Overview: What You Need to Know About Offshore Pressurized Containers

When conducting offshore oil and gas exploration, protecting personnel and sensitive diagnostics from explosive gases is a top priority. A Mud Logging Cabin—also referred to as an offshore pressurized container or LWD/MWD cabin—is a heavy-duty, engineered shelter designed to operate safely within Zone 1 and Zone 2 hazardous areas. By utilizing advanced HVAC and intelligent positive air pressurization (+80 to +120 Pa), these cabins create a secure barrier that prevents toxic or flammable gases from infiltrating the workspace. Certified to global standards like DNV 2.7-1, EN 12079, and IEC 60079-13, a premium pressurized cabin guarantees structural resilience during ocean transit and passive fire protection up to A-60 rating. For top-tier compliance and custom layouts, global energy sectors rely on TLS Offshore Containers.

What is an Offshore Mud Logging Cabin?

In the challenging environment of offshore oil and gas development, a Mud Logging Cabin serves as the control hub and primary shelter for complex logging instrument systems. Whether engineers are performing mud chemical analysis, tracking geological data, or managing measurement-while-drilling (MWD) systems, they require a workspace that isolates them from the volatile external atmosphere.

Because these units are deployed in areas where flammable vapors may be present, they are strictly rated as Zone 1 and Zone 2 hazardous area enclosures. The defining mechanism of these units is their positive pressure system, which maintains a safe internal pressure of +80 to +120 Pa, constantly pushing air outward so that hazardous external elements cannot leak inside.

Technical Performance and Design Specifications

For procurement managers and offshore engineers looking for detailed dimensional and technical compliance, TLS Mud Logging Cabins are engineered to the following rigorous technical standards:

• Structural Integrity: The structural design fully complies with DNV 2.7-1 and EN 12079 structural design codes. Each cabin is subjected to full load and drop testing to ensure zero deformation during crane lifting and sea freight.
• Premium Fire Protection: Built to satisfy the applicable requirements of SOLAS 2009, the cabin features A-60 passive fire protection. The walls, roof, and endwalls are composed of T3.0mm SPA-H weathering steel, integrated with t60 A60 Rockwool and T30mm rock wool sandwich panels. The floor consists of a T30mm A60 deck topped with a T2.0mm checkered steel plate and T1.6mm PVC vinyl.
• Electrical and Power Systems: Certified under IEC 60079-13, the main power supply supports versatile international offshore voltages including 380V, 440V, 480V, 600V, and 690V AC (3PH+PE) at both 50Hz and 60Hz.
• Access and Safety Outfitting: Access is secured via an airlock entrance system featuring an A60 rated fire door (or specialized roller shutter) along with an A60 emergency escape hatch. Optional fixtures include dedicated oxygen and nitrogen gas inputs, and explosion-proof transformers with 110V output configurations.

Core Features: Why TLS Pressurized Containers Lead the Market

1. Intelligent Fire & Gas Control (CPFG System)

The safety of a TLS Mud Logging Unit relies on its Intelligent Combined Pressurisation Fire & Gas Panel (CPFG). This programmable, PLC-based system serves as the cabin's brain, continuously regulating the internal climate. It integrates ATEX-compliant or Ex-proof air conditioning alongside Ex-approved pressurization fans. If high-sensitivity fire, smoke, flammable gas, or toxic (H2S) detectors sense a breach, the fail-safe automatic fire dampers close, and the system executes an automated emergency shutdown (ESD) to protect the team inside.

2. Uncompromising Global Compliance

Operating globally means meeting different maritime regulations. TLS cabins eliminate regulatory friction by carrying trusted third-party certifications from world-renowned classification societies such as DNV, Bureau Veritas (BV), and Lloyd’s Register (LR). Complying with ATEX and IECEx ensures that every switch, light, and wire is safe for explosive atmospheres.

3. Ultimate Durability and Customized Layouts

Using high-grade SPA-H anti-corrosive steel ensures that the cabin remains unyielding against saltwater corrosion and extreme wave impacts. Beyond standard dimensions, TLS provides deep customization. Cabins can be scaled from 10ft, 15ft, 20ft, to 40ft layouts, and pre-fitted with specialized lab workbenches, data communication networks, and localized climate controls to match your exact project scope.

