In the late 1920th transportation of liquefied gases in bulk started. In the very beginning it was transportation of propane and butane in fully pressurised tanks. When the steel quality became better and the knowledge about propane and butane was better they started to carry those liquefied gases under temperature control. From the mid-1960th we have carried fully refrigerated liquefied gases and now the biggest gas carriers are more than 125 000 m3. Liquefied gas is divided into different groups based on boiling point, chemical bindings, toxicity and flammability. The different groups of gases have led to different types of gas carriers and cargo containment system for gas carriers.
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