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.

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 Z3 Rev.8 Apr. 2019 Periodical Survey of the Outside of the Ship’s Bottom and Related Items 1 Jul. 2020
UR Z17 Rev.14 Mar. 2019 Procedural Requirements for Service Suppliers 1 Jan. 2020
UR S30 Corr.1 Mar. 2019 Cargo Hatch Cover Securing Arrangements for Bulk Carriers not Built in accordance with UR S21 (Rev.3) ---
UR S21A Corr.2 Mar. 2019 Evaluation of Scantlings of Hatch Covers and Hatch Coamings and Closing Arrangements of Cargo Holds of Ships ---
UR S18 Rev.10 Mar. 2019 Evaluation of Scantlings of Corrugated Transverse Watertight Bulkheads in Non-CSR Bulk Carriers Considering Hold Flooding 1 Jul. 2020
UR S17 Rev.10 Mar. 2019 Longitudinal Strength of Hull Girder in Flooded Condition for Non-CSR Bulk Carriers 1 Jul. 2020
UR M72 Rev.2 Jan. 2019 Certification of Engine Components 1 Jan. 2019
UR D10 Del. Dec. 2018 Electrical installations ---
UR M52 Rev.1 Jan. 2019 Length of aft stern bush bearing 1 Jan. 2020
UR P4 Rev.5 Dec. 2018 Production and Application of Plastic Piping Systems on Ships 1 Jan. 2020
UR M46 Rev.2 Dec. 2018 Ambient conditions - Inclinations 1 Jan. 2020
UR D3 Rev.6 Nov. 2018 General design parametersc 1 Jan. 2020
UR P2 --- Oct. 2018 P2.7.4 Mechanical joints / P2.13 Installation Jan. 2020
UR E10 Rev. 7 Oct. 2018 Test Specification for Type Approval 1 Jan. 2020
UR M79 New Oct. 2018 Towing winch emergency release systems 1 Jan. 2020
UR M3 Rev. 6 Nov. 2018 Speed governor and overspeed protective device 1 Jan. 2020
UR Z7 Rev.27 Oct. 2018 Hull Classification Surveys 1 Jan. 2020
UR M51 Corr.1 Oct. 2018 Factory Acceptance Test and Shipboard Trials of I.C. Engines ---
UR Z10.2 Rev.35 Corr.1 Sep. 2018 Hull Surveys of Bulk Carriers ---
UR Z10.2 Rev.34 Corr.1 Sep. 2018 Hull Surveys of Bulk Carriers ---
UR Z10.2 Rev.33 Corr.1 Sep. 2018 Hull Surveys of Bulk Carriers ---
UR Z20 New Jul. 2018 Planned Maintenance Scheme (PMS) for Machinery 1 Jul. 2019
UR Z18 Rev. 8 Jul. 2018 Survey of Machinery 1 Jul. 2019
UR Z27 New Jul. 2018 Condition Monitoring and Condition Based Maintenance 1 Jan. 2020
UR S6 Rev.9 Jul. 2018 Use of Steel Grades for Various Hull Members - Ships of 90 m in Length and Above 1 Jul. 2019
UR E13 Corr. 1 Jun. 2018 Test requirements for Rotating Machines ---
UR E11 Corr. 1 Jun. 2018 Unified requirements for systems with voltages above 1 kV up to 15 kV ---
UR M76 Rev. 1 Jun. 2018 Location of fuel tanks in cargo area on oil and chemical tankers 1 Jul. 2019
UR Z15 Rev. 2 Jun. 2018 Hull, Structure, Equipment and Machinery Surveys of Mobile Offshore Drilling Units 1 Jul. 2019
UR W13 Rev. 6 Jun. 2018 Thickness tolerances of steel plates and wide flats 1 Jul. 2019
UR G1 Corr.1 May 2018 Cargo containment of gas tankers ---
UR S10 Rev.5 May 2018 Rudders, sole pieces and rudder horns 1 Jul. 2019
UR W17 Rev.5 Mar. 2018 Approval of consumables for welding normal and higher strength hull structural steels 1 Jul. 2019
UR W23 Rev.2 Apr. 2018 Approval of Welding Consumables for High Strength Steels for Welded Structures 1 Jul. 2019
UR S21A Corr.1 Feb. 2018 Evaluation of Scantlings of Hatch Covers and Hatch Coamings and Closing Arrangements of Cargo Holds of Ships ---
UR Z10.5 Rev.18 Jan. 2018 Hull Surveys of Double Skin Bulk Carriers 1 Jan. 2019
UR Z10.4 Rev.15 Jan. 2018 Hull Surveys of Double Hull Oil Tankers 1 Jan. 2019
UR Z10.3 Rev.18 Jan. 2018 Hull Surveys of Chemical Tanker 1 Jan. 2019
UR Z10.2 Rev.35 Jan. 2018 Hull Surveys of Bulk Carriers 1 Jan. 2019
UR Z10.1 Rev.23 Jan. 2018 Hull Surveys of Oil Tankers 1 Jan. 2019
UR Z17 Rev.13 Jan. 2018 Procedural Requirements for Service Suppliers 1 Jan. 2019
UR Z7.2 Rev.7 Jan. 2018 Hull Surveys for Liquefied Gas Carriers 1 Jan. 2019
UR Z7.1 Rev.14 Jan. 2018 Hull Surveys for General Dry Cargo Ships 1 Jan. 2019
UR Z7 Rev.26 Jan. 2018 Hull Classification Surveys 1 Jan. 2019
UR Z3 Rev.7 Jan. 2018 Periodical Survey of the Outside of the Ship’s Bottom and Related Items 1 Jan. 2019

