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 K3 Corr2 CLN
UR K3 Keyless Fitting of Propellers without Ice Strengthening - Corr.2 June 1998
Subdivision, Stability and Load Line
UR L1 Deleted
UR L3 Deleted
Intact stability of tankers during liquid transfer operations - Deleted May 2001
UR L4 Rev3 Corr1 CLN
UR L5 Rev2 Corr1 CLN
UR M1 Deleted
Cylinder overpressure monitoring of internal combustion engines - Deleted Aug 2004
UR M2 New
UR M2 Alarm devices of internal combustion engines - 1971
UR M3 Rev5 CLN
UR M3 Speed governor and overspeed protective device - Rev.5 Feb 2006
UR M4 Deleted
UR M5 Deleted
Mass production of internal combustion engines, procedure for inspection - Deleted Feb 2015
UR M6 Deleted
Test pressures for parts of internal combustion engines 1) - Deleted Feb 2015
UR M7 Deleted
Re-categorized as “Recommendation” No. 26
UR M8 Deleted
Re-categorized as “Recommendation” No. 27
UR M9 Rev3 Corr2 CLN
UR M9 Crankcase explosion relief valves for crankcases of internal combustion engines - Rev.3 Corr.2 Sept 2007
UR M10 Rev4 CLN
UR M11 New
UR M11 Protective devices for starting air mains - 1972
UR M12 New
UR M12 Fire extinguishing systems for scavenge manifolds - 1972