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    Global Structural Strength Analysis Methodology of a Typical TLP
    Yang LI, Zhong-min SHI, Bin XIE, Wen-hui XIE
    Ocean Engineering Equipment and Technology    2014, 1 (1): 3-13.  
    Abstract302)   HTML2)    PDF(pc) (3686KB)(6105)       Save

    We focus on the global structure strength analysis of a typical tension leg platform (TLP). The objective of the TLP global structural analysis is to check the hull global structural integrity under design environmental conditions. Firstly, a global finite element model of the entire TLP is established, the hull structure is modeled in detail, whilst the deck structure is represented through a simplified deck beam model. A hydrodynamic analysis for operation and extreme conditions is conducted to get the design wave parameters for critical wave loads. After that, wave loads are mapped to the global structure finite element model, and the tendons are modeled as spring element which represents 6 degrees of freedom and rotations. Finally, the maximum stress and its distribution trends, together with the control elements, are obtained by finite element analysis according to critical wave heading, wave periods, wave heights and wave positions. Results and the TLP analysis method proposed can be used as reference for strength analysis of other offshore platforms.

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    A Brief Summary of Key Points for The Installation of Offshore Wind Turbine Monopile Foundation
    FAN Changhui
    Ocean Engineering Equipment and Technology    2023, 10 (2): 1-7.  
    Abstract208)      PDF(pc) (6154KB)(768)       Save
    The installation of offshore wind turbine monopile foundation requires a variety of ship machinery and lifting equipment, etc. If the suitabe selection of those above matters could make the completion of the construction objectives be achieved. In order to select suitable ship machinery lifting equipment, using project as example the compare between domestic and foreign monopile installation, the selection consideration of the main floating crane ship and the drivability of the hydraulic hammer are specifically analyzed through the verification analysis of the monopile stabilizing platform and the description of other additional installation points, which shows that the main considerations for the selection of marine machinery and lifting equipment for offshore wind turbine monopile installation in China and the verification analysis methods are useful. These can provide serve as for the selection of marine floating machine for monopile installation, for the design and verification of monopile stabilizing platform, and for the preparation of construction organization and scheme.
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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   
    Key Technologies and Breakthrough Path of Hydrogen Production by Offshore Wind Power
    GAO Chang, LI Hongtao
    Ocean Engineering Equipment and Technology    2023, 10 (2): 89-94.  
    Abstract196)      PDF(pc) (2904KB)(713)       Save

    Marine renewable energy is abundant but difficult to store. The generation of green hydrogen from offshore renewable energy can provide a new idea for the storage of green energy. This paper mainly analyzes the key technologies of hydrogen production from offshore wind power, focusing on the four aspects of offshore water electrolysis hydrogen production technology, offshore hydrogen energy storage and transportation technology, offshore hydrogen production and storage equipment design, as well as offshore hydrogen production and storage scheme. This paper compares and summarizes the key technologies of offshore wind power hydrogen production in China, and puts forward relevant countermeasures and suggestions on this basis. It provides reference for the innovative development of offshore wind power hydrogen production technology and equipment in China.

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    The Hull Structure Design and Practice of the Condensate Storage Tank of Semi-Submersible Platform
    LIU Xiaoyan, FENGJiaguo, LI Da
    Ocean Engineering Equipment and Technology    2023, 10 (2): 8-13.  
    Abstract112)      PDF(pc) (5185KB)(704)       Save
    There is little industrial experience and projects for semi-submersible platform with large volume condensate storage tanks. The hull structure design of condensate storage tanks were provided. Firstly, the column was designed with the double-wall voids (cofferdams ) around the condensate tanks and connected with flats with manholes for maintenance access. Secondly, the pressure head of condensate tank was increased by 10 m compared to the ballast tank after optimizing the reduction of 20 m. Thirdly, the bulkheads of condensate tank are non-watertight and continuous, but with the upper and lower 2 m height gaps for the flowing of condensate and gas. Fourth, the additional corrosion margin of 2 mm was added to the boundary of frequently ballast and de-ballast tanks in the nodes and columns. It is a successful practice for other similar design in the future.
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    Research on Key Technologies of Dynamic Analysis and Numerical Simulation for the Floating Offshore Wind Turbine
    QU Xiaoqi, LI Hongtao, TANG Guangyin, DU Haiyue, YANG Linlin
    Ocean Engineering Equipment and Technology    2023, 10 (2): 72-78.  
    Abstract124)      PDF(pc) (8230KB)(677)       Save

