ClassNK

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 July to December 2016
• IACS Technical Resolutions adopted from January to June 2016
• IACS Technical Resolutions adopted from July to December 2015
• IACS Technical Resolutions adopted from January to June 2015
• IACS Technical Resolutions adopted from July to December 2014
• IACS Technical Resolutions adopted from January to June 2014
• IACS Technical Resolutions adopted from July to December 2013
• IACS Technical Resolutions adopted from January to June 2013
• IACS Technical Resolutions adopted from July to December 2012

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, Anchoring and Towing	C :	Containers	D :	Mobile Offshore Drilling Units
E :	Electrical Installations	F :	Fire Protection	G :	Gas Tankers
I :	Polar Class	K :	Propellers	L :	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	HSC :	HSC Code	LL :	Load Line
MPC :	MARPOL	PASSUB :	Passenger Submersible Craft
SC :	SOLAS	TM :	Tonnage Measurement

IACS Unified Requirement

Resolution	Revision	Adoption Date	Title	Implementation Date
UR Z18	Rev.7	Jun. 2017	Survey of Machinery	1 Jul. 2018
UR M25	Rev.4	Jun. 2017	Astern power for main propulsion	1 Jul. 2018
UR L5	Rev.3	Jun. 2017	Computer Software for Onboard Stability Calculations	1 Jul. 2018
UR M53	Rev.3	Jun. 2017	Calculations for I.C. Engine Crankshafts	1 Jul. 2018
UR A3	New	Jun. 2017	Anchor Windlass Design and Testing	1 Jul. 2018
UR W11	Rev.9	May 2017	Normal and higher strength hull structural steels	1 Jul. 2018
UR S4	Rev.4	Apr. 2017	Criteria for the Use of High Tensile Steel with Minimum Yield Stress of 315 N/mm2, 355 N/mm2 and 390 N/mm2	---
UR A2	Corr.2	Mar. 2017	Shipboard fittings and supporting hull structures associated with towing and mooring on conventional ships	1 Jul. 2018
UR A1	Corr.2	Mar. 2017	Anchoring Equipment	1 Jul. 2018
UR Z25	New	Jan. 2017	Periodic Survey of Fuel Installations on Ships other than Liquefied Gas Carriers utilizing gas or other low flash point fuels	1 Jan. 2018
UR Z23	Rev.6	Nov. 2016	Hull Survey for New Construction	1 Jan. 2018
UR Z17	Rev.12	Nov. 2016	Procedural Requirements for Service Suppliers	1 Jan. 2018
UR Z10.5	Rev.16	Nov. 2016	Hull Surveys of Double Skin Bulk Carriers	1 Jan. 2018
UR Z10.4	Rev.14	Nov. 2016	Hull Surveys of Double Hull Oil Tankers	1 Jan. 2018
UR Z10.2	Rev.33	Nov. 2016	Hull Surveys of Bulk Carriers	1 Jan. 2018
UR M44	Corr.2	Nov. 2016	Documents for the approval of diesel engines	---
UR A2	Corr.1	Oct. 2016	Shipboard fittings and supporting hull structures associated with towing and mooring on conventional ships	1 Jan. 2018
UR A1	Corr.1	Oct. 2016	Anchoring Equipment	1 Jan. 2018
