IACS Unified Requirement and Unified Interpretation
This page provides the text of newly established IACS Unified Requirements (UR) and Unified Interpretations (UI) as well as their most recent revisions and corrigenda. Recent revisions and changes have been underlined for easy reference.
Texts of the IACS Unified Requirements and Unified Interpretations are made available on this page for the period of one year following the date of adoption. Texts of all current UR/UI can be found on the IACS website (http://www.iacs.org.uk).
IACS Unified Requirements
IACS Unified Requirements are the minimum class requirements shared among all IACS Member Societies. Unless an application date is specified, Unified Requirements are to be incorporated in the Rules and practices of each IACS Member Society within one year of their adoption by IACS.
IACS Unified Interpretations
IACS Unified Interpretations were created with a view to the uniform implementation of IMO conventions among all IACS Member Societies and provide interpretations of IMO Conventions which are vaguely worded or have been left to the satisfaction of each Administration.
The outlines of technical resolutions adopted by IACS are available at the links shown below.
- IACS Technical Resolutions adopted from January to December 2025
- IACS Technical Resolutions adopted from January to December 2024
- IACS Technical Resolutions adopted from January to December 2023
- IACS Technical Resolutions adopted from January to December 2022
- IACS Technical Resolutions adopted from January to December 2021
- IACS Technical Resolutions adopted from January to December 2020
- IACS Technical Resolutions adopted from January to December 2019
- IACS Technical Resolutions adopted from January to December 2018
- IACS Technical Resolutions adopted from January to December 2017
- IACS Technical Resolutions adopted from January to December 2016
Implementation Dates
The Implementation dates of the Unified Requirements (UR) and Unified Interpretations (UI) are shown in the "Implementation Date" column of the tables. However, as each UR / UI has its own implementation scheme, e.g. contract basis, keel laying basis, etc. please confirm the implementation dates included in the texts.
Unified Requirements and Unified Interpretations will be incorporated into the ClassNK Rules / Guidance and apply to ships classed with ClassNK.
UR Abbreviations
| A : | Mooring and Anchoring | C : | Containers | D : | Mobile Offshore Drilling Units |
| E : | Electrical and Electronic Installations | F : | Fire Protection | G : | Gas Tankers |
| I : | Polar Class | K : | Propellers | L : | Subdivision, Stability and Load Line |
| M : | Machinery Installations | N : | Navigation | P : | Pipes and Pressure Vessels |
| S : | Strength of Ships | W : | Materials and Welding | Z : | Survey and Certification |
UI Abbreviations
| CC : | IBC Code / BCH Code | COLREG : | COLREG | FTP : | FTP Code | ||
| GC : | IGC Code / GC Code | GF : | IGF Code | HSC : | HSC Code | ||
| LL : | Load Line | MODU : | MODU Code | MPC : | MARPOL | ||
| PASSUB : | Passenger Submersible Craft | SC : | SOLAS | TM : | Tonnage Measurement |