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In hazardous chemical environments where flammable gases and vapors are frequently present, the safe operation of electrical systems is not only essential for maintaining production efficiency—it is also critical for protecting personnel and assets.
Traditional flameproof (Ex d) solutions are increasingly challenged by their limitations in flexibility, maintenance, and installation costs. TLS, as a specialized manufacturer of functional containerized systems, provides high-safety, easy-to-integrate, and field-deployable pressurized explosion-proof (Ex p) solutions to support safety transformation and intelligent upgrades across the chemical, pharmaceutical, and energy sectors.

1. Why Pressurized Protection is Essential in Hazardous Chemical Zones

Chemical facilities typically include Zone 1 and Zone 2 areas, where explosive gas atmospheres may occur under normal or abnormal conditions. Electrical equipment operating in these areas—such as DCS units, PLC panels, communication devices, VFDs, and gas analyzers—can pose a serious ignition risk due to electrical arcs, sparks, or temperature rise.
With increasing automation and the centralization of equipment, conventional explosion-proof designs struggle to meet modern requirements, including:

• Centralized wiring and safe isolation for multiple devices
• Effective ventilation and heat dissipation in confined spaces
• Rapid equipment access and reliability during frequent maintenance

2. TLS Pressurized Enclosure Systems: Creating a Safe Space for Electrical Equipment

TLS offers integrated Ex p pressurization systems based on modular container platforms. By maintaining a stable positive pressure within the sealed enclosure, the system prevents flammable gases from entering and coming into contact with potential ignition sources. This approach provides a safe, cost-effective, and scalable solution for explosion protection.
All TLS systems are designed in compliance with GB/T 3836.5-2017 and meet the following classification levels:

• Ex px: Downgrades Zone 1 to a non-hazardous area
• Ex py: Downgrades Zone 1 to Zone 2
• Ex pz: Downgrades Zone 2 to a non-hazardous area

3. Core Features of TLS Pressurized Containers

• High Integration & Compatibility: Supports centralized installation of critical components such as control modules, power supplies, VFDs, analyzers, and communication units—saving valuable space while ensuring functional safety.
• Intelligent Control System: Equipped with internal pressure monitoring, gas detection, and auto interlock modules. Local alarms and remote signal outputs ensure safe, real-time operation。
• Ventilation Mode Adaptable: TLS positive pressure container adopts positive pressure ventilation type structure, maintains the positive pressure state inside the box through continuous air supply, applicable to the site conditions with stable gas source (such as compressed air or purified gas system), can effectively respond to the operation needs of petrochemical, offshore and other typical explosion-proof places.
• Easy Deployment & Customization: Fully customizable in terms of dimensions, cut-outs, and internal bracket layouts. Compatible with wall-mounted, skid-mounted, containerized, and freestanding installations. Material options include weathering steel and powder-coated carbon steel for corrosive environments.

4. Why Choose TLS?

• Over a decade of expertise in pressurized enclosure system design and manufacturing
• Products certified to IECEx, ATEX, and GB explosion protection standards
• Fast customization, bulk delivery, and on-site technical support
• Proven project experience across Asia, the Middle East, and North America, with solutions widely adopted in chemical, energy, and offshore sectors—especially in environments with complex installation conditions and high-density electrical integration

Conclusion

As a key component in electrical safety infrastructure, pressurized explosion-proof containers are becoming indispensable for achieving intrinsic safety and system reliability in hazardous industries. TLS remains committed to advancing the development and deployment of Ex p systems, helping our clients achieve safer, smarter, and more efficient operations.

TLS Offshore Containers / TLS Special Containers 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 pressurised mud logging cabin brochure
MCC | Switchgear | VFD | VSD pressurised shelter

Keywords:#Pressurized explosion-proof enclosure,#Hazardous area electrical equipment,#Zone 1 and Zone 2 safety,#Explosion-proof container module,#Positive pressure ventilation,#Chemical plant explosion protection,#ATEX and IECEx certified enclosures,#Custom explosion-proof solutions,#Electrical enclosure for flammable gas,#Modular Ex p container systems,#Industrial automation safety,#Explosion-proof electrical housing,#Gas detection and pressure monitoring,#Smart control enclosure system,#Corrosion-resistant electrical cabinet,#Skid-mounted pressurized units,#Offshore and onshore hazardous zones,#Explosion-proof integration solutions
​

Positive Pressure Explosion-Proof is a widely adopted method used in hazardous environments to prevent explosions by maintaining a higher internal pressure within a sealed container. This controlled internal overpressure effectively blocks the ingress of flammable gases or vapors from the surrounding atmosphere, thereby reducing the risk of explosive gas mixtures forming inside the container.

