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Review on the Development and Research on Magnetic Flux Leakage Detection Technology LI Bailin Ocean Engineering Equipment and Technology    2025, 12 (2): 179-182.   DOI: 10.12087/oeet.2095-7297.2025.02.37 Abstract （525）      PDF（pc） （1490KB）（320）       Knowledge map    Save Magnetic flux leakage (MFL) detection technology， renowned for its high reliability and non-contact detection capabilities， is widely applied in safety detections of petrochemical storage tanks and pipelines. Firstly， the theoretical development and technical principles of MFL detection are introduced. Then， the research status of defect identification， quantitative analysis， and inversion methodologies in MFL technology are explained in detail. Finally， a summary is provided， highlighting the challenges faced by current artificial intelligent methods in this field. Related Articles | Metrics | Comments（0）

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Mapping the Research Frontiers of Global Marine Engineering (2015-2024): A Journal-Based Knowledge Graph Approach PAN Fei, WANG Xiaolong, CAI Yunze, et al Ocean Engineering Equipment and Technology    2025, 12 (3): 132-144.   DOI: 10.12087/oeet.2095-7297.2025.03.18 Abstract （325）      PDF（pc） （3336KB）（254）       Knowledge map    Save Ocean engineering serves as a cornerstone for maritime power strategies and global sustainable development. To systematically reveal the research landscape, innovation entities, and frontier evolution in global ocean engineering, this study conducts an in-depth analysis of 37889 publications from 2015 to 2024 based on the Web of Science Core Collection, employing bibliometric methods and knowledge graph analysis. The findings demonstrate: ① A fundamental shift in the global research center of gravity has occurred, with China emerging as the world's primary innovation contributor across key indicators including publication volume and citation impact—its annual publication share surged from 20.9% in 2015 to 60.1% in 2024; ② Innovation entities exhibit highly clustered characteristics, with leading Chinese universities such as Harbin Engineering University and Shanghai Jiao Tong University monopolizing the top 10 global institutional rankings, forming world-class “academic highlands”; ③ Through keyword co-occurrence and cluster analysis, seven frontier themes were identified, including marine renewable energy development, intelligent autonomous marine systems, highfidelity multi-physics simulation, and marine environmental sensing and data science, revealing that the field is being profoundly reshaped by trends of “intelligentization” “decarbonization” and “high-fidelity modeling”; ④ The journal influence landscape has been restructured, with the Chinese-hosted Journal of Ocean Engineering and Science achieving the highest impact factor (11.8) in the field, though platforms for global dissemination of top-tier research require further expansion. Finally, this study establishes a framework for modern ocean engineering frontiers centered on “sustainable & intelligent ocean engineering” supported by “three foundational pillars” and driven by “four enabling engines”. The research reveals China's historic transition from “follower” to “leader” in ocean engineering, provides researchers with a clear developmental roadmap, and profoundly elucidates the strategic urgency of building world-class scientific journals to secure academic discourse power and enhance national scientific soft power. Related Articles | Metrics | Comments（0）

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Design of Ship Model Resistance Experiment Platform SHI Kunpeng, ZHENG Yuxing, TIAN Yutao, et al Ocean Engineering Equipment and Technology    2025, 12 (3): 1-10.   DOI: 10.12087/oeet.2095-7297.2025.03.01 Abstract （246）      PDF（pc） （3698KB）（192）       Knowledge map    Save The study of hull resistance is of great significance to the dynamic characteristics of the hull. Currently， there are more than ten large and small towing tank experimental platforms in China. For undergraduate students majoring in marine engineering， studying the resistance characteristics of the hull is of great importance to their professional knowledge learning. However， the construction cost of towing tanks is too high and cannot provide a good platform for undergraduate students to use. An easy-to-implement experimentalplatform construction plan， covering modelship building, platform design and resistance-accuracy verification， offers valuable learning and experimental experience for undergraduates. Related Articles | Metrics | Comments（0）

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Discussion on Regular Inspection Technologies for Submarine Pipelines SU Tianshui, LIAO Hengjie, HUANG Panyang Ocean Engineering Equipment and Technology    2025, 12 (3): 118-122.   DOI: 10.12087/oeet.2095-7297.2025.03.15 Abstract （287）      PDF（pc） （5619KB）（173）       Knowledge map    Save Subsea pipelines are critical infrastructure for transporting offshore oil， gas， and other resources， and their safety is vital to the marine economy and environment. This paper provides an overview of the construction and inspection status of subsea pipelines along the coast of Zhejiang Province， with a focus on external pipeline inspection technologies and methods. Taking the key area of Huibieyang in Zhejiang as an example， it analyzes and highlights that pipeline inspection should be tailored to different marine environments. Related Articles | Metrics | Comments（0）

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Vertical-lay Technology and Application for Ultra-Deep Water Flexible Flowline WANG Zhifeng, XUE Dazhi, FU Wenzhi, et al Ocean Engineering Equipment and Technology    2025, 12 (3): 30-38.   DOI: 10.12087/oeet.2095-7297.2025.03.04 Abstract （212）      PDF（pc） （10497KB）（160）       Knowledge map    Save Flexible flowline is an important part of offshore oil and gas development， and its offshore installation is the core ability and key technology of offshore engineering companies. Based on China's first self-developed 1500m ultra-deep water Lingshui 17-2 gas field， and the domestic first 3000m-class deep-water MSV “Hai yang Shi You 286”， the installation feasibility of 1500m water depth flexible flowline by vertical-lay method for “HYSY 286” is evaluated. The key technology and solution of vertical-lay of ultra-deep water flexible flowline are studied. Through the engineering application in Lingshui 17-2 gas field， the feasibility of the relevant technology is verified， and the gap in domestic technology field is filled， and the technical reserve and experience are provided for the installation of deep water flexible flowline in the future. Related Articles | Metrics | Comments（0）