UR Z15	Corr.1	Oct. 2016	Hull, Structure, Equipment and Machinery Surveys of Mobile Offshore Drilling Units	---
UR W32	New	Sep. 2016	Qualification scheme for welders of hull structural steels	1 Jan. 2018
UR S14	Rev.6	Sep. 2016	Testing Procedures of Watertight Compartments	1 Jan. 2018
UR M77	New	Sep. 2016	Storage and use of SCR reductants	1 Jan. 2018
UR W1	Rev.3	Aug. 2016	Material and welding for gas tankers	1 Jan. 2017
UR I2	Rev.3	Apr. 2016	Structural Requirements for Polar Class Ships	1 Jul. 2017
UR I1	Rev.2	Apr. 2016	Polar Class Descriptions and Application	1 Jul. 2017
UR E25	New	Jun. 2016	Failure detection and response of all types of steering control systems	1 Jul. 2017
UR Z7	Rev.25	Jun. 2016	Hull Classification Surveys	1 Jul. 2017
UR G1	Rev.3	Jun. 2016	Cargo containment of gas tankers	1 Jul. 2016
UR E22	Rev.2	Jun. 2016	On Board Use and Application of Computer based systems	1 Jul. 2017
UR Z7.1	Rev.12	Jun. 2016	Hull Surveys for General Dry Cargo Ships	1 Jul. 2017
UR M73	Corr.1	Jun. 2016	Turbochargers	---
UR M71	Corr.1	Jun. 2016	Type Testing of I.C. Engines	---
UR M44	Corr.1	Jun. 2016	Documents for the approval of diesel engines	---
UR E24	New	Jun. 2016	Harmonic Distortion for Ship Electrical Distribution System including Harmonic Filters	1 Jul. 2017
UR W22	Rev.6	Jun. 2016	Offshore Mooring Chain	1 Jul. 2017
UR M76	New	Apr. 2016	Location of fuel tanks in cargo area on oil and chemical tankers	1 Jul. 2017
UR M74	Rev.1	May 2016	Installation of Ballast Water Management Systems	1 Jan. 2017
UR E7	Rev.4	Apr. 2016	Cables	1 Jul. 2017
UR Z1	Rev.6	Apr. 2016	Annual and intermediate classification survey coverage of IMO Resolution A.1104(29)	---
UR P2.12	Rev.2	Mar. 2016	Flexible Hoses	1 Jan. 2017
UR P2.11	Rev.4	Mar. 2016	Type Approval of Mechanical Joints	1 Jan. 2017
UR P2.7.4	Rev.8	Mar. 2016	Mechanical joints	1 Jan. 2017
UR W16	Rev.3	Mar. 2016	High Strength Steels for Welded Structures	1 Jul. 2017
UR M72	Rev.1	Mar. 2016	Certification of Engine Components	1 Jul. 2017
UR M36	Rev.5	Mar. 2016	Alarms and safeguards for auxiliary reciprocating internal combustion engines driving generators in unattended machinery spaces	1 Jul. 2017
UR M35	Rev.7	Mar. 2016	Alarms, remote indications and safeguards for main reciprocating I.C. engines installed in unattended machinery spaces	1 Jul. 2017
UR Z7	Rev.24	Feb. 2016	Hull Classification Surveys	1 Jul. 2017
UR M75	New	Feb. 2016	Ventilation of emergency generator rooms	1 Jan. 2017
UR G3	Rev.6	Jan. 2016	Liquefied gas cargo and process piping	1 Jan. 2017
UR P3	Rev.4	Jan. 2016	Air Pipe Closing Devices	1 Jan. 2017
UR W17	Rev.4	Jan. 2016	Approval of consumables for welding normal and higher strength hull structural steels	1 Jul. 2017

