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 M75 New
UR M75 Ventilation of emergency generator rooms - Feb 2016
UR M76 New
UR M76 Location of fuel tanks in cargo area on oil and chemical tankers - Apr 2016
UR M77 New
UR M77 Storage and use of SCR reductants - Sep 2016
Note: UR M77 will come into force on 1 January 2018.
UR N1 New
UR N1 One man bridge operated (OMBO) ships - 1992
Pipes and Pressure Vessels
UR P1 Rev5 CLN
UR P1 Rules for pipes - Rev.5 Nov 2001
UR P2 Rev2 CLN
UR P4 Rev4 CLN
UR P4 Production and application of plastic pipes on ships - Rev.4 Dec 2008
See also UI LL36 and Recommendations 4 & 5
UR P5 Deleted
Ballast water systems. Requirements on ballast water exchange at sea - Del Apr 2011
UR P6 Rev1 CLN
Strength of Ships
UR S1 Rev7 CLN
UR S1A Rev6 CLN
UR S2 Rev1 CLN
UR S3 Rev1 CLN
UR S4 Rev4 CLN
UR S5 Rev1 CLN