INTERNATIONAL TONNAGE CONVENTION 1969 : Every Information for written or oral exam with memory trick

Описание: INTERNATIONAL TONNAGE CONVENTION 1969 : Every Information for written or oral exam with memory trick to memorise GT & NT formula

Use of tonnage measurement

Decide on freight charges
To know cargo carrying capacity ( By Shipper or Charterer)
To calculate port dues, Pilot Dues, & Harbour dues.
-To charge Lighthouse dues
For insurance coverage, sum liable and for underwriters
for regulatory authority for deciding on requirements like number of LSA, FFA, Certificates, Records, Documents at sector for competency certificate & rules
And for competency certification of seafarers.

RULES:

Set of rules and guidelines for measuring measuring tonnage.
Contains formula and guidelines to use enclosed spaces spaces.
Spaces which are not used in calculation are excluded spaces
Tonnage measured using tonnage convention is called International tonnage

GROSS TONNAGE

GT is the function of the moulded volume of all enclosed spaces of the ship.
GT is the measurement of overall size of the shape determined in accordance with the provision of tonnage convention.
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

NET TONNAGE

volume of cargo carrying capacity of ship.
NT is produced by the formula which is a function of the molded volume of all cargo cargo function function of the molded volume of all cargo cargo volume of all cargo spaces of the ship
NT shall not be taken as less than 30% of the GT.
NT means the measurement of useful capacity of the ship determined in accordance with the provision of convention.

In the NT formula:

The factor (4d/3d)2 shall not be taken as greater than unity
K2Vc.factor shall not be taken as less than 0.25 gross tonnage
Net tonnage shall not be less than 0.3 Gross tonnage

Vc : total volume of cargo spaces in metre cube

K2 =0.2 + 0.02 log 10 Vc or as tabulated in Appendix 2

K3 =1.25 x (GT + 10000) /10000

d : The ship's moulded draft amidships in meters, and

D : The ship's moulded depth amidships in metres

N1: number of passengers in cabins

N2 : number of other passengers

N1 + N2 : number of passengers ship permitted to carry

IMPORTANT TERMS

Certifying Authority ( Class) : after surveying and measuring spaces calculate GT and N T as per the above formula and then issues and international tonnage certificate.

Cargo Spaces: spaces to be included in computation of NT, spaces appropriate for transport of cargo, spaces Shall be marked with letter cc (cargo compartment) size must be greater than 4 inches.

Enclosed Spaces: spaces which of bounded by ship's hull by fixed or portable partitions or bulkheads by decks or other coverings

Excluded Spaces : spaces not included in the volume of enclosed spaces. These are the spaces used for running the ship example Bridge machinery spaces and steering gear room etc

Weather Tight : spaces where the water shall not penetrate in any sea condition

Information on international tonnage certificate

Front :

Name of the ship, port of registry, official number of The vessel.

Date on which the keel was laid

Length breadth and moulded depth

GT and NT

Date on which ship underwent a major alteration or modification

BEHIND THE CERTIFICATE :

list of all spaces included in GT and NT.

list of excluded spaces

Number of passengers

Moulded draught

Date and place of original measurement

Date and place of remeasurement if any

Builder of The vessel, year built, place built, number of masts etc

This certificate is valid till any alteration is made in form or capacity of the ship or if error is discovered in the initial measurement