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Gross tonnage. Gross tonnage is calculated by measuring a ship's volume (from keel to funnel, to the outside of the hull framing) and applying a mathematical formula. Gross tonnage (GT, G.T. or gt) is a nonlinear measure of a ship's overall internal volume. Gross tonnage is different from gross register tonnage. [ 1 ]
Standard displacement, also known as "Washington displacement", is a specific term defined by the Washington Naval Treaty of 1922. [ 11 ] ". It is the displacement of the ship complete, fully manned, engined, and equipped ready for sea, including all armament and ammunition, equipment, outfit, provisions and fresh water for crew, miscellaneous ...
Shaft Horsepower (SHP) – The amount of mechanical power delivered by the engine to a propeller shaft. One horsepower is equivalent to 746 Watts. Tonnage – a number derived from any of several methods to calculate the volume or other number indicative of a ship's cargo carrying capacity. Gross tonnage – GT – Not expressible in units of ...
Depending on design requirements, some ships have extremely large internal volumes in order to serve their duties. Gross tonnage is a monotonic and 1-to-1 function of the ship's internal structural volume. It does not include removable objects placed outside the deck or superstructure, like the shipping containers of a container ship.
In modern maritime usage, "tonnage" specifically refers to a calculation of the volume or cargo volume of a ship. Although tonnage (volume) should not be confused with displacement (the actual mass of the vessel), the long ton (or imperial ton) of 2,240 lb is derived from the fact that a " tun " of wine typically weighed that much.
Gross register tonnage (GRT, grt, g.r.t., gt), or gross registered tonnage, is a ship's total internal volume expressed in "register tons", each of which is equal to 100 cubic feet (2.83 m 3). Replaced by Gross Tonnage (GT), gross register tonnage uses the total permanently enclosed capacity of the vessel as its basis for volume.
Gross tonnage and displacement are not equivalent and vary depending on the type of ton (e.g. metric or imperial) and how they are calculated. How gross tonnage is calculated has changed somewhat over time, but has always been a measure of cargo space (i.e., it is a measure of the volume of the cargo space), and figures for displacement also ...
Net tonnage (NT, N.T. or nt) is a dimensionless index calculated from the total moulded volume of the ship's cargo spaces by using a mathematical formula. Defined in The International Convention on Tonnage Measurement of Ships that was adopted by the International Maritime Organization in 1969, the net tonnage replaced the earlier net register ...