    With the development of floating offshore wind turbine technology, engineering projects of large scale floating offshore wind turbine has begun to emerge. Because manufacturers keep the parameters of wind turbine confidential, there are many challenges in numerical simulation analysis of floating offshore wind turbines in practical engineering projects. In this paper, the key technologies on numerical simulation of floating wind turbine in the practical engineering project was studied. Through the equivalent thrust model, a numerical model of real floating wind turbine was established and the dynamics responses under a typical load case was analyzed. Based on the research results of this study, the difficulties in establishing the numerical model of floating wind turbine in practical engineering projects can be well solved. This is of great significance to promote the technical development and accelerate the commercialization of China's floating wind turbine industry.

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    Study on Interface Principal for Topside of General FPSO
    LIU Yanming, HU Rong, GUO Guosheng, YE Yongkun, WU Zhikun
    Ocean Engineering Equipment and Technology    2023, 10 (2): 37-42.  
    Abstract77)      PDF(pc) (5538KB)(668)       Save
    Firstly, the purpose of study on interface principle for topside of FPSO is introduced; Secondly, the typical main process scheme, general arrangement, structure scheme are illustrated; Thirdly, the interface between FPSO topside and Hull/Subsea are analyzed and demonstrated, including the interface about process, general area, structure, EIT. Finally, it is prospected how to proceed the interface principal study in the future.
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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.  
    Abstract729)   HTML2)    PDF(pc) (2536KB)(668)       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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    Overview of Subsea Well Intervention Technology and Equipment Development
    WANG Di, HUANG Congcong, CHANG Shuangli
    Ocean Engineering Equipment and Technology    2023, 10 (2): 126-130.  
    Abstract108)      PDF(pc) (2963KB)(616)       Save

    As the continuous expansion of the resources development of offshore oil and gas, more subsea well will be used at domestic offshore oil and gas fields, yet there is still no supporting technology and equipment for subsea well intervention in China. This paper compare the technology of well intervention and workover, introduce two kinds of light well intervention systems, compare their advantages and disadvantages, and then analyze the development and operation of subsea well intervention systems in the world. The development gap and countermeasures of related technologies in China will be summarized, at the end. 

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    Taut Mooring System Design and Analysis of Octagon FDPSO
    Qiang SUN, Qing-hui DONG, Gui-sheng PENG, Tian TIAN, Bin XIE, Shi-sheng WANG, Xi-chong YU, Jing-rui ZHAO
    Ocean Engineering Equipment and Technology    2015, 2 (3): 175-183.  
    Abstract329)   HTML5)    PDF(pc) (2706KB)(591)       Save

    The existing mooring systems are compared and analyzed with the consideration of vessel shape, environmental condition and design cases. Average-distributed taut mooring system is finally selected for the octagon floating drilling, production, storage and off loading system (FDPSO) in the South China Sea. According to the requirements of station keeping and line forces, an averaged-distributed taut mooring system is designed based on the environmental condition at the depth of 2 000 m in the South China Sea. Compared with the traditional catenary mooring system designed for the same FDPSO, the averaged-distributed taut mooring system reduces the mooring system self-weight and the mooring radius on seabed. In addition, the offset of FDPSO with one mooring line damaged can be efficiently managed under 100-year environmental condition. The proposed mooring system can meet the requirements of octagon FDPSO. Furthermore, the research results will offer references for the mooring design of similar floating structures.

