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 W11 Rev8 CLN
UR W12 Deleted
UR W13 Rev5 Corr1 CLN
UR W14 Rev2 CLN
UR W14 Steel plates and wide flats with specified minimum through thickness properties (“Z” quality) Rev.2 May 2004
UR W15 Deleted
UR W16 Rev3 CLN
UR W17 Rev4 CLN
UR W18 Rev5 CLN
UR W18 Anchor chain cables and accessories including chafing chain for emergency towing arrangements - Rev.5 May 2004
UR W19 Deleted
Normal and higher strength hull structural steel grades E and E36 with thicknesses above 50 up to 100 mm - superseded by W11, - Deleted 1995
UR W20 Deleted
Higher strength hull structural steels with a minimum yield strength of 390 N/mm2 - superseded by W11, - Deleted 1995
UR W21 Deleted
Hull structural steels for low temperature application - superseded by W11, - Deleted 1995
UR W23 Rev1 CLN
UR W23 Approval of welding consumables for high strength quenched and tempered steels for welded structures - Rev.1 1997
UR W24 Rev3 Corr1 CLN
UR W25 Rev5 CLN
UR W26 Rev1 CLN
UR W26 Requirements for welding consumables for aluminium alloys - Rev.1 June 2005
UR W27 Rev1 CLN
UR W27 Cast steel propellers - Rev.1 May 2004
UR W28 Rev2 CLN
UR W29 New
UR W29 Requirements for manufacture of anchors - June 2005