Also known as: Ultra large crude carrier
ULCC tankers are in the range of 320-560 DWT. They are used exclusively for crude oil shipping.
ULCC crude tankers are typically used on long-haul routes. They can not go through the Panama or Suez Canals. They are also draft limited in which ports they can enter. Frequently, draft limits are avoided by lightering cargoes onto or off of ULCCs using smaller ships.