 

IACS Unified Interpretation

Resolution Revision Adoption Date Title Implementation Date
UI SC191 Rev.8 Apr. 2019 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)) 1 Jul. 2019
UI SC190 Rev.1 Apr. 2019 Application of SOLAS Regulation II-1/3-6 (Res MSC.134(76)) and Technical Provisions on Permanent Means of Access (Res MSC.133(76)) 1 Jul. 2019
UI GC24 Rev.1 Feb. 2019 Fire Test for Emergency Shutdown Valves 1 Jan. 2020
UI GF18 New Feb. 2019 Level indicator in the bilge well of tank connection spaces of independent liquefied gas storage tanks 1 Jan. 2020
UI SC6 Rev.1 Feb. 2019 Emergency source of electrical power on Gas Carriers and Chemical Tankers ---
UI MPC127 Del. Aug. 2018 Annex I of MARPOL 73/78 Regulation 14.7 ---
UI MPC102 Del. Aug. 2018 Surveys and certification relating to the Ship Energy Efficiency Management Plan (SEEMP) (MARPOL Annex VI Regulation 5.4.4) ---
UI MPC92 Del. Aug. 2018 Tonnage to be used when applying MARPOL Annex VI ---
UI MPC88 Del. Aug. 2018 Annex IV of MARPOL 73/78 Regulation 9.1.1 ---
UI MPC 98 Rev. 1 Aug. 2018 “Time of the Replacement or Addition” for the Applicable Tier Standard For the Supplement to the IAPP Certificate Jan. 2020
UI MPC 14 Rev. 2 Aug. 2018 Annex VI of MARPOL 73/78 Jan. 2020
UI MPC 12 Rev. 3 Aug. 2018 Annex VI of MARPOL 73/78 Jan. 2020
UI GC28 New Dec. 2018 Guidance for sizing pressure relief systems for interbarrier spaces 1 Jan. 2020
UI GC27 New Dec. 2018 Interpretation of paragraph 13.2.2 1 Jan. 2020
UI GF17 New Dec. 2018 Other rooms with high fire risk 1 Jan. 2020
UI GF16 New Dec. 2018 Liquefied gas fuel tank loading limit higher than 1 Jan. 2020
UI SC288 New Dec. 2018 Carriage of Dangerous Goods – Required Air Changes 1 Jan. 2020
UI MODU3 New Dec. 2018 Selective disconnection or shutdown and equipment operable after an emergency shutdown 1 Jan. 2020
UI SC123 Rev. 4 Nov. 2018 Machinery Installations - Service Tank Arrangements 1 Jan. 2020
UI GC26 New Oct. 2018 Type testing requirements for valves 1 Jan. 2020
UI SC156 Rev.1 Oct. 2018 Doors in watertight bulkhead of cargo ships and passenger ships 1 Jan. 2020
UI SC287 New Jun. 2018 Low pressure audible alarm system 1 Jul. 2019
UI SC286 New Jun. 2018 Operational status of the inert gas system 1 Jul. 2019
UI SC285 New Jun. 2018 Operational status of valves to cargo tanks 1 Jul. 2019
UI SC284 New Jun. 2018 Automatic shutdown of the inert gas system and its components parts 1 Jul. 2019
UI GF15 New Jul. 2018 Alarms for loss of ventilation capacity 1 Jul. 2019
UI GF14 New Jul. 2018 Hazardous area classification of fuel storage hold spaces 1 Jul. 2019
UI GF13 New Jul. 2018 Fire protection of spaces containing equipment for the fuel preparation 1 Jul. 2019
UI GC25 New Jul. 2018 Cargo piping insulation 1 Jul. 2019
UI GC24 New Jul. 2018 Fire Test for Emergency Shutdown Valves 1 Jul. 2019
UI GC23 New Jul. 2018 Cargo tank structure heating arrangement power supply 1 Jul. 2019
UI SC89 Rev.4 Jun. 2018 Ventilation of Cargo Spaces 1 Jan. 2019
UI GC22 New Apr. 2018 Water spray system 1 Jul. 2019
UI COLREG5 New May 2018 Interpretation to COLREG 1972 Annex I Sections 9(a)(i) and 10(a)(i) 1 Jul. 2019
UI SC94 Corr.1 Jan. 2018 Mechanical, hydraulic and electrical independency of steering gear control systems ---