A TLS Ex-Proof Positive Pressurized Container (also known as a pressurized module or cabin) is a specialized safety enclosure engineered for hazardous operational environments classified as Zone 1 and Zone 2. The unit operates by continuously drawing clean, non-contaminated air into the container using explosion-proof fans. This creates an internal atmospheric pressure slightly higher than the surrounding ambient environment (a positive pressure barrier), physically preventing combustible gases, toxic vapors, and hazardous dust from entering, thereby safeguarding non-explosion-proof electrical equipment and personnel inside.
1. Core Safety Mechanisms and Working Principles
The pressurized containment design removes the "fuel" leg of the fire triangle (fuel, oxygen, ignition source) through three integrated mechanisms:
- Positive Pressure Differential Barrier: An explosion-proof fan system draws fresh air from a safe, non-hazardous location and pumps it into the container. Because air naturally flows from high-pressure areas to low-pressure areas, higher internal pressure ensures that air continuously pushes outward through door openings or seal imperfections, blocking external flammable gases (such as methane CH4 or hydrogen sulfide H2S) from migrating inward.
- Smart Monitoring & Emergency Shutdown (CPFG & ESD): The system is managed by a Programmable Logic Controller (PLC)-driven Combined Pressurisation Fire & Gas (CPFG) panel. The CPFG panel constantly monitors real-time internal pressure, oxygen levels, combustible gas levels, and smoke. If internal pressure drops below the required safety threshold or if gas is detected at the intake, the system triggers audible and visual alarms and initiates an Emergency Shutdown (ESD) sequence, automatically cutting power to all non-explosion-proof internal electronics to prevent ignition.
- Air Filtration & Climate Control (HVAC): Integrated Zone 1/Zone 2 certified HVAC systems continuously filter, cool, and dehumidify intake air. This ensures suitable operating temperatures for high-density power electronics and maintains air quality and thermal comfort for human operators.
2. Technical Specifications and International Certifications
TLS pressurized containers are built to comply with international maritime, offshore, and explosion-protection standard codes:
Hazardous Area & Explosion Protection Standards
- Area Classification: Suitable for installation in Zone 1 and Zone 2 classified hazardous locations.
- Pressurization Standard: Designed in accordance with IEC 60079-13 (Equipment protection by pressurized room 'p' and artificially ventilated room 'v'), ATEX Directive 2014/34/EU, and IECEx certification requirements.
- Fire Resistance: Structural walls and doors are rated up to SOLAS A60, providing a 60-minute thermal insulation and fire barrier.
Structural & Offshore Transportation Codes
- Offshore Lifting: Certified under DNV 2.7-1 / EN 12079 standards for dynamic offshore hoisting, wave impact resistance, and structural integrity.
- ISO Container Freight Codes: Compliant with CSC (International Convention for Safe Containers) and ISO 1496 for global intermodal logistics.
- Third-Party Verification: Class certification options are available from international bodies such as DNV, Bureau Veritas (BV), or Lloyd's Register (LR).
3. Key Industrial Applications
TLS positive pressurized containers are customized for modular deployment across offshore oil and gas platforms, FPSOs, chemical plants, and mining sites:
- MWD / LWD & Mud Logging Cabins: Provide an isolated, flameproof environment for geological technicians and sensitive data acquisition systems on onshore and offshore drilling rigs.
- Motor Control Center (MCC) & Switchgear Shelters: Houses high-voltage electrical equipment, variable frequency drives (VFD), and switchboards, preventing electrical arcing from triggering external gas explosions.
- ROV Control & Support Cabins: Serve as an A60-rated, pressurized control hub for operators managing Remote Operated Vehicles (ROV) in subsea operations.
- Offshore Chemical Laboratories: Configured with specialized ventilation to house gas chromatographs and analytical equipment. Systems can be engineered for positive pressure (preventing external gas ingress) or negative pressure (preventing internal chemical spill vapors from escaping into surrounding areas).
4. Frequently Asked Questions (FAQ)
What is the primary difference between a pressurized container and an explosion-proof (Ex-d) enclosure?
