How is tonnage measured?
Gross tonnage is calculated from the formula GT = K1V, where V is the volume of a ship’s enclosed spaces in cubic metres and K1 is a constant calculated by K1 = 0.2 + 0.02 log10 V. The measurement is used in assessing harbour dues and canal transit dues for merchant ships.
What is GT and NT?
GT, the magic measurement based on which various dues will be levied and some statutory requirements imposed, is a factor of the internal volume of the permanently enclosed spaces of a ship from keel to funnel, while NT is the measure of the volume capacity of the permanently enclosed spaces of the vessel from keel to …
Does tonnage mean weight?
Non-maritime usage of the term tonnage The term can also apply to the total weight drawn by a railway locomotive, or the total weight of freight passing over a railway line or road. The tonnage may be expressed as 1 tonne (1,000 kg; 2,205 lb), 1 short ton (907.2 kg; 2,000 lb) or 1 long ton (1,016 kg; 2,240 lb).
What is difference between gross tonnage and net tonnage?
Gross tonnage is based on “the moulded volume of all enclosed spaces of the ship” whereas net tonnage is based on “the moulded volume of all cargo spaces of the ship”.
Why gross tonnage has no unit?
It should be noted that the word ‘tons’ is no longer to be applied since the gross and net tonnages are dimensionless, i.e. there are no physical units of tonnage. Hence the tonnage will be expressed as, e.g. the ship has ‘Gross Tonnage of 12,345’ without the addition of any units.
What is GT DWT?
GT is a measure of the total internal capacity of the ship, and represents the total volume in cubic feet divided by 100. DWT is the maximum load volume of a ship. The actual cargo tonnage is DWT minus tonnage for passengers, crew, fuel, ballast, food, and ship supplies.
Is GT and GRT same?
Gross register tonnage or gross tonnage (GT) represents the total internal volume of cargo vessels. Gross register tonnage (GRT) and net register tonnage (NRT) have been replaced by gross tonnage (GT) and net tonnage (NT) which express the size and volume of a ship as a simple dimensionless figure.
Why Gross Tonnage has no unit?
How is the tonnage of a ship calculated?
The Tonnage calculations are used as follows using outlined definitions. Briefly the calculation is as follows: If the length overall is over 24 metres she can still be measured but the measurer must also ensure that the vessel is under both 24 metres Load Line Length and Registered Length as defined below.
Which is the correct way to describe the tonnage?
The tonnage may be expressed in short tons (2,000 lb), metric tons or tonnes (1,000 kg), or in long tons (2,240 lb).
What’s the difference between Gross and net tonnage?
(4) “gross tonnage” means the measure of the overall size of a ship determined in accordance with the provisions of the present Convention; (5) “net tonnage” means the measure of the useful capacity of a ship determined in accordance with the provisions of the present Convention;
When was gross register tonnage replaced by gross tonnage?
Gross register tonnage was replaced by gross tonnage in 1982 under the Tonnage Measurement convention of 1969, with all ships measured in GRT either scrapped or re-measured in GT by 1994.
