Net register tonnage

Net register tonnage
See also: Ton#Units of volume

Net register tonnage (NRT, nrt, n.r.t.) is a ship's cargo volume capacity expressed in "register tons", one of which equals to a volume of 100 cubic feet (2.83 m3). It is calculated by reducing non-revenue-earning spaces i.e. spaces not available for carrying cargo, for example engine rooms, fuel tanks and crew quarters, from the ship's gross register tonnage.[1][2] Net register tonnage is not a measure of the weight of the ship or its cargo, and should not be confused with terms such as deadweight tonnage or displacement.

Gross and net register tonnages were replaced by gross tonnage and net tonnage, respectively, when the International Maritime Organization (IMO) adopted The International Convention on Tonnage Measurement of Ships on 23 June 1969. The new tonnage regulations entered into force for all new ships on 18 July 1982, but existing vessels were given a migration period of 12 years to ensure that ships were given reasonable economic safeguards, since port and other dues are charged according to ship's tonnage. Since 18 July 1994 the gross and net tonnages, dimensionless indices calculated from the total moulded volume of the ship and its cargo spaces by mathematical formulae, have been the only official measures of the ship's tonnage.[3] However, the gross and net register tonnages are still widely used in describing older ships.

References

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  1. ^ Stopford, Martin (2009), Maritime Economics, Taylor & Francis, p. 752, http://books.google.fi/books?id=tfsC6RUDn2QC, retrieved 2011-10-17 
  2. ^ Units and Systems of Measurement Their Origin, Development, and Present Status. National Institute of Standards and Technology. Retrieved on 2011-10-17.
  3. ^ International Convention on Tonnage Measurement of Ships. International Maritime Organization (IMO). Retrieved on 2011-10-17.
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Look at other dictionaries:

  • net register tonnage — Gross tonnage less deducted spaces (qv under ↑deduce) • • • Main Entry: ↑tonnage …   Useful english dictionary

  • net register tonnage. — See net tonnage. * * * …   Universalium

  • net register tonnage. — See net tonnage …   Useful english dictionary

  • register tonnage — noun : the gross tonnage of a ship less deductions (as of space occupied by engines and crew) and consisting of the part actually available for commercial use (as in the transport of freight or passengers) * * * Naut. the volume of a vessel, esp …   Useful english dictionary

  • register tonnage — Naut. the volume of a vessel, esp. the net tonnage as measured officially and registered for purposes of taxation. [1855 60] * * * …   Universalium

  • Net tonnage — is calculated by measuring a ship s internal volume and applying mathematical formulae. Net tonnage (often abbreviated as NT, N.T. or nt) is a dimensionless index calculated from the total moulded volume of the ship s cargo spaces by using a… …   Wikipedia

  • net tonnage — net register tonnage See tonnage …   Big dictionary of business and management

  • Tonnage — Not to be confused with Ton. Tonnage is a measure of the size or cargo carrying capacity of a ship. The term derives from the taxation paid on tuns or casks of wine, and was later used in reference to the weight of a ship s cargo; however, in… …   Wikipedia

  • net tonnage — noun : the gross tonnage of a ship less deductions for space occupied by crew s quarters, machinery for navigation, engine room, and fuel * * * the taxable gross tonnage of a merchant ship. Also called net register tonnage. * * * net tonnage, the …   Useful english dictionary

  • tonnage — A measure of the volume or cargo carrying capacity of a ship. The gross register tonnage (GRT) is the volume of a ship below the upper deck measured in shipping tons of 100 cubic feet. The net register tonnage (NRT) is the GRT less the space… …   Big dictionary of business and management

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