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 January to December 2018
• IACS Technical Resolutions adopted from January to December 2017
• 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 M77	Rev.1	Aug. 2019	Storage and use of SCR reductants	Jan. 2021
UR M53	Rev.4	Aug. 2019	Calculations for I.C. Engine Crankshafts	1 Jan. 2021
UR W35	New	Jun. 2019	Requirements for NDT Suppliers	1 Jul. 2020
UR S11	Rev.9	Jun. 2019	Longitudinal Strength Standard	1 Jul. 2020
UR S5	Corr.1	Jun. 2019	Calculation of midship section moduli for conventional ship for ship's scantlings	---
UR S2	Rev.2	Jun. 2019	Definition of ship’s length L and of block coefficient Cb	1 Jul. 2020
UR Z1	Rev.7	May 2019	Annual and intermediate classification survey coverage of IMO Resolution A.1120(30)	---
UR Z20	Rev.2	May 2019	Planned Maintenance Scheme (PMS) for Machinery	1 Jul. 2020
UR Z15	Rev.3	May 2019	Hull, Structure, Equipment and Machinery Surveys of Mobile Offshore Drilling Units	1 Jul. 2020
UR Z10.5	Rev.19	May 2019	Hull Surveys of Double Skin Bulk Carriers	1 Jul. 2020
UR Z10.4	Rev.16	May 2019	Hull Surveys of Double Hull Oil Tankers	1 Jul. 2020
UR Z10.3	Rev.19	May 2019	Hull Surveys of Chemical Tanker	1 Jul. 2020
UR Z10.2	Rev.36	May 2019	Hull Surveys of Bulk Carriers	1 Jul. 2020
UR Z10.1	Rev.24	May 2019	Hull Surveys of Oil Tankers	1 Jul. 2020
UR Z7.2	Rev.8	May 2019	Hull Surveys for Liquefied Gas Carriers	1 Jul. 2020
UR Z7.1	Rev.15	Jun. 2019	Hull Surveys for General Dry Cargo Ships	1 Jul. 2020
UR Z7	Rev.28	May 2019	Hull Classification Surveys	1 Jul. 2020
UR A3	Rev. 1	Jun. 2019	Anchor Windlass Design and Testing	Jul. 2020
UR M80	New	May. 2019	Requirements for the AC Generating sets	1 Jul. 2020
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 SC289	Del.	Jul. 2019	Separation arrangements between inert gas piping and cargo tanks	---
UI GC13	Rev.2	May 2019	Examination before and after the first loaded voyage	1 Jul. 2020
UI GC29	New	May 2019	Integrated system	1 Jul. 2020
UI GC25	Rev.1	May 2019	Cargo piping insulation	1 Jul. 2020
UI GC21	New	Apr. 2019	Welds of type C independent bi-lobe tank with centreline bulkhead	1 Jul. 2020
UI GC20	New	Apr. 2019	Tee welds in type A or type B independent tanks	1 Jul. 2020
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	Jun. 2019	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	---