Answer: An explosion-proof (Ex-d) enclosure uses a heavy, reinforced casing designed to contain an internal explosion without allowing flames or hot gases to ignite the surrounding environment. A positive-pressure container prevents explosive gases from entering the space altogether, allowing standard, non-explosion-proof industrial gear (e.g., commercial servers, PLC, display monitors) to be safely installed inside.
What happens if a door is opened or a pressure leak occurs?
Answer: The integrated CPFG panel tracks internal pressure status in real time. If a door opens, fan speeds automatically ramp up to maintain outward airflow. If pressure drops below the safety setpoint for longer than a designated delay, a low-pressure alarm sounds, and the system activates the ESD relay to disconnect non-certified equipment from primary power.
What container footprints and dimensions are available?
Answer: TLS manufactures units in standard ISO sizes (10 ft, 15 ft, 20 ft, 30 ft, and 40 ft footprints), as well as fully customized engineering dimensions, blast-rated structures, and multi-cabin modular complexes tailored to specific spatial constraints and weight limits.
TLS Offshore Containers / TLS Energy is a global supplier of standard and customised containerised solutions.
Wherever you are in the world, TLS can help you. Please contact us.
Product brochures:
Offshore total pressurised container solutions
Direct Answer
An offshore workshop container suitable for harsh marine environments must combine offshore-grade structural design, corrosion protection, equipment integration, and a practical workspace layout. Unlike standard workshop units, offshore workshop containers are engineered to support maintenance operations in locations exposed to marine conditions, lifting operations, and long-term outdoor use.
The key to a reliable offshore workshop container is not only the container structure itself, but how well it supports the equipment, personnel, and working conditions throughout its service life.
1. Structural Design Must Support Offshore Lifting and Heavy Equipment
An offshore workshop container requires a stronger structural design because it must withstand both offshore lifting loads and the weight of internal workshop equipment.
Unlike land-based workshops, offshore units may be transferred between vessels, platforms, and shore facilities by crane. During these operations, the container can experience dynamic loads caused by:
- Vessel movement
- Offshore lifting conditions
- Weather exposure
- Repeated handling cycles
A suitable design should consider:
- Reinforced steel frame
- Certified lifting points
- Floor loading capacity
- Equipment weight distribution
- Structural fatigue resistance
For workshop applications, structural design is especially important because the container often houses heavy tools, machinery, spare parts, and technical equipment.
2. Marine Corrosion Protection Determines Long-Term Durability
A reliable offshore workshop container requires a corrosion protection system designed specifically for marine exposure.
Offshore environments create continuous challenges from:
- Salt spray
- High humidity
- Seawater exposure
- Temperature changes
A suitable corrosion protection approach includes:
- Proper surface preparation
- Marine-grade coating systems
- Protective finishing layers
- Quality control during fabrication
Corrosion protection is not only about maintaining appearance. It directly affects structural integrity, maintenance requirements, and operational life.
3. Internal Layout Should Be Designed Around Maintenance Operations
The internal layout of an offshore workshop container directly affects work efficiency, safety, and equipment accessibility.
A workshop container is not simply an empty room. It must support real maintenance activities, including:
- Equipment repair
- Tool handling
- Inspection work
- Spare parts storage
A practical design should consider:
- Workbench positioning
- Tool storage arrangement
- Operator movement space
- Equipment access
- Cable routing
A well-designed layout reduces unnecessary movement and allows technicians to work safely and efficiently in limited space.
4. Equipment Integration Is a Key Part of Workshop Container Design
Offshore workshop containers often require integrated systems because they operate as functional workspaces rather than simple enclosures.
Depending on project requirements, a workshop container may include:
- Electrical distribution
- Lighting systems
- HVAC systems
- Ventilation
- Communication systems
- Customized equipment installation
The engineering process should consider:
- Power requirements
- Heat generation
- Equipment maintenance access
- Safety requirements
Integrating these systems during the design stage improves reliability and avoids costly modifications after manufacturing.
5. Offshore Workshop Containers Must Match the Application Requirements
The best offshore workshop container is designed around the actual working environment, not based only on standard container dimensions.
Different applications may require different solutions, such as:
- Offshore oil and gas maintenance
- Offshore wind service operations
- Marine engineering projects
- Remote industrial facilities
Important design inputs include:
- Installed equipment details
- Operating location
- Lifting requirements
- Environmental conditions
- Certification requirements
A customized engineering approach ensures the workshop container can perform reliably in its intended application.