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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.  
    Abstract505)   HTML350)    PDF(pc) (6463KB)(503)       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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    Design and Analysis of the Pressure Test Facilities of Subsea Wellhead and Supporting Tools
    GENG Yanan, WANG Mingchun, SUN Chong, ZHANG Huizeng, ZHAO Weiqing, ZHAO Suwen, LIJian, HU Xiaoyu
    Ocean Engineering Equipment and Technology    2023, 10 (2): 14-21.  
    Abstract79)      PDF(pc) (5040KB)(502)       Save
    Subsea wellheads subjected to complex internal pressure and external loads is the key equipment for deepwater oil and gas development. Currently, stability of subsea wellhead and corresponding supporting tools are mainly assessed by theoretical analysis and numerical simulation. Due to lack of pressure test tools, the actual structure responses of subsea wellhead and corresponding supporting tools could not be reflected. In this work, specialized tools aiming attesting the internal pressure of subsea wellhead and corresponding supporting tools are designed with consideration of different operation conditions and loads. Additionally, for guaranteeing the security of test tools during test experiments, mechanical strength analysis is carried out by establishing related finite element model. Simulation results show that bearing capacity test could be implemented in safety using the designed test tools, and the stress are lower than the yielding strength of test tools. The research could provide technical support for the structural design and optimization analysis of the subsea wellhead test tool.
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    Overview of the Development of Expendable Conductivity Temperature and Depth
    DU Libin, CUI Yongchao, LIU Jie, ZHANG Xiaobo
    Ocean Engineering Equipment and Technology    2023, 10 (3): 33-40.  
    Abstract169)      PDF(pc) (1757KB)(463)       Save

    Expendable Conductivity Temperature and Depth (XCTD) is an advanced marine dynamic environmental element measuring instrument, which can be used on various civil and military vessels, aircraft or submarines to quickly obtain underwater environmental information data. It is a standing instrument for marine survey and an important supplement to traditional measuring instruments such as marine environmental monitoring buoy, submarine buoy and shipborne CTD because of its flexibility, economy and simplicity. At present, the Expendable Conductivity Temperature and Depth is widely used in the field of ocean profile observation because of its characteristics of simple measurement, high measurement efficiency and low hardware cost. In order to understand the development gap at home and abroad and clarify the future development direction of this field, this paper expounds the development status of the expendable marine exploration instruments at home and abroad through comparative analysis and summary starting from its classification, at the same time, compares the main gap between domestic and foreign products, and focuses on the working principle and key technology of the Submarine-launched Expendable Conductivity Temperature and Depth (SSXCTD), meanwhile, the research summarized the future research directions in this field.

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    Multiaxial Fatigue Assessment of Pile Leg Joint under Complex Stress State
    Ying-fang LIU, Hong-feng LIU, Fu-hong JIANG, Li-zhong SAN, Yan-feng WANG, Wan-xiong XU
    Ocean Engineering Equipment and Technology    2015, 2 (2): 75-79.  
    Abstract255)   HTML0)    PDF(pc) (2388KB)(462)       Save

    A new multiaxial fatigue criterion is introduced. In combination with the hot spot stress method, it is used to estimate the fatigue life of about 250 test specimens published in international open literature, through which the accuracy of the new method is verified. Finally we use the new method to do a successful fatigue life assessment of the pile leg joint. This research provides an available reference to improve the accuracy of the fatigue life prediction of pile leg joint.

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    Thermal Load Analysis on 6S50ME-B Piston Crown
    Jian TIAN
    Ocean Engineering Equipment and Technology    2015, 2 (2): 118-123.  
    Abstract205)   HTML0)    PDF(pc) (2714KB)(441)       Save

    The low speed two-stroke marine diesel engine is developing continuously towards long stroke, high pressure, high automation, high intelligence, low consumption and low emission. MAN Company designs new ME-B type diesel engine to meet these requirements. Piston crown are one of the most important components of the engine and thermal load analysis is always the focus of research. ME-B piston crown is modified significantly in structure and dimension compared with old design. Finite element analysis is carried out for piston crown of the latest 6S50ME-B diesel engine by using ANSYS software. The three-dimensional model of piston crown is established and the temperature field is obtained. Using the temperature field as the boundary conditions, the thermal stress field and the weak point on the piston crown are found, which may offer theoretical support for further optimization.

