Abstract
Marine gas-freeing is a seldom-examined operation that takes place on board oil tankers ahead of some cargo transitions and tank maintenance/inspection cycles. Since the introduction of inert gas systems (IGS), tanker explosions have been minimised, but the issue of toxic vapours inside the tank still exists. Another issue relating to gas-freeing concerns the actual time required to ensure gas-free conditions; there are no regulatory considerations for the minimum times for gas-freeing, which stands in contrast to regulations concerning other areas on board a vessel.Through the use of modern computational methods, gas-freeing processes have been modelled and simulated in order to determine the progression of gas-freeing with regards to examining the concentration and distribution of vapours inside the tank during the procedure, as well as studying the decrease in total average concentration with regards to forming a simple qualitative model to predict the time required to gas-free given certain initial conditions.
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