Short Answer
Before requesting an offshore workshop-container quotation, define the work to be performed inside, the equipment and storage required, the installation environment, applicable certification, utility interfaces, safety systems, transport limits and required documentation.
The most effective enquiries do not begin with “Please quote a 20ft workshop container.” They explain the operating task, because that task determines the layout, floor loading, HVAC, power, lifting, fire protection and certification package.
What Is an Offshore Workshop Container?
An offshore workshop container is a transportable, purpose-built workspace for maintenance, repair, inspection or specialist support work on an offshore installation, vessel or marine project. It may contain workbenches, vices, shelving, tool storage, lifting aids, electrical outlets, compressed-air connections, HVAC, lighting and safety equipment.
Depending on the project, the unit can be engineered as an offshore container to DNV 2.7-1 and EN 12079 requirements, a fire-rated module, or a hazardous-area-compatible workspace. Those scopes must be specified rather than presumed.
Start With the Work Scope
Describe the actual workshop activity: mechanical repair, electrical maintenance, hydraulic work, calibration, welding preparation, ROV support, rigging, instrument repair or another task. Then identify whether it involves sparks, hot work, chemicals, lifting, compressed gas, batteries or oil.
This information drives practical decisions such as:
- bench dimensions and vice locations;
- storage for tools, spares and consumables;
- floor load capacity and tie-down points;
- extraction, ventilation and filtration;
- electrical outlet ratings and distribution;
- fire detection, suppression and emergency isolation; and
- hazardous-area controls or segregation.
The Quotation Checklist
1. Layout, dimensions and access
Provide a preferred size or footprint, but also supply the required working area, equipment list and access limitations. Define door positions, personnel access, equipment-loading routes, crane or forklift handling constraints and clearances around workstations.
2. Equipment, payload and floor loads
List all supplied or customer-furnished equipment with its weight, footprint, heat output and fixing arrangement. Include heaviest lift, stored-spares weight, point loads, dynamic loads and any internal lifting beam, hoist or crane requirement.
3. Offshore structure and lifting
State whether the workshop will be transported or lifted offshore, and identify required standards such as DNV 2.7-1 and EN 12079. Provide maximum gross mass, lifting method, deck installation details, sea fastening, stacking restrictions and any client or class requirements.
4. Environmental conditions and corrosion protection
Define the installation region, minimum and maximum ambient temperatures, humidity, salt spray, wind, solar load and corrosivity requirements. These inputs affect coating selection, insulation, HVAC sizing, weather seals and the selection of external equipment.
5. Electrical and utility interfaces
Specify incoming voltage, frequency, available power, fault level, earthing arrangement, plug or gland type, lighting requirements and socket standards. State whether the workshop needs compressed air, water, drainage, network, telephone, welding power or other utilities.
6. HVAC and ventilation
Identify occupancy, equipment heat loads, required internal conditions and any contaminant source. A workshop that uses solvents, battery charging or process chemicals may need local extraction or an engineered ventilation arrangement in addition to general cooling.
7. Fire and hazardous-area requirements
Provide the hazardous-area classification, fire rating, detection requirements, gas hazards and host-system interfaces. Hot-work activities or flammable materials can change the required safety concept. A standard workshop layout should not be used for a hazardous location without an appropriate engineering review.
8. Documents, inspection and delivery
Specify required drawings, calculations, material certificates, inspection and test plan, load-test records, NDT reports, coating reports, certificates, FAT attendance, packing requirements and delivery port or site.
Frequently Asked Questions
Is a workshop container just an equipment container with benches?
No. A functional workshop must safely support the specific work, personnel, tools and utilities involved. The correct design considers workspace, storage, loads, maintenance, ventilation, electrical safety, fire risk and installation interfaces as an integrated package.
Can a workshop container be installed in a hazardous area?
Possibly, but the hazardous-area classification and work activities must be assessed first. The final solution may require pressurisation, Ex-rated equipment, gas detection, extraction, fire protection, operating restrictions or a different installation location.
Should I request A-60 fire protection?
Only when the project fire-safety plan or client specification requires it. If needed, the required fire-rated boundary and all relevant doors, penetrations, ventilation dampers and interfaces must be defined.
What is the fastest way to receive an accurate quotation?
Send a simple equipment list, preferred layout, certification requirements, utility schedule, target delivery date and installation details. Even a marked-up sketch and photographs of similar equipment can significantly improve the initial technical review.
Turn an Enquiry Into a Buildable Module
TLS designs and manufactures offshore workshop, laboratory, crane, rigging-loft and equipment containers to customer requirements. Depending on project scope, workshops can include insulated and air-conditioned workspaces, workbenches and storage, electrical and utility interfaces, fire-and-gas systems and offshore certification. Contact TLS with your work scope and specification to begin a technical review.
