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Effect of ore liquefaction on ultra-large ore carrier design

MO Zhonghua;ZHENG Jinwei;YANG Yuan;Nantong COSCO KHI Ship Engineering Co.Ltd.;  
When the moisture content of ore cargo is beyond the transportable moisture limit prescribed by IMSBC Code,water will seep from ore cargo under the action of ship rolling and vibration,and it will produce cargo fluidization and free surface. This phenomenon is named as ore liquefaction,which will have an adverse effect on ore cargo shipping safety. From the viewpoint of ship design,the paper briefly analyses the impact mechanism of ore liquefaction effect on ship stability and structural strength. Through stability calculation and finite element analysis on a certain 400,000 ton ore ship design with ore liquefaction effect,the following conclusions can be drawn: ore liquefaction has little effect on ULOC ship stability,but it has a significant effect on local structures in cargo area,so ULOC structure need to be strengthened locally. This research gives a definite reply to question of ore liquefaction effect on ULOC design,and the analysis is also suitble for other ships in which ore liquefaction problem exist.
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