A custom MCC enclosure is a prefabricated containerized room for Motor Control Center panels and related electrical or automation equipment Depending on the project, it may house MCC panels, PLC cabinets, variablefrequency drives, switchgear, control panels and auxiliary systems
TLS configures the enclosure around the equipment layout, operating environment, site interfaces and required project standards It can be supplied as a prepared enclosure or with selected internal systems installed before delivery Positive pressure, fire protection and hazardousarea features are projectspecific options, not standard requirements for every MCC enclosure
What Does an MCC Enclosure Provide?
The enclosure provides a defined space that can:
- support and protect installed equipment;
- provide space for operation and maintenance;
- organize cable entry and internal routing;
- maintain the required internal environment;
- provide interfaces for site power, control and communication systems; and
- allow more work to be completed before the unit reaches the site
It does not replace the MCC equipment; it provides the space in which that equipment is installed and operated
How Is the Structure Configured?
TLS can adapt the enclosure structure to the equipment and installation conditions Configurable items may include:
- overall dimensions and internal layout;
- equipment supports and reinforced floor areas;
- antislip or antistatic flooring;
- doors and service access;
- cableentry openings and penetration locations;
- external connection points;
- lifting and transport features; and
- corrosionprotection system
Coating requirements are selected for the intended environment C4 or C5 systems may be specified where appropriate
Equipment weights, cabinet positions and service clearances are coordinated during design so that structural supports, openings and access arrangements match the selected equipment
How Are Temperature and Airflow Managed?
MCC panels, VFDs and other electrical equipment release heat, so the enclosure may require ventilation, air conditioning or another cooling arrangement
Available provisions can include:
- ventilation openings and air ducts;
- mounting points and cutouts for air conditioners;
- heatexchanger interfaces;
- louvers, rain hoods and dust filters; and
- insulated walls and ceilings
The final arrangement depends on equipment heat output, outdoor conditions and the permitted internal temperature
What Can Be Prepared for Electrical Installation?
An MCC enclosure can be prepared as an equipmentintegration platform rather than delivered as an untreated empty shell Depending on the agreed supply scope, TLS can provide:
- equipment mounting bases;
- cable trays and routing paths;
- floor or wall cable entries;
- lighting and internal power distribution;
- earthing provisions;
- equipment labels and interface identification; and
- space for customerinstalled panels and auxiliary systems
Early coordination of cabinet dimensions and cable routes helps ensure that trays, openings and access areas are positioned for the actual equipment The MCC panels may be installed by TLS, the customer or another system integrator, depending on the contract
Can an MCC Enclosure Be Used in a Hazardous Area?
Yes, when it is specifically designed and approved for that application TLS has supplied pressurized MCC shelters for hazardousarea projects, including Zone 2 applications
A hazardousarea MCC shelter may require positivepressure ventilation, gas detection, alarms, shutdown functions, firerated construction and suitable external electrical equipment The exact protection concept depends on the area classification, equipment installed inside and applicable project requirements
A standard MCC enclosure does not become suitable for Zone 1 or Zone 2 simply by adding a fan Pressurization and explosionprotection features must be treated as a coordinated system and verified under the required compliance basis
What Can Be Completed Before Delivery?
Factory prefabrication can include structural fabrication, coating, internal flooring, equipment supports, cable trays, openings, lighting, ventilation components and other agreed systems Work completed in the factory can reduce the amount of fabrication and assembly required at the project site
The delivery level is flexible Common scopes may include:
|
Delivery scope |
Typical content |
|
Prepared enclosure |
Structure, coating, flooring, openings and equipment supports |
|
Partially fitted module |
Prepared enclosure plus selected electrical, HVAC or safety systems |
|
Integrated MCC module |
Enclosure with project-defined equipment and systems installed and tested within the agreed scope |
These descriptions explain possible delivery levels; they are not fixed TLS packages Site foundations, external utilities, field connections and commissioning responsibilities remain subject to the project contract
Where Are MCC Enclosures Used?
