Structural Safety Assessment for Support Structure of Independent LNG Cargo Tank (IMO Type “B”) Considering High Level Reaction Force

摘要

Recently because of structural problems of LNG carrier, LNG FPSO and other LNG unit, study on IMO Type “B” LNG cargo tank (independent cargo tank) has been studied very actively in progress. IMO Type “B” LNG cargo tank is known to have structural safety for sloshing pressure and external impact compare with NO96 and Mark III LNG cargo tank. This IMO Type “B” LNG cargo tank independently consists of cargo tank, hull structure and support structure. Especially, support structures of cargo tank could experience various loading conditions related to LNG shipping. And Local reaction force of high level has influences on structural safety of cargo tank and support structures. In this study, we introduce support structures and evaluate structural safety of support structures throughout local fine mesh analysis method for independent LNG cargo Tank (IMO Type “B” LNG cargo tank of STX Offshore & Shipbuilding Co., Ltd).