Port into heavy
The port into heavy of a Navire represents the maximum loading which it can carry; it is equal to the total weight of the ship charged to the maximum (draft medium to the marks of freeboard) less its tare weight or light displacement.
The port into heavy includes the personnel (sailors and passengers, like their business), the consumable ones (fuel, vivres, drinking water, drinks, oil of the engine…), and the transported goods, which can vary during the voyage, for example the fish captured for a Fishing vessel. It takes also account of nondesired loading, as the ice being formed on the superstructures at the time of a voyage in polar zone.
The port into heavy is also a tool being used to classify the trading vessels (cargo liners, Pétrolier S…) : one often shortens it in tpl (“deadweight tonnage”), or with the English abbreviation DWT (“ deadweight let us tons ”). One speaks thus for example about a “Vraquier of 70 000 tpl”. By abuse language, one often speaks about a “ship of 70 000 tons” to speak about its port into heavy.
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