DNV 2.7-1 Offshore Container Design
WHAT WE DO
An offshore container is repeatedly lifted between vessels and installations in conditions that are very different from ordinary terminal transport. That changes the design problem. The frame, lifting points, primary structure and protective features need to work as one system.
The certificate comes later. The decisions that make certification possible are made while the load path, geometry and fabrication details are still being engineered.
Start with the load path
The primary structure needs a clear route for transferring lifting and operational loads through the unit. Corner posts, top and bottom members, pad eyes and their supporting structure therefore need to be considered together. Local reinforcement cannot compensate for a structural concept that sends forces through the wrong parts of the frame.
Lifting points are structural details
Pad eyes are not accessories added after the container has been designed. Their geometry, material, weld details and connection into the primary structure influence both engineering and fabrication. Access for welding and inspection needs to be considered while those details can still be changed.
Offshore handling affects the geometry
Protruding equipment, vulnerable components and exposed surfaces can create problems during lifting, landing and handling. The design therefore has to consider how the finished unit will actually be used, not only whether the static model closes.
The drawing is not the end of the design problem
A structurally correct model can still be difficult to fabricate under a controlled certification route. Material traceability, weld access, qualified procedures, inspection points and dimensional control all have to survive the transition from engineering to the workshop.
This is where projects often lose time. Engineering may optimise a detail without checking fabrication access. Production may change a detail for buildability without recognising that it affects an approved load path. Inspection can then identify the conflict only after the structure is largely complete.
The better route is to treat design and fabrication planning as connected activities. Resolve the container category first. Establish the structural concept and lifting arrangement. Then review whether the workshop can reproduce and inspect the design as intended before steel is cut.
If the unit does not fit the offshore-container concept, the decision between DNV 2.7-1 and DNV 2.7-3 belongs at this stage as well.
GravityX approaches compliance-driven projects with engineering, fabrication and inspection connected around the same design basis. The objective is not more documentation. It is fewer late surprises between drawing approval and finished equipment.
Build a clear load path
Design for fabrication
