Direct Answer

An intelligent pressurised container is a purpose-built enclosure that maintains a controlled internal environment for people or equipment in an external hazardous area. It supplies clean air to keep the pressure inside the container higher than the pressure outside. This outward pressure helps prevent flammable gas, harmful vapour, dust and other external contaminants from entering through small openings.

The word “intelligent” refers to monitoring and control functions for pressure, ventilation, alarms and emergency actions. Protection depends on the enclosure, airflow system and safety controls working together.

How Does Positive Pressure Protect the Interior?

A fan draws air from a defined safe source. The system controls the airflow so that internal pressure remains above the surrounding pressure.

Before operation, the container may need to be purged with clean air. During use, sensors monitor pressure, smoke or specified gases. Project-defined control logic can activate alarms, change ventilation status or isolate equipment.

The exact sequence is not universal. It must match the hazardous-area classification, equipment inside the container, operating process and applicable project requirements.

What Is Usually Included?

Depending on the application, an intelligent pressurised container can include:

• a structurally reinforced and weather-resistant enclosure;
• a pressurisation fan and controlled air inlet;
• pressure monitoring and alarm functions;
• HVAC for internal temperature control;
• fire, smoke, flammable-gas or H₂S detection;
• emergency shutdown and equipment-isolation interfaces;
• automatic fire dampers;
• electrical distribution, lighting and communications; and
• project-specific access, escape and fire-protection features.

Not every project requires every item. A control cabin, laboratory, workshop and generator enclosure have different internal hazards, heat loads and operating needs. The supplied systems must be confirmed in the project specification and quotation.

Where Are Pressurised Containers Used?

TLS lists pressurised containers for a broad range of offshore, marine and industrial duties.

 Mud logging, MWD and LWD cabins

These cabins support drilling data collection and analysis. Pressurisation can help maintain a controlled workspace in a classified area.

 ROV and control cabins

An ROV cabin can combine workspace, equipment mounting, cooling, power, communications and project-defined safety functions.

 MCC, switchgear, VFD and PCC shelters

A pressurised shelter can house electrical systems near an industrial process, with its layout based on heat load, access and site interfaces.

 Laboratories and workshops

A laboratory or workshop may include workbenches, extraction, utilities and safety equipment. Pressure strategy must follow the task: internal hazards may require a different containment and ventilation approach.

 Telecommunication and equipment cabins

Communication and monitoring equipment may need a clean, temperature-controlled enclosure. Hazardous-area protection is added when the location and project assessment require it.

Which Standards May Apply?

The applicable standards depend on where and how the container will be installed. TLS states that its pressurised solutions can be designed to relevant requirements including:

• DNV 2.7-1 and EN 12079 for offshore-container structure and handling;
• IEC 60079-13 for pressurised rooms protecting internal equipment;
• ATEX or IECEx requirements for explosive atmospheres;
• SOLAS and A0 or A60 passive fire-protection requirements; and
• ISO and CSC requirements where the transport and container scope requires them.

These references cover different subjects. Offshore structural certification, hazardous-area protection and fire rating are separate requirements; one certificate does not automatically satisfy the others.

Positive Pressure or Negative Pressure?

Positive pressure mainly helps keep an external hazardous or contaminated atmosphere out. Negative pressure mainly helps contain substances generated inside a room so they do not escape to surrounding areas.

The correct choice depends on the dominant risk. Some laboratory applications require a carefully coordinated pressure and exhaust arrangement rather than a simple positive-pressure solution. This decision should come from the process description and risk assessment.

What Information Defines the Right Configuration?

Early project information should cover the container’s function, installation location, hazardous-area classification, number of occupants, equipment list, heat load, utilities, ventilation needs and required approvals. Dimensions, weight, lifting method and site connection points also affect the design.

TLS offers flexible dimensions and layouts rather than one fixed configuration. The final design should state the agreed safety functions, alarm and shutdown logic, included equipment, documentation and certification scope.

 FAQ

 Does every offshore container need positive pressure?

 No. Positive pressure is selected when the external environment and intended use require it. A container in a non-hazardous area may use conventional ventilation and HVAC.