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Exhibition of Modern Model Making Technology Based on the Model Making of 093 Nuclear Submarine SHOU Hai, TIAN Yutao, ZHANG Shutian, et al Ocean Engineering Equipment and Technology    2025, 12 (3): 11-21.   DOI: 10.12087/oeet.2095-7297.2025.03.02 Abstract （316）      PDF（pc） （6851KB）（158）       Knowledge map    Save Taking the 093 model production as a starting point, this paper conducts an in-depth analysis of modern model making technologies. Through a detailed elaboration of the production process of 093 nuclear submarine model， including precise digital design using 3D modeling software in the early stage to determine the accurate proportion， suitable size and select appropriate materials， the use of 3D printing technology for rapid prototyping and fine model manufacturing， and the later processing procedures such as surface cleaning， polishing and coating protection， the characteristics and advantages of modern model-making techniques in digitalization， automation， material application and fine processing are comprehensively demonstrated. At the same time， the key role of this technology in improving the efficiency of model production， enhancing the reducibility and precision of models， as well as its application prospects and development trends in the field of model making are discussed， providing a useful reference for in-depth understanding of modern model-making techniques. Related Articles | Metrics | Comments（0）

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Design and Fabrication of a Compact Brushed Electromagnetic Catapult Based on Halbach Array ZHANG Shutian, GUO Sixing, LI Jiaqiang, et al Ocean Engineering Equipment and Technology    2025, 12 (3): 22-29.   DOI: 10.12087/oeet.2095-7297.2025.03.03 Abstract （360）      PDF（pc） （7220KB）（156）       Knowledge map    Save A compact brushed electromagnetic catapult was designed and fabricated， with focused analysis on its operational principle， structural design， and performance parameters. By investigating the electromagnetic driving characteristics of the catapult system， the key factors influencing launch efficiency are explored. Additionally， the advantages of the system in high-precision control and energy conversion efficiency are experimentally validated. The results demonstrate that the proposed electromagnetic catapult exhibits rapid response speed， high reliability， and ease of maintenance. This work provides a reference for the miniaturized design of future electromagnetic catapult systems. Related Articles | Metrics | Comments（0）

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Simulation and Experimental Study on Yawing Motion Characteristic for Single-Anchor Mooring Ships CHEN Pengyu, ZHU Yiming, XIE Xiaomin Ocean Engineering Equipment and Technology    2025, 12 (3): 87-93.   DOI: 10.12087/oeet.2095-7297.2025.03.11 Abstract （234）      PDF（pc） （6276KB）（156）       Knowledge map    Save The numerical simulation and model test study is conducted on yawing motion characteristic for the 40000 DWT bulk carrier under the combined conditions of wind， wave and current cases. This research analyzed the response of yawing motion and maximum cable tension of anchor chains. Sea condition and length of anchor chains could have influence on them. The test results can provide important technical reference for the safety mooring of single anchored ships. Related Articles | Metrics | Comments（0）

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Mechanical Characteristics of Deepwater Riserless Mud Return Line Under Internal Flow Induced Excitation YIN Zhiming, LI Zhong, WU Di, et al Ocean Engineering Equipment and Technology    2025, 12 (3): 39-50.   DOI: 10.12087/oeet.2095-7297.2025.03.05 Abstract （251）      PDF（pc） （7734KB）（154）       Knowledge map    Save The mud return line is the key equipment of deepwater riserless drilling system. It is filled with high flow velocity mud， and the mechanical characteristics of mud on the line are not clear. The mechanical model of the mud return line under the combined action of internal and external flow was established by using the microelement method， considering the internal flow inertia force， friction force， centrifugal force and Coriolis force. The numerical model was established by using the finite element method， and the solver developed by Newmark-β method and MATLAB. The single effect and the combined effect of the internal flow force are analyzed， and the influence of mud flow rate， mud density and other factors on the internal flow mechanical characteristics is also studied. The result shows that the inertia force increases the vibration amplitude of the return line， riction decreases the lateral displacement of the return line， centrifugal force and Coriolis force increase the lateral displacement of the return line. The internal flow force has great influence on the return line， and the friction force has the greatest influence on the mud return line. The effects of inertia force， Coriolis force and centrifugal force are small. The effect of internal mud on the return line should be considered in the actual engineering analysis. Related Articles | Metrics | Comments（0）

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Research on Installation Technology of Composite Cables for Newly Constructed Deepwater Jackets WANG Minfeng, WEI Xumin, XU Long, et al Ocean Engineering Equipment and Technology    2025, 12 (3): 51-57.   DOI: 10.12087/oeet.2095-7297.2025.03.06 Abstract （285）      PDF（pc） （11076KB）（151）       Knowledge map    Save Offshore pile foundation fixed oil platforms are the main structural form of offshore oil production in China. At present， the tension type external current cathodic protection technology has become the main technical means of cathodic protection for offshore pile foundation fixed jacket platforms. The newly built jacket platform adopts the method of installing a tensioned composite cable electrode system on land， but facing the design height of 338 meters of jacket， it is a huge challenge to install a composite cable about 340 meters long and weighing about 3.5 tons during its horizontal construction process， and there are no relevant research results or industry experience to draw on. In order to solve this problem， this article proposes a static sliding cable composite cable installation method for installation testing. Based on mechanical calculations and 3D simulation， video monitoring， and dynamic monitoring of the actual process of the composite cable， the actual monitoring data is comprehensively compared with theoretical calculation data and onsite test data. The focus is on studying the stress state of the steel wire rope sliding cable and traction steel wire rope during the installation process of the composite cable， the local deflection and overall deflection of the composite cable， and the change law of the composite cable motion posture during the installation process， to verify the feasibility of the impressed current cathodic protection （ICCP） composite cable sliding cable installation scheme for deepwater horizontal jackets. Related Articles | Metrics | Comments（0）

