Oil tanker - Wikipedia, the free encyclopedia - 0 views
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Oil tankers are often classified by their size as well as their occupation. The size classes range from inland or coastal tankers of a few thousand metric tons of deadweight (DWT) to the mammoth ultra large crude carriers (ULCCs) of 550,000 DWT.
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The expense was significant: for example, in the early years of the Russian oil industry, barrels accounted for half the cost of petroleum production.[10]
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While a typical T2 tanker of the World War II era was 532 feet (162 m) long and had a capacity of 16,500 DWT, the ultra-large crude carriers (ULCC) built in the 1970s were over 1,300 feet (400 m) long and had a capacity of 500,000 DWT.[29]
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"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 m3) of oil/318 000 metric tons.[46] By way of comparison, the United Kingdom consumed about 1.6 million barrels (250,000 m3) of oil per day in 2009.[47] ULCCs, commissioned in the 1970s, were the largest vessels ever built, but the longest ones have already been scrapped; only a few ULCCs remain in service, none of which are more than 400m long.[48] Because of their great size, supertankers often can not enter port fully loaded.[28] These ships can take on their cargo at off-shore platforms and single-point moorings.[28] On the other end of the journey, they often pump their cargo off to smaller tankers at designated lightering points off-coast.[28] A supertanker's routes are generally long, requiring it to stay at sea for extended periods, up to and beyond seventy days at a time.[28]
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As demand grew moderately in the United States and Western Europe, expanding economies such as China fueled exponential growth in demand.[60]
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The average one-year time charter rate for a 5-year-old tanker of 280,000 metric tons of deadweight varied from $56,500 per day in December 2005 to $53,000 per day in September 2007 with a high of $64,500 per day in September 2006.[59]