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    Global Response Analysis for the Deep-Sea Umbilical
    Xi-qia CHEN, Lei-jian SONG, Xia-ying DU, Jun WAN, Shi-xiao FU
    Ocean Engineering Equipment and Technology    2015, 2 (2): 111-117.  
    Abstract285)   HTML1)    PDF(pc) (3900KB)(432)       Save

    We present the global analysis for the deep-sea umbilical. The design and analysis of the umbilical has become the research focus in the offshore engineering field. Global response analysis is the key issue in the research of umbilical. We present the theoretical models of the free hanging catenary shape and the lazy-wave shape at first. Based on the theoretical models, the umbilical models of the free hanging catenary shape and lazy-wave shape are then developed in OrcaFlex. The distribution characteristics of effective tension and bending curvature are calculated and compared. The results show that the shape of the lazy-wave is more complex than that of the free hanging catenary. However, the lazy-wave shape can reduce the effective tension at the top hanging points and dynamic response at the touchdown point, which makes it more applicable in the deep sea. Meanwhile, the sensitivity analysis of the generalized configuration parameters, including the length of the buoyancy catenary, the buoyancy factor and the starting location of the buoyancy catenary, is performed and the effect of the configuration parameters on the static characteristics of the umbilical is studied. The research results may provide a reference for the configuration design of the deep-sea umbilical.

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    Current Status and Characteristics of Semi-Submersible Crane and Pipe-Laying Vessel
    CHEN Rong-qi, PENG Xiao-jia
    Ocean Engineering Equipment and Technology    2017, 4 (6): 317-321.  
    Abstract362)      PDF(pc) (2811KB)(420)       Save
    Semi-submersible crane vessel (SSCV) is a kind of column stabilized unit which consists of deck box, column and pontoons. The main functions of this kind of vessel are heavy lifting and J-lay pipe-laying. SSCV's seakeeping performance and weather windows are much better than normal vessel type. There is a lot of equipment on the vessel with a big power request, with the total power normally beyond 60 MW, and 4 even 6 engine rooms and more than 8 thrusters are needed. Due to the high cost and the technical difficulty, SSCVs in the world are very few, and the core technology has been monopolized by several foreign companies. In order to continuously improve the capacity of China's deepwater marine equipment and break the monopoly of foreign companies, COOEC is conducting the early research of SSCV. To provide reference for further research of domestic technicians, we summarize the current status of SSCV in the world, and introduce the main characteristics of this vessel.
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    Design and Application of SDH Fiber Optic Network for Offshore Oil and Gas Field
    Jin-hong XIE, Xiao-peng LI, Jian-mei GAO
    Ocean Engineering Equipment and Technology    2015, 2 (3): 209-214.  
    Abstract199)   HTML4)    PDF(pc) (1404KB)(416)       Save

    As the growing needs of data transmission rate and reliability in oil field production, synchronous digital hierarchy (SDH) fiber optic network is applied to offshore oil fields. We introduce such a new fiber optic network technology from two aspects, i.e., network structure and self-healing ring network, and frame structure and transmission rate. The design method, optical fiber design and design of optical terminal equipment are analyzed using the CFD11 project as an example. Through the successful application in the project, we draw a conclusion that the SDH technology is completely applicable to offshore oil and gas fields.

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    Study on the Pilot Plant’s Capacity of Floating Liquefied Natural Gas Processed by Propane Pre-Cooling and Dual-Nitrogen-Expansion Sub-Cooling
    Miao-er LIU, En-dao LI, Quan-sen YIN, Xiao-liang TAI
    Ocean Engineering Equipment and Technology    2015, 2 (3): 152-156.  
    Abstract285)   HTML8)    PDF(pc) (915KB)(410)       Save