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Safety Management of Work at Height in Offshore Engineering Manufacturing Industry LUO Mengran, WANG Qinggong, YU Minggan Ocean Engineering Equipment and Technology    2025, 12 (3): 79-86.   DOI: 10.12087/oeet.2095-7297.2025.03.10 Abstract （699）      PDF（pc） （9952KB）（151）       Knowledge map    Save Due to the specific manufacturing processes in offshore engineering， work at height is highly prevalent， particularly during the assembly phases of large structures such as modules and jackets， where the frequency of work at height and multi-level crossover operations， as well as the potential fall height， are continuously increasing. This paper provides a classified review of current domestic and international research on work-at-height safety. It systematically examines the definition and identification criteria of work at height and proposes comprehensive preventive measures based on domestic and international regulatory standards and engineering practices. These measures encompass multiple aspects， including engineering technology， management， personnel， and physical protection. To ensure the inherent safety of scaffolding， the paper discusses different types of scaffolding and their selection during construction， aiming to provide a safety management framework for work at height in the offshore engineering manufacturing industry. This framework is designed to effectively reduce accident rates and ensure operational safety. Related Articles | Metrics | Comments（0）

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Study on the Internal Detection Method of a Platform Riser in the South China Sea CAO Juhang, YU Yuanfang, ZHANG Jie, et al Ocean Engineering Equipment and Technology    2025, 12 (3): 58-66.   DOI: 10.12087/oeet.2095-7297.2025.03.07 Abstract （177）      PDF（pc） （8592KB）（148）       Knowledge map    Save Based on the background of the internal inspection project of a 12.75-inch production riser on a South China Sea platform， the standards and specifications for pipeline internal inspection were systematically organized. The inspection objectives， methods， precision， and parameters for evaluating the remaining strength of corrosion were established. Using ultrasonic internal inspection equipment， a comparative analysis was conducted between the conventional in-line inspection method based on water driving and the pulling through method. It was found that the operation time of the pulling through method was only 23% of that of the water driving method. Based on the preliminary assessment of internal cleanliness and corrosion conditions obtained through pipeline CCTV system， the ultrasonic pulling through internal inspection solution was employed to conduct wall thickness testing and corrosion evaluation of the offshore riser， identifying defect information where corrosion depth exceeded 10% of the wall thickness. According to the corrosion evaluation index of ASME 31G， the estimated repair factor of the riser defect location was obtained， and a riser repair plan was formulated， providing a reference for subsequent similar inspections. Related Articles | Metrics | Comments（0）

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Fatigue Life Analysis of Steep-Waveform Flexible Riser with Full Coupling FENG Meng, Liu Xinghua, YANG Shuai, et al Ocean Engineering Equipment and Technology    2025, 12 (4): 133-140.   DOI: 10.12087/oeet.2095-7297.2025.04.17 Abstract （246）      PDF（pc） （6251KB）（148）       Knowledge map    Save During the long-term service of flexible risers， problems such as permeation in the annular layer and interlayer friction may occur. Under alternating loads， the fatigue damage of the tensile armor wire will accelerate. This paper conducts a safety assessment for steep-waveform flexible risers. By establishing a global-local-failure finite element model that takes into account interlayer friction and corrosion effects， the dynamic response and fatigue life of the flexible risers under the full coupling model are mainly studied. The results show that both interlayer friction and corrosion effects will affect the in-service life of the flexible risers. Interlayer friction mainly increases the stress amplitude of the tensile armor wire， while the corrosion effect not only reduces the cross-sectional size but also requires the selection of the corresponding S-N curve due to the presence of the corrosive environment. The corrosion effect has a greater impact on the fatigue life. Therefore， when conducting in-service riser assessment， interlayer friction and corrosion fatigue issues should be fully considered， and effective measures should be taken to manage the integrity of the flexible risers. Related Articles | Metrics | Comments（0）

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Economic Analysis of Green Hydrogen and Its Derivatives Production Technology Based on Offshore Wind Power SHEN Qi, LIU Chao, LI Ouping, et al Ocean Engineering Equipment and Technology    2025, 12 (3): 94-101.   DOI: 10.12087/oeet.2095-7297.2025.03.12 Abstract （371）      PDF（pc） （3148KB）（144）       Knowledge map    Save As the global energy structure transforms and the “dual-carbon” goals are set， green hydrogen is gaining importance as a clean energy source in the petroleum refining industry. This study comprehensively assesses the technical and economic viability of producing green hydrogen， methanol， and ammonia using offshore wind power. By calculating the costs of hydrogen production， methanol synthesis， and ammonia synthesis under varying electricity costs， the study analyzes how electricity prices affect the economic viability of green hydrogen and its derivatives. The results indicate that when the electricity cost is 0.35 yuan per unit， the current alkaline electrolysis hydrogen production technology yields a hydrogen cost of 24.66 yuan/kg in the scenario of offshore wind power and onshore hydrogen production， with methanol and ammonia production costs of 5457.55 yuan/ton and 4999.43 yuan/ton， respectively. The study emphasizes that electricity cost is the key factor influencing economic viability. Reducing renewable energy electricity costs and enhancing electrolysis efficiency are crucial for boosting the competitiveness of green hydrogen and its derivatives. Finally， the article proposes suggestions for the coordinated development of policies， technologies， and industries to promote the industrialization of green hydrogen and its derivatives. Related Articles | Metrics | Comments（0）

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Research on the Identification of Technological Opportunities in Marine New Materials in China LIU Hongyu, WU Dajian Ocean Engineering Equipment and Technology    2025, 12 (3): 123-127.   DOI: 10.12087/oeet.2095-7297.2025.03.16 Abstract （492）      PDF（pc） （4127KB）（143）       Knowledge map    Save This study explores technological opportunities in China's marine new materials field based on patent mining. Patent data were analyzed across trends， authorization， regions， and lifecycle， and keyword clustering was used to identify hotspots. Results show the field is transitioning from growth to maturity， focusing on composites， molding， and green materials， with future directions in intelligent and multifunctional systems. Strategic suggestions are proposed to guide innovation and planning. Related Articles | Metrics | Comments（0）