Further Reading
· TLS workshop and laboratory containers
· TLS containerised solutions overview
Short Answer
An ISO shipping container is designed mainly for intermodal freight transport. A DNV 2.7-1 offshore container is designed, built, tested and certified for repeated offshore lifting and handling between vessels and offshore installations. They can look similar, but they are not interchangeable.
For an offshore project, the question is not simply whether a container is strong enough to carry equipment. It is whether the complete unit—including its structure, lifting set, weld quality, markings, tests and documentation—meets the project’s offshore transport and lifting requirements.
What Is an ISO Shipping Container?
An ISO freight container is a standardized cargo unit used in road, rail and sea logistics. Its dimensions and corner fittings support global intermodal handling. A container carrying a CSC safety plate can be suitable for international transport under the International Convention for Safe Containers, subject to its condition and operating limits.
That does not make it an offshore lifting container. Offshore lifts can introduce dynamic effects, vessel motion, acceleration, impact and demanding corrosion exposure that are outside the normal design basis of a freight container.
What Is a DNV 2.7-1 Offshore Container?
DNV-ST-E271, commonly called DNV 2.7-1, is a standard for offshore containers and their lifting sets. It covers the approval and certification framework for design, manufacture, testing, marking, inspection and certification. EN 12079 is also widely specified for offshore-container applications.
A DNV 2.7-1 container may be a cargo-carrying unit, equipment container, workshop, laboratory, control-room module or another project-specific enclosure. The certification scope must be confirmed for the exact design and supplied configuration.
Why Offshore Lifting Changes the Design
The movement of a supply vessel relative to an offshore platform or rig can create dynamic loading during lifting. The container, lifting points and slings must therefore be assessed as a system for the intended offshore service.
An offshore container specification commonly considers:
- structural framing, floors, doors, roof and equipment supports;
- pad eyes, lifting sets and their certification;
- lifting, impact and transport load cases;
- welding procedures, material traceability and inspection;
- corrosion protection for the operating environment;
- load testing, non-destructive testing and final inspection; and
- required marking, certificates and documentation.
The required details vary with the container type, payload, dimensions, lifting arrangement, project location and client specification.
Is a CSC Plate the Same as DNV 2.7-1 Certification?
No. A CSC plate is associated with the safety approval of a freight container for international transport. DNV 2.7-1 certification addresses offshore-container and lifting-set requirements. One approval does not automatically replace the other.
Some projects require both an offshore certification package and a CSC transport configuration. Buyers should state this explicitly rather than assuming that a freight certificate covers offshore use.
What Does DNV 2.7-1 Not Cover by Itself?
DNV 2.7-1 is vital for offshore structure and handling, but it is not a blanket approval for every system inside the module.
For example:
- A-60 fire protection concerns the performance of a specified fire-rated boundary.
- IEC 60079, ATEX or IECEx requirements concern equipment and installations in potentially explosive atmospheres.
- Electrical protection, HVAC capacity, fire-and-gas systems and process equipment each require their own defined design and approval basis.
An offshore workshop or pressurised control room may need several coordinated compliance scopes. A technically credible quotation identifies each scope separately.
Which Container Should You Specify?
Specify an ISO freight container when the unit is intended for standard intermodal logistics and the project does not require offshore lifting certification.
Specify a DNV 2.7-1 offshore container when the unit will be lifted to or from an offshore installation, handled by offshore lifting equipment, or is required by the operator, classification society or project specification.
If the unit is a functional module, define its application as well: workshop, laboratory, MCC shelter, accommodation, refrigeration, ROV control or another purpose. The function determines the internal layout, utilities, safety systems and documentation required in addition to the offshore structure.
Questions Buyers Commonly Ask
Can a standard shipping container be converted for offshore use?
Not by adding pad eyes or repainting it. Offshore suitability must be evaluated against the applicable standard and certification process for the complete converted unit. The responsible manufacturer and certification body must confirm what is feasible.
Does every offshore container need A-60 fire protection?
No. Fire rating depends on the module’s function, location and project fire-safety requirements. It must be specified for the relevant boundaries and penetrations when required.
Are DNV 2.7-1 and EN 12079 identical?
They are both commonly referenced for offshore containers, but the project must state the applicable revision, certification basis and any client or class requirements. Do not rely on a generic statement that a unit is “offshore compliant.”
What documents should accompany an offshore container?
The required dossier is project-specific. It may include drawings, certificates, material traceability, load-test records, NDT reports, lifting-set certificates, inspection records, coating documentation, operating instructions and marking details.
What to Include in an Enquiry
Provide the intended service, payload and internal equipment; offshore installation location; required standards; maximum dimensions and weight; lifting arrangement; corrosion environment; fire or hazardous-area requirements; utility interfaces; target quantity; delivery location; and required documents or third-party inspection.
