energy storage system. In order to ensure the safety and reliability of new energy storage engineering applications at sea， it is suggested that further research and engineering application of technologies such as the intrinsic safety， safety monitoring and early warning of energy storage under the anti-sloshing conditions of floating facilities at sea should be carried out. Related Articles | Metrics | Comments（0）

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New Breakthrough in USV Warfare Mode in the Russo-Ukrainian Conflict HU Zhihuan, XIE Wei, LIU Ruonan, ZHANG Weidong Ocean Engineering Equipment and Technology    2024, 11 (1): 18-22.   DOI: 10.12087/oeet.2095-7297.2024.01.03 Abstract （1102）      PDF（pc） （698KB）（2163）       Knowledge map    Save In recent years， with the rapid development of technology， the application of USV technology in the military field has gradually become one of the focuses of international military competition. In the Russo Ukrainian War， the USV maritime combat mode has shown new breakthroughs， providing new ideas and possibilities for future maritime operations. This article explores the application value， technical characteristics， and future development trends of unmanned vessels in maritime operations during the Russo Ukrainian War through practical case analysis. The aim is to provide reference and inspiration for research and practice in related fields. Related Articles | Metrics | Comments（0）

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Lifting Methods for Vertical Construction of Offshore Wind Turbine Jacket CHEN Shiwei Ocean Engineering Equipment and Technology    2023, 10 (3): 83-89.   DOI: 10.12087/oeet.2095-7297.2023.03.12 Abstract （1081）      PDF（pc） （11405KB）（172）       Knowledge map    Save The offshore wind turbine jacket is relatively small and needs to be built in batches, therefore, it mostly adopts vertical construction process. However, due to the particularity of this type of jacket structure, offshore wind turbine jacket will faces a lot of hard lifting operations during its vertical construction process. Currently, there is no relevant lifting experience and engineering case for reference. Hereto, this paper based on a 2000T class large offshore wind turbine jacket project, introduced the general assembly process of this jacket, analyzed the technical difficulties of its assembly in different process, provides a lifting method for TP and upper jacket integrated lifting and lower jacket turn over lifting. Practice has proved that the method can effectively solve a series of lifting problems, such as difficult arrangement of lifting points, high difficulty of assembly and high requires of crane performance. This paper could help realize the batch construction of offshore wind turbine jacket and provide technical support for other similar projects. Related Articles | Metrics | Comments（0）

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Subsea Pipeline Span Analysis Based on Fatigue Life Xiu-feng LI, Xian-hong FENG Ocean Engineering Equipment and Technology    2015, 2 (3): 196-200.   Abstract （1079）   HTML （2）    PDF（pc） （2536KB）（1183）       Knowledge map    Save Traditionally, span analysis determines the maximum allowable free span length based on the condition that no vortex induced vibration (VIV) will happen and the assumption of strength ultimate limit state (ULS). The cost of span mitigation rises rapidly with the increase of water depth. Free span analysis based on fatigue life could remarkably increase the maximum allowable span length and cut the engineering cost. We present the free span analysis method and criteria for subsea pipeline. Based on the engineering project which is the first time to use fatigue limit for pipeline design, the free span analysis is conducted by fatigue limit state (FLS) and finite element method, and the results minimize the number of span mitigation. Table and Figures | Reference | Related Articles | Metrics | Comments（0）

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Numerical Analysis and Risk Study of Large Offshore Converter Station Transportation and Floatover Installation Xiong Gen, Liang Fusheng, Li Xin, Sun Zhenzhou, Xu Xin, Tian Xinliang, Ocean Engineering Equipment and Technology    2023, 10 (3): 1-12.   DOI: 10.12087/oeet.2095-7297.2023.03.01 Abstract （1077）      PDF（pc） （8344KB）（2282）       Knowledge map    Save With the development trend of large-scale and ocean-going offshore wind farms, the demand for large-scale offshore converter stations will continue to increase, and their installation problems will gradually receive attention. In this paper, taking the SanXia Rudong offshore converter station as an example, a multi-body dynamic model is established by OrcaFlex software to numerically calculate the transportation and floatover installation process of the converter station, and the motion, acceleration and mooring line force of the barge and converter station in some stages are analyzed. The results show that during the transportation stage, when the significant wave height is the same, the motion amplitude and acceleration of the barge-converter station system increase correspondingly with the increase of the spectral peak period Tp (6~9s), but they are basically within the limit value. During the installation stage, the spectral peak period Tp = 8s at the same wave height will cause greater surge, sway, and yaw motion amplitudes than Tp = 6s and 10s, and more attention should be paid to such working conditions. In addition, head sea conditions are more conducive to the floatover operation. Besides, the risk research of the converter station transportation stage is carried out, and effective risk control measures are proposed to provide a certain reference for the actual large-scale offshore converter station installation operation. Related Articles | Metrics | Comments（0）

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Construction Technology of Large Deep water Suction Anchors  CHEN Xin, ZHAO Xiaolei, WANG Likun, XIAO Deming, ZHANG Tengyue Ocean Engineering Equipment and Technology    2022, 9 (1): 32-36.   DOI: 10.12087/oeet.2095-7297.2022.01.06 Abstract （1073）      PDF（pc） （2517KB）（1375）       Knowledge map    Save Related Articles | Metrics | Comments（0）

