ClassNK releases amendments to class rules

(TOKYO) — Classification society ClassNK has announced that it released amendments to its Rules and Guidance for the Survey and Construction of Steel Ships on Dec. 25.

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 relevant international conventions, IACS unified requirements (UR), national regulations, etc.

More specifically, some of the requirements amended this time are as follows:

• Amendment related to the incorporation of material factors for high tensile steel into structural strength requirements of floating docks (to incorporate research and development results)
• Amendment related to the intermittent power demand of motors for steering gear power units marking of safe working loads (in response to industry requests, etc.)
• Amendment related to fuel consumption reporting (in response to changes in international conventions, etc.)
• Amendment related to the testing procedures of watertight compartments (in response to changes in IACS unified requirements, etc.)

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 free of charge, go to ClassNK’s website and click on the “My Page Login” button.

By Professional Mariner Staff