1. Creating a Protective Barrier Through Pressure Differential
At the core of Positive Pressure Explosion-Proof lies the physical principle of gas diffusion—from high-pressure zones to low-pressure zones. By maintaining a slight overpressure inside the container, any external flammable gas is effectively prevented from entering. This isolation ensures that even if explosive gases are present outside, they cannot mix with the air inside, reducing the possibility of ignition.

2. Disrupting the Fire Triangle
The fire triangle consists of three essential elements: fuel, oxygen, and an ignition source. An explosion can only occur when all three are present simultaneously. The positive pressure system ensures that the conditions for the formation of explosive gas mixtures inside the container are not present by preventing combustible gases from entering the container, and that even if an ignition source and oxygen are present, an explosive environment will not be formed, thus effectively avoiding the risk of explosion.

3. Structural Integrity and Material Considerations
For positive pressure systems to function reliably, the container must be structurally sound and well-sealed. High-quality sealing prevents pressure loss, while the materials used must withstand internal overpressure and resist corrosion from external environmental factors. These design elements are critical to maintaining system integrity over long-term operation in harsh or hazardous conditions.

4. Monitoring and Control Systems
Maintaining stable internal pressure is crucial for effective explosion protection. Positive pressure systems typically incorporate pressure sensors, regulators, and control interfaces to monitor and adjust internal pressure levels.
When the internal pressure drops below the preset threshold, the pressurization system—either automatically or manually—can be activated to restore positive pressure. Conversely, if the pressure exceeds safety limits, exhaust or relief valves are engaged to prevent over-pressurization and potential structural damage.
This dual mechanism ensures both safety and reliability, accommodating various operational scenarios where full automation may not be practical or necessary.

Conclusion​
Positive Pressure Explosion-Proof provides a practical and effective solution for safeguarding electrical equipment, control systems, and instrumentation in hazardous areas. By maintaining an internal overpressure, it minimizes the risk of explosive atmospheres forming inside enclosures, significantly enhancing operational safety.
With its widespread use in industries such as oil & gas, petrochemicals, offshore operations, and energy storage systems, understanding and properly implementing this technology is essential. Whether in design, commissioning, or maintenance, a deep understanding of positive pressure principles ensures compliance, safety, and long-term system performance.
 
TLS Offshore Containers / TLS Special Containers 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 pressurised mud logging cabin brochure
MCC | Switchgear | VFD | VSD pressurised shelter
 
Keywords:#Positive pressure,#Explosion protection,#Explosion-proof,#Hazardous areas,#Pressurized enclosure,#Overpressure,#Flammable gases,#Ingress protection,#Gas diffusion,#Fire triangle,#Ignition source,#Fuel isolation,#Combustion prevention,#Sealed enclosure,#Pressure monitoring,#Relief valve,#Pressure sensor,#Manual activation,#Control system,#Industrial safety

In high-risk industries such as oil & gas, chemical processing, and offshore platforms, explosive gas atmospheres pose significant safety challenges. According to the IEC 60079-10-1 standard, industrial sites are classified into Zone 0, Zone 1, and Zone 2 based on the frequency and duration of the presence of explosive gases. Each zone comes with distinct requirements for the design and construction of functional enclosures, and understanding these differences is critical for safety and regulatory compliance.

Zone 0: Continuous Explosive Atmospheres

Zone 0 is the most dangerous explosive atmosphere and usually refers to internal spaces such as fuel tanks or chemical reactors where explosive gas mixtures are present continuously or for long periods of time.
As a rule, the installation of any non-essential enclosures or electrical equipment in Zone 0 should be avoided.If necessary, only intrinsically safe (Ex ia) or encapsulated (Ex ma) equipment according to IEC 60079-11 is permitted.The system should have continuous gas monitoring capability and be able to trigger an automatic power-off or alarm mechanism when a set threshold is reached.This ensures reliable operation in extreme Zone 0 environments with complete protection against dust and prolonged submersion in water.