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APS Migration Studies in Large Marine Structures LI Wenwu, LIU Xiuhong, QIAN Peng, et al Ocean Engineering Equipment and Technology    2025, 12 (3): 73-78.   DOI: 10.12087/oeet.2095-7297.2025.03.09 Abstract （271）      PDF（pc） （8709KB）（141）       Knowledge map    Save To address the bottleneck issues of high skidway resource occupancy and poor project scheduling flexibility in traditional skidway traction methods for 10000-ton-class deepwater oil and gas platform modules， this study introduces the mature skidway-free air pad sliding （APS） transportation technology from the shipbuilding industry. Based on application practices in South Korean shipyards， a technical solution integrating air-cushion suspension and hydraulic propulsion systems was systematically developed. By incorporating multi-stage hydraulic jacking devices and path control systems， millimeter-level precision transportation of modules weighing up to 30000 tons was achieved. Engineering validation demonstrated that the APS system reduced skidway resource requirements by 100%， improved project scheduling flexibility by 60%， and shortened transportation cycles by 40%. This research represents the first successful adaptation of APS technology to the offshore engineering sector， establishing a comprehensive skidway-free construction and transportation methodology. The findings provide an innovative solution for China's deepwater oil and gas equipment construction， effectively overcoming the rigid dependence on skidway resources for ultra-large structure transportation. Related Articles | Metrics | Comments（0）

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Design of Optical Fiber Communication System for Subsea Production System Based on Ring Topology ZHANG Yan, SUN Qin Ocean Engineering Equipment and Technology    2025, 12 (3): 67-72.   DOI: 10.12087/oeet.2095-7297.2025.03.08 Abstract （247）      PDF（pc） （3580KB）（140）       Knowledge map    Save An optical fiber communication system based on ring topology is proposed for the development of subsea oil and gas fields reconnecting to the existing facilities with limited resources reserved fiber cores， which is based on the efficient utilization rate of optical fiber resources and the superior scalability of topology based on ring topology， and only 4-core fibers are needed for a single loop， which can effectively solve the problem of limited optical fiber resources， and the system has superior expansion ability. Then， the scheme design of the system is carried out， and the standards and methods of the communication verification and practical application case are given， Finally， based on the characteristics of different projects of the subsea production system， the applicability of the star topology and the ring topology is analyzed， which provides a reference for the communication scheme design of the subsea production system. Related Articles | Metrics | Comments（0）

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Application of an Energy-Aware A* and APF Hybrid Algorithm in Collision Avoidance Path Planning for Autonomous Buoys WANG Bo, WANG Lei, JIANG Weidong Ocean Engineering Equipment and Technology    2025, 12 (3): 102-111.   DOI: 10.12087/oeet.2095-7297.2025.03.13 Abstract （201）      PDF（pc） （14390KB）（138）       Knowledge map    Save The emergence and development of mobile aids to navigation （MAtoN） have a promoting effect on the progress of maritime science and technology. As a type of MAtoN， autonomous buoys have great development prospects. However， due to energy constraints， autonomous buoys must minimize energy consumption as much as possible during navigation to extend their working cycle. Therefore， a path planning algorithm that can be more energy-efficient is needed. This paper proposes a hybrid algorithm of energy-aware A* and artificial potential field （APF）. The global path planning of autonomous buoys is carried out by using the energy-aware A* algorithm. Based on the traditional A* algorithm， the energy perception ability is added， an energy consumption model is established， then a route with lower energy consumption is planned， and a time costiten is introduced to control the navigation time of the autonomous buoy. The APF algorithm is added for local motion planning to locally control the motion path of the autonomous buoy and avoid collisions. This paper verifies the superiority of the energy-aware A* algorithm through simulation. By introducing the APF algorithm， a hybrid planning algorithm is formed， achieving real-time collision avoidance planning for autonomous buoys. Most of the existing A*-APF hybrid algorithms are designed for robots， unmanned surface vehicles， etc.， and are not suitable for the actual path planning of autonomous buoys with strong energy limitations. In contrast， this hybrid algorithm emphasizes energy-aware ability and is more suitable for application in the actual path planning of autonomous buoys. The application of this algorithm in the design of autonomous buoys can promote the development of autonomous buoy applications and has positive significance for enhancing maritime scientific and technological strength. Related Articles | Metrics | Comments（0）

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Study on RSV Ethane Liquefaction Process for Preventing CO2 Freezing and Plugging SU Tianshui, SHEN Peng, JI Aoqi, et al Ocean Engineering Equipment and Technology    2025, 12 (3): 112-117.   DOI: 10.12087/oeet.2095-7297.2025.03.14 Abstract （246）      PDF（pc） （4249KB）（136）       Knowledge map    Save A natural gas processing plant with a capacity of 6×106m3/d plans to adopt the recycle split-vapor （RSV） process to recover liquefied ethane. CO2 freezing and plugging in the demethane tower is a key technical bottleneck affecting the stable operation. With the goal of improving the ethane yield， according to the selection of liquefied ethane process for natural gas production and the formation mechanism of CO2 freeze blockage， the CO2 distribution and temperature of each tower plate of each tower plate under different CO2 contents were simulated. Through the simulation curve comparison analysis， the conclusion was concluded that when the CO2 content of the raw gas in the cold box was less than 5×10-5， the demethanizer would not freeze blockage. According to the analysis of different decarbonization processes， the alcohol amine method is selected to remove CO2 to meet the process requirements. The research results show that by using PZ+MDEA solution to remove CO2 from raw natural gas， the problem of freezing and blocking of CO2 in the deep cold zone between -90℃ and -105℃ can be effectively solved， and the ethane yield can reach more than 95%. Related Articles | Metrics | Comments（0）

