In the demanding world of offshore operations, DNV offshore containers are a critical link in ensuring safe, efficient, and compliant transport of equipment, tools, and materials. As an integrated engineering and fabrication partner, we provide DNV-certified offshore containers designed and manufactured to meet the harshest marine and offshore environments while fully complying with the latest DNV 2.7-1 / EN 12079 requirements.

This comprehensive guide explains what DNV offshore containers are, how they are classified, key design and safety features, inspection and certification requirements, and how to select the right offshore container solution for your projects.

What Is a DNV Offshore Container?

A DNV offshore container is a purpose-built transport unit designed to handle lifting, storage, and transportation of cargo between supply bases and offshore installations such as platforms, FPSOs, drilling rigs, and wind farms. Unlike conventional ISO containers, DNV offshore containers are engineered to withstand:

• Dynamic lifting operations by offshore cranes
• Rough sea conditions and heavy impacts
• Harsh weather, including saltwater corrosion and extreme temperatures
• Frequent handling cycles with high safety factors

These containers are designed, tested, and certified according to DNV 2.7-1 and often comply with EN 12079 and related offshore container standards, ensuring the highest levels of structural integrity, lifting safety, and operational reliability.

DNV Standards and Certifications for Offshore Containers

DNV 2.7-1 Standard

The DNV 2.7-1 Offshore Containers standard defines the minimum requirements for:

• Design and structural analysis
• Materials and welding quality
• Lifting sets and sling arrangements
• Mechanical strength and impact resistance
• Testing, inspection, and marking

Compliance with DNV 2.7-1 ensures that the offshore container can safely withstand the dynamic loading associated with offshore crane operations in rough seas.

EN 12079 Compatibility

Many DNV-certified offshore containers are also designed according to EN 12079, the European standard for offshore containers and associated lifting sets. Together, these standards ensure:

• Consistent quality across the global industry
• Compatibility with international offshore logistics requirements
• Harmonised safety expectations between operators, contractors, and suppliers

Certification and Type Approval

Each DNV offshore container must undergo:

• Design review and calculation verification
• Prototype testing (including load and impact tests)
• Manufacturing surveillance
• Final inspection and certification

The container receives a DNV type approval certificate and is marked with a unique identification number, working load limit (WLL), tare weight, and other essential technical data.

Key Types of DNV Offshore Containers

To support diverse offshore operations, there is a wide range of DNV 2.7-1 offshore container types, each optimised for a specific application:

1. Offshore Cargo Carrying Units (CCUs)

DNV Offshore CCUs are versatile containers used to transport general equipment, tools, and consumables. Features typically include:

• Robust corner posts and frame structure
• Forklift pockets for onshore handling
• Internal lashing points to secure cargo
• Optional removable lids or tarpaulin covers

2. Offshore Dry Goods Containers

These are closed-top DNV containers for safe storage and transport of sensitive equipment and materials. Typical versions include:

• Standard dry containers with side or double doors
• Office containers or workshop modules
• Storage containers with shelving and interior fittings

They are ideal for long-term offshore storage, ensuring protection from seawater ingress, UV radiation, and mechanical damage.

3. Offshore Open Top and Half-Height Containers

For heavy or oversized items, open top and half-height offshore containers are used:

• Open Top Containers – suited for tall equipment loaded by crane
• Half-Height Containers – optimised for dense, heavy cargo such as drill collars, pipes, or bulky components

Their low centre of gravity and reinforced design contribute to safer lifting and stacking.

4. Offshore Reefer Containers

DNV offshore reefer containers provide temperature-controlled storage for food, pharmaceuticals, or temperature-sensitive chemicals. Key features:

• Integrated refrigeration unit
• Insulated walls, floor, and roof
• Internal lighting and safety features
• Compliance with DNV 2.7-1 and food safety guidelines

5. Offshore Chemical and Tank Containers

Special DNV tank containers are designed for liquids, fuels, and chemicals:

• Offshore chemical tanks for hazardous liquids
• IBC frame containers for intermediate bulk containers
• Acid and caustic tanks with specific linings and material selection

These units are engineered to meet IMDG Code, ADR, and DNV offshore requirements for hazardous cargo.

Design and Construction Features of DNV Offshore Containers

High-Strength Structural Design

Every DNV offshore container is built with:

• High-grade structural steel capable of withstanding high impact energy
• Reinforced corner posts and base frames
• Engineered lifting points for direct crane hook or sling connection
• Structural analysis performed according to DNV 2.7-1 and finite element methods

This ensures that the container can withstand:

• Dynamic load factors during offshore lifting
• Impact loads from sea swell and vessel motion
• Rough handling during loading, unloading, and stacking

Lifting Sets and Rigging

The lifting set is an integral element of DNV offshore container design. Typically, this includes:

• Certified wire rope or chain slings
• Master link and shackles compliant with DNV and EN standards
• Correct sling angle and design factor for offshore lifting

Lifting sets are:

• Individually tested and certified
• Marked with WLL, serial number, and certification details
• Subject to regular inspection and re-certification

Protection Against Corrosion and Harsh Environments

DNV offshore containers are exposed to aggressive marine conditions. Therefore, they receive:

• Grit-blasting to the appropriate surface preparation grade
• High-performance marine coatings or paint systems
• Optional hot-dip galvanisation of structural elements
• Use of stainless steel components where necessary

These measures extend the service life and reduce maintenance costs over the years of offshore operation.

