ABSTRACT

The International Marine Organization(IMO) has reinforced the limitation of emission gases such as NOx and SOx. In line with this trend, the interest in the use of LNG as fuel is increasing. LNG bunkering infrastructures should be built in order to activate LNG fueled ships. The LNG bunkering terminal located onshore has the disadvantage that it can only be installed in confined areas that meet strict criteria. Floating offshore LNG bunkering terminal(FLBT) is recommended with respect to capacity and bunkering location, and short construction period compared with land equipment. Unlike the conventional LNG carriers where filling ratio is limited to remain above or below the certain filling levels, the FLBT requires the operations without any filling limitation. Therefore, it is important to estimated partial filled sloshing impact loads on cargo hold for FLBT system. To avoid the violent internal liquid motion in cargo holds, it is designed that FLBT has the 2-row arrangement that has smaller breadth compared to the single-row arrangement. Furthermore, the sloshing impact pressure in cargo holds should be examined through model tests according to reliable sloshing assessment process recommended by the Class Societies. In this study, the sloshing load for a cargo holds for FLBT was analyzed through experiments and numerical analysis. Sloshing impact pressures on the cargo holds were investigated through model tests. CFD analysis using regular motion was performed before the sloshing experiment for efficient pressure sensor position. Afterwards, a series of experiments was performed for various filling conditions under irregular 6-DOF excitations. As a result of the sloshing model tests, the sloshing impact load was not significant even in partial filling conditions. A feasibility study for 1-row arrangement for the FLBT was performed since the risk of sloshing for 2-row arrangement was not considered to be large. A comparison was made between 2-row and 1-row arrangement using ABS-Slosh, and a study was conducted according to the lower chamfer size. The increased lower chamfer height seems to give beneficial effect on the reduction of sloshing loads.

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