Zone 1: Occasional Explosive Atmospheres

Zone 1 is an area where an explosive atmosphere may occur during normal operation, such as an offshore drilling rig work area or an oil refinery pump room.The enclosure must be protected by one or more of the following methods: explosion-proof (Ex d), pressurised (Ex p) or combined (Ex db + Ex pb).The pressurised system must ensure that the pre-blowing volume is at least 5 times the internal volume of a typical gas (according to IEC 60079-2) or 10 times the internal volume of hydrogen.A pressure monitoring interlock must be installed to automatically shut down the system if the pressure falls below 50 Pa (typical threshold; actual values may depend on product specifications or project requirements).Depending on the environment in which the equipment is installed, the enclosure should have a protection rating of not less than IP54 (indoor) or IP65 (outdoor) to ensure that the dust and water resistance meets the requirements for use.A two-channel gas detector should be installed with an alarm threshold set between 10% and 25% of the LEL (lower explosive limit).Materials must be explosion-proof, anti-static and corrosion-resistant.

Zone 2: Rare and Abnormal Explosive Atmospheres

Zone 2 areas experience explosive gas atmospheres only in abnormal conditions and for short durations, such as gas station ventilation zones or transition areas adjacent to Zone 1. Allowed equipment types include increased safety (Ex e), non-sparking (Ex nA), restricted breathing (Ex nR), and simplified pressurized enclosures (Ex pz). Even simplified systems must ensure a 5x air volume purge before energization. For outdoor enclosures, materials such as 316L stainless steel is recommended, with steel containers having a minimum thickness of 3 mm and GRP containers a minimum thickness of 8 mm（These thicknesses are based on industry best practices or product-specific standards, not on IEC mandates.）.

Conclusion

All explosion-proof container designs must strictly follow relevant standards, including IEC 60079, ATEX, and GB 3836. A few critical points to note: The commonly used designation “Ex de” is non-standard. The correct classification is “Ex db eb,” indicating a compound flameproof and increased safety solution. Pressurized containers (Ex p) are not permitted in Zone 0 and are only applicable in Zone 1 and Zone 2.
Each hazardous zone imposes increasing or decreasing demands on functional container design. Zone 0 allows only intrinsically safe or encapsulated equipment, Zone 1 requires multi-layered explosion protection strategies, and Zone 2 allows simplified protections but still requires adherence to core safety standards. By aligning design and manufacturing with the appropriate zone classification and international standards, equipment safety and operational integrity can be fully assured in explosive gas environments.


TLS Offshore Containers / TLS Special Containers 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 pressurised mud logging cabin brochure
MCC | Switchgear | VFD | VSD pressurised shelter
 
Keywords:#Hazardous Zones,#IEC 60079-10-1,#Zone 0,#Zone 1,#Zone 2,#Explosion-proof Enclosures,#Intrinsically Safe (Ex ia),#Encapsulation (Ex ma),#Flameproof (Ex d),#Pressurized (Ex p),#Compound Protection (Ex db + Ex pb),#Purge Systems,#Pre-purging Volume,#Gas Detection,#Automatic Shutdown,#IP68 Protection,#Non-sparking (Ex nA),#Increased Safety (Ex e),#Restricted Breathing (Ex nR),#Corrosion Resistance

IEC60079-13:2010 has introduced significant updates and improvements to the pressurized explosion-proof (Ex p) techniques, particularly regarding the types of explosion protection. The standard now categorizes pressurized rooms into four different types of protection: px, py, pz, and pv. Each type has distinct applications, protection levels, monitoring requirements, and device specifications. This blog will delve into the differences between these four pressurized protection types and explore their applications in various industrial environments.

1. px Explosion-Proof (Highest Level of Protection)

The px explosion-proof protection is suitable for Zone 1 and Zone 2 hazardous areas. The primary protective gas used is clean air, although inert gases can be used under special conditions. The critical requirement is that the internal pressure must always be higher than the external environment, ensuring that explosive gases cannot enter the protected area. The equipment protection level (EPL) must meet the Gb classification, offering a higher level of explosion protection.
This type of explosion protection is commonly used in control rooms within petrochemical plants and refineries, as well as electrical cabinets and distribution rooms in areas with high explosive gas risks, such as hydrogen or methane leakage zones.

2. py Explosion-Proof (Medium Level of Protection)

The py explosion-proof protection is also suitable for Zone 1 and Zone 2 environments. Typically, the EPL required is Gb, although it can be relaxed to Gc under specific conditions. Non-explosion-proof electrical equipment may be used with interlocking protection. Compared to px protection, py offers more tolerance for pressure fluctuations.
This protection type is typically used for auxiliary equipment in chemical production workshops, non-core process areas in pharmaceutical plants, or as a supplementary solution to px protection.

