Tonnage certificate The tonnage of ships forms the basis for manning regulations, safety rules, registration fees, calculation of port dues, etc. The certificate has no expiry date, but will have to be amended in case of any conversion to the vessel. In a ship measurement system devised by George Moorsom, based on the idea that size would be best indicated by the volume of a ship and that charging of service fees should be based on the earning ability of a ship, was adopted and became law in Britain.
For volume, the system used the enclosed volume of a ship, measured in cubic feet. Gross Tonnage : applies to vessels, not to cargo. It is determined by dividing by the contents, in cubic feet, of the vessel's closed-in spaces.
A vessel ton is cubic feet. The register of a vessel states both gross and net tonnage. Net Tonnage : is a vessel's gross tonnage minus deductions of space occupied by accommodations for crew, by machinery, for navigation, by the engine room and fuel. A vessel's net tonnage expresses the space available for the accommodation of passengers and the stowage of cargo.
Only in the case of heavy loads put at the bottom of the hold , greater deadweight translates automatically into greater amount of cargo.
Frequently, a large part of the deadweight is used for water ballast necessary to meet stability requirements. The guaranteed deadweight of vessel at scantling draught of Delivered at Terminal DAT. Drayage Charge. Duty Drawback. More from Cogoport.
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