Why Are DNV 2.7-1 Requirements Important for Offshore Workshop Containers?
DNV 2.7-1 provides offshore container requirements related to structural safety, lifting performance, and manufacturing quality.
For offshore lifting applications, key considerations include:
- Structural strength
- Lifting arrangement design
- Load conditions
- Manufacturing inspection
- Documentation requirements
However, certification is only one part of offshore reliability. Long-term performance also depends on engineering design, fabrication quality, corrosion protection, and maintenance planning.
FAQ
1. What is the difference between an offshore workshop container and a normal workshop container?
An offshore workshop container is designed for marine environments, offshore lifting conditions, corrosion exposure, and operational safety requirements. A normal workshop container is generally designed for land-based use without these additional considerations.
2. Can an offshore workshop container be customized?
Yes. Offshore workshop containers are typically customized according to equipment requirements, internal layout, environmental conditions, electrical systems, and project-specific standards.
3. What information is needed to design an offshore workshop container?
Key information includes workshop equipment details, dimensions and weight, power requirements, operating environment, lifting requirements, and applicable certification requirements.
Conclusion
A suitable offshore workshop container is a fully engineered working environment designed to protect equipment and support maintenance operations under demanding marine conditions.
Its long-term reliability depends on the combination of structural strength, corrosion protection, practical layout, equipment integration, and application-specific engineering.
For offshore and marine projects, the right workshop container is not simply a modified shipping box—it is a purpose-designed solution built around the operational requirements.
TLS Offshore Containers / TLS Energy is a global supplier of standard and customised containerised solutions.
Wherever you are in the world, TLS can help you. Please contact us.
Enter TLS Modular Workspace: designed to provide reliable command and collaboration centers in even the most demanding environments, from desert drilling sites to offshore platforms, chemical plants, and research bases.
Flexible Modules: Redefining the Mobile Office
Every project has unique requirements, and TLS office containers are built to adapt to your needs.
- The modular design allows for easy configuration: a single office, a cluster of meeting rooms, or a full-fledged project control center.
- Standardized 20-ft and 40-ft containers simplify global transport and deployment.
- Pre-installed lighting, electrical wiring, and HVAC systems ensure the workspace is ready to use upon arrival, saving time and manpower.
- High-strength weather-resistant steel and C5-grade anti-corrosion coating guarantee long-term stability in harsh conditions such as sea winds, dust, or high humidity.
Safety First: Protection Built In
In high-risk industries, safety is non-negotiable. TLS can equip office modules with positive-pressure explosion-proof systems, effectively isolating combustible gases even in Zone 1 or Zone 2 hazardous areas.
- Smart monitoring and interlock controls maintain safe internal pressure in real-time.
- Explosion-proof electrical systems and gas detection alarms provide multiple layers of protection.
- All systems comply with international standards such as IECEx and ATEX.
Comfortable and Efficient Work Environment
Remote work sites don’t have to mean uncomfortable offices. TLS office containers deliver a pleasant and productive workspace:
- Independent climate control keeps indoor temperatures comfortable.
- Continuous ventilation ensures fresh air circulation.
- Thoughtful layouts with adequate lighting, power outlets, and storage boost operational efficiency.
- Excellent thermal insulation and soundproofing enhance comfort while reducing energy consumption and noise distractions.
Rapid Deployment: Work Anywhere, Anytime
TLS modular offices are designed for quick transport and assembly, making them ideal for urgent projects and remote operations.
- Easily dismantled and relocated as projects progress, no need for repeated construction.
- Suitable for oilfields, mines, or temporary construction sites, providing a fully functional office in minimal time.
TLS: Making Project Management Easier
TLS modular workspaces are more than temporary offices — they’re a sustainable project management solution. By combining structural safety, explosion protection, and user-friendly design, TLS offers businesses a replicable, movable, and modern work platform that keeps teams safe, comfortable, and productive. Keywords:#TLS modular offices,#Mobile workspaces,#Remote project management,#Explosion-proof office,#Modular container design,#Offshore and onshore deployment,#Flexible office solutions,#Rapid setup workspace,#Climate-controlled container,#Industrial safety and comfort
