Inert gas

Gas or a mixture of gases containing insufficient amount of oxygen to support the combustion of hydrocarbons, a gas or a mixture of gases which will not react with the cargo. Inert gas may be produced by boilers (flue gas system), inert gas generators with independent burners, nitrogen generators or other equipment. The inert gas is used onboard gas tankers for various purposes including the drying and inerting of the cargo tanks prior to cooling-down or after heating, the gas freeing and scavenging of the cargo piping, the topping-up of the cargo tanks to prevent the ingress of air when carrying some specific substances and to provide the environmental control of atmosphere around cargo tanks.

Further reading: IMO Guidelines for Inert Gas Systems

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