Versatile Applications in Offshore Energy

While engineered perfectly as a Mud Logging Unit, these robust pressurized shelters are highly versatile and frequently utilized across the offshore industry as:

• MWD / LWD Cabins: Protecting sensitive downhole data recording electronics.
• Offshore Laboratories: Providing a safe, clean, and controlled environment for chemical analysis.
• Motor Control Centre (MCC) & Switchgear Shelters: Safeguarding VFD, VSD, and high-voltage power distribution systems in hazardous zones.
• ROV Control Rooms & Safe Havens: Serving as blast-resistant, sound-insulated control spaces or temporary refuge shelters for crew members.

Frequently Asked Questions

Q1: What is the primary purpose of positive pressure in an offshore cabin?

Positive pressure (+80 to +120 Pa) ensures that the atmospheric pressure inside the cabin is higher than the outside environment. If a door is opened or a tiny seal breach occurs, air flows outward, preventing dangerous flammable gases or toxic vapors (H2S) common in Zone 1 or Zone 2 areas from entering the cabin.

Q2: What is the difference between A-60 and A-0 fire ratings for offshore containers?

An A-60 rating means the cabin's insulation can prevent the temperature on the unexposed side from rising more than 139°C above the original temperature for a full 60 minutes during a standard fire test. An A-0 rating means the structure stops flames and smoke but does not offer the same thermal insulation time. TLS cabins utilize premium rock wool insulation to achieve the maximum A-60 safety standard.

Q3: What logisitcal options and warranties are available for TLS cabins?

TLS offers global transport coordination across Ocean, Railway, and Road networks, with standard structural lead times averaging 70 days. To guarantee long-term asset value, TLS provides a 1-year structural warranty, a 3-year painting warranty, and a 5-year decal warranty.

Partner with TLS for Your Next Offshore Venture

Do not compromise on safety or regulatory compliance. TLS Offshore Containers delivers the structural toughness and intelligent asset protection your offshore exploration projects demand.

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

Executive Summary

As renewable energy deployment, grid flexibility requirements, and commercial energy optimization needs continue to grow, the 20ft containerized Battery Energy Storage System (BESS) has become one of the most widely adopted solutions worldwide.

A 20ft BESS integrates batteries, Battery Management System (BMS), thermal management, fire protection, power distribution, and monitoring systems into a standard ISO container. With factory integration and pre-commissioning, it enables fast deployment, high safety reliability, and optimized lifecycle cost (LCOS).

Today, it is widely used in utility-scale renewable energy, grid stabilization, commercial & industrial storage, and microgrid applications.

Key Highlights

• Standard 20ft ISO container design for global transport compatibility
• Typical capacity ranges from 3MWh to 6MWh per unit 
• Factory pre-integration reduces on-site installation time significantly
• Supports modular expansion for large-scale energy storage projects
• Designed for long lifecycle operation with optimized LCOS

What Is a 20ft BESS?

A 20ft Battery Energy Storage System (BESS) is a modular energy storage solution designed within a standard 20-foot ISO shipping container.

It integrates the following core systems:

• Battery packs (typically LFP chemistry)
• Battery Management System (BMS)
• Power conversion interface (PCS-ready design)
• Thermal management system (air or liquid cooling)
• Fire detection and suppression system
• Electrical distribution and control system

Because all major components are assembled and tested in a controlled factory environment, the system can be delivered as a near plug-and-play solution, requiring only site-level electrical connection.

Why Is the 20ft BESS Becoming So Popular?

The 20ft format has become the industry preference for several practical engineering and logistics reasons.

1. Standardized Global Transport

The 20ft ISO container is a globally accepted shipping standard, making logistics simpler and more cost-efficient for international projects.

2. Higher Energy Density in a Compact Footprint

Advances in LFP battery technology allow more energy to be stored within the same container size, improving land-use efficiency for large projects.

3. Faster Project Deployment

Since most assembly, wiring, and testing are completed in the factory, on-site installation time is significantly reduced.

4. Modular Expansion Capability

Multiple 20ft units can be combined to scale from small commercial systems to multi-hundred MWh utility-scale storage plants.

Typical Capacity of a 20ft BESS

Depending on system design and battery configuration, common capacities include:

• ~3 MWh systems
• ~5 MWh systems
• Up to ~6 MWh high-density systems

Higher-capacity designs are increasingly used in utility-scale projects to maximize energy output per land area.