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Analysis of the Influence of Vibration-Blocking Mass on Vibration Transmission Performance of Marine Auxiliary Machinery MAO Liang, SHOU Jianlin, LIU Xuchen Ocean Engineering Equipment and Technology    2025, 12 (3): 128-131.   DOI: 10.12087/oeet.2095-7297.2025.03.17 Abstract （196）      PDF（pc） （3729KB）（136）       Knowledge map    Save Adding a blocking mass between the base web and the deck surface is an effective means to curb the transmission of ship auxiliary machinery vibration to the hull structure. This study aims to investigate the vibration transmission of auxiliary pumps， focusing on the blocking mass as the research object. The finite element method was employed to systematically analyze the influence of parameters such as the geometric characteristics， material properties， and structural configuration of the blocking mass on the vibration transmission of marine auxiliary machinery. Simulation results demonstrated that increasing the size of the blocking mass and adopting a rational configuration can both significantly reduce vibration transmission. Considering the requirement for lightweight design， a novel squareframe-shaped blocking mass structure is proposed. Related Articles | Metrics | Comments（0）

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Technical Scheme for Methanol Bunkering Ship PENG Cheng, WU Hao, XIA Huabo, YANG Xueli, ZHAO Yunfei, WU Fulong Ocean Engineering Equipment and Technology    2025, 12 (2): 1-7.   DOI: 10.12087/oeet.2095-7297.2025.02.01 Abstract （185）      PDF（pc） （4216KB）（135）       Knowledge map    Save In response to the domestic demand for ship to ship methanol refueling operations， the methanol ship to ship refueling market is planned in advance. By conducting research on the construction and renovation of methanol refueling ships， the technical solutions for refueling ships that can cover the vast majority of methanol powered ship refueling needs are reserved to assist in the construction of the methanol international refueling center. Related Articles | Metrics | Comments（0）

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Fatigue Analysis Affected by Out-of-Plane Bendingfor Mooring Chain of a Floating Offshore Structure ZHANG Lin, ZHANG Bin, SHI Hemu Ocean Engineering Equipment and Technology    2025, 12 (2): 166-172.   DOI: 10.12087/oeet.2095-7297.2025.02.35 Abstract （216）      PDF（pc） （5295KB）（135）       Knowledge map    Save A fracture mechanics based approach for offshore mooring fatigue assessment was developed. Then both S-N curves and fracture mechanics based fatigue analysis for the mooring system of a floating offshore structure were carried out. The low frequency and the wave frequency load processes were regarded as two random load processes for calculating the tensions along mooring lines excited by motions of low frequency and wave frequency. The dual narrow band method was then performed for combining the mooring line tension ranges， and the fatigue damage of mooring lines was estimated by both S-N curves and fracture mechanics based approaches. A comparison between S-N curves based fatigue assessment approaches and the developed fracture mechanics based mooring fatigue assessment approach was made， and the results showed that fatigue lives estimated by these two approaches were generally comparable if the safety factors suggested by DNV were applied to S-N curves based approaches. The developed fracture mechanics based mooring fatigue assessment approach was then applied for mooring chain links subjected to out-of-plane bending （OPB）. The result showed that the fatigue life of mooring chains on 5， 7 and 9 pocket sprockets affected by out-of-plane bending was reduced by 19%， 11% and 9% respectively. Related Articles | Metrics | Comments（0）

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Research on Fatigue Life Assessment Methods for Mooring Systems under Seasonal Load Effects LIU Shixue Ocean Engineering Equipment and Technology    2025, 12 (2): 156-161.   DOI: 10.12087/oeet.2095-7297.2025.02.33 Abstract （228）      PDF（pc） （4250KB）（129）       Knowledge map    Save The mooring system of a floating production storage offloading (FPSO) unit is crucial for its stable positioning at sea. Given that the mooring system must endure complex marine conditions over decades of service， component fatigue becomes a critical factor affecting its safety and reliability. This paper aims to study the fatigue life assessment methods for mooring systems， taking into account the characteristics of seasonal loads. Initially， based on actual monitoring data， we conducted research on fatigue life assessment methods for mooring systems. Through an in-depth analysis of long-term wind， wave， and current data in a specific area of the South China Sea， we discovered that the environmental loads in this region exhibit significant seasonal variation patterns， which are vital for accurately assessing the fatigue life of mooring system components. Therefore， this paper incorporates seasonal load characteristics into the fatigue life assessment model to more accurately simulate actual sea conditions and evaluate fatigue life. Using an FPSO in the South China Sea as a case study， the analysis results indicate that the fatigue life of the mooring chains from Line 1 to Line 4 is significantly lower than that of other mooring chain groups. This finding underscores the importance of considering load seasonal characteristics in mooring chain fatigue assessments， providing essential reference points for future engineering operations and maintenance. Related Articles | Metrics | Comments（0）

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Analysis and Treatment of Ignition Fault of FPSO Hot Medium Boiler SHAO Shifa, ZHANG Ning Ocean Engineering Equipment and Technology    2025, 12 (2): 21-25.   DOI: 10.12087/oeet.2095-7297.2025.02.05 Abstract （183）      PDF（pc） （6172KB）（128）       Knowledge map    Save This paper mainly introduces the ignition control theory of hot medium boiler of an offshore floating production  storage offloading (FPSO)， as well as some problems that may cause boiler ignition failure in daily maintenance and operation， and makes corresponding solutions according to the problems encountered. This paper introduces the related transformation of boiler on ignition problems and puts forward some equipment maintenance plans and improvement measures in view of the easy problems. Related Articles | Metrics | Comments（0）