3. pz Explosion-Proof (Lowest Level of Protection)

The pz explosion-proof protection is only applicable in Zone 2 environments, where explosive gases are occasionally present. A key requirement for pz protection is that when the intake air is from Zone 2, combustible gas detectors must be installed to ensure the safety of the air entering the room. The EPL for pz protection can be Gc.
pz protection is ideal for lighter industrial settings, food processing, pharmaceutical plants, and other non-high-risk environments. It is typically used in well-ventilated areas, such as the perimeter of factories, as a supplementary measure to px or py protection.

4. pv Explosion-Proof (Formal introduction and regularisation)

Introduced by IEC60079-13:2010, the pv explosion-proof protection is suitable for non-hazardous areas that still have internal sources of release. This protection works by diluting the explosive substances inside the room to below safe concentration levels, thus preventing explosions. The EPL for pv protection may range from Gb to Gc, allowing for the use of non-explosion-proof equipment.
The pv protection method is widely used in environments such as laboratories, electronics manufacturing, and precision instrument production, where volatile chemicals are present. It is also applicable in fuel testing stations and other areas with controlled risks where small amounts of combustible gases might be present.

5. Conclusion

IEC60079-13:2010 has significantly expanded the applicability of pressurized explosion-proof techniques by introducing the pv protection type and refining the px, py, and pz protection methods. These improvements make explosion-proof technology suitable for a wider range of industrial environments. Each protection type varies in terms of hazardous area classification, device selection, and required protective gas. When choosing an explosion-proof type, it is essential to consider factors such as the application environment, combustible substance release conditions, and explosion-proof costs.
As industrial safety standards continue to evolve, pressurized explosion-proof technologies will continue to develop, providing more efficient and safer explosion protection solutions across industries.

​​If you’re looking for a safe, durable, and certified solution for your offshore operations, TLS Offshore EX-Proof Containers are the perfect choice. With their innovative pressurization system and extensive certifications, TLS ensures the highest levels of safety and performance in some of the most challenging conditions.
 
TLS Offshore Containers / TLS Special Containers 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 pressurised mud logging cabin brochure
MCC | Switchgear | VFD | VSD pressurised shelter
​
Keywords:#IEC60079-13:2010,#Explosion-proof protection,#Pressurized explosion protection,#px protection,#py protection,#pz protection,#pv protection,#Equipment protection level (EPL),#Hazardous area classification,#Zone 2,#Inert gases,#Combustible gas detectors,#Explosion-proof devices,#Industrial safety standards.

Positive pressure explosion-proof containers are widely used in hazardous industries like chemical processing, offshore operations, and oil & gas. However, misconceptions about these containers can lead to improper selection, misuse, and safety risks. Let’s clarify five common misunderstandings.

Misconception 1: They Provide 100% Explosion Protection

Many assume these containers completely eliminate explosion risks. In reality, they reduce risk by maintaining internal pressure higher than the external environment, preventing hazardous gases from entering. However, system failures, seal degradation, or poor maintenance can compromise protection. Regular inspections are essential for reliable operation.

Misconception 2: Suitable for All Hazardous Environments

While effective in many hazardous areas, positive pressure containers are not a universal solution. Extreme conditions, such as high combustible dust concentrations or complex gas dispersion, may require additional safety measures. A thorough risk assessment ensures suitability for specific applications.

Misconception 3: No Maintenance Required

Installation alone does not guarantee long-term safety. Key maintenance tasks include:
Pressure Monitoring: Prevents gas ingress or structural stress.
Seal Inspection: Ensures airtight integrity.
Alarm System Testing: Verifies pressure and gas detection functions.
Routine maintenance extends lifespan and ensures compliance with safety standards.

Misconception 4: No Difference from Standard Sealed Enclosures

Though similar in appearance, their functionality differs significantly. Standard sealed enclosures rely on static sealing, while positive pressure containers actively prevent gas ingress through continuous pressurization. Designed for Zone 1 and Zone 2 hazardous areas, they require ongoing monitoring to maintain explosion-proof integrity.

Misconception 5: High Cost, Not Worth the Investment

Despite the high initial cost, positive pressure explosion-proof containers offer long-term value due to their durability, low maintenance needs, and risk reduction benefits. As safety regulations tighten and demand in sectors like renewable energy grows, these containers remain a smart investment for high-risk industries.

Conclusion: Understanding and Proper Use Are Key

Positive pressure explosion-proof containers provide an efficient and safe explosion-proof solution. However, selecting, installing, and using them correctly while avoiding common misconceptions is crucial. With proper understanding and regular maintenance, a positive pressure explosion-proof system can function effectively and provide a safer and more reliable industrial environment.

