what is a class ?
Class defines a technical and safety standards of a ship, which reflects the risk of insuring ship.
Reasons to class a ship –
- Determination of fitness.
- Meet requirement of Jurisdiction.
- Possible lower insurance premiums.
- Indicates due negligence.
- Indicates proper maintenance is performed.
- Owner Satisfaction.
What is Classification Society :-
- A classification society is a non-government organisation that establishes and maintain technical standards for the construction and operation of ships and offshore structures.
- A classification society certifies that the construction of a vessel complies with relevant standards and carry out a regular survey to ensure compliance with standards.
- Currently, more than 50 organisations describe their activities as including marine classification, 12 of which are member of international association of classification society.
- A classification society also issue International load line certificates in accordance with the legislation of participating states giving effect to the international convention to load lines.
Various Classification societies and IACS :-
The International Association of Classification Societie’s (IACS) is a technically based non-governmental organization that currently consists of twelve member marine classification societies. More than 90% of the world’s cargo-carrying ships tonnage is covered by the classification standards set by member societies of IACS.
IACS provides a forum within which the member societies can discuss, research and adopt technical criteria that enhance maritime safety.

https://en.wikipedia.org/wiki/Classification_society