Suezmax are medium to large-sized tankers with a deadweight tonnage (DWT) ranging between 120,000 to 200,000. They are the largest marine vessels that meet the restrictions of the Suez, and are capable of transiting the canal in a laden condition. A typical Suezmax tanker is 275 m (900 ft) long, 48 m (157 ft) wide, and 16.2 m (53 ft) in draught corresponding to about 150,000 DWT.
Very Large Crude Carriers (VLCC): VLCCs are large size tankers with deadweight tonnage ranging between 180,000 to 320,000. These tankers are capable of passing through the Suez Canal in Egypt, and as a result are used extensively around the North Sea, Mediterranean and West Africa. A VLCC can measure up to 1,540 ft (470 m) in length, up to 200 ft (60 m) in width, and has a draught of up to 66 ft (20 m).
Ultra Large Crude Carriers: ULCC or Ultra Large Crude Carriers are the largest tankers in the world with a size ranging between 320,000 to 550,000 DWT. Due to their huge size, they require custom built terminals. As a result, they are able to serve limited number of ports in the world. They are primarily used for very long distance crude oil transportation, especially from the Persian Gulf to Europe, Asia and North America. Today, ULCC are among the largest shipping vessels with standard dimensions of 415 meters length, 63 meters width, and 35 meters draught. Knock Nevis was the longest ULCC supertanker ever built in the world with dimensions of 458.4 meters length and 68 meters in width.