TLS Offshore Containers / TLS Special Containers 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 pressurised mud logging cabin brochure
MCC | Switchgear | VFD | VSD pressurised shelter

Keywords:#Positive Pressure,#Explosion-Proof,#Hazardous Environment,#Industrial Safety,#Risk Reduction,#Pressure Monitoring,#Seal Inspection,#Gas Detection,#Zone 1 & Zone 2,#Hazardous Gas,#Compliance,#Maintenance,#Investment,#Safety Regulations,#Offshore Operations

​Unmatched Protection for Hazardous Offshore Environments
In offshore oil and gas operations, safety is paramount. The presence of flammable gases and harsh environmental conditions demands cutting-edge solutions to protect personnel and equipment. TLS introduces the Offshore Ex-Proof Positive Pressure Container, engineered to thrive in Zone 1&2 hazardous areas while ensuring compliance with ATEX&IECEx certified electrical equipment. Designed to withstand extreme offshore conditions, these containers set a new benchmark for safety, reliability, and efficiency.

What Are Offshore Ex-Proof Positive Pressure Containers?
TLS’s Offshore Explosion-Proof Positive Pressure Containers are designed specifically for hazardous offshore environments, where the risk of explosions and exposure to toxic substances is high. By maintaining a positive internal pressure, these containers prevent flammable gases from entering, thereby minimizing the risk of ignition. They provide a safe, controlled workspace for offshore operations, ensuring uninterrupted functionality in challenging conditions.

Key Benefits of TLS Offshore Ex-Proof Positive Pressure Containers
1. Maximum Safety & Explosion Protection

• Engineered to operate in Zone 1 and Zone 2 hazardous areas.
• ATEX/IECEx-certified components ensure compliance with international safety regulations.
• Positive pressure technology prevents the ingress of hazardous gases, reducing explosion risks.

2. Built for Offshore Durability

• Constructed with high-strength materials to endure harsh marine environments.
• Resistant to corrosion, extreme temperatures, and strong winds.
• Long-lasting performance with minimal maintenance requirements.

3. Customizable for Unique Offshore Needs

• Tailored configurations available for workspace, control rooms, labs, or storage units.
• Options for integrated HVAC, fire suppression, and gas detection systems.
• Seamless integration with existing offshore platforms and facilities.

4. Cost-Effective & Operational Efficiency

• Reduces downtime and risk of operational disruptions.
• Minimizes maintenance costs while ensuring compliance with safety regulations.
• Improves overall productivity by providing a safe and efficient work environment.

5. Regulatory Compliance & Certification

• Fully compliant with ATEX, IECEx, and other offshore industry standards.
• Designed to meet strict regulatory requirements for offshore hazardous areas.
• Ensures peace of mind with third-party testing and certification.

Why Choose TLS for Offshore Safety Solutions?
TLS is a trusted leader in the offshore container industry, specializing in explosion-proof solutions for hazardous environments. Our expert engineering team ensures that each container meets the highest safety, durability, and performance standards. Whether for offshore oil rigs, floating production units (FPSO), or drilling platforms, TLS provides tailored, state-of-the-art solutions to enhance operational safety and efficiency.

Secure Your Offshore Operations with TLS Ex-Proof ContainersInvesting in TLS Offshore Ex-Proof Positive Pressure Containers means safeguarding your personnel, equipment, and overall operations. Don't compromise on safety—contact TLS today to learn more about our custom offshore container solutions and elevate your offshore operations to the highest safety standards.

TLS Offshore Containers / TLS Special Containers 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 pressurised mud logging cabin brochure
MCC | Switchgear | VFD | VSD pressurised shelter
 
 
Keywords: #Offshore safety solutions, #Explosion-proof containers, #Positive pressure containers, #ATEX certified offshore containers, #IECEx certified explosion-proof containers, #Zone 1 Zone 2 hazardous areas, #Offshore hazardous environment containers, #Explosion protection for offshore operations, #Safety containers for oil rigs, #Offshore drilling safety equipment, #Explosion-proof storage containers

In the high-risk environments of offshore operations, safety, efficiency, and regulatory compliance are non-negotiable. Remote Operated Vehicles (ROVs) play a crucial role in underwater inspections, maintenance, and repair tasks in hazardous zones. To ensure seamless operations while prioritizing safety, ROV Ex-Proof Control Cabins and Containers have emerged as essential solutions for offshore and industrial applications.
 