    Based on the propane pre-cooling and dual-nitrogen-expansion sub-cooling (C3-DN2) process used for floating liquefied natural gas production, storage and offloading unit (LNG-FPSO), a pilot unit will be built to test the rationality of process configuration and key control modes, and to study the operability and flexibility of its application in offshore cases. In order to define the capacity, the pilot unit should keep the consistency of process configurations and key control modes, and the similarity of moving and flow regime with LNG-FPSO. The factors affecting the capacity of the pilot unit are further investigated, and the results show that the type of key equipment to keep the consistency of key control mode greatly impacts the capacity, and the other factors have less influence. Among the main devices, the refrigerant compressor should be considered the most carefully when defining the capacity of the pilot unit, and others such as cold box, driver, turbine expander and the heat exchanger for C3 are less important. Therefore, it is better to select the same type of refrigerant compressor in the pilot as that in the LNG-FPSO, and to design two plate-fin heat exchangers in parallel in the cold box.

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    CO2 Storage Scenario for Dongfang Gas Field Terminal
    Zhi-jun LI, Xi-chong YU, Yu-xing LI, Qing WANG, Bing CHENG
    Ocean Engineering Equipment and Technology    2015, 2 (2): 105-110.  
    Abstract214)   HTML0)    PDF(pc) (3704KB)(407)       Save

    The available CO2 volume in Dongfang gas reservoir is rather abundant, which brings an important problem, that is, how to bury the CO2 to realize CO2 emission reduction. According to the specific situation of Dongfang gas field terminal, four schemes to recycle CO2 are proposed, including burying on site onshore or offshore and injecting in Weizhou oil field or Bohai oil field for enhancing oil recovery (EOR). On that basis, four utilization programs, all of which include treatment, liquefaction, transportation and burying of CO2, are put forward. Finally, process calculation, apparatus selection and economic analysis are developed for every scheme. Results show that the first scheme (onshore local storage near Dongfang gas field terminal) possesses the least investment, but no profit. The fourth scheme [EOR/enhancing gas recovery (EOR/EGR) in Bohai Gulf] takes the largest investment. The investment of the second scheme (EGR in Dongfang 1-1 gas field) is less than that of the third scheme (EGR/EOR in Weizhou 12-1 platform). EGR/EOR can always get profit. The optimum scheme should be determined by economic evaluation.

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    Deluge System Optimization Design for Offshore Oil and Gas Production Facility
    Jin-hong XIE, Jin LI, Yan-hua LI, Jiao-lin ZHU
    Ocean Engineering Equipment and Technology    2015, 2 (2): 128-132.  
    Abstract226)   HTML2)    PDF(pc) (2023KB)(389)       Save

    Deluge system is an important system on offshore oil and gas production facility. The design of deluge system is related with other offshore system design such as electric system and general layout design. Nozzle type selection and deluge distribution piping routing have much more impact on the fire water system design. We put forward an optimization method from the theoretical to the actual engineering design aspects. This method can decrease the water demand as much as possible and save the engineering cost on the premise of meeting the requirements of safety and standards.

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     Study on the Strengthen Method of Stability of Long Cabin Stiffened-Cylindrical Shell
    RUAN Jun-jie, XU Wei-jun, CHEN Tian-yi
    Ocean Engineering Equipment and Technology   
    Parameter Research on the Contact Load of the Over-Bend of Flexible Pipe During Laying
    Hai-bin YE, Jian-feng YUE, Yong-biao YE, Qian-jin YUE, Jin-long CHEN
    Ocean Engineering Equipment and Technology    2015, 2 (3): 184-188.  
    Abstract223)   HTML3)    PDF(pc) (4785KB)(386)       Save

    The over-bend of the flexible pipe will be subjected to obvious contact load during horizontal laying and failure may occur because of crushing. This usually restricts the application of horizontal laying in deep water. Therefore, it is significant to accurately estimate the contact load on the over-bend of the flexible pipe during laying. We carry out theoretical research on the over-bend contact load, deduce a simplified calculation formula, and investigate the key parameters which affect the contact load in the laying cases by numerical simulation. The results can offer a specific guidance for the over-bend contact load analysis in flexible pipe laying, and provide a reference for the laying design as well.

