한국형 LNG 선 화물창 개발을 위한 목업탱크의 안전성 검증

Korea’s first LNG (Liquefied Natural Gas) cargo containment system has been developed since 2004. In process of acquiring certification from classifications, stability evaluation of the system is necessary. There have been lots of structural calculations, building an open mock-up and experiments about insulation panels, etc. However, more realistic data which guarantee the stability of the system during operation has been required, and it has been recognized that a closed mock-up tank could clarify most doubts about the stability of the system. Closed mock-up tank consists of steel piles, soil, concrete mat and steel hull, and is full of LNG in it. Steel piles and soil have been modeled by spring elements, steel hull by shell elements and LNG by acoustic elements and spring elements equivalent to the gravity. The model has been analyzed for three cases such as normal operation case, wind load case and safe shutdown earthquake case.