Reg. 1.9
Clasification Society 2024 - Version 9.40
Statutory Documents - IMO Publications and Documents - International Conventions - MARPOL - International Convention for the Prevention of Pollution from Ships - Unified Interpretations of Annex I - 2 Major conversion - Reg. 1.9

Reg. 1.9

  2.1 The deadweight to be used for determining the application of provisions of Annex I is the deadweight assigned to an oil tanker at the time of the assignment of the load lines. If the load lines are reassigned for the purpose of altering the deadweight, without alteration of the structure of the ship, any substantial alteration of the deadweight consequential upon such reassignments should not be construed as a “major conversion” as defined in regulation 1.9. However, the IOPP Certificate should indicate only one deadweight of the ship and be renewed on every reassignment of load lines.

  2.2 If a crude oil tanker of 40,000 tonnes deadweight and above delivered on or before 1 June 1982 as defined in regulation 1.28.3 satisfying the requirements of COW changes its trade for the carriage of product oilfootnote conversion to CBT or SBT and reissuing of the IOPP Certificate will be necessary. Such conversion should not be considered as a "major conversion" as defined in regulation 1.9.

  2.3 When an oil tanker is used solely for the storage of oil and is subsequently put into service in the transport of oil, such a change of function should not be construed as a "major conversion" as defined in regulation 1.9.

  2.4 The conversion of an existing oil tanker to a combination carrier, or the shortening of a tanker by removing a transverse section of cargo tanks, should constitute a “major conversion” as defined in regulation 1.9.

  2.5 The conversion of an existing oil tanker to a segregated ballast tanker by the addition of a transverse section of tanks should constitute a "major conversion" as defined in regulation 1.9 only when the cargo-carrying capacity of the tanker is increased.

  2.6 When a ship built as a combination carrier operates exclusively in the bulk cargo trade, the ship may be treated as a ship other than an oil tanker and Form A of the Record of Construction and Equipment should be issued to the ship. The change of such a ship from the bulk trade to the oil trade should not be construed as a "major conversion" as defined in regulation 1.9.

Parent topic: 2 Major conversion
Copyright 2022 Clasifications Register Group Limited, International Maritime Organization, International Labour Organization or Maritime and Coastguard Agency. All rights reserved. Clasifications Register Group Limited, its affiliates and subsidiaries and their respective officers, employees or agents are, individually and collectively, referred to in this clause as 'Clasifications Register'. Clasifications Register assumes no responsibility and shall not be liable to any person for any loss, damage or expense caused by reliance on the information or advice in this document or howsoever provided, unless that person has signed a contract with the relevant Clasifications Register entity for the provision of this information or advice and in that case any responsibility or liability is exclusively on the terms and conditions set out in that contract.