8.5 

8-5
Determination of tonnage
8.5.1 Every surveyor measuring a ship and calculating its gross and net tonnage shall do so in accordance with this paragraph.
8.5.2 The owner and the master of a ship to be measured shall make the ship and all necessary facilities for the inspection and measurement available to the surveyor.
8.5.3 The owner and the master shall produce for the surveyor’s use, and retention if required, such plans, drawings, specifications and other documents relating to the ship that the surveyor may require to enable him or her to calculate the gross and net tonnages of the ship.
8.5.4 Gross tonnage Calculation

The gross tonnage (GT) of a ship shall be determined by the following formula—

GT = K1V

where: V = Total volume of all enclosed spaces of the ship in cubic metres,

K1 = 0.2 + 0.02 log10V

8.5.5 Net tonnage

The net tonnage (NT) of a ship shall be determined by the following formula—

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in which formula

  • (a)the factor [4d]2 shall not be taken as greater than unity; and 3D
  • (b)the term K2Vc(4d)2 shall not be taken as less than 0.25GT; and 3D
  • (c)NT shall not be taken as less than 0.30 GT, and in which:

Vc = total volume of cargo spaces in cubic metres,

K2 = 0.2 + 0.02 log10Vc

K3 = 1.25 GT+ 10,00010,000

D = moulded depth amidships in metres,

d = moulded draught amidships in metres,

N1 = number of passengers in cabins with not more than 8 berths,

N2 = number of other passengers,

N1 + N2 = total number of passengers the ship is permitted to carry as indicated in the ship’s passenger certificate; when N1 + N2 is less than 13, N1 and N2 are to be taken as 0,

GT = gross tonnage of the ship as determined by subparagraph 8.5.4.