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Finite Element Analysis and Monitoring Scheme Design for the MCM of a Submerged Turret Production Single-Point Mooring System LIU Yixiang, LI Peng, LIU Jiannan, WANG Kun, SHI Hemu Ocean Engineering Equipment and Technology    2025, 12 (2): 120-126.   DOI: 10.12087/oeet.2095-7297.2025.02.26 Abstract （456）      PDF（pc） （10412KB）（127）       Knowledge map    Save The submerged turret production (STP) single-point mooring system operates in an environment subjected to the combined effects of mooring forces， wind， waves， and currents. Through contact with structures such as the buoyancy and mating cone module (MCM)， it transfers the impact of these loads to the hull. Under the prolonged influence of alternating loads， the MCM is prone to fatigue issues at positions where structural stress is concentrated， potentially leading to crack initiation; under extreme wind and wave conditions， there may even be a failure of structural ultimate strength， rendering the floating production storage offloading (FPSO) unable to operate normally. Therefore， developing a design for a multi-parameter monitoring and early warning system that is safe， reliable， and stable for the STP single-point system is crucial for ensuring the normal， steady， and secure operation of the FPSO. This paper focuses on the MCM of a certain FPSO， conducting structural finite element analysis to calculate the stress distribution state of the MCM structure under working conditions， identifying high-stress locations in critical areas， and providing recommendations for sensor placement schemes. This lays the groundwork for developing a monitoring and early warning system for the STP single point and arranging stress sensors. Related Articles | Metrics | Comments（0）

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Optimization of the Crude Oil Cooler for “Hai Yang Shi You 123” FPSO WENG Xi, TAN Jingxuan, ZHOU Yong, ZHANG Wei Ocean Engineering Equipment and Technology    2025, 12 (2): 136-139.   DOI: 10.12087/oeet.2095-7297.2025.02.29 Abstract （502）      PDF（pc） （6199KB）（126）       Knowledge map    Save The “Hai Yang Shi You 123”FPSO crude oil cooler is a plate heat exchange, which normally operates with one in use and one as backup. As the oil production in the oilfield gradually increases， the load on the crude oil cooler gradually increases， resulting in poor heat exchange efficiency. Through physical property analysis of oilfield crude oil， the main reason for the poor heat exchange effect of the cooler is that the crude oil has a high wax content， a high wax precipitation point， and severe wax deposition on the side plate wall of the crude oil， which reduces the heat exchange capacity between the crude oil and seawater. To efficiently solve this problem， a comprehensive analysis was conducted on the equipment structure and process status of the crude oil cooler. A creative idea was proposed to optimize the two coolers into series operation， the application effect of the cooler series connection was verified on site， providing a reference for the stable operation of FPSO in the future. Related Articles | Metrics | Comments（0）

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Feasibility Analysis of Layered Water Injection Assisting Flow in Thin Interbedded Oil Fields of Strong Water Bodies CHEN Xueli, WANG Li, ZHANG Ruigang Ocean Engineering Equipment and Technology    2025, 12 (2): 117-119.   DOI: 10.12087/oeet.2095-7297.2025.02.25 Abstract （379）      PDF（pc） （1877KB）（125）       Knowledge map    Save Water injection in offshore thin interbedded oil fields is a great challenge because of its high cost and difficulty in construction. Through long-term research and practice， separated layer self-source enclosed water injection technology is put forward to supplement energy. Based on the characteristics of offshore oil fields， the screening principles of target layer， water source layer and pilot water injection well group are formulated. We developed self-source enclosed injection pipe string and underground data monitoring system， such as measuring and adjusting， water quality monitoring， etc.， and has the huge advantages of multi-purpose in one well， low cost， green energy saving and quick effect. This technology can reduce costs related to drilling， platform facilities and surface water injection facilities， and effectively reduce water corrosion and reservoir damage. It has a wide range of reference and promotion significance in similar thin interbedded water injection oilfields offshore. Related Articles | Metrics | Comments（0）

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Analyzing the Key Techniques and Safety Measures for Steel Structure Hoisting in Construction Engineering ZHOU Zhenyong, LIU Yiqiang Ocean Engineering Equipment and Technology    2025, 12 (2): 107-110.   DOI: 10.12087/oeet.2095-7297.2025.02.23 Abstract （463）      PDF（pc） （2067KB）（124）       Knowledge map    Save The quality of steel structure construction and the overall stability of these structures are crucial for ensuring the safe and efficient progression of construction projects， given the significant role that steel structures play in such undertakings. To enhance the efficacy of various technologies employed during the lifting operations of steel structures within buildings， it is imperative to adopt appropriate techniques. This approach will help uphold rigorous standards concerning both the quality of lifting procedures and structural integrity. Furthermore， it is essential to implement robust measures that strengthen safety protocols during steel structure lifting activities in construction projects， effectively manage potential safety risks associated with these operations， and ultimately facilitate a secure and rational advancement of practices related to steel structure lifting. Related Articles | Metrics | Comments（0）

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The Green Upgrade Route of a Fleet Based on IMO GHG Reduction Strategy ZHOU Yi1, LI Meng1, ZHAO Zhongqiu2, LI Guogang2, FENG Yi2, MENG Xuehao1 Ocean Engineering Equipment and Technology    2025, 12 (2): 173-178.   DOI: 10.12087/oeet.2095-7297.2025.02.36 Abstract （195）      PDF（pc） （7649KB）（124）       Knowledge map    Save The ambitious level of greenhouse gas emissions reduction in international shipping has been further enhanced by the MEPC 80 meeting， and the accounting requirements for greenhouse gas emissions based on the full life cycle of ship fuels have changed the “rules of the game”. All parties are actively promoting the process of shipping emissions reduction. There are differences in the development foundation and characteristics of the fleet， which leads to differences in the choice of emission reduction paths among different fleets. Taking a certain shipping company's ocean going fleet as the research object， a carbon reduction analysis model was established to analyze the conventional petrochemical fuel path， methanol fuel path， and ammonia/hydrogen fuel path. The carbon reduction emissions and carbon reduction costs of each path were explored， and short-term and long-term carbon reduction routes applicable to domestic fleets were proposed. Related Articles | Metrics | Comments（0）

