Net register tonnage

Source: Wikipedia, the free encyclopedia.

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 subtracting 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 tonnage is thus used in situations where a vessel's earning capacity is important, rather than its mere size. 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

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

  1. , retrieved 2011-10-17
  2. ^ Units and Systems of Measurement Their Origin, Development, and Present Status Archived 2011-10-19 at the Wayback Machine. National Institute of Standards and Technology. Retrieved 2011-10-17.
  3. ^ International Convention on Tonnage Measurement of Ships Archived 2013-12-02 at the Wayback Machine. International Maritime Organization (IMO). Retrieved 2011-10-17.