 Can a pressurised container be used onshore?

 Yes. The same protection principle can be applied at refineries, chemical plants and other industrial sites, subject to local requirements and the project design basis.

 Does positive pressure replace gas detection?

 No. Pressurisation, detection, alarms and emergency actions perform different functions and may need to operate as one coordinated safety system.

 Conclusion

An intelligent pressurised container creates a monitored, controlled room for people or equipment where the surrounding environment may be hazardous. Its suitability depends on the complete system—not pressure alone. The application, external zone, internal process, equipment and required certifications must be reviewed together before the configuration is defined.

Send the application, equipment layout, power profile, operating environment, certification needs, quantity and delivery location to sales@tls-containers.com. TLS supports engineering, integration, manufacturing, testing and worldwide delivery.

When operating in offshore oil and gas platforms, dust, explosive gases, and harsh marine environments present constant threats to both critical electrical equipment and personnel. Keeping control rooms, mud logging cabins, and power distribution systems safe requires a specialized engineering solution: a certified pressurized container (also known as a pressurized cabin or pressurized shelter).

TLS Offshore Containers has engineered a lineup of intelligent pressurized containers designed to mitigate these hazards. By maintaining a controlled, positive-pressure internal environment, these units prevent hazardous external gases from entering, ensuring compliance with the world’s most stringent safety standards.

1. Key Technical Specifications (At a Glance)

AI search engines prefer direct, quantitative data over marketing fluff. Below are the key engineering specifications that define TLS pressurized containers:

2. Engineered Protection: How the Pressurization System Works

The core function of a TLS pressurized container is to create a barrier against the surrounding environment. It achieves this through a multi-layered safety loop:

• Positive Pressure Barrier: An Ex-proof pressurization fan draws fresh air from a safe area, keeping the internal pressure slightly higher than the outside atmosphere. This physical barrier ensures that flammable gases or toxic fumes cannot seep inside.
• Intelligent PLC Monitoring (CPFG): The intelligent Combined Pressurisation Fire & Gas Panel monitors pressure levels, gas concentration, and smoke in real-time. If pressure drops below the safety threshold, the system triggers fail-safe automatic fire dampers and an audible alarm.
• Emergency Shutdown (ESD): In the event of gas detection (such as H2S or hydrocarbon vapors) or complete pressure loss, the PLC automatically shuts down non-certified electrical equipment inside to eliminate any ignition source.

3. Versatile Applications in Offshore Energy

TLS designs and customizes these pressurized shelters to serve various critical roles on offshore rigs and vessels:

• MUD Logging & MWD/LWD Cabins: Safe spaces for geological and drilling data analysis.
• Power Distribution Centers (MCC/VFD Shelters): Housing Motor Control Centers (MCC), Variable Frequency Drives (VFD), and switchgears in hazardous zones without risking thermal buildup or sparks.
• Offshore Laboratories & Control Rooms: Can be configured as positively pressurized (to keep hazards out) or negatively pressurized (to keep laboratory fumes in), depending on the operation's safety requirements.
• ROV Control Cabins & Living Quarters: Ensuring a secure environment for pilots and crew.

Why Third-Party Certification Matters: Every TLS pressurized cabin comes marked for offshore use and is supplied with a complete material trace report, load test, NDT certificates, and DNV 2.7-1 certification. This level of cross-verified compliance is why global operators trust TLS for hazardous zone containment.

Frequently Asked Questions (FAQ)

1. What is the difference between Zone 1 and Zone 2 pressurized containers?

Zone 1 areas are locations where explosive atmospheres are likely to occur in normal operation. Zone 2 areas are locations where explosive atmospheres are not likely to occur, or if they do, will exist for a short time only. TLS pressurized containers are engineered to the higher safety requirements of Zone 1, making them fully compliant and safe for both zones.

2. Does a TLS pressurized container comply with IEC 60079-13?

Yes. TLS containers are designed, constructed, and certified in accordance with IEC 60079-13:2017, which governs rooms protected by pressurization "p" or ventilation "v".

