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 E23 Deleted

UR E23 Selection of low voltage circuit breakers on the basis of their short circuit capacity and co-ordination in service - Deleted Mar 2011

UR E24 New

Harmonic Distortion for Ship Electrical Distribution System including Harmonic Filters - June 2016

UR E25 New

Failure detection and response of all types of steering control system - June 2016 


Fire Protection

UR F1 Rev1 CLN

UR F1 Cathodic protection on oil tankers - Rev.1 June 2002

UR F2 Rev2 CLN

UR F2 Aluminium coatings on board oil tankers and chemical tankers - Rev.2 Nov 2012

UR F3 New

UR F3 Tank cleaning openings - 1971

UR F4 Deleted

Deleted 1987

UR F5 Rev1 CLN

UR F5 Pump room alarms - Rev.1 1973

UR F6 Rev1 CLN

UR F6 Standardisation of flash points - Rev.1 1996

UR F7 Rev2 CLN

UR F7 Portable instruments for measuring oxygen and flammable vapour concentrations - Rev.2 May 1999

UR F8 Rev1 CLN

UR F8 Pressurisation of cargo tanks - Rev.1 1989

UR F9 Deleted

Lighting and sighting ports in pump room/engine room bulkheads - Deleted Dec 2013

UR F10 Deleted

Deleted 1986

UR F11 Deleted

Deleted 1986

UR F12 Deleted


UR F13 Rev1 CLN

UR F13 Gland seals in pump room bulkheads - Rev.1 1977

UR F14 Deleted

Deleted 1996

UR F15 Rev5 CLN

UR F15 Piping passing through dangerous zones - Rev.5 1996

UR F16 Rev1 CLN

UR F16 Bow and stern loading and unloading arrangements on oil tankers - Rev.1 June 2000

Forgotten Password

Please enter your email address here and you'll receive an email with instructions on how to reset your password.