What different between Gross Tonnage Summer DWT of vessel?

• Gross Tonnage:
  • It is the total size of the vessel, expressed in terms of volume, of the enclosed area within the ship, right from the keel to the funnel.
  • It is calculated using the formula: Gross tonnage (GT) = K1 x V, where K1 = 0.2 + 0.02LogV, and V + total number of enclosed spaces in cubic meters.
• Net Tonnage:
  • It is the molded volume of the entire cargo space of the ship.
  • It only considers the volume of the vessel that can be used for loading the cargo.
  • It is usually around 30% less than its gross tonnage.
  • It is calculated using the formula: Net tonnage = k2 x Vc x (4d/3D)^2 + k3 x (N1 + N2/10).
• Deadweight Tonnage:
  • It is the measurement of a ship’s contents, including cargo, fuel, passengers, crew, food, and water.
  • It is measured in long tons of 2,240 pounds (approximately 1,016 Kilograms).
• Displacement Tonnage:
  • It equals the volume of water the ship displaces while floating.
  • It is measured in cubic meters.
  • It is the actual weight of the ship.

• Draft:
  • distance from the waterline to the keel, how much of the ship is typically submerged
  • measure from the bottom of the boat to the water surface
• Displacement:
  • how much water the vessel moves out of the way (displaces) to make room for the ships hull in the water
  • given in weight of the water moved
  • equal to the weight of the vessel itself
  • if the vessel doesn’t displace as much water as the vessel weighs, it will sink
• Tonnage:
  • how much cargo a ship can carry
  • an assortment of tonnage measures depending on the need
  • Deadweight tonnage: Displacement minus the weight of the empty hull
  • Gross tonnage: measure of the volume of all enclosed spaces of a ship and is used for regulations on crew, safety regulations, and some fees
  • Net Tonnage: measure of the revenue earning (cargo/passenger carrying) space of the ships hull and is used to figure out port fees
  • Gross tonnage and Net tonnage have nothing to do with the actual mass of the ship or the cargo that it carries, they are measures for regulatory purposes not physical measures

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• Gross Tonnage
  • Gross tonnage is a measure of a ship’s size derived from its volume V (not mass, despite the name).
  • It is calculated as follows: V * ((log10(V) / 50) + 0.2).
• Displacement
  • A more modern measurement of displacement which is the weight of the volume of water displaced by the boat, which equals the mass it can float.
• Deadweight Tonnage
  • An actual measure of the shipped cargo’s mass using units of weight in the conventional way.

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What are the regulations for tonnage measurements?

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How do different tonnage measurements compare to each other?

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How is Net Tonnage calculated?

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What is the difference between Deadweight Tonnage and Gross Tonnage?

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What is the calculation used to determine a vessel's Gross Tonnage?

• Deadweight Tonnage:
  • Expresses the number of tons of 2,240 pounds that a vessel can transport of cargo, stores, and bunker fuel.
• Gross Tonnage:
  • Applies to vessels, not to cargo.
  • It is determined by dividing by 100 the contents, in cubic feet, of the vessel’s closed-in spaces.
  • A vessel ton is 100 cubic feet.
• Gross register tonnage or gross tonnage (GT):
  • Represents the total internal volume of cargo vessels.
• Net register tonnage (NRT):
  • Expresses a ship’s cargo volume capacity expressed in “register tons”, one of which equals to a volume of 100 cubic feet (2.83 m3).
• Gross tonnage:
  • Is deduced from the volume of all the spaces of the ship contained within the hull, bulkheads and decks, in accordance with the 1969 International Convention on Tonnage Measurement of Ships.
• Gross registered tonnage (GRT):
  • Is the volume of space within the hull and enclosed space above the deck of a merchant ship which are available for cargo, stores, fuel, passengers and crew.
• Suez Canal net tonnage:
  • Is a measure of the internal volume of space within a vessel in which 1 ton is equivalent to 2.83 cub m or 100 cub ft.
• Gross Tonnage (GT):
  • Is an INTERNAL VOLUME measurement of a vessel based on the dimensions of the vessel, such as Length, Breadth, and “depth” (not draft).
• Dead weight:
  • Is the amount of metric ton of cargo, stores and fuel the vessel is able to carry.
• Net tonnage (NT):
  • Is based on a calculation of the volume of all cargo spaces of the ship.

