Classification society ClassNK has released its Guidelines for 3D Model-Based Approval, outlining the fundamental principles and standard practices for design approval where 3D models serve as the primary basis.
Alongside the guidelines, the society has launched a compatible drawing approval management system, NK-PASS, and its ClassNK 3DViewer, providing tools for an integrated workflow for 3D model-based design approval.
The guidelines aim to facilitate smooth approval applications and reviews by clarifying the scope of information required for handling design changes. This framework supports the introduction and operation of 3D Model-Based Approval (3DMBA) based on a common understanding among shipyards, designers, shipowners, and classification societies.
To establish a 3D model-centric approval process, stakeholders require a common understanding of key practical matters, such as submission units, the treatment of revisions, and the relationship with conventional 2D drawings. To verify the feasibility of this approach, ClassNK conducted a joint pilot test with ten Japanese companies to identify practical challenges and lessons learned, consolidating the outcomes into the published document.
The guidelines organise practical considerations for implementation. Key features include principles for treating 3D models as approval deliverables, defining the scope of design information, and managing approvals during design changes. It also covers the temporary use of 3D models alongside supplementary 2D drawings during a transitional phase, as well as the handling of models in the Open Class 3D Exchange (OCX) format.
The class society’s newly operational system allows users to submit and review OCX-based 3D models through the NK-PASS platform, with the ClassNK 3DViewer rendering the data to support broader digital workflows.