 

IACS Unified Interpretation

Resolution	Revision	Adoption Date	Title	Implementation Date
UI GC19	New	Aug. 2017	External surface area of the tank for determining sizing of pressure relief valve (paragraph 8.4.1.2 and figure 8.1)	1 Jan. 2018
UI GF1	Rev.1	Jul. 2017	Test for gas fuel tank’s high level alarm	1 Jul. 2018
UI GC18	Rev.1	Jul. 2017	Test for cargo tank’s high level alarm (on ships built on or after 1 July 2016)	1 Jul. 2018
UI SC220	Corr.2	Mar. 2017	Special requirements for ro-ro passenger ships	---
UI SC281	Withdrawn	Jun. 2017	Single fall and hook system used for launching a lifeboat or rescue boat - Interpretation of the LSA Code as amended by MSC.320(89) and MSC.81(70) as amended by MSC.321(89)	---
UI MPC51	Rev.1	Jan. 2017	Resolution 2 of the 1997 MARPOL Conference Technical Code on Control of Emission of Nitrogen Oxides from Marine Diesel Engines	1 Jul. 2018
UI SC191	Corr.3	---	IACS Unified Interpretations (UI) SC 191 for the application of amended SOLAS regulation II-1/3-6 (resolution MSC.151(78)) and revised Technical provisions for means of access for inspections (resolution MSC.158(78))	---
UI SC269	Rev.1	Dec. 2016	Means of escape from the steering gear space in cargo ships	1 Jan. 2018
UI SC191	Corr.2	---	IACS Unified Interpretations (UI) SC 191 for the application of amended SOLAS regulation II-1/3-6 (resolution MSC.151(78)) and revised Technical provisions for means of access for inspections (resolution MSC.158(78))	---
UI SC282	New	Dec. 2016	Application of materials other than steel on engine, turbine and gearbox installations	1 Jul. 2017
UI SC227	Rev.2	Nov. 2016	The dedicated seawater ballast tanks in SOLAS Chapter II-1 (Regulation 3-2)	1 Jul. 2017
UI SC213	Rev.4	Nov. 2016	Arrangements for remotely located survival craft	1 Jan. 2017
UI SC257	Rev.1	Oct. 2016	Pilot Transfer Arrangements (SOLAS V/23 as amended by Resolution MSC.308 (88))	1 Jul. 2013
UI SC220	Corr.1	Sep. 2016	Special requirements for vehicle ferries, ro-ro ships and other ships of similar type	---
UI SC267	Rev.2	Sep. 2016	Implementation of the requirements relating to lifeboat release and retrieval systems (LSA Code Paragraph 4.4.7.6 as amended by resolution MSC.320(89))	1 Jan. 2017
UI SC275	Rev.1	Sep. 2016	Suitable number of spare air cylinders to be provided in connection with drills	1 Jan. 2017
UI MODU2	New	Aug. 2016	Inclusion of the weight of mediums of the fire-fighting systems in lightweight (2009 MODU Code Chapter 1, paragraph 1.3.30)	1 Jan. 2017
UI SC272	Rev.1	Jul. 2016	Inert gas supply to double-hull spaces (SOLAS II-2/4.5.5.1)	1 Jan. 2017
UI MPC93	Rev.1	Apr. 2016	Annex I of MARPOL 73/78 Regulation 23 Accidental oil outflow performance, as amended by Resolution MEPC.117(52)	1 Jul. 2017
UI SC94	Rev.2	Jun. 2016	Mechanical, hydraulic and electrical independency of steering gear control systems	1 Jul. 2017
UI GC8	Rev.1	Jun. 2016	Permissible stresses in way of supports of type C cargo tanks	1 Jul. 2016
UI HSC10	New	May 2016	Inclusion of mediums of the fire-fighting systems in lightweight (2000 HSC Code Chapter 1, Regulation 1.4.34)	1 Jan. 2017
UI MPC128	New	May 2016	Inclusion of mediums of the fire-fighting systems in lightweight (MARPOL Annex I/Regulation 1.24)	1 Jan. 2017
UI GC7	Rev.1	Jun. 2016	Carriage of products not covered by the code	1 Jul. 2016
UI SC273	Rev.1	May 2016	Inclusion of mediums of the fire-fighting systems in lightweight (SOLAS II-1/2.21, SOLAS II-2/3.28) and lightship condition (IS Code 2008 Paragraph 2.23)	1 Jan. 2017
UI SC234, LL76 and MPC96	del	Jun. 2016	Initial Statutory Surveys at New Construction	---
UI SC279	new	Jun. 2016	Annual testing of VDR, S-VDR, AIS and EPIRB - SOLAS regulation V/18.8 – Annual performance test of Voyage Data Recorder (VDR) and Simplified Voyage Data Recorder (S-VDR); - SOLAS regulation V/18.9 – Annual performance test of Automatic Identification System (AIS); - SOLAS regulation IV/15.9 – Annual performance test of EPIRB.	1 Jul. 2017
