Table of Content

    25 February 2016, Volume 3 Issue 1 Previous Issue    Next Issue
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    Riser Wake Model and Its Application in TTR Interference Analysis
    YANG Wei, SUN Guo-min, YANG Hu, FENG Xian-hong, LI Xu
    2016, 3 (1):  1-7. 
    Abstract ( 122 )   PDF (3683KB) ( 60 )  
    The analysis on interference between upstream and downstream risers is an important design part of riser design in deep water. After introducing different wake theories used for top tensioned riser (TTR), we build the TTR model for interference analysis with FLEXCOM software. The results obtained with different wake models are compared, showing that the clearance under Blevins model is smaller than that under Huse model. In practical engineering projects, it is recommended to choose the wake model based on environment condition for analysis and determine the riser space based on the interference analysis results and the need of well slot arrangement, etc
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    Fault Tree Analysis of the Umbilical of Subsea Production System
    XU Wen-hu, GUO Hong
    2016, 3 (1):  8-11. 
    Abstract ( 225 )   PDF (791KB) ( 46 )  
    Fault tree analysis (FTA) is applied to analyze the reliability of the subsea umbilical of a gas field in South China Sea both qualitatively and quantitively. The fault tree model of the subsea umbilical is built. The key components of the subsea umbilical are cable, sheath and armour according to the qualitative analysis result and the weakest link, also the most important component, is the cable based on the quantitive analysis result. Based on the analysis results, improvement measures focusing on the cable are put forward in terms of design, manufacturing and operation of the umbilical to reduce the risk of failure and improve the reliability of the umbilical, which is beneficial to the design and safe operation of the subsea umbilical.
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    Evaluation on Submarine Pipeline with Crack Damage and Software Development
    LI Li-wei, HAO Lin, ZHOU Wei-wei, PEI Xiao-mei, CAO Jing
    2016, 3 (1):  12-19. 
    Abstract ( 148 )   PDF (2137KB) ( 58 )  
    Submarine pipeline is the main tool for the transportation and exporting of offshore oil and gas resource. The working pipeline would suffer stress concentration and occurrence of crack, which may lead to crack propagation, due to the change of transmission medium, corrosion, fishing, dragging anchors and other activities. It is very important to evaluate the strength of the submarine pipeline with crack damage. General structure failure assessment diagram (FAD) technology and application of level 2 evaluation method in the specification BS7910—1999 are introduced. An evaluation system is developed according to BS7910—1999. Case study shows that this system can be used to quickly assess the strength of pipeline with crack damage.
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    Experimental Investigation of Printed Circuit Heat Exchanger as LNG Vaporizer
    WU Wei-wu, WANG Dong-bao, ZHAO Li-ming, YUAN Zhen-qin
    2016, 3 (1):  20-24. 
    Abstract ( 182 )   PDF (2269KB) ( 35 )  
    As a newly developed micro-channel heat exchanger, printed circuit heat exchanger (PCHE) has wide application prospects in offshore liquefied natural gas (LNG) production and floating LNG receiving terminals with compact dimensions, low weight, and high heat transfer efficiency. For the application of PCHE as main heat exchanger for LNG floating storage and regasification unit (FSRU), a scaled model of LNG vaporizer is produced and an experimental facility is built to measure the thermal performance of the heat exchanger.
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    Short-Term Response Prediction for Motion Response of Large Upper Module
    YIN Yan, LI Chun-hui, WU Xiao-yuan, WANG Chao
    2016, 3 (1):  25-30. 
    Abstract ( 130 )   PDF (3442KB) ( 24 )  
    Based on the three-dimensional potential flow theory, we study the motion response characteristics of the system of semi-submersible barge and large upper module of semi-submersible production platform under the wave force by SESAM software. Combined with operation sea state, we predict the short-term response values of the system by using the spectrum analysis method, providing theoretical basis for ensuring the safety and reliability of large upper module during the transportation process.
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    Study on Seismic Response Analysis Method for Jack-Up Platform
    LI Ning, YANG Wei, LI Xu
    2016, 3 (1):  31-38. 
    Abstract ( 90 )   PDF (4534KB) ( 19 )  
    The different seismic response analysis methods and the differences of the seismic response between the jack-up platform and other structures are introduced. The HYSY 92x jack-up platform model is built with ANSYS software, and the seismic response is analyzed with static method, response spectrum method and time-history analysis method when the secondary ground and the 8 seismic fortification intensity are considered. The analysis shows that: the response spectrum method is more conservative than the static method; the seismic response of the jack-up platform obtained with the time-history analysis method depends on the selection of seismic wave; in the leg, the stress is concentrated in the chords and the sway rods; the maximum Von Mises stress in the chords of the leg is less than the material yield strength, and the maximum displacement is 0.6 m, so the platform can resist the seismic effect. This research can provide reference for the seismic design of the jack-up platforms.