What Are ROV Ex-Proof Control Cabins and Containers?
ROV Ex-Proof Control Cabins and Containers are specialized enclosures designed to house control systems for remotely operated vehicles in hazardous locations. These include offshore drilling platforms, oil and gas rigs, chemical processing plants, and other explosion-prone areas where standard electronic equipment could pose significant ignition risks.
 
Built to withstand extreme conditions, these explosion-proof cabins ensure that critical control functions remain operational even in the most challenging offshore environments.
 
Ensuring Compliance with Safety Standards
Working in hazardous locations requires strict adherence to global safety regulations. ROV Ex-Proof Control Cabins and Containers comply with key industry standards, including:

• ATEX (Atmosphères Explosibles) Certification – Ensuring compliance with European explosion-proof requirements.
• IECEx (International Electrotechnical Commission Explosive Atmospheres) Certification – Verifying international safety for equipment in explosive environments.
• Other regional and industry-specific certifications as required.

 
By meeting these stringent standards, these control cabins mitigate the risk of explosions, ensuring maximum safety for personnel and assets.

Key Features and Advantages of ROV Ex-Proof Control Cabins
1. Explosion-Proof Engineering
ROV Ex-Proof Control Cabins are constructed using explosion-proof materials and designs, preventing hazardous gases and vapors from igniting inside the enclosure.
2. Durable and Robust Construction
Built to endure harsh offshore conditions, these control cabins are resistant to extreme temperatures, high pressure, and corrosive marine environments, ensuring long-term reliability.
3. Advanced Control and Monitoring Systems
Equipped with state-of-the-art control systems, these cabins enable precise and efficient ROV operations, improving offshore performance and safety.
4. Remote Surveillance Capabilities
With real-time telemetry and monitoring features, operators can track critical parameters remotely, enhancing situational awareness and enabling rapid response to any anomalies or emergencies.
5. Modular and Portable Design
Designed for easy transportation and quick installation, these modular control cabins offer flexibility in deployment, making them suitable for various offshore and industrial applications.

Operational Benefits of ROV Ex-Proof Control Cabins
Integrating ROV Ex-Proof Control Cabins and Containers into offshore projects significantly improves operational efficiency and risk management. Key benefits include:

• Reduced Downtime: Durable construction and high-performance design minimize equipment failures, ensuring maximum uptime and operational continuity.
• Enhanced Safety: Explosion-proof technology eliminates risks associated with electrical equipment in hazardous environments, prioritizing worker and asset safety.
• Streamlined Maintenance: Modular designs facilitate easy servicing, repairs, and component replacements, minimizing disruption to ongoing operations.

Conclusion: A Smart Investment for Offshore Safety
ROV Ex-Proof Control Cabins and Containers are transforming offshore operations by combining advanced technology with stringent safety compliance. Investing in these specialized control enclosures ensures reliable ROV operations, enhances efficiency, and safeguards personnel in hazardous environments.
 
For companies operating in offshore and industrial sectors, adopting explosion-proof control cabins is not just a regulatory necessity but a strategic advantage. By implementing these solutions, businesses can navigate hazardous environments with confidence while optimizing performance and safety.
 
TLS Offshore Containers / TLS Special Containers 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 pressurised mud logging cabin brochure
MCC | Switchgear | VFD | VSD pressurised shelter
 
 
Keywords: #Offshore explosion-proof cabins, #Hazardous environment control rooms, #Ex-proof ROV control solutions, #ATEX-certified offshore containers, #IECEx explosion-proof control cabins, #Oil and gas safety equipment, #ROV operations in hazardous areas, #Ex-proof equipment for offshore rigs, #Safe zone ROV control cabins, #Industrial explosion-proof monitoring solutions, #Hazardous area electrical enclosures

​In industries where explosive or flammable materials are prevalent, ensuring the safety of equipment and personnel is of utmost importance. Positive pressurized containers are designed to meet the strict explosion-proof requirements of these hazardous environments. This blog explores the core principles behind these containers and why they are essential for ensuring operational safety.
 
What Are Positive Pressurized Containers?
Positive pressurized containers are specially designed enclosures that maintain a controlled internal pressure to prevent the ingress of hazardous gases or dust. These containers are crucial for housing electrical equipment and machinery that may not be explosion-proof but need to be safely operated in environments with a risk of explosion.
 
How Do Positive Pressurized Containers Work?
The principle behind positive pressurized containers lies in their ability to maintain a higher internal pressure than the surrounding environment, thereby preventing the entry of flammable or explosive materials. Here's a breakdown of the process that makes these containers effective in explosive environments:

• Automatic System Activation

Once the total power supply is switched on, the positive pressure ventilation system is automatically activated. This triggers the explosion-proof blast system to start the process of purging the container.

