Tonnage measurement of ships

Tonnage measurement is determining the ship tonnage including making/reviewing calculations of ship tonnage and issuing tonnage certificates. 

Reviewing and making of tonnage calculations

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:

• lines drawing;
• hydrostatic curves;
• 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).

Issued documents:

• 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.

Issuance of tonnage certificates

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.

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.

Issued documents:

• ITC69;
• 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.

• Ask a question

Ask a question

Your Name*
Company name
Your E-mail address*
Your Question
Protection from automated form filling

* - required fields