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 SC122 Rev1 Corr1 CLN
UI SC122 Corrosion Prevention in Seawater Ballast Tanks (Chapter II-1, Regulation 3-2) - Rev.1 Corr.1 Oct 2008
UI SC123 Rev3 CLN
UI SC123 Machinery Installations - Service Tank Arrangements Reg. II-1/26.11 - Rev.3 Dec 2005
UI SC124 Rev1 Corr1 CLN
UI SC124 Emergency Source of Power in Passenger and Cargo Ships Reg. II-1/42.3.4 and II-1/43.3.4 - Rev.1 Corr.1 Oct 2007
UI SC125 Rev2 Corr1 CLN
UI SC126 Rev2 CLN
UI SC126 Fire Protection Materials for Cargo Ships (SOLAS regulations II-2/5.3 and 6.2) Rev.2 Nov 2005
UI SC127 Rev2 CLN
UI SC127 Paints, varnishes and other finishes (Reg. II-2/6.2) - Rev.2 November 2005
UI SC128 Rev2 CLN
UI SC128 CO2 Discharge Time (Reg. II-2/18.104.22.168.1, FSS Code, Ch. 5, 22.214.171.124) - Rev.2 Nov 2005
UI SC129 Rev2 CLN
UI SC129 Fire Detection in Unmanned Machinery Spaces (Reg. II-2/7.4) - Rev.2 Nov 2005
UI SC130 Rev2 CLN
UI SC130 Fire Detection and Sprinkler Systems in Refrigerated Chambers and Similar Spaces (Reg. II-2/7.5.2 and Reg. II-2/10.6.1.1) (Reg. II-2/41-2.5 as contained in MSC24(60), FSS Code, Ch. 8, 2.1.1) - Rev.2 Nov 2005
UI SC131 Deleted
UI SC131 Liquid Cargoes for which regular foam is not effective for Fire Fighting Deleted in Nov 2005 because of SOLAS 2000 Amendments.
UI SC132 Rev4 CLN
UI SC133 New
UI SC133 Oil Mist Detector on High Speed Engines - “equivalent device” (Chapter II-1, Regulation 47.2) - May 1998
UI SC134 New
UI SC134 Essential Services and Arrangements of Sources of Power, Supply, Control and Monitoring to the different Catergories of Essential Services (SOLAS Regulations ll-1/40 & 41) - June 2002
UI SC135 Deleted
UI SC135 Escape Route or Low Location Lighting (LLL) (Chapter II-2, Regulation 28.1.10) Deleted in May 2004
UI SC136 Rev3 CLN
UI SC136 Connecting means by which the main bus bars of the main source of electrical power are normally connected (Chapter II-1, Regulation 126.96.36.199) - Rev.3 Nov 2005
UI SC137 New
UI SC137 Definition of High Speed Craft (Chapter IX, Reg 1.8) - April 1998
UI SC138 New
UI SC138 Safe Access to Tanker Bows Reg. II-1/3-3.2 - May 1998
UI SC139 Deleted
UI SC139 Navigation bridge visibility (Chapter V, Regulation 22) Deleted Dec 2011
UI SC140 Rev3 CLN
UI SC141 Deleted
UI SC141 Information on compliance with requirements for bulk carriers - "triangle" to be marked on a bulk carrier (Chapter XII, Regulation 8.3) Deleted in July 1999.