Abstract: In order to eliminate risks of fuel leakage in LNG-fueled vessels, a GSPN isomorphism with its MC method was proposed to simulate response process for such leakage emergencies. Firstly, leakage risks of LNG-fueled vessels were described, and emergency response process flow was developed. Secondly, GSPN model of emergency response system process and its isomorphic MC were established. Finally, simulation analysis was carried out with LNG leakage response exercise as an example, and major performance parameters, like steady state probability of the system, were obtained. The results show that problems of information accumulations tend to appear in the stages of preliminary preparation and judgment on leakage degree of LNG storage tanks. Situation judgement and summary of subsequent disposal measures take a relatively long time, and thus should be the focus of process optimization.

Key words: liquefied natural gas (LNG)-fueled vessel, contingency response, generalized stochastic Petri nets (GSPN), markov chain (MC), simulation model