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 M54 Deleted
UR M55 Deleted
Planned maintenance scheme (PMS) for machinery - Deleted May 2001
UR M56 Rev3 CLN
UR M57 New
Use of ammonia as a refrigerant - 1993
UR M58 Deleted
Charge air coolers - Deleted Feb 2015
UR M59 New
UR M59 Control & safety systems for dual fuel diesel engines - 1996
UR M60 New
UR M60 Control and safety of gas turbines for marine propulsion use - 1997
UR M61 New
UR M61 Starting arrangements of internal combustion engines - Dec 2003
UR M62 Deleted
Rooms for emergency fire pumps in cargo ships - Deleted June 2014
UR M63 New
UR M63 Alarms and safeguards for emergency diesel engines - Jan 2005
UR M64 Rev1 CLN
UR M64 Design of integrated cargo and ballast systems on tankers - Rev.1 July 2004
UR M65 Rev1 CLN
UR M65 Draining and pumping forward spaces in bulk carriers - Rev.1 July 2004
UR M66 Rev3 CLN
UR M66 Type testing procedure for crankcase explosion relief valves - Rev.3 Jan 2008
UR M67 Rev2 CLN
UR M68 Rev2 CLN
UR M69 New
UR M69 Qualitative failure analysis for propulsion and steering
on passenger ships - June 2008
UR M72 Rev1 CLN