Inspection, Maintenance, and Re-Certification

Initial and Periodic Inspections

To maintain DNV compliance, offshore containers must undergo:

• Initial inspection after manufacturing and before being put into service
• Periodic inspections (typically annually)
• Thorough examinations at prescribed intervals, e.g., every 5 years

Inspections verify:

• Structural integrity (no cracks, permanent deformation, or severe corrosion)
• Condition of lifting sets, shackles, and pad eyes
• Legibility of identification plates and markings
• Functionality of doors, locks, hinges, and safety features

Non-Destructive Testing (NDT)

Critical welds and structural nodes may require NDT methods such as:

• Visual testing (VT)
• Magnetic particle testing (MT)
• Ultrasonic testing (UT)

These procedures help detect hidden defects that could compromise safety.

Documentation and Traceability

Every DNV offshore container is backed by a complete documentation package, including:

• Design calculations and drawings
• Material certificates
• Welding procedure and welder qualifications
• Factory acceptance test reports
• DNV certificates and inspection reports

Proper documentation ensures traceability, simplifies audits, and supports regulatory compliance.

How to Select the Right DNV Offshore Container

When selecting a DNV 2.7-1 offshore container for your project, several critical parameters must be evaluated:

1. Cargo Type and Hazard Classification

Define:

• Type of cargo – tools, equipment, chemicals, food, consumables, etc.
• Hazard classification – e.g., dangerous goods, flammable liquids, corrosives
• Temperature requirements – ambient, chilled, or frozen

This determines whether you require a standard CCU, chemical tank, reefer, or specialised module.

2. Payload and Volume Requirements

Consider:

• Payload (kg or tonnes) – the maximum weight of cargo
• Internal volume and dimensional constraints
• Stacking and storage space offshore

Selecting the correct WLL and tare weight balance is essential for optimising crane usage and deck planning.

3. Operational Environment

Assess the environmental conditions:

• Open sea vs. nearshore operations
• Low or high temperature climates
• Aggressive corrosion exposure

This impacts material selection, coating system, and sealing requirements.

4. Handling and Logistics

Evaluate how the offshore container will be:

• Loaded and unloaded (forklift, crane, side-lift, etc.)
• Transported (supply vessel, barge, truck, or multi-modal)
• Integrated into your logistics and inventory systems

Features such as fork pockets, lifting eyes, stacking guides, and tie-down points must be tailored to your handling procedures.

Advantages of DNV-Certified Offshore Containers

Choosing DNV offshore containers provides significant benefits to operators, contractors, and logistics providers:

• Enhanced Safety – Strict compliance with DNV 2.7-1 reduces the risk of structural failure or lifting accidents.
• Regulatory Compliance – Accepted by major oil & gas, marine, and offshore wind operators worldwide.
• Operational Reliability – Engineered for long service life, high usage rates, and harsh conditions.
• Lower Total Cost of Ownership – Reduced downtime, fewer failures, and lower maintenance over time.
• Global Acceptance – DNV certificates are recognised internationally, simplifying cross-border operations.

Custom-Engineered DNV Offshore Containers

Standard units may not always meet specialised project requirements. We support custom-engineered DNV offshore containers, including:

• Special tool containers with racks, shelves, and workbenches
• Offshore workshop and office modules
• Bespoke tank containers for specific chemicals or process fluids
• Equipment skids and frames certified under DNV 2.7-1 / 2.7-3

Our engineering team collaborates with project stakeholders to:

• Define functional and safety requirements
• Develop 3D models and structural analyses
• Coordinate DNV design approval and certification
• Deliver fully tested and documented containers ready for offshore deployment

Best Practices for Safe Use of DNV Offshore Containers

To maximise safety and container life:

• Never exceed the rated WLL marked on the container and lifting set.
• Ensure cargo is evenly distributed and properly secured using internal lashing points.
• Inspect slings, shackles, and hooks before each lift; remove damaged items from service immediately.
• Keep doors securely closed and locked during lifting and sea transport.
• Conduct regular visual inspections and schedule mandatory DNV re-certification on time.
• Train personnel in offshore lifting procedures and hazard awareness.

Conclusion – Reliable, Compliant, and Safe DNV Offshore Containers

DNV offshore containers are fundamental to safe and effective offshore logistics. By adhering to DNV 2.7-1 and related standards, these containers provide:

• Robust structural integrity
• Proven lifting safety
• Long-term resistance to corrosive marine environments
• Full traceability and certification

Whether your operations involve oil and gas platforms, offshore wind farms, subsea construction, or marine logistics, investing in DNV-certified offshore containers ensures that equipment and materials are transported with maximum safety, compliance, and reliability.

If you carefully align cargo type, payload, environment, and handling requirements with the appropriate DNV offshore container design, you will achieve optimised offshore logistics performance and reduce operational risk across the entire supply chain.