IACS - International Association of Classification Societies ltd.
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IACS produces a range of documentation to help promote consistency throughout the member societies. This area provides access to technical resolutions produced by IACS.

Note to Classification Societies which are not Members of IACS

IACS publishes all Unified Requirements ("URs"), including CSR, and technical background ("TB") information on the IACS website. Any classification society which is not a member of IACS may register with IACS for free RSS newsfeeds with updates of all IACS' new publications by navigating to the page it wants to subscribe to and using the RSS link on that page. By clicking on the RSS link the classification society can add its contact details for subscription.

Notwithstanding the intellectual property rights held by IACS Members in IACS' URs and the related TB information, all classification societies are free to use the URs (including CSR) by effectively embedding them into their own published rules. Classification societies are also at liberty to enter into any agreement with any IACS member in relation to the provision of further information or assistance.

In the event that any classification society decides to embed IACS' requirements into its own rules, it will be the responsibility of that classification society to verify the contents and the application of those requirements. The classification society's right to incorporate IACS' requirements into its own rules implies no representation by IACS or its Members that the classification society in question is operating in compliance with those requirements. IACS and IACS' Members accept no liability (in contract, tort or otherwise) for any defect or deficiency in IACS' unified requirements and the related information or for any resulting damage.

The Procedure governing applications for confirmation by IACS that an entity is a classification society is explained in IACS' Procedures Volume 2, Section C.

Blue Book

Users may wish to download the January 2017 version of the IACS Blue Book which contains amendments to IACS Resolutions in addition to the current issues of resolutions.

How to download and use:

Copyright Notice

© IACS - the International Association of Classification Societies and International Association of Classification Societies Limited 2013

All rights reserved.


The content in this Website and the material available on it, including (without limitation) the IACS Blue Book, (together, the "Website Materials") are offered as a helpful resource for you and your company and is designed to help you obtain information and guidance.

While every effort has been made to ensure the accuracy of information presented, the International Association of Classification Societies, its members and International Association of Classification Societies Limited (together, "IACS") make no representations or warranties as to the completeness or accuracy of information in the Website Materials.

Furthermore IACS hereby disclaims all responsibility for and accepts no liability for any errors or losses caused by any incompleteness or inaccuracies of such information or the consequences of any person acting or refraining from acting or otherwise relying on such information.

IACS is the owner or licensee of the copyright, database rights and all other intellectual property rights in the Website Materials. Such material is protected by laws and treaties throughout the world.

The trade marks and logos ("Marks") displayed on the Website Materials are the property of or licensed to IACS. You are not permitted to use these Marks without the prior written consent of IACS.

You may download and use the Website Materials only in accordance with the Guidelines and Terms and Conditions.

PART A: ZIP file

Due to the large file size the ZIP file will take some time to download depending on your internet connection speed. Below is a table to give you some idea how long this may take, these times can obviously vary due to fluctuations in connections.

File SizeTransfer SpeedTime to download
647 Mb1.544 Mbps T1/DS159 mins
10 Mbps Thin Ethernet9 mins
44 Mbps T3/DS32 mins
100 Mbps Fast Ethernet54 secs

Please note, once the file is downloaded to desktop or laptop, there is no need for internet connection as all files will reside on the local disk and there will not be a need for downloading any further files until the next revision (circa a year's time).

Click on the link here and choose to save it http://www.iacs.org.uk/document/public/Publications/BBJan17.zip (647Mb)

Using a program such as WinZip or WinRAR extract the folders and files contained within to your own computer or tablet

To view the Portable Document Format (PDF) files you must have Adobe Acrobat Reader or Exchange installed on your system.

If not already installed on your system, please install the Adobe Acrobat Reader software from the Adobe website (www.adobe.com) or App Store/Marketplace etc.

After installing Adobe Acrobat Reader, open the file entitled "Welcome.pdf" to begin to view the IACS Blue Books. Then follow the links as required.

PART B: Perform "Search" command using the index

The Blue Book has been indexed as follows:

(1) complete indexing
This is to help the users find a word throughout the Blue Book. If you want to search the documents containing a specific word in all IACS Resolutions, please use the index named "index.pdx".

(2) You may be asked to choose where you would like to search. Select "In the index named index.pdx".