Risk-based Analysis of Pressurized Vessel on LNG Carriers in Harbor

Abstract

The need to understand the associated risks of pressurized vessels and their consequences onboard ship is imperative. The handling and storage of Liquefied Natural Gas (LNG) mostly result in catastrophic accident with associated consequences. To quantify these consequences in terms of death and degree of burn depends on the tank structures and pressure control mechanism onboard LNG carriers in a harbor. In this research, the result of the potential risks and damage consequences of the LNG fire accident in terms of the degree of burns and fatality is presented. The probability of death, first and second degree of burn injuries are assessed using consequence modelling technique, while the pool fire was modelled using the Boiling Liquid Expanding Vapour Explosion (BLEVE) approach. The result shows that at 30 meters from the flame radius, the probabilities for first-degree burn, second-degree burn, and death decrease, respectively. A sensitivity analysis revealed that at the initial heat flux and closer distance of 5m to 10m from the flame radius at the point of the accident, the death rate, first degree, and second-degree burns increase significantly. Therefore, installing a safety system and best practices that will mitigate these risks to as low as reasonably possible should be incorporated into the system design.