LPG Vessels

They transport a large selection of gas and petrochemical products (ethylene, ethane, propylene, etc.) and ammonia and actual LPG gases (butane gas, propane gas). Moreover, especially the large LPG vessels may transport clean petroleum products (CPP), which are in fact oil products normally transported by product tankers. LPG ships are different than other tankers since the products carried require low temperatures and/or high pressure in order to be liquid. In order for the gasses to be liquid they require a temperature between -1 degree Celsius and -104 degree Celsius. Liquid gas, which takes up about 1/500 of the space of vaporized gas, is the most economical form of transportation. The liquid form is achieved through cooling, high pressure or a mixture thereof. In order to transport the gas under pressure, this form of transportation is restricted to the small LPG vessels due to the weight of the tanks. The largest vessels only transport cooled gases.