TLS designs standard and custom containerised solutions for offshore, energy, industrial and data-infrastructure projects. Its offshore container solutions can be engineered to project requirements including DNV 2.7-1 and EN 12079. Contact TLS with your application and specification for a project-specific review.
Further Reading
· DNV ST-E271 offshore-container standard overview
· TLS offshore container certification information
Short Answer
To specify a pressurised container, first define the hazardous-area classification and the intended function of the module. Then provide the external hazards, internal equipment, ventilation and pressurisation philosophy, fire-and-gas requirements, utilities, environmental conditions and certification basis.
“Zone 1/Zone 2 container” is not a complete technical specification. The zone, gas group, temperature class, equipment-protection requirements and operating philosophy must be established for the exact installation.
What Is a Pressurised Container?
A pressurised container is an enclosed module supplied with clean air so that its internal pressure is maintained above the surrounding atmosphere. This controlled outward airflow helps prevent a potentially hazardous external gas or vapour atmosphere from entering the protected space.
Typical uses include control rooms, MCC and switchgear shelters, VFD cabins, laboratories, mud logging cabins and instrumentation modules located near offshore or onshore process hazards.
The container structure, HVAC, fresh-air intake, pressure controls, alarms, shutdown logic, fire-and-gas system and cable penetrations must work as one engineered system.
What Is the Difference Between Zone 1 and Zone 2?
In gas hazardous-area classification, Zone 1 is an area in which an explosive gas atmosphere is likely to occur in normal operation. Zone 2 is an area in which it is not likely to occur in normal operation and, if it does occur, will exist only for a short period.
The classification is assigned by the project’s hazardous-area study. A container supplier should not guess the zone from a general description such as “near the process area.” The client should provide the hazardous-area drawing, relevant release information and applicable standards.
What Information Must Be Defined Before Design Starts?
1. Module function and internal equipment
State whether the module is a control room, electrical shelter, laboratory, workshop or another application. Include equipment dimensions, weights, heat dissipation, maintenance clearances and cable routes. The enclosure protects and supports the equipment; it does not eliminate the need to engineer the equipment itself.
2. Hazardous-area basis
Provide the zone, gas group, temperature class, equipment-protection level where applicable, hazardous-area drawings and client standards. Also identify external hazards such as flammable gas, hydrogen sulphide, dust, blast, salt exposure and extreme temperatures.
3. Pressurisation and purge philosophy
Define the safe-air source, intake location, duct routing, purge sequence, required operating pressure, door-opening conditions, alarm thresholds and response to loss of pressure. A typical system verifies air availability, purges before energising protected equipment, monitors pressure continuously and initiates alarms or defined shutdown actions when the protective condition is lost.
The exact sequence, set points and delays must be established by the responsible hazardous-area engineering and certification parties.
4. Ventilation, cooling and extraction
HVAC capacity must cover people, internal equipment, solar load and the project design ambient. If the module contains a fume hood, process exhaust or battery off-gas source, the supply and exhaust system must be designed together. Extraction can reduce internal pressure; pressurisation alone does not control a hazardous release created inside the module.
5. Fire, gas and emergency functions
Specify smoke, fire, flammable-gas and toxic-gas detection where required; fire suppression or host-system interfaces; emergency stop; emergency lighting; alarms; and evacuation arrangements. If an A-0 or A-60 boundary is required, identify the fire-rated walls, roof, floor, doors, dampers and penetrations that form that boundary.
6. Structural and transport requirements
For offshore service, define whether DNV 2.7-1 and EN 12079 are required, along with payload, lifting set, deck loads, sea fastening, transport limits and certification documentation. Hazardous-area compliance and offshore structural certification address different risks, so both scopes must be stated when needed.
Frequently Asked Questions
Does positive pressure make all internal equipment safe for a hazardous area?
No. Pressurisation can be part of the protection concept, but the entire system—including purge, pressure monitoring, alarms, shutdown, maintenance and failure conditions—must be designed and verified for its intended duty.
Can a pressurised container safely handle gas or chemicals released inside?
Not by pressure alone. Internal releases may require local extraction, gas detection, ventilation, suitable electrical equipment, emergency shutdown and process-specific controls. The risk assessment must distinguish external from internal hazards.
Is an A-60 container automatically suitable for Zone 1?
No. A fire rating and a hazardous-area protection concept are separate requirements. A module can need both, but one does not certify the other.
What should be included in the quotation request?
Include the application, installation location, zone classification, drawings, internal equipment data, utility details, environmental conditions, certification requirements, requested safety systems, dimensions, target delivery location and documentation requirements.
Build the Specification Around the Application
TLS supplies custom pressurised containers for offshore and onshore applications, including control rooms, electrical shelters and specialised process-support modules. Depending on the agreed project scope, systems can incorporate pressurisation controls, HVAC, fire-and-gas detection, passive fire protection and offshore structural certification. Send TLS your technical requirements for a project-specific solution.
