“Major conversion” means a conversion of a ship:
1. which changes its ballast water carrying capacity by 15 percent or greater, or
2. which changes the ship type, or
3. which, in the opinion of the Administration, is projected to prolong its life by ten years or more, or
4. which results in modifications to its ballast water system other than component replacement-in-kind. Conversion of a ship to meet the provisions of regulation D-1 shall not be deemed to constitute a major conversion for the purpose of this Annex.
Source: International Convention for the Control and Management of Ships’ Ballast Water and Sediments, 2004, Legislation