Configuration for ocean vessels, usually those that carry oil, designed to minimize spillage in case of a puncture (the type of damage that causes 70% of maritime oil disasters). After the Exxon Valdez ran aground in Prince William Sound in March 1989, spilling more than 11 million gallons of oil into Alaska waters, the Oil Pollution Act of 1990 and various international maritime regulations that followed mandated that all ships used to transport oil will have double hulls by the year 2020. (Well, you can't tell companies what kind of equipment to use in their operations, but when the US declares that single hulled vessels won't be allowed in their territorial waters....) Of course, it is possible to design a double hulled oil tanker that still leaks when punctured-- an option if you wanted to obey the letter of the law yet minimize costs (9-17% in building; 5-13% in operating; more for retrofitting domestic tankers--'course you could pass that 10 cents a barrel onto your consumers) by leaving out a few bulkheads. (A tanker also needs longitudinal subdivision through the cargo tanks for the double hull design to be safer)

Source: Wolcott, et. al., Double Hull Tanker Legislation: An Assessment of the Oil Pollution Act of 1990, National Academy Press, 1998.

Log in or registerto write something here or to contact authors.