Dynamics Simulation for Process Risk Evolution Mode on Fueling of LNG-fueled Vessel

The economics and environmental friendliness of LNG fuel makes its application on LNG-fueled vessel a major trend. In view of the inherent hazardous properties of LNG, LNG-fueled vessels are extremely complex and dangerous when fueling. It is necessary to study the risk factors and the intrinsic relationship among the factors in the process of fueling operation, and to simulate the process risk of the LNG-fueled vessel. During the process of fueling of LNG-fueled vessel, the LNG-fueled vessel interacts with energy and information every phase with the surrounding environment. This paper analyzed the impact of the three interactions between the fueling operation process, ship factors and environmental factors on the risk of fueling operation, and then established a complete causal system for LNG-fueled vessels operation. By analyzing the boundary conditions of the system, the relationship between factors was established using system dynamics method. Based on the catastrophe theory(CA), the dynamics model for LNG fueling is proposed to understand the system’s risk mutation phenomenon via the tools of System Dynamics(SD). Combined with the simulation results of the case analysis, the risk evolution mode of the LNG-fueled vessel during the LNG fueling process is obtained and put forward constructive opinions for improving the fueling safety of the LNG-fueled vessel. Application examples show that a sudden catastrophe occurs, which leads to a decline in the safety capacity of the system. More safety management and preventive measures should be put in this stage to improve the safety level.