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Large Tankers. Semi-trailer is the tanker configuration with the largest load-carrying capacity, up to 9,100 gallons (34,447 liters). The other trailer configurations, being somewhat heavier, can carry less and have capacities up to 8,900 gallons (33,690 liters).
Supertankers are the largest tankers, including very large crude carriers (VLCC) and ULCCs with capacities over 250,000 DWT. These ships can transport 2,000,000 barrels (320,000 m 3) of oil/318,000 metric tons.ith the exception of the pipeline, the tanker is the most cost-effective way to move oil today. Worldwide, tankers carry some 2 billion barrels (3.2 Ã 10 11 l) annually, and the cost of transportation by tanker amounts to only US$0.02 per gallon at the pump.