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 M34 New
UR M34 Scantlings of coupling flanges - 1980
UR M35 Rev7 CLN
UR M36 Rev5 CLN
UR M37 Deleted
Scantlings of propeller shafts - Deleted Feb 2005
UR M38 Deleted
k-factors for different shaft design features (intermediate shafts) - Deleted Feb 2005
UR M39 Deleted
k-factors for different shaft design features (propeller shafts) - Deleted Feb 2005
UR M40 New
UR M40 Ambient conditions – temperatures - 1981
UR M41 Deleted
Superseded by UR E10 (1991)
UR M43 New
UR M43 Bridge control of propulsion machinery for unattended machinery spaces - 1982
UR M44 Rev9 Corr2 CLN
UR M46 Rev1 CLN
UR M46 Ambient conditions – inclinations - Rev.1 June 2002
UR M47 New
UR M47 Bridge control of propulsion machinery for attended machinery spaces - 1983
UR M48 Deleted
Permissible limits of stresses due to torsional vibrations for intermediate, thrust and propeller shafts - Deleted Feb 2005
UR M49 Deleted
Availability of machinery - Deleted Dec 2003
UR M50 Deleted
Programme for type testing of non–mass produced i.c. engines - Deleted Feb 2015
UR M51 Rev4 CLN
UR M52 New
UR M52 Length of aft stern bush bearing - 1986