Unified Requirements


Unified Requirements are adopted resolutions on matters directly connected to or covered by specific Rule requirements and practices of classification societies and the general philosophy on which the rules and practices of classification societies are established.

Subject to ratification by the governing body of each Member Society, Unified Requirements shall be incorporated in the Rules and practices of the Member Societies, within one year of approval by the IACS General Policy Group. 

The existence of a UR does not oblige a Member Society to issue respective Rules if it chooses not to have Rules for the type of ship or marine structure concerned.

Unified Requirements are minimum requirements. Each Member remains free to set more stringent requirements.

The technical backgrounds (development histories) of Unified Requirements since 1999 can be found by following this link.

A list of the IACS working groups responsible for each Unified Requirement may be found here.

UR Implementation Status 2017

FORM X - Notice of Reservations; FORM Y- Expected Implementation Dates; FORM Z- URs Not Applicable to Members


Mooring and Anchoring - March 2017

UR A1 Rev5 CLN

UR A1 Rev.5 June 2005 Clean

Note: UR A1 Rev 6 Corr2 will come into force on 1 July 2018 and can be found in "Previous Revisions" 

UR A2 Rev3 Corr1 CLN

UR A2 Rev3 Corr1 Sep 2014 Clean

Note: UR A2 Rev 4 Corr2 will come into force on 1 July 2018 and can be found in "Previous Revisions" 

UR A3 New

Anchor Windlass Design and Testing adopted on June 2017.

Note: UR A3 will come into force on 1 July 2018.


Mobile Offshore Drilling Units

UR D1 Rev4 CLN

Requirement concerning offshore drilling units and other similar units - July 2004

UR D2 Rev2 CLN

Definitions - Rev.2 1996

UR D3 Rev5 CLN

UR D3 General design parameters - Rev. 5 Jan 2012 Clean

UR D4 Rev3 CLN

UR D4 Self-elevating drilling units - Rev.3 Jan 2012

UR D5 Rev3 CLN

UR D5 Column stabilized drilling units - Rev.3 1996

UR D6 Rev1 CLN

UR D6 Surface type drilling units - Jan 2012

UR D7 Rev3 CLN

UR D7 Watertight integrity - Rev.3 Jan 2012

UR D8 Rev2 CLN

UR D8 Hazardous areas - Rev.2 1996

UR D9 Rev3 CLN

UR D9 Rev.3 Machinery

UR D10 Rev2 CLN

Electrical installations - Rev.2 1990

UR D11 Rev3 CLN

UR D11 Safety features - Rev.3 Jan 2012

UR D12 Deleted

UR D12 was re-categorized as UR Z15 in August 2002.



UR E1 New

UR E1 Governing characteristics of generator prime movers see revised M 3.2

Forgotten Password

Please enter your email address here and you'll receive an email with instructions on how to reset your password.