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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
    Abstract868)      PDF(pc) (3209KB)(383)       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.
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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.  
    Abstract804)   HTML2)    PDF(pc) (2536KB)(951)       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.

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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

    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
    Abstract704)      PDF(pc) (3556KB)(277)       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.
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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
    Abstract679)      PDF(pc) (3894KB)(282)       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.
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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.  
    Abstract675)   HTML1)    PDF(pc) (4332KB)(348)       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.

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     Preliminary Study on Development and Application of FPSO
    DU Qing-gui, SHEN Xiao-chan, TAN Guo-rong, LIU Cong, FU Dong-ming
    Ocean Engineering Equipment and Technology    2017, 4 (2): 63-68.  
    Abstract606)      PDF(pc) (3341KB)(238)       Save
     Floating production storage and offloading system (FPSO) has been widely used in different oil and gas field offshore owing to its excellent economics and good adaptability. There are 13 FPSOs in service in China. In this paper, the development history and engineering application of FPSO is firstly summarized. Then the composition of FPSO with different shape is described. Furthermore, the development modes and engineering schemes frequently used are fully listed. Lastly the development trend of FPSO is analyzed. This research may provide good references for the design and application of FPSO in China.
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    Small Underwater Target Recognition Based on YOLOv3
    YUAN Li-hao, ZAN Ying-fei, ZHONG Sheng-hua, ZHU Hai-tao
    Ocean Engineering Equipment and Technology   
    Subsea Christmas Tree Tubing Hanger Installation by Simplified Landing String
    Ning ZHANG, Jia-you MAO, Jian-jun YANG
    Ocean Engineering Equipment and Technology    2015, 2 (3): 145-151.  
    Abstract569)   HTML350)    PDF(pc) (6463KB)(566)       Save

    The simplified landing string is introduced to Liuhua 4-1 Field for the installation of subsea Christmas tree (XT) tubing hanger, considering the low pressure in reservoir and absence of shallow gas. After demonstrating the feasibility of the simplified landing string system, the main equipment of this system is introduced, including the simplified landing string, umbilical system, tubing hanger running tool and tubing hanger. Then the control factors and restriction conditions are represented, followed by the detailed description of installation steps. Finally, a comparison is made between the application of conventional landing string and simplified landing string. The results can offer a reference for the exploitation of marginal subsea fields.

