ClassNK releases Guidelines for 3D Model-Based Approval
(Posted on 29/05/26)
ClassNK has released the “Guidelines for 3D Model-Based Approval (3DMBA)”, which summarizes the fundamental principles and standard practices for 3DMBA (3D Model-Based Approval), a next-generation design approval approach in which 3D models serve as the primary basis for approval. At the same time, ClassNK has released its 3DMBA-compatible drawing approval system “NK-PASS*1” and “ClassNK 3DViewer 2,” and has commenced operation of an integrated workflow for 3D model-based design approval.
The guidelines aim to facilitate the smooth execution of approval applications and reviews using 3D models by clarifying the scope of information subject to approval for the handling of design changes, thereby supporting the introduction and operation of 3DMBA, based on a common understanding among shipyards, designers, shipowners, and classification societies. Moreover, the use of the newly released NK-PASS and ClassNK 3D Viewer enables the integrated execution of approval applications and reviews based on Open Class 3D Exchange (OCX)*3. By leveraging 3D models from the early stages of ship design, it is possible to reduce rework and improving the efficiency of design processes.
In recent years, the use of 3D models has been expanding in ship design and production. 3D models not only enable the visual understanding of complex structures and arrangements but also facilitate the accurate communication of design intent and requirements, and are expected to enhance the visualization and accuracy of design information as well as advance design change management. information, and more advanced management. Meanwhile, when 3D models are used as the core of the approval process, it becomes essential for stakeholders to establish a common understanding on key practical matters—such as the scope of design information subject to approval, submission units, treatment of design changes and revisions, and the relationship with conventional 2D drawings. To facilitate the smooth introduction and establishment of 3DMBA, ClassNK considers it indispensable not only to develop supporting systems but also to clearly define the fundamental concepts and operational rules as an approval framework. In collaboration with ten Japanese companies, ClassNK conducted a joint pilot test to verify the feasibility of approval processes using 3D models 4, while also organizing practical challenges and lessons learned for real-world application. The guidelines published today consolidate these outcomes.
? Key features of the guidelines
The guidelines organize practical considerations for implementing approval processes centred on 3D models, including:
- Principles for treating 3D models as approval deliverables
- The scope of design information subject to approval and submission units
- Principles for approval handling in cases of design changes and revisions
- Principles for using 3D models in conjunction with supplementary 2D drawings during a transitional phase
- Handling of 3D models in OCX format
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