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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 （722）      PDF（pc） （3209KB）（303）       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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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 （717）   HTML （2）    PDF（pc） （2536KB）（645）       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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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 （612）      PDF（pc） （3556KB）（242）       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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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 （582）   HTML （0）    PDF（pc） （4332KB）（241）       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）

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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 （562）      PDF（pc） （3894KB）（244）       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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Small Underwater Target Recognition Based on YOLOv3 YUAN Li-hao, ZAN Ying-fei, ZHONG Sheng-hua, ZHU Hai-tao Ocean Engineering Equipment and Technology

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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.   Abstract （495）   HTML （350）    PDF（pc） （6463KB）（491）       Knowledge map    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. Table and Figures | Reference | Related Articles | Metrics | Comments（0）

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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 Abstract （481）      PDF（pc） （4385KB）（59）       Knowledge map    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. Reference | Related Articles | Metrics | Comments（0）

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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 Abstract （469）      PDF（pc） （1150KB）（90）       Knowledge map    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. Reference | Related Articles | Metrics | Comments（0）

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Subsea Pipeline Appendage Finite Element Analysis and Comparison of Different Checking Criteria Jie ZHANG, Guo-min SUW, Hong-qi MA, Guo-yang LAN Ocean Engineering Equipment and Technology    2015, 2 (2): 93-98.   Abstract （468）   HTML （0）    PDF（pc） （2594KB）（316）       Knowledge map    Save Subsea pipeline system consists of pipelines, risers, spools and appendages. For pipelines and risers, special softwares is used for analysis and design; for the appendages, common finite element analysis (FEA) software is used. We use the ANSYS software to do the analysis for appendages. Considering the real load of the appendages, FEA model is built, and the stress distribution is obtained. According to DNV-OS-F101 code and ASME Ⅷ Div2 code, stress checking is carried out to estimate if the appendages can meet the requirements and ensure the safe operation. Besides, the comparison between the two checking criteria can provide a reference for future projects. Table and Figures | Reference | Related Articles | Metrics | Comments（0）

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Research on Polymer Flooding Equipment Arrangement of SZ 36-1 Oilfield Zhi-sheng DU, Jin-jin XU, Chao MA, Fa ZHANG Ocean Engineering Equipment and Technology    2015, 2 (3): 163-167.   Abstract （455）   HTML （5）    PDF（pc） （2235KB）（316）       Knowledge map    Save Polymer flooding has been applied to offshore platform for more than 10 years. Polymer flooding technology has been very mature by now. However, there are still some problems in polymer flooding equipment planning and compatibility for production equipment etc. According to the development of SZ 36-1 Oilfield polymer flooding project, we propose different equipment arrangement plans for varied scales of polymer flooding, including the schemes for increasing the deck area, and put forward the optimization directions of polymer flooding equipment arrangement. Table and Figures | Reference | Related Articles | Metrics | Comments（0）

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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 Abstract （455）      PDF（pc） （2606KB）（69）       Knowledge map    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. Reference | Related Articles | Metrics | Comments（0）

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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.   Abstract （440）      PDF（pc） （2937KB）（124）       Knowledge map    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. Related Articles | Metrics | Comments（0）

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Calculation of Horizontal Wave Impact Loads and Its Application to Local Structure Design of Column Stabilized Units WU Xin-yi, CUI Jin, NIE Yan, HUO Fa-li, WANG Ning Ocean Engineering Equipment and Technology    2018, 5 (4): 259-265.   DOI: 10.12087/oeet.2095-7297.2018.04.07 Abstract （429）      PDF（pc） （9032KB）（70）       Knowledge map    Save When the air gap of the column stabilized units turns out to be negative, the evaluation for the consequences of the negative air gap is needed, which includes the calculation of horizontal wave impact loads. According to the method of engineering design and the related international codes, a practical method is proposed for the engineering design of the column stabilized units. As a demonstration, the forward bulkhead of a certain column stabilized unit is analyzed. The wave impact loads on the local structure is calculated and the transient simulation is performed by means of the finite element method (FEM). Finally, the strain and deformation in the forward bulkhead under the horizontal wave impact loads are obtained. The results show that the effect of horizontal wave impact loads on the vertical surface of deck box cannot be ignored. Thus, once the air gap of the column stabilized units is negative, the horizontal wave impact loads on the vertical surface of deck box must be fully considered. The local structure should be reinforced and re-analyzed based on the simulation results until the design meets the rules and standards. Reference | Related Articles | Metrics | Comments（0）

