A short series on the standards that decide whether your offshore equipment can be lifted at all.
DNV 2.7-1 & 2.7-3, Explained Simply
DNV-ST-E271 and DNV-ST-E273 cover different types of offshore equipment, so the certification basis needs to match the unit and its intended use. This series looks at the practical decisions behind DNV 2.7-1 and DNV 2.7-3: what the standards cover, where they affect engineering and fabrication, and what should be clarified before the project is committed.
Start with the standard that matches the equipment
DNV requirements affect more than the final certification step. The chosen standard can influence the design basis, structural margins, lifting points, materials, welding, inspection, testing and the documentation that follows the equipment through delivery. The important decision is therefore not simply whether a project needs DNV involvement, but which DNV route applies before engineering and fabrication are committed.
For offshore containers and portable offshore units, the first comparison is often DNV 2.7-1 versus DNV 2.7-3. If the unit falls under DNV 2.7-3, the design standard and risk-based class need to be understood early. For DNV 2.7-1 equipment, container type, load path and lifting arrangement all influence the route forward.
Compliance has to follow the physical build
A technically sound design can still create delays if the certification plan arrives too late. Material traceability, welding qualifications, inspection points and test requirements need to be built into the execution sequence while the equipment is being produced. The same applies when existing equipment is repaired or modified: the change has to be assessed against the certification basis, not treated as a separate workshop task.
For DNV 2.7-1 projects, it helps to separate the job into three practical questions:
- What type of offshore container or unit is being built, and what design requirements follow from that?
- What must be controlled during fabrication, inspection and testing?
- What has to remain traceable after delivery, including periodic inspection and later modifications?
The articles below cover those decisions in more detail, including offshore container design requirements, testing and certification and periodic inspection after certification.
When the project needs more than an interpretation of the standard
GravityX can support the execution around the requirement as well — from engineering through fabrication planning, supplier coordination and compliance-driven project execution. The aim is to resolve the certification basis early enough that it guides the work instead of becoming a recovery task near the end.