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    Dynamic Cable Fatigue Analysis Based on Time Domain Analysis Method 
    Ocean Engineering Equipment and Technology    2022, 9 (2): 50-55.  
    Abstract211)      PDF(pc) (3713KB)(385)       Save
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    Study on Repair Methods for Deepwater Pipeline
    Chao MA, Kun SUN, Ye-zhou HUANG, Xiao-dong CHEN, Shou-yang SUN
    Ocean Engineering Equipment and Technology    2015, 2 (3): 168-174.  
    Abstract200)   HTML7)    PDF(pc) (15760KB)(382)       Save

    The special environment conditions of oil and gas fields near Liwan 3-1 are introduced with their adverse effects on pipelines, and three damage scenarios of deepwater pipeline for repairing damaged pipeline are listed. According to the damage scenarios, methods for repairing damaged pipeline in deep water are summarized with repair procedure and equipment, and those methods are compared. Finally, the application possibility of all methods for pipeline repair in deepwater field is analyzed. It is concluded that repair with bolted clamp or connector can be main repair methods for deepwater pipelines in China.

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    Application of Ship 3D-modeling based on NURBS surface

    ZHANG Dapeng, YAN Jin, ZHAO Bowen, HOU Ling, ZHU Keqiang
    Ocean Engineering Equipment and Technology    2023, 10 (3): 24-32.  
    Abstract117)      PDF(pc) (7786KB)(378)       Save

    NUBRS surface modeling technology is specially designed for the reconstruction of 3D models of complex surface objects. It can accurately and precisely express the contour and shape of the 3D model of target objects based on the form of curves and surfaces. This paper introduces Maxsurf Modeler, a 3D modeling program of hull based on NURBS surface, and gives the process of applying this program to 3D modeling of hull. At the same time, the reliability and applicability of the 3D model are verified by CFD. In the calculation of hydrostatic resistance, the maximum error under 6 working conditions is 2.29%. In seakeeping calculation, the calculation error of pitch motion is the largest, which is 19.32%. The results show that the 3D model completed by Maxsurf Modeler has certain reliability.

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    Research on Assembly Process of All Slewing Floating Crane
    Yang BAI, Zhi-lin GAO, Zheng-quan XUE
    Ocean Engineering Equipment and Technology    2015, 2 (1): 55-59.  
    Abstract235)   HTML0)    PDF(pc) (1579KB)(377)       Save

    Offshore oil development project relies on floating crane. On "HYSY201" deepwater pipe-laying crane vessel, the 4000 t all slewing floating crane is designed according to European standards. Its building and assembly are precision, difficult and complex, and the assembly quality directly affects the performance of the floating crane. The key technologies including assembly procedure, precision measurement, virtual assembly, tooling design, and lifting are introduced in detail. The general assembly process for such floating cranes are discussed.

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    Review of Single-Point Mooring System of FPSO
    Jian-hui XIE, Liao-quan YANG
    Ocean Engineering Equipment and Technology    2014, 1 (3): 189-194.  
    Abstract366)   HTML1)    PDF(pc) (3207KB)(374)       Save

    We summarize the single-point mooring systems of floating production storage and offloading system (FPSO). The review covers catenary anchor leg mooring system, single anchor leg mooring, soft yoke mooring system, external turret mooring system, and internal turret mooring system. In the end, the application prospects of FPSO for domestic deepwater oil and gas resources development are given.

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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
    Abstract382)      PDF(pc) (2517KB)(366)       Save
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    Optimization in the Control Modes for Propane Compressor in C3/MRC Liquefaction Process
    Hong-yu PAN, Shun-li LI, Yu-xing LI, Jian-lu ZHU
    Ocean Engineering Equipment and Technology    2015, 2 (3): 157-162.  
    Abstract257)   HTML11)    PDF(pc) (2376KB)(365)       Save

    The flexibility of three reflux modes including overall reflux, gradual reflux and last stage reflux for propane compressor in C3/MRC liquefaction process is simulated respectively by dynamic simulation, on which basis high pressure control and low pressure control are added, respectively. In this way, the influence on liquefaction process and the response speed of the controller by changing the settings of controller can be analyzed. It is indicated that the high pressure control of gradual reflux can meet the demand of better stability and faster response in liquefaction process.

