Ship Tonnages Explained: Deadweight, Gross, Net & More
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Tonnage is a measure of the size or cargo carrying capacity of a ship. Various types of tonnages are there as per the tonnage convention.
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Ship Tonnages Explained: Deadweight, Gross, Net & More
- 1. Elements of Shipping Management - Ship’s Tonnages - Ajith V A MBA ITLM IMU Cochin
- 2. TONNAGE ▸Tonnage is a measure of the size or cargo carrying capacity of a ship. ▸A commonly defined measurement system is important; since a ship’s registration fee, harbour dues, safety and manning rules etc., are based on its gross tonnage (GT) or net tonnage (NT). ▸The Tonnage Convention 1994 (1969) was adopted at a conference held under the auspices of the IMO to introduce a universally recognized system for measuring the tonnage of ships. ▸“Tonnage” specifically refers to a calculation of the volume or cargo volume of a ship. ▸Tonnage should not be confused with Displacement which refers to the loaded or empty weight of the vessel itself. 2
- 3. Tonnage measurements : There are five kinds of tonnage in use in the shipping business. They are: ▸ Deadweight ▸ Cargo, ▸ Gross, ▸ Net and ▸ Displacement Tonnages 3
- 4. Lightweight tonnage 4 ▸ Lightweight tonnage is best described as the weight of the ship when it was built in the shipyard including all framing, machinery, decking etc. ▸It does not include the weight of any consumables such as fuel, water, oil or supplies.
- 5. Deadweight tonnage ▸It is a measure of how much weight a ship can safely carry. ▸It is the sum of the weight of cargo, fuel, fresh water, ballast water, provisions, passengers and crew. 5
- 6. Cargo tonnage 6 ▸It is the goods or produce transported for commercial gain by the ship. ▸Cargo tonnage is expressed in terms of a weight or measurement.
- 7. Gross registered tonnage 7 ▸Gross tonnage applies to vessels, not to cargo. ▸Gross tonnage (GT) is a function of the volume of ship's all enclosed spaces (from keel to funnel) measured to the outside of the hull framing.
- 8. Net registered tonnage 8 ▸Net tonnage (NT) is based on a calculation of the volume of all cargo spaces of the ship. ▸It indicates a vessel’s earning space and is a function of the molded volume of all cargo spaces of the ship.
- 9. Displacement tonnage 9 ▸The displacement tonnage of a ship is the ship's weight. ▸The name reflects the fact that it is measured indirectly, by first calculating the volume of water displaced by the ship, and then calculating the weight of that water.
- 10. Standard Displacement tonnage 10 ▸Standard displacement tonnage is basically same as displacement tonnage with one minor difference. ▸When calculating standard displacement tonnage, you subtract the weight of any fuel and potable water carried on board the ship.
- 11. 11 THANK YOU !