• Fresh Air Inflow

The system pulls fresh air from a safe distance, typically 30 meters away from the hazardous zone, using an explosion-proof centrifugal fan. This fresh air is introduced into the container to maintain the positive pressure required to keep the environment safe.

• Purging Process

The incoming fresh air circulates within the container, effectively purging the internal environment. This purging process ensures that the container achieves a positive pressure of over 50Pa. The purging typically lasts for up to weeks, depending on the operating conditions.

• Controlled Power Activation

After the container has been properly purged and the required positive pressure is established, the total power supply is activated. This allows the non-explosion-proof equipment within the container to operate safely under controlled conditions.

• Continuous Monitoring and Alarm System

A key feature of positive pressurized containers is the integrated monitoring and alarm system. The explosion-proof control system constantly monitors the internal conditions of the container. If dangerous gases are detected or if the required positive pressure falls below the threshold, an alarm is triggered. If the system fails to meet safety conditions within a set timeframe, it automatically shuts down the non-explosion-proof equipment inside the container to prevent potential risks.
 
Why Positive Pressurized Containers Matter
Positive pressurized containers are an essential safety feature in environments where explosive or flammable materials are present. Their design ensures that non-explosion-proof equipment can safely operate within hazardous zones by creating a safe and controlled environment inside the container. Here are some of the key benefits:

• Safety: By maintaining a constant positive pressure, these containers help prevent the ingress of hazardous gases and dust, significantly reducing the risk of an explosion.
• Cost-Effective: Companies can use regular non-explosion-proof equipment in positive pressurized containers, saving on the high costs of explosion-proof alternatives.
• Compliance: These containers adhere to the latest safety standards and regulations, ensuring that your operations remain in compliance with industry requirements.

TLS Offshore Pressurized Containers
​At TLS Offshore Containers, we prioritize safety and compliance. Our positive pressurized containers are designed and manufactured to meet the highest standards in the industry. With cutting-edge features and robust testing procedures, our containers provide a secure and explosion-proof environment for your operations, no matter how demanding the conditions.
 
TLS Offshore Containers / TLS Special Containers 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 pressurised mud logging cabin brochure
MCC | Switchgear | VFD | VSD pressurised shelter
 
 
Keywords: #Explosion-proof containers, #Hazardous environment safety, #Positive pressure ventilation system, #Explosion-proof equipment housing, #Safety containers for explosive areas, #Hazardous area enclosures, #Explosion-proof technology, #Industrial safety containers, #Explosion protection systems, #Safe electrical equipment in hazardous zones, #Flammable material safety solutions

The core principle of a positive pressurized container is to establish and maintain an internal pressure higher than the external environment. This prevents hazardous or toxic gases from entering, providing a clean and safe environment inside the box. The operating mechanism mainly includes the following aspects:

1. Establishing and Maintaining Positive Pressure

A positive pressurized container continuously supplies clean air into the container through an external air supply system (typically consisting of fans and air ducts).

• Fan-driven Air Supply: Fans draw in external air and deliver clean air into the container.
• Pressure Difference Maintenance: As the air volume inside the container increases and the exhaust rate remains slow, the internal pressure rises, forming a positive pressure higher than the outside.
• Positive Pressure Effect: This pressure difference ensures airflow moves only from inside to outside, preventing external contaminated gases from entering.

2. Pressure Monitoring and Control

The positive pressurized container is equipped with differential pressure sensors and control systems to monitor the internal pressure in real-time.

• Minimum Pressure Requirement: Considering adjacent spaces, the positive pressure system should maintain at least 25 Pa of pressure when 50% of all outlets (excluding doors) are open. A drop below 25 Pa indicates system failure.
• Pressure Sensors: Measure the internal pressure and send data to the control system.
• Alarm System: If the internal pressure becomes abnormal (too high or too low), the system triggers visual and audio alarms to alert operators for timely inspection.
• Delay in Alarm Triggering: In case of door openings causing a temporary drop in pressure and external air entering the room, delayed alarms may be used. Door position sensors may be installed to verify the door status and airflow changes.

Note: Unless using a buffer room/air-lock door system, opening the door will reduce the pressure difference, potentially triggering unnecessary alarms.

3. Sealing and Airtightness

The structural design of the positive pressure box must ensure excellent airtightness to prevent pressure loss and the infiltration of pollutants.

