Knowledge Base

Tonnage

Tonnage of the ship the size of units of measurement can be divided into two kinds of weight tonnage and volume of tonnage.
(A) the weight of the ship's tonnage
The weight of the ship, said the ship tonnage is the weight of a unit of measurement of 1,000 kilograms a tonne, or 2240 pounds for a long ton, or 2000 pounds for a short ton. At present the international community as a multi-use metric units of measurement. The weight of the ship's tonnage, displacement tonnage and dwt can be divided into two kinds.
(B) The displacement tonnage
Displacement tonnage of the ship in the water by boiling water row the tonnage, but also its own weight tonnage of the ship. Displacement tonnage displacement can be divided into light and heavy displacement and actual displacement of three kinds.
(1), also known as the paradise of light displacement tonnage, the ship itself, together with the crew and the necessary supplies the weight of the sum of the three items, the minimum weight of the ship.
(2) re-displacement is also called full-load displacement is the ship carrying passengers, cargo load line after the draft, when the highest weight, that is, the maximum weight of the ship.
(3) the actual displacement of the ship for each voyage, after loading the actual displacement.
Displacement formula is as follows:
Displacement (L t) = L * W * draft * side-mode coefficient (cubic feet) / 35 (seawater) or 36 (freshwater) (cubic feet)
Displacement (tonnes) = L * W * draft * side-mode coefficient (m3) / 0.9756 (seawater) or 1 (freshwater) (cubic meters)
Displacement tonnage can be used to calculate the ship's DWT; in shipbuilding, the basis of displacement tonnage we can see the ship's weight; in statistical warship fleet size and, generally, subject to light displacement; ships through the Panama Canal, to the actual displacement as a sign tax basis.
2, dwt (abbreviated as D.W.T.)
Ships in operation that can be used in load capacity. Dwt can be divided into the total and net DWT dwt.
(1) Total dwt. Refers to the load line marking requirements under the ship can carry the maximum weight, which includes the cargo of the ship on board the necessary fuel, fresh water, and other materials, the weight of the total reserves.
Total dwt = full load displacement of a Bareboat displacement
(2) Net DWT (abbreviation D.W.C.T.). Refers to the amount of cargo the ship can limit the weight of large, also known as the cargo weight tons, from the ship's total tonnage of the ship during the voyage in less need for reserves of fuel, fresh water, and other reserves of the weight derived from the difference.
Dwt ship can be used for cargo statistics; for a charter on the basis of the calculation of rents; said the ship's carrying capacity; also be used as new ship construction costs and the old vessels of the unit selling price.
(B) the volume of tonnage of the ship's
Volume of tonnage of ships that the ship is the volume of the unit, also known as registered tons, is the sea state registration requirements for a ship in tonnes for the calculation and measurement units to 100 cubic feet or 2.83 cubic meters as a registered tons. Volume of t can be divided into two kinds of volume of tonnage and volume of NRT.
1. Volume of gross tonnage (abbreviated as GRT).
Also known as GRT refers to the cabin and decks are all closed places of interior space (or volume) of the sum is 100 cubic feet or 2.83 cubic meters equivalent to a ton of the quotient obtained.
Volume of gross tonnage of the use of very broad, it can be used in the state's merchant fleet statistics; show that the size of the ship; for ship registration; for the Government to determine the shipping industry, shipbuilding subsidies or allowance: is used to calculate insurance premiums, shipbuilding costs and the ship's compensation.
2, volume NRT (abbreviated as NRT).
Also known as the registration of NRT, is deducted from the gross tonnage volume of business that do not use the space for the remaining tonnage of Li, that is, can be used to load cargo ship converted into the volume of tonnage.
Volume of NRT is mainly used for the ship's customs, customs clearance; as the ship to port the various taxes and fees paid basis; as a shipping canal through the canal to pay fees based on time.

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