Unified Requirements


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 Z11 Mandatory ship type and enhanced survey programme (ESP) notations - Rev.5 Sept 2015

UR Z12 Deleted

Deleted - Sept 2000

UR Z13 Rev3 CLN

UR Z13 Voyage repairs and maintenance - Rev.3 Jan 2011

UR Z15 Rev1 Corr1 CLN

UR Z15 Hull, structure, equipment and machinery surveys of mobile offshore drilling units - Rev.1 Corr.1 Oct 2016

UR Z16 Rev4 CLN

UR Z16 Periodical surveys of cargo installations on ships carrying liquefied gases in bulk Rev.4 Oct 2013

UR Z17 Rev11 CLN

UR Z17 Procedural requirements for service suppliers - Rev.11 June 2015 Clean

Note: UR Z17 Rev 12 will come into force on 1 January 2018 and can be found in "Previous Revisions" 

UR Z18 Rev6 CLN

UR Z18 Periodical survey of machinery - Rev.6 Aug 2016. Implementation date 1 July 2017.

UR Z18 Rev 7 will come into force on 1 July 2018 and can be found in "Previous Revisions" 

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 Z21 Surveys of propeller shafts and tube shafts - Rev.4 Oct 2015

UR Z22 Deleted

Survey requirements for automatic air pipe heads - Deleted July 2014

UR Z23 Rev5 CLN

UR Z23 Hull survey for new construction - Rev.5 Feb 2015 Clean

Note: UR Z23 Rev 6 will come into force on 1 January 2018 and can be found in "Previous Revisions" 

UR Z24 Corr1 CLN

UR Z24 Survey requirements for shell and inner doors of ro-ro ships - Corr.1 July 2011

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

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