Unified Interpretations are adopted resolutions on matters arising from implementing the requirements of IMO Conventions or Recommendations. Such adopted resolutions can involve uniform interpretations of Convention Regulations or IMO Resolutions on those matters which in the Convention are left to the satisfaction of the Administration or vaguely worded.
Interpretations are circulated to Administrations concerned or are sent to IMO for information, as appropriate.
- IACS, as an international Non-Governmental Organization having observer status at IMO, works in co-operation with IMO in order to endeavour that regulations developed at IMO are clear, unambiguous and can easily be applied without the need of interpretations.
- However, interpretations may still be needed in cases where IMO regulations contain only functional requirements, allow alternative solutions to prescriptive requirements, are left to the satisfaction of Administrations or are generally or vaguely worded.
- The following Unified Interpretations (UIs) have been developed by IACS to assist the unified implementation of IMO regulations falling in the above-mentioned cases. It should be noted that the development of IACS Unified Interpretations (UIs) is not aiming at introducing additional requirements but at achieving uniform application of IMO regulations.
- IACS UIs are to be applied by IACS Societies to ships whose flag Administrations have not issued definite instructions on the interpretation of the IMO regulations concerned, in the course of statutory certification on behalf of those flag Administrations.
The technical backgrounds (development histories) of Unified Interpretations since 2004 can be found by following this link.
A list of the IACS working groups responsible for each Unified Interpretation may be found here.
UI SC251 New
UI SC251 Controls of emergency bilge suction valve in periodically unattended machinery spaces (SOLAS regulations II-1/48.3) - October 2011
UI SC252 New
UI SC252 Controls for releasing carbon dioxide and activating the alarm in the protected space (FSS Code 188.8.131.52) - October 2011
UI SC253 Rev1 CLN
UI SC254 New
UI SC254 Fall Preventer Devices (MSC.1/Circ.1392 and Circ.1327) - April 2012
UI SC255 Corr1 CLN
UI SC256 New
UI SC256 Date of Delivery under SOLAS and MARPOL Conventions - June 2012
UI SC257 Rev1 CLN
UI SC258 New
UI SC258 For Application of Regulation 3-11, Part A-1, Chapter II-1 of the SOLAS Convention (Corrosion Protection of Cargo Oil Tanks of Crude Oil Tankers), adopted by Resolution MSC.289 (87) The Performance Standard for Alternative Means of Corrosion Protection for Cargo Oil Tanks of Crude Oil Tankers - January 2013
UI SC259 Rev1 Corr1 CLN
UI SC260 Rev1 CLN
UI SC261 New
UI SC261 Interpretation of Performance Standards for voyage data recorders (VDRs) (resolution MSC.333(90)) - May 2013
UI SC262 Rev1 CLN
UI SC263 Deleted
UI SC263 Gaskets in fixed gas fire-extinguishing systems (SOLAS II-2/10.4, IMO FSS Code Ch 5) Deleted June 2014.
UI SC264 New
UI SC264 Non-combustible material as 'steel or equivalent' for ventilation ducts (SOLAS II-2, Reg. 184.108.40.206) - December 2013
UI SC265 New
UI SC265 Code of safe practice for cargo stowage and securing – Annex 14 - December 2013
UI SC266 New
UI SC266 Revised guidelines for cargo securing manual and code of safe practice for cargo stowage and securing - scope of application - December 2013
UI SC267 Rev2 CLN
UI SC268 New
UI SC268 Arrangements for fixed hydrocarbon gas detection systems in double-hull and doublebottom spaces of oil tankers SOLAS Chapter II-2, Regulation 220.127.116.11.1 - March 2014
UI SC269 New