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     Usage of Polyester Rope in Deepwater Mooring System
    FENG Li-mei
    Ocean Engineering Equipment and Technology    2016, 3 (5): 315-319.  
    Abstract564)      PDF(pc) (2937KB)(164)       Save
     Polyester rope has been put into usage as part of mooring lines for two decades around the world. As the offshore oil and gas development in the South China Sea goes deeper and deeper, polyester rope will be widely used sooner or later. The history, composition, production process of polyester rope, as well as characteristics and specific requirements during engineering, installation and maintenance of polyester rope are described. The differences between polyester rope and wire rope mooring system design are also listed. The re-tension issues during maintenance should be discussed further if the polyester rope is planned to be used in the South China Sea. This work can provide some guidance for the usage of polyester rope in the South China Sea.
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    Installation Analysis of S-Lay Pipeline End Termination
    XING Guang-kuo, WANG Chang-tao, WANG Feng-yun, ZHANG Mei-rong, ZHANG Peng-fei
    Ocean Engineering Equipment and Technology    2018, 5 (2): 129-132.   DOI: 10.12087/oeet.2095-7297.2018.02.10
    Abstract559)      PDF(pc) (5179KB)(246)       Save
    The pipeline end termination (PLET) laid by S-lay will bear tensile stress from the pipeline and bending stress caused by bending deformation, when it gets through the stinger. Using the finite element analysis software ANSYS, we establish the finite element model of PLET passing through the stinger and carry out calculations and analyses for different positions of the stinger. It is found that the maximum strain appears near the location of the connection between PLET and pipeline. This will provide basis for the capability analysis of S-lay PLET passing through the stinger.
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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
    Abstract557)      PDF(pc) (2517KB)(1005)       Save
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    Winch Design of Catenary Anchor Leg Mooring System
    TIAN Feng, DONG Xiao-man, ZHANG Jia-ping, Lyu Jin-bo, ZHOU Yan
    Ocean Engineering Equipment and Technology    2018, 5 (3): 197-201.   DOI: 10.12087/oeet.2095-7297.2018.03.09
    Abstract551)      PDF(pc) (4385KB)(75)       Save
    Key contents to be considered in the winch design of catenary anchor leg mooring (CALM) single point mooring system are introduced and concluded, including environment condition to be satisfied, selection of drive mode, steel wire rope selection, spooling gear configuration, winch installation, etc. In an actual design project, the design results meet the functional requirements and save the equipment costs. Some references are provided for the type selection design of winch in similar facilities.
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    Research on Pressure Compensator Used for Deep-Sea Hydraulic System
    HU Hao-long, LONG Lei, SHEN Xue, ZHANG Wan-liang
    Ocean Engineering Equipment and Technology   
    Research on Power System for Large Capacity Electrically Driven Compressors on Offshore Platform
    LIU Guo-feng, WAN Guang-fen, GAO Xuan
    Ocean Engineering Equipment and Technology    2018, 5 (1): 58-62.   DOI: 10.12087/oeet.2095-7297.2018.01.12
    Abstract546)      PDF(pc) (2606KB)(90)       Save
    The application of large capacity electrically driven compressor will cause significant changes in the power system of offshore platform. Based on a specific offshore project, we introduce the overall electrical system plan for the platform with electrically driven compressors, and point out the key technical problems that should be focused on to optimize the power system. In particular, simulation calculations are required to ensure the stability of power system. Results from the study will have some guidance and reference for similar projects in the future.
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    Research on Assembly Process of Reciprocating Natural Gas Compressor
    FANG Chun-wei, GAO Zhi-lin, WANG Yang-jian, LIU Jia, ZHOU Huan-yu, ZHANG Chen-xi
    Ocean Engineering Equipment and Technology    DOI: 10.12087/oeet.2095-7297.2018.05.04
    SCR Strength Study for the Application of SCR to Semi-Submersible Platform in the South China Sea
    ZHANG Xue-hui, XU Ai-jin, CHENG Yong-ming, ZHANG Wei, WEN Yan
    Ocean Engineering Equipment and Technology    2018, 5 (4): 266-273.   DOI: 10.12087/oeet.2095-7297.2018.04.08
    Abstract545)      PDF(pc) (4808KB)(309)       Save
    Semi-submersible platform is a new type of deepwater floating platform, which can be used for oil and gas exploration, development and production in the South China Sea. Steel catenary risers (SCRs) are widely used in deepwater applications due to the relatively simple structure, economy and reliability. The strength of SCR is usually influenced by environmental load and platform movement. Whether the strength meets the requirements is related to the production safety of the platform, so the study of riser strength is crucial. We mainly introduce the layout and configuration of riser, as well as the design method and key technologies of riser, and study SCR strength for the application of SCR to semisubmersible platform in the South China Sea. The strength analysis results of 18-inch riser are given as an example, which provides a good reference for the engineering design of riser.
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    Strength Assessment on Corroded Subsea Pipeline Based on the Code of DNV-RP-F101
    WANG Meng, ZHAO Dong-yan
    Ocean Engineering Equipment and Technology    2017, 4 (5): 276-280.  
    Abstract543)      PDF(pc) (3626KB)(230)       Save
    The failure of submarine pipelines due to corrosion defects has an increasing tendency in recent years. In order to assess the failure risk when corrosion occurs, we present a review of the strength assessment procedure of DNV-RP-F101. The parameters which will impact on burst pressure are studied. And the relation between DNV-RP-F101 and DNV-OS-F101 is discussed. Based on the calculation results, the following conclusion can be made. Among the key parameters, the inspection accuracy has the greatest influence on the strength assessment results. When certain condition is satisfied, the ratio of yield to tensile is negligible.
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    Fatigue Analysis of Truss Tubular Joints of a New-Type Production and Storage SPAR
    MA Wang-kou, LIU Jun
    Ocean Engineering Equipment and Technology    2018, 5 (4): 252-258.   DOI: 10.12087/oeet.2095-7297.2018.04.06
    Abstract538)      PDF(pc) (1150KB)(114)       Save
    Spectral fatigue analysis method for truss tubular joints is studied and used to analyze the truss tubular joints of a new-type production and storage SPAR based on the sea condition of South China Sea. The results show that the fatigue strength of truss tubular joints of the new-type SPAR satisfies design requirement, and the fatigue strength of columns is worse than that of braces. Contributions to fatigue damage by axial force,in-plane bending moment and out-of-plane bending moment of braces are analyzed individually as well. The results show that the fatigue damage at diagonal braces is mainly caused by axial force of braces,the fatigue damage at horizontal braces is mainly caused by in-plane bending moment,while out-of-plane bending moment has little effect on fatigue damage at all braces.
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    VIV Fatigue Damage Analysis for Tendons of Tension Leg Platform under In-Place Condition
    LIU Yu-xi, HUANG Huai-zhou, LIU Zhao
    Ocean Engineering Equipment and Technology    2018, 5 (3): 186-190.   DOI: 10.12087/oeet.2095-7297.2018.03.07
    Abstract538)      PDF(pc) (4658KB)(108)       Save
    The vortex-induced vibration (VIV) caused by current directly affects the fatigue of tendon of tension leg platform (TLP). Proper VIV fatigue analysis is very important for tendon fatigue life prediction. Firstly, the mathematical model for tendon VIV and stress-life (S-N) curve method are studied. Secondly, for tendons under TLP in-place condition, the procedure of VIV fatigue analysis using Flexcom and SHEAR7 is presented. Finally, detailed VIV fatigue analysis is performed for a specified TLP.
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