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    Dimension Sensitivity Analysis of Octagon Tank on Sloshing-Induced Slamming Load Based on Simulation
    CHEN Shi-wen, YANG Zhi-xun, RUAN Shi-lun, ZHOU Mao-fu, YUE Qian-jin
    2016, 3 (1):  39-45. 
    Abstract ( 176 )   PDF (4503KB) ( 26 )  
    In order to reduce the economic costs, the volume of cargo tank in the giant floating liquefied natural gas facility (FLNG) has been increasing with the size of vessel, which causes severe liquid sloshing. So sloshing-induced slamming is one of the key issues in the structure design of large-scale tank, and, it is an important part to select the overall dimension of tank during design process. Dimension sensitivity of octagon tank on sloshing load is analyzed. Firstly, through finite volume numerical method, numerical experiments with a series of filling level are performed to find out the most dangerous filling level, which is 30%. Based on this, sensitivity regularity of parameters is analyzed within the design scope of tank size. The results could provide reference for main dimension design of large-scale storage tank.
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    Research of Droppable Ballast Device of Manned Submersible Based on Computer-Aided Ergonomics Design
    REN Yu-gang, LI De-wei, GAO Xiang, TANG Jia-ling, SHI Xian-peng, JING Chun-lei, YANG Lei
    2016, 3 (1):  46-51. 
    Abstract ( 164 )   PDF (3735KB) ( 60 )  
    Aiming at the practical application problems of droppable ballast device, we carry out the optimization and research of droppable ballast device on the "Jiaolong" manned submersible based on ergonomics principle. The device is designed according to ergonomics standard, and computer-aided design technologies are used in the design. The whole process of analyzing, planning, and designing of droppable ballast device optimization will play an active role in inspring the ergonomics analysis and design of marine technologies and equipment.
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    Development of an Auto On-Off Pouring Mold Used in Field Joint Installation of GSPU Thermal Insulation Pipe
    JIA Zhen
    2016, 3 (1):  52-57. 
    Abstract ( 249 )   PDF (3138KB) ( 36 )  
    In view of the field joint structure and construction requirements of glass microsphere syntactic polyurethane (GSPU) deepwater insulation pipes, a set of 3-valve type pouring mold that can open and close automatically driven by pneumatic cylinders is designed. In order to improve the quality of field joint installation as well as mold practicability, the structure is improved and optimized correspondingly. Based on this designing scheme, a physical mold is manufactured and then the pouring test is carried out using the mold. The results show that this pouring mold, to some extent, is able to improve the field joint installation quality while guaranteeing the construction efficiency of field joint installation. Besides, the material and personnel investment is reduced, lowering the composite cost for field joint installation.
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    An Overview of Subsea Production Control System
    ZUO Xin, YUE Yuan-long, DUAN Ying-yao, GUO Long-chuan
    2016, 3 (1):  58-66. 
    Abstract ( 136 )   PDF (1789KB) ( 69 )  
    Subsea production control system is among the most important equipment applied in subsea oil and gas development community. According to the construction distinction of subsea production control systems, there are totally eight typical control architectures, i.e., direct hydraulic control system, piloted hydraulic control system, sequential hydraulic control system, direct electro-hydraulic control system, multiplexed electro-hydraulic control system, all-electric control system, powered autonomous remote control system and integrated control buoy. For all these configurations, we explore the emerging background, structure characteristics, operation principle, application ranges, advantages and drawbacks. Finally, the main factors influencing the control system design are analyzed. This research can provide somewhat directive significance for the independent development of our subsea production control systems in the future.
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    Simulation Study on Lumped Parameter Model of Umbilical Cable Power Line
    LIU Ying, ZUO Xin, DU Jian, WANG Xin, CAO Hai-liang, LIU Hai-jun
    2016, 3 (1):  67-72. 
    Abstract ( 193 )   PDF (2632KB) ( 27 )  
    Subsea power line communication, as one of the main communication methods of subsea control system has a direct influence on the safety and cost of the subsea oil and gas exploitation. Umbilical cable power line is the carrier of subsea power line communication, of which the analysis on characteristics plays a vital role. As for a 30 km umbilical cable power line, state space model is established with the lumped parameter method, and the rlgc (resistance, inductance, conductivity, and capacitance) measured data of a subsea gas field is introduced into the system. The electrical characteristics of power line are researched further using the MATLAB software, and the selection principle of section number for π model is determined. The result of this study has a certain reference value for the channel design of subsea power line communication.
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