• Sealing Materials: High-performance rubber or silicone gaskets are commonly used at joints to ensure no air leakage.
• Container Design: Precisely engineered frames and panels reduce gaps and enhance overall airtightness.

4. Temperature and Humidity Control

The air quality inside the positive pressurized container depends not only on filtration but also on temperature and humidity control (suitable for specific application scenarios).

• Temperature Control: Some positive pressurized containers include heating or cooling systems to maintain optimal working temperatures.
• Optional Humidity Adjustment: Dehumidification or humidification systems regulate air moisture levels, preventing overly dry or moist conditions from affecting operations or sample storage.

​5. Air Exchange Frequency and Volume

The air exchange efficiency of a positive pressurized container is a crucial performance indicator.

• Air Change Frequency: Rapid air exchange removes polluted air from the container and replaces it with clean air. The air change rate should be at least five times per hour.
• Air Volume: The positive pressure and overall manual ventilation system should provide an air exchange volume at least ten times the room’s capacity. Exceptions may be validated through analysis in accordance with standards GB/T3836.147-2019 like 6.4.4 or 7.5.3. 
• Pollutant Removal: Under the influence of positive pressure and airflow, contaminants are quickly expelled by the exhaust system, ensuring a consistently clean environment.

Conclusion
The positive pressurized container ensures a clean and uncontaminated working environment through precise air supply, sealing design, and pressure monitoring. While preventing external pollutants, it maintains airflow direction, cleanliness, and a stable positive pressure state. These features make it widely used in industries such as pharmaceuticals, biotechnology, semiconductor manufacturing, and laboratory research.
 

TLS Offshore Containers / TLS Special Containers 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 pressurised mud logging cabin brochure
MCC | Switchgear | VFD | VSD pressurised shelter
 
Keywords:#Hazardous Gas Prevention，#Pressure Difference，#Positive Pressure Effect，#Pressure Monitoring，#Differential Pressure Sensors，#Alarm System，#Sealing and Airtightnes
 
 

 

​In the demanding environment of offshore operations, safety is paramount. The risk of fire and gas leaks within pressurized cabins or containers is a constant concern, requiring robust and reliable safety solutions. TLS Offshore Containers has addressed this critical need with its cutting-edge, intelligent Combined Pressurization Fire & Gas (CPFG) system.
 
Understanding CPFG Systems
CPFG systems are engineered to provide comprehensive protection against fire and gas hazards within enclosed spaces. They work by maintaining a positive pressure inside the cabin, preventing the ingress of flammable or toxic substances. In the event of a fire or gas leak, the system triggers alarms, initiates ventilation, and can even activate fire suppression systems.
 
TLS Offshore Containers' Intelligent CPFG System
TLS has taken CPFG technology to the next level with its intelligent system, incorporating advanced features and capabilities:

• PLC-Based Control: The system utilizes a Programmable Logic Controller (PLC) for sophisticated control and automation. This allows for complex logic sequences, adaptable responses, and remote monitoring.
• Comprehensive Monitoring: The system integrates a range of sensors, including gas detectors, smoke detectors, pressure switches, and flow switches. This enables real-time monitoring of critical parameters and ensures rapid detection of any anomalies.
• Intelligent Response: The PLC processes sensor data and triggers appropriate responses based on pre-defined logic. This can include activating alarms, initiating ventilation, or even shutting down equipment.
• Remote Access: The system can be accessed remotely for monitoring, troubleshooting, and configuration. This provides greater flexibility and control for operators.

 
Benefits of TLS Offshore Containers' CPFG System

1. Enhanced Safety: The system significantly improves safety by providing early warning and automated responses to fire and gas hazards.
2. Reduced Downtime: By preventing incidents, the system helps minimize downtime and operational disruptions.
3. Increased Productivity: The system's automation and remote access capabilities contribute to increased productivity and efficiency.
4. Compliance: The system helps ensure compliance with safety regulations and standards.

 
Conclusion
TLS Offshore Containers' intelligent CPFG system is a game-changer for offshore safety. It represents a significant advancement in fire and gas protection, offering unparalleled reliability, flexibility, and control. By investing in this technology, operators can ensure the safety of their personnel and assets, while also maximizing productivity and efficiency.
 
 
TLS Offshore Containers / TLS Special Containers 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 pressurised mud logging cabin brochure
MCC | Switchgear | VFD | VSD pressurised shelter
 
 
Keywords: #CPFG system, #offshore container safety, #fire and gas protection, #PLC-based control, #TLS Offshore Containers