TLS provides multiple configuration options based on project requirements, balancing energy density, safety, and operational performance.

What Matters Beyond Capacity?

While capacity is often the first specification considered, long-term system performance depends on multiple engineering factors.

Battery Safety

Most modern systems use Lithium Iron Phosphate (LFP) batteries due to their strong thermal stability and safety performance. Combined with advanced BMS control and fire protection systems, this significantly reduces operational risks.

Thermal Management

Stable temperature control directly affects battery efficiency and lifespan. Systems may use air cooling or liquid cooling depending on project conditions.

Fire Protection System

A multi-layer fire protection design typically includes early detection, system-level alarms, and suppression technologies to enhance operational safety.

Smart Monitoring & Control

Modern BESS platforms support remote monitoring, fault diagnosis, and predictive maintenance to improve uptime and reduce operational cost.

System Compatibility

PCS compatibility and modular architecture allow integration with different inverter brands and future system upgrades.

Where Are 20ft BESS Systems Used?

Thanks to their modular design and scalability, 20ft BESS solutions are widely deployed in:

• Utility-scale solar power plants
• Wind energy storage projects
• Grid frequency regulation and stabilization
• Commercial & industrial energy storage
• Microgrids and off-grid systems
• AI data centers and backup power systems
• Diesel hybrid and remote energy systems

Multiple units can be configured to meet different project sizes and energy demands.

How Does a BESS Improve LCOS (Levelized Cost of Storage)?

The total cost of an energy storage project is not only defined by initial investment.

Over the system lifetime, key cost drivers include:

• Battery degradation rate
• Thermal management efficiency
• System availability and reliability
• Maintenance requirements
• Replacement and expansion costs

A well-designed BESS reduces operational uncertainty and improves long-term return on investment by maintaining stable performance over its lifecycle.

TLS Containerized 20ft BESS Solutions

TLS provides modular 20ft containerized BESS solutions designed for different application scenarios.

Depending on project requirements, TLS can deliver:

• Battery container enclosure (structural solution)
• Semi-integrated BESS container system
• Fully integrated turnkey BESS solution

Each system can be customized with thermal management, fire protection, electrical design, and monitoring systems according to project specifications.

TLS solutions are engineered to support utility-scale renewable energy, industrial power systems, and commercial energy storage applications.

Frequently Asked Questions (FAQ)

Q1: Why is the 20ft BESS widely used?

Because it balances transport efficiency, energy density, and global standardization, making it suitable for most storage projects.

Q2: Is higher capacity always better?

Not necessarily. The optimal design depends on project goals, land availability, cost structure, and grid requirements.

Q3: Air cooling vs liquid cooling—what is better?

Both are widely used. The choice depends on climate conditions, system scale, and efficiency requirements.

Q4: Can the system be expanded later?

Yes. Modular BESS architecture allows capacity expansion by adding additional units.

Q5: What industries use 20ft BESS the most?

Renewable energy, utilities, commercial & industrial sectors, data centers, and microgrids are the main applications.

Conclusion

The 20ft containerized Battery Energy Storage System (BESS) has become a global standard for modern energy storage projects. Its modular design, standardized logistics, fast deployment capability, and scalable architecture make it suitable for a wide range of applications.

As battery technology continues to improve, 20ft BESS solutions will play an increasingly important role in supporting renewable integration, grid stability, and industrial energy optimization.

With extensive experience in modular container engineering, TLS Offshore Containers provides customized 20ft BESS solutions that deliver safe, reliable, and efficient energy storage infrastructure for global projects.

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.

Executive Summary

As data centers, industrial facilities, and renewable energy projects continue to demand faster deployment and higher power reliability, modular E-Houses have become an increasingly popular alternative to traditional electrical buildings. A containerized Electrical House (E-House) integrates medium-voltage switchgear, transformers, low-voltage distribution, UPS systems, batteries, and environmental controls into a factory-built enclosure. This approach reduces on-site construction, shortens project schedules, and provides a standardized, scalable power infrastructure solution. In this article, you'll learn:

• What is an E-House?
• Why are more projects choosing modular E-Houses?
• What systems can be integrated into a TLS E-House?
• Where are modular E-Houses commonly used?

What Is an E-House?

