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 A2 Rev3 Corr1 CLN
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 D5 Rev3 CLN
UR D5 Column stabilized drilling units - Rev.3 1996
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 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