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    25 December 2017, Volume 4 Issue 6 Previous Issue    Next Issue
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    ZHONG Wen-jun
    2017, 4 (6):  315-316. 
    Abstract ( 163 )   PDF (151KB) ( 82 )  
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    Current Status and Characteristics of Semi-Submersible Crane and Pipe-Laying Vessel
    CHEN Rong-qi, PENG Xiao-jia
    2017, 4 (6):  317-321. 
    Abstract ( 283 )   PDF (2811KB) ( 170 )  
    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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    Outline of General Arrangement for Semi-Submersible Crane and Pipe-Laying Vessel
    ZHONG Wen-jun, PENG Xiao-jia, HE Ning
    2017, 4 (6):  322-325. 
    Abstract ( 284 )   PDF (3106KB) ( 95 )  
    Semi-submersible crane vessel (SSCV) is one of the most important equipment to develop deepwater oil and gas field. With a lot of equipment on board, the general arrangement plan needs to consider the ship's seakeeping performance, stability, structure strength, equipment layout, construction difficulty, cost and other factors, so it is a tough assignment. We summarize the experience in ship hull optimization, deck box arrangement, column arrangement, and pontoon arrangement. Such a research may provide a reference for further domestic study.
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    Study on Pipeline J-Lay Analysis with Deepwater Semi-Submersible Crane J-Lay Vessel
    HE Ning, ZHAO Dang, WANG Hui
    2017, 4 (6):  326-330. 
    Abstract ( 158 )   PDF (407KB) ( 81 )  
    The important design parameters for deepwater semi-submersible crane J-lay vessel are analyzed. Firstly, we investigate the existing J-lay vessels and typical pipeline J-lay projects. And then we check the pipe outer diameter and wall thickness under different water depths based on related standards. The pipe laying efficiencies with different work stations and unit section pipe lengths are compared. Finally, we get the required function for the proposed J-lay vessel design.
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    Dynamic Positioning Capability Analysis of Semi-Submersible Crane and Pipe-Laying Vessel
    ZHANG Fa-fu
    2017, 4 (6):  331-337. 
    Abstract ( 163 )   PDF (7413KB) ( 84 )  
    Considering the important role of dynamic positioning (DP) capability analysis in ship design, DP capability of deepwater semi-submersible crane and pipe-laying vessel is analyzed. Environmental loads in operation condition are calculated with software calculation results corrected by wind tunnel test coefficients of the same type vessel. According to the selected thruster configuration and failure mode, DP capability of 14 conditions is calculated, and the DP capability plots are shown. The results show that the thruster configuration is reasonable to meet the design conditions.
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    Functional Requirement Analysis for the Deepwater Heavy Lifting Operation
    ZHAO Jie, PENG Xiao-jia, HE Ning, AN Da-wei
    2017, 4 (6):  338-342. 
    Abstract ( 171 )   PDF (4255KB) ( 93 )  
    Deepwater heavy lifting and subsea structure installation are the most important function of the deepwater semi-submersible crane and pipe-laying vessel, and reasonable function orientation of the main crane is essential to the design of the whole ship, the investment of the whole ship, and the market competitiveness. The weights of the offshore platforms and the subsea structures in China and abroad are statistically analyzed. The weights of the platforms at the East China Sea and the South China Sea are analyzed separately. The lifting analysis for platform at the target weight is conducted and the functional requirement analysis of the lifting operation is completed.
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    Application of Closed-Ring Power System in Large Engineering Vessel
    ZHAO Jian-yu, TANG Yi
    2017, 4 (6):  343-346. 
    Abstract ( 156 )   PDF (1097KB) ( 105 )  
    The application of large engineering ship in marine engineering field is more and more extensive. But the energy saving problem of large power systems in large engineering ships is becoming increasingly prominent. Closed-ring running model in power system is a new design concept for energy saving and consumption reduction, and the reliability of the system is guaranteed. We introduce the advantages and disadvantages of closed-ring power system in detail. Several problems in the design stage when the closed-ring power system is applied to large engineering ship are also pointed out.
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    Mooring System Design of a Semi-Submersible Crane and Pipe-Laying Vessel
    SONG An-ke, HE Ning, ZHONG Wen-jun, CAI Yuan-lang
    2017, 4 (6):  347-351. 
