There is a growing need for LNG bunkering system development with increasing demand for LNG fuel. The application of LNG bunkering system allows the LNG mined from the offshore plant to be transported directly to the LNG carrier hold at sea. The LNG bunkering system requires various safety modules to safely transport the LNG at cryogenic temperature. The swivel joint of the LNG bunkering system is a safety module to prevent excessive stress due to external forces by not restraining the rotational motion of the flexible hose line. In this study, the structural strength of an 8-inch swivel joint was evaluated based on the design load conditions of OC-IMF, the international design specification for crude oil and LNG transport systems. For evaluating the structural strength, the three dimensional finite element model of 8-inch swivel joint was generated and finite element analysis was carried out considering the OC-IMF design load conditions. Reliability analysis was performed using Monte Carlo simulation(MCS) in order to improve design safety by considering uncertainty of operating environment. In the reliability analysis, the reliability level of structural strength results according to the variation of the design load in the ocean were evaluated.
and heat transfer characteristics of structural members.