• Displacement Tonnage
  • It is the weight of a ship
  • It is calculated from the formula: Displacement mass (m) = Density (p) x Volume (v)
  • The mass of displaced water equal to the mass of the vessel
• Standard Displacement Tonnage
  • It is the ship’s displacement tonnage minus the weight of fuel, and water on board
  • Ship’s displacement tonnage – fuel and water = Ship’s standard displacement tonnage
• Deadweight Tonnage
  • It is the maximum cargo weight that a ship can carry
  • Deadweight tonnage is the total weight of cargo, fuel, suppliers, etc. on board of a ship
• Lightweight Tonnage
  • It is the weight of a ship and its permanent machinery
  • Lightweight tonnage does not include fuel, water, or any supplies on board the ship
• Gross Tonnage (GT)
  • It is the measure of the overall size of a ship
  • Gross tonnage is calculated from the formula: GT = K 1V
  • You will use gross tonnage to register your ship if you are a ship owner
• Net Tonnage (NT)
  • It is the measure of the useful capacity of a ship
  • You also need your ship’s net tonnage for registration, so people also refer to net tonnage (NT) as net register tonnage (NRT)

• Gross Tonnage: applies to vessels, not to cargo. It is determined by dividing by 100 the contents, in cubic feet, of the vessel’s closed-in spaces. A vessel ton is 100 cubic feet.
  • The numerical value for a ship’s Gross Tonnage is always smaller than the numerical values of gross register tonnage (GRT).
  • Net tonnage is based on “the moulded volume of all cargo spaces of the ship” while gross tonnage is based on “the moulded volume of all enclosed spaces of the ship”.
  • To calculate the Gross Tonnage figure, take the volume of a vessel’s enclosed spaces (from keel to funnel) measured to the outside of the hull framing.
• Deadweight Tonnage: expresses the number of tons of 2,240 pounds that a vessel can transport of cargo, stores, and bunker fuel.
  • Deadweight is the actual amount of weight in tonnes that a vessel can carry when loaded to the maximum permissible draught (includes fuel, fresh water, gear supplies, catch and crew).
  • Deadweight is the difference between the displacement and the mass of empty vessel (lightweight) at any given draught. It is a measure of ship’s ability to carry various items: cargo, stores, ballast water, provisions and crew, etc.
  • To calculate the Deadweight tonnage figure, take the weight of a vessel that is not loaded with cargo and subtract that figure from the weight of the vessel loaded to the point where it is immersed to the maximum safe depth.

• Gross Tonnage:
  • Measures the overall internal volume of a vessel.
  • Divided by 100 the contents, in cubic feet, of the vessel’s enclosed spaces.
  • Applies to the vessel, not to cargo.
  • Measures the ship’s volume and has nothing to do with weight.
• Net Tonnage:
  • Gross tonnage minus the space occupied by accommodations for crew, by machinery, for navigation, by the engine room and fuel.
  • Represents the available space for accommodation of passengers and stowage of cargo.
• Deadweight Tonnage:
  • Measures how much weight a ship can carry.
  • Includes the sum of the weights of cargo, fuel, fresh water, ballast water, provisions, passengers, and crew, but does not include the empty weight of the ship.
  • Represents the difference between the number of tons of water a vessel displaces “light” and the number of tons it displaces when submerged to the “load line”.

• Deadweight (DWT)and displacement are expressions of physical weight.
  • DWT is how much the ship can carry, while displacement is how much water the ship has to move out of the way.
  • Tankers and bulk carriers will, more or less, have DWTs roughly two-thirds to double the GT.
  • A container ship will have a DWT in close proximity to its GT, while passenger ships, gas carriers, and car carriers will have quite small DWTs compared to their GT.
• GRT was a calculation of the number of 100 cubic foot ‘boxes’ a ship could accommodate in its enclosed space.
  • NRT reflected the same figure, but just for the money earning spaces.
  • Now the figure is based around cubic metres and is adjusted with a sliding figure to bring it more into line with the tonnages it was replacing.

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What is the difference between Gross Tonnage and Summer DWT of a vessel?