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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).
In shipping, the stowage factor indicates how many cubic metres of space one tonne (or cubic feet of space one long ton) of a particular type of cargo occupies in a hold of a cargo ship. [1] It is calculated as the ratio of the stowage space required under normal conditions, including the stowage losses caused by the means of transportation and ...
The ship's hydrostatic tables show the corresponding volume displaced. [4] To calculate the weight of the displaced water, it is necessary to know its density. Seawater (1,025 kg/m 3) is more dense than fresh water (1,000 kg/m 3); [5] so a ship will ride higher in salt water than in fresh. The density of water also varies with temperature.
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 ...
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 ...
Deadweight loss, a loss of economic efficiency that can occur when equilibrium for a good or service is not Pareto optimal; Deadweight tonnage, a ship's carrying capacity, which includes cargo, fuel, crew, etc. Dead weight or dressed weight, the weight of an animal carcass after removal of skin, head, feet, visceral organs, etc.
When the ship arrives the cargo is then taken from the warehouse to the quay and then lifted on board by either the ship's gear (derricks or cranes) or by the dockside cranes. The discharge of the ship is the reverse of the loading operation. Loading and discharging by breakbulk is labour-intensive.
The net tonnage calculation is based on a number of factors, one of which is the moulded draft d.The choice of the value to use for d can be complicated. For ships subject to the International Convention on Load Lines, the Summer Load Line draft is used, with the exception of cases where that is a timber load line.