Double-hulled tanker Double-hulled tanker A double-hulled tanker refers to an oil tanker which has a double hull. They reduce the likelihood of leaks occurring than in single-hulled tankers, and their ability to prevent or reduce oil spills led to double hulls being standardized for oil tankers and other types of ships including by the International Convention for the Prevention of Pollution from Ships or MARPOL Convention. After the Exxon Valdez oil spill disaster in Alaska in 1989, the US Government required all new oil tankers built for use between US ports to be equipped with a full double hull. A number of
SS Wafra oil spill record as the world's largest salvage tugs. SS Wafra oil spill The SS "Wafra" oil spill occurred on 27 February 1971, when SS "Wafra", an oil tanker, ran aground while under tow near Cape Agulhas, South Africa. Approximately 200,000 barrels of crude oil were leaked into the ocean. The larger part of the ship was refloated, towed out to sea, and then sunk by the South African Air Force to prevent further oil contamination of the coastline. "Wafra" left Ras Tanura in Saudi Arabia on 12 February 1971 bound for Cape Town, South Africa, with a cargo of (63,174 tonnes)