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Deadweight tonnage is a measure of a vessel's weight carrying capacity, not including the empty weight of the ship. It is distinct from the displacement (weight of water displaced), which includes the ship's own weight, or the volumetric measures of gross tonnage or net tonnage (and the legacy measures gross register tonnage and net register tonnage).
Gross tonnage is calculated based on "the moulded volume of all enclosed spaces of the ship" and is used to determine things such as a ship's manning regulations, safety rules, registration fees, and port dues, whereas the older gross register tonnage is a measure of the volume of only certain enclosed spaces.
Tonnage is a measure of the capacity of a ship, and is commonly used to assess fees on commercial shipping.The term derives from the taxation paid on tuns or casks of wine. In modern maritime usage, "tonnage" specifically refers to a calculation of the volume or cargo volume of a ship.
Lightweight displacement – LWD – The weight or mass of the ship excluding cargo, fuel, ballast, stores, passengers, and crew, but with water in the boilers to steaming level. Loadline displacement – The weight or mass of the ship loaded to the load line or plimsoll mark. Deadweight tonnage (DWT) is a measure of how much weight a ship can ...
OOCL G-class container ship Container ship: 399.9 m (1,312 ft) 61.3 m (201 ft) 235,341: In service COSCO Shipyard Group: OOCL: ONE Innovation: ONE I-class container ship Container ship: 399.9 m (1,312 ft) 61.4 m (201 ft) 235,311: In service Japan Marine United Corporation: Ocean Network Express: Nissei Maru: Globtik Tokyo class Supertanker
Draft marks, by showing how low a ship is sitting in the water, make it possible to determine displacement. The displacement or displacement tonnage of a ship is its weight . As the term indicates, it is measured indirectly, using Archimedes' principle , by first calculating the volume of water displaced by the ship, then converting that value ...
Cargo ships are categorized partly by cargo or shipping capacity , partly by weight (deadweight tonnage DWT), and partly by dimensions. Maximum dimensions such as length and width ( beam ) limit the canal locks a ship can fit in, water depth ( draft ) is a limitation for canals, shallow straits or harbors and height is a limitation in order to ...
List of merchant navy capacity by flag is a list of the world foremost fleets of registered trading vessels ranked in both gross tonnage (GT) and deadweight tonnage (DWT) sorted by flag state. The table is based on the annual maritime shipping statistics provided by the British Government and the Department for Transport .