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    Development of 20 m Seafloor Core Sampling Drill
    Bu-yan WAN, Yong-ping JIN, Xiao-jun HUANG
    Ocean Engineering Equipment and Technology    2015, 2 (1): 1-5.  
    Abstract217)   HTML0)    PDF(pc) (2436KB)(356)       Save

    Seafloor core sampling drill is necessary equipment for marine geologic and environmental investigation. A 20 m seafloor core sampling drill is chosen as the study object. Its technical features and at-sea operation are described from the aspects of supporting and leveling mechanism technology, drill string making and breaking, drill rods storage technology, telemetry/telecontrol and high-speed data communication technology, as well as escape technology.

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    Application of Subsea Structure Scouring Incipient Assessment Based on FLUENT in Indonesia Subsea Pipeline Project
    Zi-peng ZHOU, Wen-jun ZHONG, Mei-zhen ZHOU, Guo-min SUN, Le-qin WANG, Chun-hong HU
    Ocean Engineering Equipment and Technology    2015, 2 (1): 45-49.  
    Abstract307)   HTML0)    PDF(pc) (1106KB)(354)       Save

    Many subsea pipelines have been failed during their service period caused by scouring of pipeline support structure. When a submarine pipeline or submarine structure is laid on a sediment bed, and is subject to a current, the pressure difference between the upstream and the downstream of the pipeline or the structure may induce a scour underneath the pipe and submarine structure. According to this problem, the subsea pipeline support structure scouring assessment is studied to forecast the scouring occurrence. Firstly, the sediment incipient velocity is calculated based on scouring theoretical analysis, and then a two-dimensional geometry model is built in FLUENT software, and the actual seabed current velocity is obtained based on numerical simulation by FLUENT software. Through the comparison between these two velocities, the scouring occurrence could be assessed. This method is validated in Indonesia subsea pipeline project.

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    Technical Status and Developing Trend of Vertical Lay System for Flexible Pipe Laying
    CHEN Xiaodong, SUN Kun, ZHANG Xiwei, PENG Yong, YANG Sheng, LIU Wen
    Ocean Engineering Equipment and Technology    2023, 10 (2): 22-29.  
    Abstract116)      PDF(pc) (3941KB)(347)       Save
    Flexible pipes are important facility for offshore oil and gas development. Vertical laying technology is a high-speed and efficient method for flexible pipes laying operation, which has been widely used in deepwater development projects in the world. The advantages o fvertical laying in deepwater is analyzed by comparing the two typical laying methods for flexible pipes. The type and system components, structural and layout characteristics, and suppliers for designing and manufacturing vertical laying system are summarized. The future development trend and localization suggestions of vertical laying system is analyzed, which can provide a useful reference for the independent development of vertical laying system equipment in China.
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    Design of China National Scientific Seafloor Observatory Buoy Platform
    LI Qing, LU Hai, HAN Rui, WANGJianjun
    Ocean Engineering Equipment and Technology    2023, 10 (2): 119-125.  
    Abstract116)      PDF(pc) (3430KB)(346)       Save

    China National Scientific Seafloor Observatory (CNSSO) is a major science and technology infrastructure project approved by the National Development and Reform Commission (NDRC), which aims to observe the ocean via various aspects and fields. Unlike the buoy network operated by the government, CNSSO requires smart data acquisition and control system, underwater acoustic communication, system protection and domestic instrument experiment platform. In response to the realization of these scientific goals, improvements needs to be made for the buoy platform to meet the requirement of CNSSO.

