These movements are made using a number of different modes of transportation. Oil and gas are transported across the water in barges and tankers . On land oil and gas are moved using pipelines , trucks, and trains.
Product tankers carry refined products from refineries to terminals.
Tankers range in size from the small vessels used to transport refined products to huge crude carriers. Tanker sizes are expressed in terms of deadweight or cargo tons. The smallest tankers are General Purpose which range from 10 to 25,000 tons. These tankers are used to transport refined products. The larger ships are used because they reduce the cost to transport a barrel of crude oil.