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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 Abstract （429）      PDF（pc） （5179KB）（226）       Knowledge map    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. Related Articles | Metrics | Comments（0）

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Suppression Methods of Transformer Inrush Current in Offshore Platform ZHANG Xiao-yu Ocean Engineering Equipment and Technology    2018, 5 (3): 214-217.   DOI: 10.12087/oeet.2095-7297.2018.03.12 Abstract （428）      PDF（pc） （980KB）（63）       Knowledge map    Save Transformer no-load closing may cause large inrush current. This large current may cause the fail of transformer closing and the malfunction of generator vacuum circuit breaker (VCB). In order to improve the success rate of transformer closing, and thus to ensure the safe operation of offshore platform, it is essential to suppress inrush current. The cause of inrush current is introduced, and three common suppression methods including phase control, soft start and pre-magnetizing technology are described. The advantages and disadvantages of these methods, as well as their applications in offshore platforms, are compared briefly. Reference | Related Articles | Metrics | Comments（0）

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Failure Analysis and Maintenance of Flameproof Surface Shafts for Medium-Sized High-Voltage Flameproof Motor SUN Jun, LIU Lei, LIU Xin-wei, JIA Dong-hui, HUANG Lei Ocean Engineering Equipment and Technology    2018, 5 (3): 218-222.   DOI: 10.12087/oeet.2095-7297.2018.03.13 Abstract （428）      PDF（pc） （2321KB）（50）       Knowledge map    Save Flameproof three-phase asynchronous motor is widely used in dangerous areas of offshore platforms. For this kind of motor, failure mostly occurs in bearings or bearing shells. On an offshore platform in Bohai, a medium-sized high-voltage flameproof motor was shut down normally and then restarted. In the restart process, the motor vibrated, showing a suddenly increasing current and abnormal noise. Inspection showed that there was no problem in the motor bearing, so plane shaft failure was considered. The reasons for the failure of the flameproof surface and shaft of the bearing chamber of the medium-sized high-pressure flameproof motor are analyzed, and the method of repairing the damaged motor's flameproof surface and rotor shaft is described. Reference | Related Articles | Metrics | Comments（0）

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Design Research of Subsea Hose with Chinese Lantern Configuration Used in CALM System YANG Wei, ZHANG Yong-hui, SUN Guo-min Ocean Engineering Equipment and Technology    2018, 5 (3): 165-173.   DOI: 10.12087/oeet.2095-7297.2018.03.04 Abstract （419）      PDF（pc） （2292KB）（84）       Knowledge map    Save Subsea hose is an important part of catenary anchor leg mooring (CALM) system. The technical requirements, design conditions and analysis methods of subsea hose with Chinese lantern configuration in the CALM system are introduced. It is confirmed that the key of subsea hose design is the reasonable determination of hose section, float arrangement and buoy offset. In addition， the dynamic response of the subsea hose and the fatigue of key parts are analyzed with an example, which provides a reference for practical engineering design. Reference | Related Articles | Metrics | Comments（0）

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Trends of Pipeline Free Spanning Evaluation and Their Applications in In-Service Evaluation XIA Qiu-ling, FENG Xian-hong Ocean Engineering Equipment and Technology    2018, 5 (3): 154-159.   DOI: 10.12087/oeet.2095-7297.2018.03.02 Abstract （418）      PDF（pc） （946KB）（84）       Knowledge map    Save The development trends of free spanning evaluation and related criteria in the pipeline industry from the 1980s are presented. An example is given to calculate the maximum allowable span length by different codes. Then, the differences in the criteria and critical cases are compared and the reasons for these differences are analyzed. Finally, based on the engineering experience and the in-service evaluation results, suggestions on the code selection for submarine pipeline design and in-service evaluation are given. Reference | Related Articles | Metrics | Comments（0）

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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.   Abstract （418）      PDF（pc） （3626KB）（167）       Knowledge map    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. Related Articles | Metrics | Comments（0）