    Abstract ( 136 )   PDF (615KB) ( 92 )  
    We review the frequency domain dynamic analysis method of mooring system, and apply it to the mooring system design of a semi-submersible crane and pipe-laying vessel (SSCV) in design environment conditions. Analyses are performed for the mooring system in operating condition and for the thruster assisted mooring (TAM) system in standing-by condition. Results of the analyses are used for the determination of mooring equipment, and mooring line strength check is carried out according to the partial safety factor format in Det Norske Veritas (DNV) code.
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    Study of Living Quarters Construction Technology for Semi-Submersible Crane and Pipe-Laying Vessel
    WANG Kuo, LIU Lei, ZHOU Wu, LIU Guang-hui, CHEN Pin
    2017, 4 (6):  352-357. 
    Abstract ( 158 )   PDF (1579KB) ( 75 )  
    Living quarters are important components of offshore platform's topside. Appropriate construction technology of living quarters is critical for reducing the construction cost of offshore platform construction projects. According to the characteristics of living quarters such as large dimension, weakness of structure strength and complex cabin, taking a semi-submersible crane and pipe-laying vessel as an object, we study the integration technology and accuracy control in panel pre-fabrication, integration, and assembly phase, and analyze its advantages and precaution. Through the research, the construction efficiency of large living quarters will be improved, the assembly time will be reduced, and the construction cost will be saved.
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    Docking Block Design Optimization Method for Deepwater Semi-Submersible Crane and Pipe-Laying Vessel
    WANG Xi-wei, JIANG Li-qun, LIU Guang-hui, LI Yong, PANG Jian-tao
    2017, 4 (6):  358-361. 
    Abstract ( 160 )   PDF (1203KB) ( 112 )  
    A docking block design optimization method for the deepwater semi-submersible crane and pipe-laying vessel is introduced. This method includes the optimization design of docking block layout and size, the optimization design of docking block under multi-objective conditions and the robust design in the presence of uncertain quantity. By adopting the above method, the layout of the docking block can be optimized, and the materials can be saved in the condition of ensuring security and reducing deformation.
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    Comparative Research of Integration Method in Dock for Deepwater Semi-Submersible Crane and Pipe-Laying Vessel
    JIANG Li-qun, WANG Xi-wei, LIU Guang-hui, LI Yong, SHEN Yu-ji
    2017, 4 (6):  362-368. 
    Abstract ( 102 )   PDF (2109KB) ( 70 )  
    Several normal semi-submersible offshore platform integration methods in dock, including deepwater semi-submersible crane and pipe-laying vessel, are introduced, and their advantages and disadvantages are compared. In consideration of shipyard equipment and facilities, we analyze a typical jack-up and skidding integration method. This research could give reference for the optimization of semi-submersible platform jack-up and skidding integration scheme.
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    Weight Control of Deepwater Semi-Submersible Crane and Pipe-Laying Vessel Construction
    CHEN Pin, FAN Xiang-bin, WANG Cheng-lin, GUO Peng, LIU Peng
    2017, 4 (6):  369-372. 
    Abstract ( 128 )   PDF (1296KB) ( 60 )  
    The light weight and center of gravity (CoG) of semi-submersible crane and pipe-laying vessel (SSCV) are very important for its function. With the increase of tonnage, light weight and CoG should be controlled for vessel normal function. We introduce the classification of the SSCV weight, the significance of weight control, and the method of weight control in construction period. Moreover, the way to solve overweight of the vessel is described in detail.
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    Research on the Towing Resistance of a Semi-Submersible Crane and Pipe-Laying Vessel Unlocking
    SUN Shi-long, XU Shan-hui, LIU Guang-hui, YANG Tao, ZHUANG Hong-chang, WANG Cheng-lin
    2017, 4 (6):  373-376. 
    Abstract ( 181 )   PDF (366KB) ( 73 )  
    Due to different shipyard conditions and location environment conditions of different shipyards, the unlocking method for semi-submersible crane and pipe-laying vessel varies. The impact of load caused by wind, wave, and flow must be taken into account during the unlocking process. In order to ensure safe unlocking, it is important to solve the problem of calculating the towing resistance. We analyze three different calculation methods for towing resistance, i.e.,the one based on empirical formulas, the one based on the dynamic model of wind and flow, and the one based on Guidelines for Towage at Sea. The calculation results obtained by these methods are compared. Suggestions are given on the basis of analysis results.
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    Contents of Vol.4, No.6, 2017
    OEET Editorial Office
    2017, 4 (6):  6001. 
    Abstract ( 107 )   PDF (156KB) ( 50 )  
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