Structural Safety Assessment for FLNG-LNGC System During Offloading Operation Scenario

作     者：HU Zhi-qiang ZHANG Dong-wei ZHAO Dong-ya CHEN Gang 

作者机构：State Key Laboratory of Hydraulic Engineering Simulation and Safety Tianjin University Tianjin 300072 China State Key Laboratory of Ocean Engineering Shanghai Jiao Tong University Shanghai 200240 China Marine Design & Research Institute of China Shanghai 200240 China Nantong COSCO KHI Ship Engineering Co. Ltd Nantung 226005 China 

出 版 物：《China Ocean Engineering》 (中国海洋工程（英文版）)

年 卷 期：2017年第31卷第2期

页      面：192-201页

核心收录：

学科分类：0820[工学-石油与天然气工程] 081505[工学-港口、海岸及近海工程] 08[工学] 0815[工学-水利工程] 082003[工学-油气储运工程] 

基　　金：financially supported by the State Key Laboratory of Hydraulic Engineering Simulation and Safety,Tianjin University(Grant No.HESS-1404) the National Natural Science Foundation of China(Grant No.51239007) 

主　　题：collision FLNG LNGC numerical simulation model test side-by-side offioading cargo containment system 

摘      要：The crashworthiness of the cargo containment systems （CCSs） of a floating liquid natural gas （FLNG） and the side structures in side-by-side offioading operations scenario are studied in this paper. An FLNG vessel is exposed to potential threats from collisions with a liquid natural gas carrier （LNGC） during the offioading operations, which has been confirmed by a model test of FLNG-LNGC side-by-side offioading operations. A nonlinear finite element code LS-DYNA is used to simulate the collision scenarios during the offioading operations. Finite element models of an FLNG vessel and an LNGC are established for the purpose of this study, including a detailed LNG cargo containment system in the FLNG side model. Based on the parameters obtained from the model test and potential dangerous accidents, typical collision scenarios are defined to conduct a comprehensive study. To evaluate the safety of the FLNG vessel, a limit state is proposed based on the structural responses of the LNG CCS. The different characteristics of the structural responses for the primary structural components, energy dissipation and collision forces are obtained for various scenarios. Deformation of the inner hull is found to have a great effect on the responses of the LNG CCS, with approximately 160 mm deformation corresponding to the limit state. Densely arranged web frames can absorb over 35% of the collision energy and be proved to greatly enhance the crashwo- rthiness of the FLNG side structures.