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Practical Research on Improving Safety Production Management of Unattended Offshore Platforms YU Qingyuan, QIU Shuang, ZHAO Wei, CAO Zhixing Ocean Engineering Equipment and Technology    2025, 12 (2): 8-11.   DOI: 10.12087/oeet.2095-7297.2025.02.02 Abstract （188）      PDF（pc） （1787KB）（124）       Knowledge map    Save Unattended offshore oil platforms play an important role in the exploration and development of offshore oil and gas. They are widely distributed in various oil and gas fields. With the continuous deepening of oil field development， the safety production management difficulties of unattended platforms in the production process have gradually become prominent， bringing huge challenges to the safety production work of oil fields. The safety production management of the unattended platforms are systematically expounded from the aspects of hazard management， facility safety management， unattended platform access management， and operation management. Through the implementation of various measures， the safety production level of unattended platforms can be greatly improved， thereby providing guarantees for stable production in oil fields. Related Articles | Metrics | Comments（0）

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South China Sea Beibu Gulf Offshore Oil Field Mobile Offshore Production Unit Feasibility Study LIU Tao Ocean Engineering Equipment and Technology    2025, 12 (2): 127-131.   DOI: 10.12087/oeet.2095-7297.2025.02.27 Abstract （224）      PDF（pc） （1147KB）（123）       Knowledge map    Save For the economical development of the marginal offshore oilfields, which are characterized by low-grade oil reserves and a shorter production period but nearby to existing production facility， this article will introduce the mobile offshore production unit for the purpose of implementing the economic development, while also providing guidance for the development of similar oil fields. Related Articles | Metrics | Comments（0）

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The Application of the Magnetizing Inrush Current Suppressor on the Nanhai Fenjin FPSO HU Meng1, LIANG Zhenyuan2, XU Zhisheng3, CAO Yingju3 Ocean Engineering Equipment and Technology    2025, 12 (2): 48-51.   DOI: 10.12087/oeet.2095-7297.2025.02.11 Abstract （281）      PDF（pc） （1947KB）（123）       Knowledge map    Save With the official commissioning of the Nanhai Fenjin FPSO， the stable operation of the power system has become increasingly crucial. As a special transient phenomenon during the no-load closing of transformers or the restoration after faults， the magnetizing inrush current may lead to a series of adverse consequences such as equipment damage， incorrect operation of devices， and power system failures， which have added numerous risks to the stable operation of the Nanhai Fenjin FPSO's power system. Based on the power system of the Nanhai Fenjin FPSO as the background， this paper conducts an in-depth analysis of the causes and hazards of the magnetizing inrush current， and focuses on discussing the application of the magnetizing inrush current suppressor in the Nanhai Fenjin FPSO， including its working principle， selection considerations， installation， debugging， and actual effect evaluation， aiming to provide useful references and examples for similar projects. Related Articles | Metrics | Comments（0）

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The Idea and Scheme of Process System Transformation of FPSO under Typhoon Mode SHAN Tao1, ZHANG Zhenxiang2, GONG Yulin2, XU Yejun2 Ocean Engineering Equipment and Technology    2025, 12 (2): 111-116.   DOI: 10.12087/oeet.2095-7297.2025.02.24 Abstract （211）      PDF（pc） （2276KB）（122）       Knowledge map    Save The offshore oil and gas fields in the South China Sea have long been plagued by typhoons. The remote control of typhoon mode in oilfield can reduce the influence of typhoon on offshore oilfield production. The idea and scheme of process system transformation of floating production storage offloading under typhoon mode are described， which has some reference for other offshore oil field process system transformation of typhoon remote control mode. Related Articles | Metrics | Comments（0）

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Brief Analysis of Boarding Scheme for Export Subsea Pipeline of Mobile Wellhead Platform ZHANG Fanghai Ocean Engineering Equipment and Technology    2025, 12 (2): 92-95.   DOI: 10.12087/oeet.2095-7297.2025.02.20 Abstract （223）      PDF（pc） （1312KB）（121）       Knowledge map    Save The mobile wellhead platform has the characteristics of being movable and reusable， and it is mainly used for the development of marginal oilfields. The platform is supported by four pile legs. Due to the lack of a supporting structure for the subsea pipelines and cables， it is impossible to board the platform with the jacket as the supporting structure like in a jacket platform.The advantages and disadvantages of three types of boarding methods relying on the wellhead riser， the liftable pipe rack， and the pile legs are analyzed. Boarding relying on the pile legs has advantages such as being liftable， reusable， having little impact on the platform's performance， and having a simple system. However， it is necessary to address the impact of the boarding riser passing through the platform's enclosure area on the structure and the occurrence of vortex-induced vibration phenomena. Analyzing and researching the vortex-induced vibration of the boarding riser provides a theoretical basis for the vibration control of the riser. Related Articles | Metrics | Comments（0）

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Application and Maintenance of Automatic Control System in Petrochemical Industry ZHANG Yu Ocean Engineering Equipment and Technology    2025, 12 (2): 88-91.   DOI: 10.12087/oeet.2095-7297.2025.02.19 Abstract （195）      PDF（pc） （2791KB）（120）       Knowledge map    Save The efficient application of automation control technology in the petrochemical industry plays a positive role in improving production efficiency and safety assurance.Based on this， we analyze it from the perspective of application and maintenance of automation control systems， enhancing the integration of petrochemical instrumentation and automation control technology， improving the level of informatization and the stability of system operation， has profound significance for improving the effectiveness of petrochemical instrumentation automation control. By focusing on the deep application of automation control technology and system maintenance strategies， the level of automation control and operational stability of offshore platforms are improved. Related Articles | Metrics | Comments（0）

