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 F17 Deleted

Deleted 1996

UR F18 Deleted

Deleted 1997

UR F19 Deleted

Deleted 1988

UR F20 Rev7 CLN

UR F20 Inert gas systems - Rev.7 May 2015

UR F21 New

UR F21 Pump room ventilation - 1974

UR F22 New

UR F22 Direct loading pipes to oil tanker cargo tanks - 1974

UR F23 Deleted

Deleted 1996

UR F24 Rev2 CLN

UR F24 Temperature of steam and heating media within the cargo area - Rev.2 May 1998

UR F25 Deleted

Deleted 1987

UR F26 Rev3 CLN

UR F26 Safety aspects of double bottoms and duct keels under cargo oil tanks - Rev.3 May 2004

UR F27 New

UR F27 Cargo openings in the bottoms of topside tanks of ships carrying alternatively oil and grain - 1978

UR F28 Deleted

Deleted 1987

UR F29 Rev6 CLN

UR F29 Non-sparking fans - Rev.6 June 2005

UR F30 Deleted

Deleted Feb 2002

UR F31 Deleted


UR F32 New

UR F32 Fire detecting system for unattended machinery spaces - 1976

UR F33 New

Prohibition of carriage in fore peak tanks of oil or other liquid substances which are flammable - 1981

UR F34 Deleted

Deleted July 2010

UR F35 Rev8 CLN

UR F35 Fire protection of machinery spaces - Rev.8 June 2005

UR F36 Deleted

Deleted 1989

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