Press Release

ClassNK releases comprehensively revised structural rules

1 July 2022

Tokyo - Leading Classification Society ClassNK released a comprehensively revised version of Part C of its Rules and Guidance for the Survey and Construction of Steel Ships setting the requirements for hull structures on 1 July 2022.

ClassNK is constantly revising its Rules and Guidance in order to reflect the latest results from relevant research and development projects, feedback from damage investigations, requests from industry, as well as changes made to the relevant regulations such as international conventions.

Like many other industries, the maritime industry is faced with the challenges of rapid digital technology advances and decarbonization. To support not only various design concepts responding to digitalization and environmental issues but also more flexible hull structure design utilizing innovative technology, ClassNK recently completed a comprehensive revision of its structural rules. They have evolved into data-driven structural rules that incorporate “Design by Analysis” concept throughout them, enabling more rational hull structure design and strength assessment while maintaining sufficient safety.

Following the publication of the rules, information on the comprehensive revision and the rules themselves are available on the ClassNK website.


ClassNK also released rule updates dated 30 June 2022, including followings:

In response to industry requests;
- Amendment related to the “Comprehensive Review of the Rules for the Survey and Construction of Steel Ships Part B (Propeller Shaft and Stern Tube Shaft Surveys)” and the “Tests for Semiconductor Converters for Power, etc.”.
In response to changes in international conventions;
- Amendment related to the "Exemptions for Unmanned Non-Self-Propelled (UNSP) Barges”, the “Classification of Hazardous Areas for the Insides and Surroundings of Gas Admission Valves for Gas-fuelled Engines” and the “Energy Efficiency Existing Ship Index (EEXI) and Carbon Intensity Indicator (CII)”.
In response to changes in IACS unified requirements;
- Amendment related to the “Impact Test of Steels for Low Temperature Service”.

The PDF files of ClassNK Rules and Guidance are available free of charge via ClassNK’s website for those who have registered for the ClassNK “My Page” service. To register for the “My Page” service, go to ClassNK’s website and click on the “My Page Login” button.

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