UI SC191	Corr.1	Jun. 2016	IACS Unified Interpretations (UI) SC 191 for the application of amended SOLAS regulation II-1/3-6 (resolution MSC.151(78)) and revised Technical provisions for means of access for inspections (resolution MSC.158(78))	---
UI MODU1	Corr.1	Jun. 2016	IACS Unified Interpretations for the application of MODU Code Chapter 2 paragraphs 2.1, 2.2, 2.3, 2.4 and revised Technical provisions for means of access for inspections (Resolution MSC.158(78))	---
UI MPC11	Rev.2	Jun. 2016	Interpretation to MARPOL I/27	1 Jan. 2017
UI CC7	New	Jun. 2016	Unprotected openings	1 Jan. 2017
UI GC17	New	Jun. 2016	Unprotected openings	1 Jan. 2017
UI LL80	New	Jun. 2016	Unprotected openings	1 Jan. 2017
UI MPC129	New	Jun. 2016	Unprotected openings	1 Jan. 2017
UI SC280	New	Jun. 2016	Angle of down-flooding (ϕf) / Angle at which an opening incapable of being closed weathertight (θv)	1 Jan. 2017
UI SC253	Rev.1	May 2016	Fire resistance requirements for fibre-reinforced plastic (FRP) gratings used for safe access to tanker bows (IMO Res. MSC.62(67))	1 Jan. 2017
UI MPC124	Withdrawn	May 2016	2011 Guidelines Addressing Additional Aspects to the NOx Technical Code 2008 with regard to Particular Requirements related to Marine Diesel Engines fitted with Selective Catalytic Reduction (SCR) Systems (Resolution MEPC.198(62), Section 7.5)	---
UI MPC121	Withdrawn	May 2016	2011 Guidelines Addressing Additional Aspects to the NOx Technical Code 2008 with regard to Particular Requirements related to Marine Diesel Engines fitted with Selective Catalytic Reduction (SCR) Systems (Resolution MEPC.198(62), Section 6.3.1.1)	---
UI MPC119	Withdrawn	May 2016	2011 Guidelines Addressing Additional Aspects to the NOx Technical Code 2008 with regard to Particular Requirements related to Marine Diesel Engines fitted with Selective Catalytic Reduction (SCR) Systems (Resolution MEPC.198(62), Section 5.1.1)	---
UI MPC107	Withdrawn	May 2016	2011 Guidelines Addressing Additional Aspects to the NOx Technical Code 2008 with regard to Particular Requirements related to Marine Diesel Engines fitted with Selective Catalytic Reduction (SCR) Systems (Resolution MEPC.198(62), Section 3.1.1)	---
UI TM3	Withdrawn	Apr. 2016	Interpretation of International Tonnage Calculation: Open Deck Spaces Bounded by Partitions or Bulkheads (ITC69 regulation 2(4), 2(5) and 6)	---
UI SC242	Rev.1	Apr. 2016	Arrangements for steering capability and function on ships fitted with propulsion and steering systems other than traditional arrangements for a ship’s directional control	1 Jul. 2017
UI GC16	New	Mar. 2016	Cargo tank clearances (on ships constructed on or after 1 July 2016)	1 Jul. 2016
UI GC6	Rev.1	Feb. 2016	Cargo tank clearances	1 Jul. 2016
UI GC5	Rev.1	Feb. 2016	Closing Devices for Air Intankes	1 Jul. 2016
UI GC15	New	Feb. 2016	Closing Devices for Air Intakes	1 Jul. 2016
UI GC13	Rev.1	Mar. 2016	Examination before and after the first loaded voyage	1 Jul. 2016
UI GC11	Rev.1	Feb. 2016	Loading of cargo C tanks for ships constructed before 1 July 2016 and subject to IMO International Code for the Construction and Equipment of Ships Carrying Liquefied Gases in Bulk (MSC.5(48))	1 Jul. 2016
UI MPC127	New	Feb. 2016	Annex I of MARPOL 73/78 Regulation 14.7	1 Jan. 2017
UI SC278	New	Jan. 2016	Escape from accommodation spaces, service spaces and control stations on cargo ships	1 Feb. 2016
UI SC277	New	Jan. 2016	Escape from machinery spaces on cargo ships	1 Feb. 2016
UI SC276	New	Jan. 2016	Escape from machinery spaces on passenger ships	1 Feb. 2016
UI SC267	Rev.1	Jan. 2016	Implementation of the requirements relating to lifeboat release and retrieval systems (LSA Code Paragraph 4.4.7.6 as amended by resolution MSC.320(89))	1 Jul. 2016
UI SC275	New	Jan. 2016	Suitable number of spare air cylinders to be provided in connection with drills	1 Jan. 2017