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 Z11 Rev5 CLN
UR Z12 Deleted
Deleted - Sept 2000
UR Z15 Rev1 Corr1 CLN
UR Z16 Rev4 CLN
UR Z17 Rev11 CLN
UR Z18 Rev6 CLN
UR Z19 New
UR Z19 Calibration of measuring equipment - April 1999
UR Z20 New
UR Z20 Planned maintenance scheme (PMS) for machinery - May 2001
UR Z21 Rev4 CLN
UR Z22 Deleted
UR Z23 Rev5 CLN
UR Z24 Corr1 CLN
UR Z25 New
UR Z25 Periodic Survey of Fuel Installations on Ships other than Liquefied Gas Carriers utilizing gas or other low flash point fuels - Jan 2017. Implementation date 1 January 2018.
Note: UR Z25 Rev 1 will come into force on 1 January 2019 and can be found in "Previous Revisions"
UR Z26 New
UR Z26 Alternative Certification Scheme (ACS) - Feb 2015