Tonnage measurement is determining the ship tonnage including making/reviewing calculations of ship tonnage and issuing tonnage certificates.
The Register reviews/makes calculations of ship tonnage in accordance with the following Rules of Admeasurement:
International Convention on Tonnage Measurement of Ships, 1969 (IC-69) and the Rules for the Tonnage Measurement of Sea-Going Ships (including the calculation of tonnage of isolated ballast tanks for oil tankers and the calculation of tonnage for a ship less than 24 m long),
Suez Canal Rules
Panama Canal Rules
The service is performed at the customer’s request and based on the ship technical documentation sent to RS in electronic form. To determine the ship tonnage, the following technical documentation is usually required:
general layout drawings
diagrams of compartments and tanks
structural drawings (midship frame, sectional profile, superstructures)
preliminary calculations of ship tonnage (if any)
location of equipment in engine room (for the Suez Canal).
Tonnage calculation according to IC-69 or the Rules for the Tonnage Measurement of Sea-Going Ships
Tonnage calculation according to the Suez Canal Rules
Tonnage calculation according to the Panama Canal Rules
International Tonnage Certificates (ITC69) are only issued by the RS Branch Offices at the request of shipowners/operators if there are relevant authorizations from the Maritime Administrations in place (based on tonnage calculations according to IC-69/Rules for the Tonnage Measurement of Sea-Going Ships).
When replacing a ship's tonnage certificate (except for a ship flying the flag of Malta) due to a change in its name, flag and port of registration, call sign, a new certificate may be issued by the Registry Branch Offices on the basis of the previous tonnage certificate.
For the ships flying the flag of Malta, ITC69 is issued by the Hull Department of the Register Head Office (RHO) or by the Register Branch Offices (on behalf of RHO) at the request of shipowners/operators if there is a relevant individual authorization by the Malta Administration. To have ITC69 issued for a ship flying the flag of Malta, the shipowner/operator shall send a request to the Malta Administration to authorize RS to perform this service. In the case of the replacement of valid ITC69 for a ship flying the flag of Malta when the ship name has been changed (in the absence of changes to other ship data contained in ITC69), no new authorization by the Malta Administration is required.
Tonnage certificates issued on behalf of Administrations are executed according to their requirements.
The Suez Canal tonnage certificate is issued by the Register based on the tonnage calculation according to the Suez Canal Rules
The PC/UMS Documentation of Total Volume is issued based on the tonnage calculation data according to the Panama Canal Rules.
Tonnage certificate for a ship that is not subject to the IC-69 provisions
Tonnage certificate according to the Suez Canal Rules
PC/UMS Documentation of Total Volume