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Research on Key Technologies of Dynamic Analysis and Numerical Simulation for the Floating Offshore Wind Turbine QU Xiaoqi, LI Hongtao, TANG Guangyin, DU Haiyue, YANG Linlin Ocean Engineering Equipment and Technology    2023, 10 (2): 72-78.   DOI: 10.12087/oeet.2095-7297.2023.02.12 Abstract （1022）      PDF（pc） （8230KB）（2226）       Knowledge map    Save With the development of floating offshore wind turbine technology, engineering projects of large scale floating offshore wind turbine has begun to emerge. Because manufacturers keep the parameters of wind turbine confidential, there are many challenges in numerical simulation analysis of floating offshore wind turbines in practical engineering projects. In this paper, the key technologies on numerical simulation of floating wind turbine in the practical engineering project was studied. Through the equivalent thrust model, a numerical model of real floating wind turbine was established and the dynamics responses under a typical load case was analyzed. Based on the research results of this study, the difficulties in establishing the numerical model of floating wind turbine in practical engineering projects can be well solved. This is of great significance to promote the technical development and accelerate the commercialization of China's floating wind turbine industry. Related Articles | Metrics | Comments（0）

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Layout Design of Subsea Production System Drill Center WANG Hui-feng, ZHANG Fei, XIONG Jing-chang, LI Gang, LI Li-na Ocean Engineering Equipment and Technology    2018, 5 (2): 86-90.   DOI: 10.12087/oeet.2095-7297.2018.02.02 Abstract （985）      PDF（pc） （3556KB）（329）       Knowledge map    Save The drill center of subsea production system refers to the subsea wellhead and the surrounding access facilities. The layout design of drill center is an important part of the engineering of subsea production system. It mainly includes subsea wellhead and manifold layout, subsea pipeline approaching layout, flying lead layout, etc. We introduce the principle and design considerations of subsea production system drill center layout. Especially, for a South China Sea gas field, the drill center layout design considerations and design methods are illustrated, embodying the system design rationality. Related Articles | Metrics | Comments（0）

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Study on Manufacturing Process of Lashing Bridge  on  21 000 TEU Ultra Large Container Ship JIANG Xiao, MA Tao, YUAN Bo, ZHOU Rui-jia Ocean Engineering Equipment and Technology    DOI: 10.12087/oeet.2095-7297.2018.05.11

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Research on integration lifting technology of J-tube of offshore booster station jacket FENG Yinglei Ocean Engineering Equipment and Technology    2023, 10 (3): 57-64.   DOI: 10.12087/oeet.2095-7297.2023.03.08 Abstract （940）      PDF（pc） （11685KB）（184）       Knowledge map    Save As offshore wind power gradually moves towards the deep sea, the size and weight of offshore booster station jackets are also getting larger. The number of cable protectors of the offshore booster station jackets is large, making installation difficult. If use the installation method of traditional oil and gas jacket’s J-tube, the project duration and cranes will be greatly affected. This paper discusses an integration lifting technology of J-tube and structural piece,which lifts the J-tube and structure in place at the same time, and checks the structural strength and local strength of lifting points under different working conditions. Provide technical basis for construction of wind power technology to break through in deep sea areas. Related Articles | Metrics | Comments（0）

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Challenge and Solution of Subsea Umbilical Termination Unit Design in Wenchang 10-3 Project ZHONG Wen-jun, FANG Wei, GU Yong-wei Ocean Engineering Equipment and Technology    2018, 5 (2): 143-148.   DOI: 10.12087/oeet.2095-7297.2018.02.13 Abstract （929）      PDF（pc） （3894KB）（341）       Knowledge map    Save Based on the design experience of subsea umbilical termination unit (SUTU) in Wenchang 10-3 project, the challenges and relevant technologies, which focus on the system integration design and characteristics of supply equipment, are analyzed and summarized. The SUTU system design was completely controlled by foreign supplier before. The design mode adopted in Wenchang 10-3 project will improve our independent research and development capacities, reinforce the localization of technical reserves, and provide a good basis for the future deepwater oil and gas development. Related Articles | Metrics | Comments（0）

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Application of SmartPlant Spoolgen Combined with CMS in Pipeline Fabrication Design of Offshore Oil Engineering Jiang-hui YANG, Yong-chun XIE, Guang DU, Xiao-hua JIANG, Xiao-gang ZHANG, Geng XU, Jia WANG Ocean Engineering Equipment and Technology    2014, 1 (3): 258-262.   Abstract （929）   HTML （2）    PDF（pc） （4332KB）（471）       Knowledge map    Save With the technological developments of offshore platform and modularization factory, process pipelines become more and more complex, and account for an increasingly high proportion. How effectively the three-dimensional (3D) model data are transferred to the fabrication design has become a common problem. Traditionally, computer-aided design (CAD) software is used for pipe cutting, but because this method has low work efficiency and cannot avoid manual errors, it is not able to meet the requirements of short construction period and strict material control. We introduce a new method for pipeline breaking using the Spoolgen software, and briefly give the spool precast management workflow performed with construction management system (CMS). This research will provide reference for the fabrication design of offshore oil platform and modularization factories. Table and Figures | Reference | Related Articles | Metrics | Comments（0）