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Maintenance Practice of Electric Heaters on a Certain Offshore Oil Production Platform ZHANG Dong, YU Chenglong Ocean Engineering Equipment and Technology    2025, 12 (2): 132-135.   DOI: 10.12087/oeet.2095-7297.2025.02.28 Abstract （208）      PDF（pc） （1419KB）（120）       Knowledge map    Save The well flow extracted from a certain offshore oil production platform has high temperature， high salinity， and contains impurities such as hydrogen sulfide and sand. In order to meet the export temperature requirements， an electric heater is used for direct heating. During the operation of the equipment， faults such as low insulation of the heater， high temperature protection shutdown during system startup， and reduced heat exchange efficiency occur， which affect the normal production of the oilfield. Through material selection and manufacturing process review during equipment manufacturing， equipment disassembly， and laboratory analysis and testing of scale on heating tube surfaces， the direct and indirect causes of the malfunction are analyzed， and effective measures are provided to avoid low insulation of the heater， high temperature protection and shutdown during system startup， etc.， in order to provide reference and guidance for the operation and maintenance of electric heaters on other platforms. Related Articles | Metrics | Comments（0）

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Weight Analysis of Comprehensive Evaluation Index of FPSO Oil， Gas and Water Separation System Based on Analytic Hierarchy Method YU Chao, TONG Yingli, LIU Hao, CHEN Changqin, SUN Haifang, SONG Kunming Ocean Engineering Equipment and Technology    2025, 12 (2): 144-151.   DOI: 10.12087/oeet.2095-7297.2025.02.31 Abstract （274）      PDF（pc） （1008KB）（120）       Knowledge map    Save In order to better analyze floating production storage offloading （FPSO） faults and construct an FPSO fault evaluation system， this paper uses analytic hierarchy to conduct fault attribution research on FPSO. The three elements of three-phase separator， electrodehydrator and sea pipe of FPSO oil， gas and water separation system were selected as the research objects， and the structural model of hierarchical analysis was established by processing and analyzing the causes of system failures. The hierarchy is used to judge the failure factor indicators， and the weight value of each failure factor indicator is calculated to analyze the cause of the failure. The results show that the weight of electrodehydrator faults is large and the degree of influence is also large， and the weight values of each index level can be well compared through hierarchical analysis to judge the degree of influence in each level. Related Articles | Metrics | Comments（0）

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A Dynamic Simulation Method for FPSO Electric Dehydrator TONG Yingli1, CHEN Changqin1, SUN Haifang1, LIU Donghui1, LIU Xuesong1, LI Huizhan2 Ocean Engineering Equipment and Technology    2025, 12 (2): 26-30.   DOI: 10.12087/oeet.2095-7297.2025.02.06 Abstract （225）      PDF（pc） （1444KB）（120）       Knowledge map    Save According to the demand for a newly built floating production storage offloading (FPSO) oil treatment process unit in the South China Sea， applying dynamic simulation technology to establish dynamic model of electric dehydrator equipment， realizing the reproduction of the working conditions of the electric dehydrator. Compared with the simulation results and equipment design parameters of commercial simulation software HYSYS， the accuracy of dynamic simulation calculation results is verified， which provides a calculation basis for technicians to improve production operation parameters and verify the feasibility of the scheme. Related Articles | Metrics | Comments（0）

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Analysis and Treatment of Oil Emulsification Fault in Low Pressure Compressor HU Zhongliang, ZHAO Wei, QIU Shuang, XIAO Weiwei, WANG Jibin Ocean Engineering Equipment and Technology    2025, 12 (2): 12-16.   DOI: 10.12087/oeet.2095-7297.2025.02.03 Abstract （230）      PDF（pc） （1302KB）（119）       Knowledge map    Save Low pressure gas compressor is a key equipment for low-pressure gas recovery. With the increase of processing gas volume， severe emulsification of compressor lubricating oil occurs， which affects the stable operation of the equipment. Combined the current low-pressure gas processing parameters and equipment structure of the processing platform to analyze in depth the causes of lubricating oil emulsification in low-pressure gas compressors. Through on-site sampling and data integration，it was found that the reason for oil emulsification is the high water content in the low-pressure gas during the process. Based on this， further research was conducted on the factors causing high water content in the low-pressure gas. By taking measures such as reducing the amount of low-pressure gas recovery， increasing the processing temperature， adding defoamer， and lowering the liquid level of the scrubbing tank，the emulsification of lubricating oil was effectively reduced. The next maintenance plan was proposed， providing reference for the maintenance;of lubricating oil emulsification faults in offshore low-pressure compressors. Related Articles | Metrics | Comments（0）

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Analysis of the Reasons for the Deterioration of MDEA Solution Affecting the Operation of the Device and Rectification Measures HUANG Qihai Ocean Engineering Equipment and Technology    2025, 12 (2): 35-39.   DOI: 10.12087/oeet.2095-7297.2025.02.08 Abstract （177）      PDF（pc） （946KB）（118）       Knowledge map    Save The natural gas treatment plant of missan oilfield used the alcohol amine absorption method for desulfurization. In 2023， the natural gas desulfurization unit was blocked， resulting in shutdown. Through the analysis and troubleshooting of the reasons for the blockage of the rich liquid filter， it is determined that the deterioration of MDEA solution causes the blockage of the rich liquid filter， and the reasons for the deterioration of MDEA solution are analyzed. The solutions of filter element replacement and new low-pressure sweet gas pipeline were studied， and the problem of MDEA solution deterioration was successfully solved. After rectification， the iron ion concentration of MDEA solution was normal， the production of the whole unit was stable， the index of exported natural gas was qualified， and the crude oil production of the oilfield was restored to the production before shutdown， so as to ensure the stable production of the oilfield. It can provide reference for similar faults of desulfurization system in natural gas treatment plant. Related Articles | Metrics | Comments（0）