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    Analysis and Practice on the Risk of Deep water Semi-Submersible Production Platform with Condensate Oil Storage
    LIU Xiaoyan, FENGJiaguo, LI Da
    Ocean Engineering Equipment and Technology    2023, 10 (2): 43-50.  
    Abstract60)      PDF(pc) (2560KB)(333)       Save
    Deepwater gas field development is characterized by large investment and high risk. However, there is little experience in deepwater gas field development in China. Combined HAZOP, HAZID, SIL and improved expert statistical analysis method, storage platform is established from two aspects of conventional risk and specific risk. On the basis of drawing lessons on the experience of foreign experts, the research focuses on the analysis of specific risks caused by such factors as fire and explosion, column storage of large-capacity condensate oil, construction based on domestic resources, first polyester cable, first large-diameter SCR, lack of deep-water experience, etc. The potential risks of the platform are fully identified in the aspects of project management, hull structure, riser, mooring system, hull system and platform. Commissioning, and the main risk countermeasures are given to effectively implement risk management. The research provides the guidance for engineering design and implementation, and provides the reference for risk management of deepwater gas field development projects in the future.
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    UPS Sizing Calculation for Offshore Platform
    Zhi-gui GUO, Xiao-hua YAO
    Ocean Engineering Equipment and Technology    2015, 2 (3): 201-204.  
    Abstract384)   HTML2)    PDF(pc) (964KB)(330)       Save

    Uninterruptible power supply (UPS) is a key device in the electrical system on the offshore oil platform. It supplies the key loads such as the communication equipment, instrument control, electric protection, and control panels or workstation for the key machines when the normal and the emergency power supplies both fail. We deal with the calculating method for sizing of UPS and perform engineering calculation on the UPS sizing of a certain offshore platform. It is proved that the calculating method is simple and convenient, and can be used for the electrical design of other offshore oil platforms.

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    Risk Evaluation Research of Subsea Oil and Gas Pipeline Stability
    Zi-peng ZHOU, Guo-min SUN, Ning HE
    Ocean Engineering Equipment and Technology    2014, 1 (3): 195-199.  
    Abstract211)   HTML2)    PDF(pc) (814KB)(328)       Save

    Pipeline stability is an important parameter of subsea pipeline service. In order to ensure the safe operation of the subsea oil and gas pipeline, so as to a chieve the safe production and sustainable development of subsea oil and gas field, risk evaluation of the subsea pipeline is required. research the technical methodology of subsea pipeline stability risk evaluation based on the worldwide standard and engineering experience. Firstly, four objects are described regarding to the risk evaluation, i.e., risk recognition, result evaluation, frequency analysis and risk matrix. Then the risk condition and evaluation methodology of subsea oil and gas pipeline stability are researched. Finally, the risk factors of subsea oil and gas pipeline stability are summarized based on the particularity of subsea pipeline. The semiquantitative evaluation method and qualitative evaluation method are used for subsea oil and gas pipeline stability risk evaluation. The results can be used for improving the accuracy of oil and gas pipeline risk assessment and promoting the related technical progress in.

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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.  
    Abstract479)   HTML0)    PDF(pc) (2594KB)(326)       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.

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    Design of Low-Power Platform for Deepwater Riser Underwater Monitoring
    Hao BAI, Meng-na ZHANG, Xiao-hong SHEN, Hai-yan WANG
    Ocean Engineering Equipment and Technology    2015, 2 (2): 133-137.  
    Abstract292)   HTML0)    PDF(pc) (2950KB)(322)       Save

    Underwater information processing platform is the nerve center of the riser fatigue monitoring device. It controls fatigue parameters detection, signal processing, data transmission, dormancy and initiation of the monitoring equipment and a series of processes. The hardware system of the low-power-consumption underwater information processing platform consists of low-power microprocessor, high-speed digital signal processor (DSP), a variety of sensors, signal modulation and transmission circuit, power supply and other accessories and so on. In order to improve the service period of the monitoring equipment, we optimize the design of the low-power underwater information processing platform during the "Eleventh Five-Year" period. We add storage modules and optimize spatial layout and program flow to greatly reduce the circuit board area. After optimization, the reliability of the underwater information processing platform is enhanced further. And then the volume and weight of the riser monitoring system are reduced and its convenience and applicability are improved.

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