DNV container recertification is the periodic inspection and re-certification process for offshore containers built to the DNV offshore container standard, commonly called DNV 2.7-1 or the newer DNV-ST-E271 standard. These are the containers used on offshore oil & gas platforms, wind farms, and marine projects.
Unlike standard shipping containers, DNV offshore containers are designed for:
- Heavy lifting in rough sea conditions
- Repeated crane handling
- Dynamic offshore loads
- Harsh marine environments
A DNV recertification confirms the container is still structurally safe and compliant for offshore lifting operations.
What the recertification involves
Typical DNV recertification includes:
- Visual structural inspection
- Weld inspection
- NDT testing (MPI or ultrasonic checks)
- Pad eye and lifting point inspection
- Sling and shackle examination
- Door, floor, and frame checks
- Corrosion assessment
- Dimensional and marking verification
- Load testing if required
- Review of previous certification records
The inspection is normally carried out by a certified inspector or surveyor working to DNV-ST-E271 / ISO 10855 requirements.
How often is recertification required?
For offshore containers:
- Periodic inspection is commonly required every 12 months
- More detailed examinations are often required every 4–5 years
- Lifting sets/slings may require shorter inspection intervals
For CSC-certified shipping containers:
- First inspection: within 5 years of manufacture
- Then every 30 months under the PES scheme, or under an ACEP continuous inspection programme
Difference between DNV and CSC recertification
| Feature | DNV Offshore Container | CSC Shipping Container |
|---|---|---|
| Main use | Offshore lifting and transport | Standard international shipping |
| Standard | DNV-ST-E271 / ISO 10855 | CSC / ISO 1496 |
| Inspection focus | Lifting safety and structural fatigue | Transport safety and stacking |
| Inspection frequency | Usually annual | Usually every 30 months |
| Environment | Offshore / marine | General freight |
| Lifting slings included | Yes | Normally no |
What happens after passing inspection?
If the container passes:
- A new inspection certificate is issued
- Inspection records are updated
- The container remains approved for offshore use
- CSC plates or DNV plates may be updated depending on certification type
If defects are found:
- Repairs must be completed
- Weld repairs may require re-testing
- The container may need load testing before re-certification
Many offshore containers hold both:
- DNV certification for offshore lifting
- CSC certification for transport on ships and roads