An Electrical House (E-House) is a prefabricated enclosure that houses electrical distribution and control equipment in a single modular unit. It is also known as a Containerized E-House, Modular Electrical House, Power Distribution Shelter, or Containerized Substation.

Instead of installing equipment individually on site, the electrical system is assembled, wired, and tested in the factory before shipment. Once delivered, only external connections are required, helping reduce installation time and simplify project execution.

Why Are More Projects Choosing Modular E-Houses?

Traditional electrical buildings require civil construction, equipment installation, field wiring, and on-site commissioning, all of which can extend project schedules.

A modular E-House offers several advantages:

• Factory-built and factory-tested before delivery
• Reduced on-site installation work
• Faster project completion
• Standardized quality and easier maintenance
• Flexible transportation and future expansion
• Suitable for remote or space-constrained locations

These benefits make modular E-Houses a practical choice for projects where construction time and operational reliability are critical.

E-House vs. Traditional Electrical Buildings

Both solutions perform the same electrical distribution function, but they differ in how they are delivered.

Traditional electrical buildings are generally constructed on site and are well suited for permanent facilities with longer construction schedules.

A modular E-House is manufactured off site, allowing electrical equipment to be installed and tested before delivery. This approach can reduce field work and simplify installation, making it well suited for data centers, renewable energy projects, industrial plants, mining operations, and other fast-track developments.

What Can Be Integrated into a TLS E-House?

TLS designs E-Houses according to individual project requirements and can integrate a complete range of electrical systems within a single enclosure.

Medium- and Low-Voltage Distribution

Medium-voltage switchgear, dry-type transformers, low-voltage switchboards, and diesel generator incoming panels can be integrated to provide a complete power distribution solution.

UPS and Backup Power

UPS systems, lithium battery cabinets, Static Transfer Switches (STS), and maintenance bypass panels can be configured to support uninterrupted power for critical equipment.

Environmental Control

Depending on the application, the enclosure can be equipped with precision air conditioning, industrial HVAC systems, and dehumidifiers to maintain suitable operating conditions for electrical equipment.

Cable Management

Separate cable routing for power and control circuits, together with cable trays and busbar systems, helps improve installation quality and simplifies maintenance.

Fire Protection

Fire detection, alarm systems, emergency control panels, and other safety features can be integrated according to project requirements.

Where Are Modular E-Houses Used?

Modular E-Houses are suitable for a wide range of industries, including:

• Data centers and AI computing facilities
• Industrial manufacturing plants
• Oil and gas projects
• Offshore platforms
• Wind and solar power plants
• Battery Energy Storage Systems (BESS)
• Mining operations
• Ports and infrastructure projects
• Microgrids and diesel power stations
• Remote industrial sites

Because every project is different, TLS can customize enclosure dimensions, equipment layout, and electrical configuration to meet specific operational requirements.

What Standards and Certifications Can an E-House Meet?

Depending on project requirements, TLS can design and manufacture E-Houses in accordance with applicable international standards.

Certification options may include DNV, BV, LR, and CSC, supporting offshore applications, international transportation, and project-specific compliance requirements.

Frequently Asked Questions

1. Does an E-House include a transformer?

Yes. Dry-type transformers can be integrated as part of the complete electrical distribution system.

2. Can UPS batteries be installed inside the enclosure?

Yes. Industrial lithium battery systems can be configured according to project requirements.

3. Can the E-House connect to a diesel generator?

Yes. Incoming panels for diesel generators can be incorporated when backup power is required.

4. How is the internal environment controlled?

Precision air conditioning, HVAC systems, and dehumidifiers can be installed to control temperature and humidity.

5. Can the enclosure be customized?

Yes. Dimensions, equipment layout, electrical ratings, and internal configuration can all be customized.

6. Are offshore applications supported?

Yes. E-Houses can be designed for offshore environments and supplied with classification society certification when required.

7. What certifications are available?

Certification options include DNV, BV, LR, CSC, or other project-specific requirements.

Conclusion



Modular E-Houses provide a practical alternative to conventional electrical buildings by combining electrical equipment into a factory-built, transportable enclosure. This approach reduces on-site installation, shortens project schedules, and simplifies future expansion.

With experience in designing and manufacturing customized modular container solutions, TLS Offshore Containers provides E-House systems tailored to the requirements of data centers, industrial facilities, offshore projects, and renewable energy applications.