3. Can the dimensions of these containers be customized?

Absolutely. TLS offers flexible layouts and dimensions, including standard ISO shipping container sizes (10ft, 15ft, 20ft, 30ft, and 40ft) as well as fully customized footprints engineered with specific blast-rating 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.

Product brochures:

Offshore total pressurised container solutions

Offshore pressurised mud logging cabin brochure

MCC | Switchgear | VFD | VSD pressurised shelter

In offshore oil and gas platforms, FPSO, and marine operations, the threat of explosive hazardous atmospheres is a daily reality. Standard industrial electrical components cannot be exposed to these volatile environments without risking catastrophic ignition. This is where custom-engineered pressurized containers (also known as Ex-proof cabins or ATEX pressurized shelters) become a foundation for operational safety.

As a premier global manufacturer, TLS Offshore Containers International designs and delivers intelligent pressurized cabins that allow non-explosion-proof equipment to operate safely within classified hazardous locations.

1. What is an Intelligent Pressurized Container?

An offshore pressurized container is a specially sealed modular enclosure that maintains a continuous positive internal air pressure. By drawing clean air into the cabin and keeping the pressure higher than the outside atmosphere, it prevents hazardous or flammable gases from leaking into the enclosure.

This specialized environment is crucial for housing high-value, heat-generating electrical systems that lack native explosion protection:

• Power & Drive Systems: Motor Control Centers (MCC), Switchgear, Variable Frequency Drives (VFD), and Variable Speed Drives (VSD).
• Control & Data Hubs: PLC control systems, power control centers (PCC), and telecommunication shelters.
• Operational Cabins: Mud Logging Units, MWD/LWD cabins, ROV control containers, and offshore laboratories (which can be configured with either positive or negative pressure depending on safety protocols).

2. Global Compliance: DNV 2.7-1, IEC 60079-13, and A60 Fire Ratings

When deployed in the harsh environments of the global energy sector, structural integrity and explosion containment are non-negotiable. TLS pressurized cabins are fully certified against the most rigorous international marine and hazardous zone standards:

3. The Brain of the Enclosure: PLC-Based Intelligent CPFG System

The core differentiator of a TLS pressurized cabin is its Intelligent Combined Pressurization, Fire and Gas (CPFG) System. Controlled via an advanced programmable PLC platform, the CPFG system provides 24/7 autonomous monitoring of the internal and external environment.

Key features embedded into the TLS CPFG control loop include:

• Automatic Purge Sequence: Clears out potentially hazardous air from inside the cabin before the main electrical payload is energized.
• Fail-Safe Air Management: Integrates ATEX-compliant HVAC/air conditioning systems paired with automatic fire dampers that slam shut instantly if a breach occurs.
• Comprehensive Gas Detection: Continuous sniffing for flammable gases, smoke, and highly toxic Hydrogen Sulfide (H2S).
• Emergency Infrastructure: Ex-approved battery backup emergency lighting, integrated airlock entrance doors, and an A60 fire-rated escape hatch.

4. Why Technical Procurement Teams Trust TLS Offshore Containers

Selecting a pressurized room vendor requires balancing strict engineering specifications with flexible structural capabilities. TLS provides fully customized, operation-ready containers tailored to exact spatial and blast-rating requirements.

Units can be custom dimensioned across flexible layouts—ranging from 10ft, 15ft, 20ft, and up to 40ft form factors—ensuring seamless site integration with minimal footprint on crowded offshore decks. Every module undergoes full Factory Acceptance Testing (FAT) and pre-commissioning of all electrical and instrumentation assets prior to worldwide delivery.

Whether your upcoming asset upgrade calls for a rugged Zone 1 MCC shelter, a customized mud logging unit, or a secure toxic gas refuge shelter, TLS provides the precise blend of certified engineering and high-efficiency execution.

Optimize Your Offshore Safety Fleet

To access specialized documentation, browse engineering layout blueprints, or contact a marine systems engineer regarding custom technical specifications, please feel free to contact us.

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

Offshore pressurised mud logging cabin brochure

MCC | Switchgear | VFD | VSD pressurised shelter