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 S7 Rev4 CLN

UR S7 Minimum Longitudinal Strength Standards - Rev.4 May 2010

UR S8 Rev4 CLN

UR S8 Bow Doors and Inner Doors - Rev.4 Dec 2010

UR S9 Rev6 CLN

UR S9 Side Shell Doors and Stern Doors - Rev.6 Dec 2010

UR S10 Rev4 Corr1 CLN

UR S10 Rudders, Sole Pieces and Rudder Horns - Rev.4 Corr.1 Dec 2015

UR S11 Rev8 CLN

Longitudinal Strength Standard - Rev.8 Jun 2015

UR S11A New

UR S11A Longitudinal Strength Standard for Container Ships - June 2015

UR S12 Rev5 CLN

UR S12 Side Structures in Single Side Skin Bulk Carriers - Rev.5 May 2010

UR S13 Rev2 Corr1 CLN

UR S13 Strength of Bottom Forward in Oil Tankers - Rev.2 Corr.1 May 2014

UR S14 Rev5 CLN

UR S14 Testing Procedures of Watertight Compartments - Rev.5 Jan 2015

Note: UR S14 Rev 6 will come into force on 1 January 2018 and can be found in "Previous Revisions" 

UR S15 Rev1 CLN

UR S15 Side Shell Doors and Stern Doors - Retrospective Application of UR-S9 to Existing Ro-Ro Passenger Ships - Rev.1 Nov 2003

UR S16 Rev1 Corr1 CLN

UR S16 Bow Doors and Inner Doors - Retrospective Application of UR-S8, as amended 1995, to existing Ro-Ro Passenger Ships - Rev.1 Corr.1 Aug 2004

UR S17 Rev9 CLN

UR S17 Longitudinal Strength of Hull Girder in Flooded Condition for Non-CSR Bulk Carriers - Rev.9 Apr 2014

UR S18 Rev9 CLN

UR S18 Evaluation of Scantlings of Corrugated Transverse Watertight Bulkheads in Non-CSR Bulk Carriers Considering Hold Flooding - Rev.9 Apr 2014

UR S19 Rev5 CLN

UR S19 Evaluation of Scantlings of the Transverse Watertight Corrugated Bulkhead Between Cargo Holds Nos. 1 and 2, with Cargo Hold No. 1 Flooded, for Existing Bulk Carriers - Rev.5 July 2004

UR S20 Rev6 CLN

UR S20 Evaluation of Allowable Hold Loading for Non-CSR Bulk Carriers Considering Hold Flooding - Rev.6 Apr 2014

UR S21 Rev5 CLN

UR S21 Evaluation of Scantlings of Hatch Covers and Hatch Coamings of Cargo Holds of Bulk Carriers, Ore Carriers and Combination Carriers - Rev.5 May 2010

UR S21A Rev1 CLN

UR S21A Evaluation of Scantlings of Hatch Covers and Hatch Coamings and Closing Arrangements of Cargo Holds of Ships - Rev.1 May 2015 Clean

UR S22 Rev3 CLN

UR S22 Evaluation of Allowable Hold Loading of Cargo Hold No.1 with Cargo Hold No.1 Flooded, for Existing Bulk Carriers - Rev.3 July 2004

UR S23 Rev4 CLN

Implementation of IACS Unified Requirements S19 and S22 for Existing Single Side Skin Bulk Carriers - Rev.4 Aug 2007

UR S24 Deleted

Deleted Jan 2004

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