Unified Requirements

Explanation

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 M13 Rev1 CLN

UR M13 Re-categorised as “Recommendation” No.28 Rev.1 CLN

UR M14 Deleted

Mass production of internal combustion engines: definition of mass production - Deleted Feb 2015

UR M15 Deleted

Re-categorized as “Recommendation” No. 29

UR M16 Rev1 CLN

UR M16 Devices for emergency operation of propulsion steam turbines - Rev.1 Jan 2005

UR M17 Deleted

Deleted 1 July 1998

UR M18 Deleted

Parts of internal combustion engines for which material tests are required - Deleted Feb 2015

UR M19 Deleted

Parts of internal combustion engines for which nondestructive tests are required - Deleted Feb 2015

UR M20 Deleted

Periodical survey of machinery - Deleted Nov 2001

UR M21 Deleted

Mass production of internal combustion engines: type test conditions - Deleted Feb 2015

UR M23 Deleted

Mass production of engines: mass produced exhaust driven turboblowers - Deleted Feb 2015

UR M24 Rev1 CLN

UR M24 Requirements concerning use of crude oil or slops as fuel for tanker boilers - Rev.1 1976

UR M25 Rev3 CLN

UR M25 Astern power for main propulsion - Rev.3 July 2003.

Note: UR M25 Rev 4 will come into force on 1 July 2018 and can be found in "Previous Revisions" 

UR M26 Corr1 CLN

UR M26 Safety devices of steam turbines - Corr.1 Feb 2005

UR M27 New

UR M27 Bilge level alarms for unattended machinery spaces - 1976

UR M28 New

UR M28 Ambient reference conditions - 1978

UR M29 Rev3 CLN

UR M29 Alarm systems for vessels with periodically unattended machinery spaces - Rev.3 1997

UR M30 Rev1 CLN

UR M30 Safety systems for vessels with periodically unattended machinery spaces - Rev.1 1997

UR M31 New

UR M31 Continuity of electrical power supply for vessels with periodically unattended machinery spaces - 1978

UR M32 Deleted

Definition of diesel engine type - Deleted Feb 2015

UR M33 Deleted

Scantlings of intermediate shafts - Deleted Feb 2005

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