Modern Ship & Shipbuilding Terminology

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Deadweight: Deadweight tonnage or DwT is the absolute maximum weight that a ship can safely carry when fully loaded. It includes crew, passengers, cargo, fuel, water, and stores. Often expressed in long tons or metric tons. Acronym: dwt. It is measured by measuring the displacement difference when the vessel is empty (or light) and fully loaded.
Displacement Tonnage: The actual weight of a ship and its contents. One displacement ton, measuring the displacement of seawater while a ship is afloat, is equivalent to one long ton or about one cubic meter (35 cubic feet) of salt water.
Frigate: A warship used primarily for escort duty. Most frigates are between 4,000 to 9,000 displacement tons and they are often larger than destroyers but smaller than cruisers. Earlier definition of frigate
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GRT: Gross Register Tonnage is the cubic capacity of all enclosed spaces of a ship, more often used then NRT for calculating cargo capacity of a vessel. A Gross Register Ton is equal to 2.83 cubic meters or 100 cubic feet.
NRT: Net Register Tons, the true cargo capacity of a ship. NRT signifies the cubic below-deck cargo or passenger capacity used for the vessel's revenue generation only. For taxation purposes normally GRT is used. A Net Register Ton is equal to 2.83 cubic meters or 100 cubic feet.
TPI: Tons Per Inch immersion.
TPC: Tons Per Centimeter immersion.

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