Vapour Recovery Collecting and condensing petroleum product vapours being loaded and unloaded at terminals, refineries and petrol stations. The vapours are then condensed to a liquid thereby significantly reducing air pollution. Vessel A ship used to transport crude oil, petroleum products, or natural gas products. Vessel categories are as follows: Ultra Large Crude Carrier (ULCC), Very Large Crude Carrier (VLCC), Other Tanker, and Specialty Ship (LPG/LNG). Vessel bunkering Includes sales for the fueling of commercial or private boats, such as pleasure craft, fishing boats, tugboats, and ocean-going vessels, including vessels operated by oil companies. Excluded are volumes sold to the U.S. Armed Forces. Viscosity The ability of a liquid to flow. The higher the viscosity, the slower the liquid flows. VLCC Very Large Crude Carrier. Oil tanker of over 200000 tonnes or which can carry over 1.5 mn barrels of crude. VOCs Stands for Volatile Organic Compounds. Carbon containing compounds that evaporate into the air. VOCs are a major component of air pollution, and are beginning to receive public attention as more and more products labeled "Low VOCs" hit the market.