ABSTRACT:

Green ship using LNG for fuel has emerged as new trend recently due to increasing environmental regulations in the world. This is the reason for continuous active research of LNG Tank. IMO type " B" independent LNG cargo tank has received attention in order to get over limitation of membrane type LNG cargo tank. In this paper, global FE analysis was carried out in order to find out structural considerations of IMO type ‘B’ LNG cargo tank.

INTRODUCTION

The demands for natural gas as clean energy are rapidly increasing worldwide. Such demand is due to the increase in the construction of large LNG Carrier and LNG Floater. The demands of natural gas in energy market have been growing for last severe years, and the growth continues for next few decades. For the reason, the construction orders for large LNG Carrier and Floater are continued. Since the medium to long-term forecasts predict a shortage of LNG in onshore production base, offshore LNG production has been emerging as alternative for the future. Market of membrane type cargo containments system (CCS) is strong for LNG Carriers. However, constraints of NO96 Type CCS have been reported like filling limit caused by sloshing impact and vulnerableness to external impact. For the reason, many concerns are focused on IMO type " B" independent cargo tank for LNG FPSO, arctic LNG Carrier and fuel tank of LNG fueled vessels. As IMO type " B" tank can be filled partially and strong on sloshing impact and external impact, the tank is especially taken into account appropriate for LNG FPSO and arctic LNG Carrier. In this study, strength and buckling assessment for STX's own IMO type " B" Tank (ITS: Independent Tank of STX) was carried out by global FE analysis using Floating Offshore Liquefied Gas Terminals Program (FLGT) of ABS.

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