Containerized MCC rooms can provide permanent or relocatable electricalcontrol space for oil and gas facilities, offshore platforms, chemical plants, energy projects, mines and remote industrial sites
FAQ
1. Is every TLS MCC enclosure pressurized?
No Pressurization is used when required by the installation environment and project protection concept
2. Does an MCC enclosure include the MCC panels?
It can, but not necessarily TLS can supply a prepared enclosure or support a more integrated delivery scope, depending on the contract
3. Can the layout be customized?
Yes Dimensions, cabinet arrangement, doors, cable entries, flooring, HVAC provisions and other interfaces can be configured for the project
4. Does a prefabricated MCC enclosure eliminate all site work?
No Prefabrication can reduce site work, but foundations, external connections, installation checks and commissioning may still be required
Conclusion
A TLS custom MCC enclosure is a configurable containerized space for MCC panels and related control equipment Its structure, coating, flooring, cable routes, environmental control and safety systems are selected for the actual application The product can range from a prepared enclosure to an integrated module, while hazardousarea and positivepressure features are included only when required by the project.
Product brochures:
This article evaluates the advanced "MCC Switchgear Pressurised Shelter Solution" designed for heavy-duty industrial, onshore, and offshore environments. By integrating custom-engineered shipping containers with active HVAC pressurization, specialized fire and gas detection, and robust structural compliance, TLS provides an all-in-one plug-and-play solution. This design protects sensitive, non-explosion-proof electrical equipment against harsh climates and hazardous gas atmospheres.
Key Questions Answered in This Guide
- What unique challenges do standard electrical switchgears face in offshore or hazardous environments?
- How do the standard and custom sizing metrics of TLS shelters accommodate complex site constraints?
- What specific structural codes and safety standards govern these localized equipment rooms?
- Why do past operational failures highlight the necessity of integrated turnkey engineering?
The Critical Role of Pressurized Electrical Shelters
In modern industrial landscapes—particularly in offshore oil platforms, maritime operations, and chemical processing facilities—protecting high-value electrical assets is a foundational safety mandate. Systems like Motor Control Centers (MCC), Switchgears, Motor Circuit Protection (MCP), Variable Frequency Drivers (VFD), and Variable Speed Drivers (VSD) form the backbone of field operations.
However, this sophisticated equipment is often non-explosion-proof. When deployed into environments with corrosive sea spray, extreme temperatures, or volatile ambient gases, unshielded electronics are prone to rapid degradation and catastrophic arc-flash triggers.
The "MCC Switchgear Pressurised Shelter Solution.pdf" addresses this vulnerability by housing components within a weather-resistant, walk-in containerized module. By maintaining a positive internal pressure gradient, the shelter mechanically prevents external hazardous gases and dust from infiltrating the clean electrical staging environment.
Technical Specifications and Dimensional Versatility
Engineering flexibility is crucial for adapting to variable deck spaces or onshore footprints. TLS builds its shelters around highly scalable, modular designs that can be altered based on equipment volume and site installation requirements.
The regular module dimensions feature standard configurations with uniform width profiles alongside variable heights (2591 mm or 2896 mm) to accommodate tall switchgear lineups:
- 15ft Module Dimensions: Length of 4572 mm, width of 2438 mm, and heights of either 2591 mm or 2896 mm.
- 20ft Module Dimensions: Length of 6058 mm, width of 2438 mm, and heights of either 2591 mm or 2896 mm.
- 40ft Module Dimensions: Length of 12096 mm, width of 2438 mm, and heights of either 2591 mm or 2896 mm.
Beyond these standard baselines, customized special sizes are frequently engineered to construct dedicated shelter rooms tailored for non-standard or oversized equipment configurations.
Standards, Applications, and Architectural Features
Target System Applications
The shelter operates as a centralized control hub capable of housing a diverse range of critical sub-systems:
- Medium Voltage (MV) and Low Voltage (LV) switchgears are arranged in fixed, compartmentalized, or withdrawable units.
- Centralized control panels incorporating Programmable Logic Controllers (PLC), MCC, and remote monitoring/operation infrastructure.
- Auxiliary field equipment essential to localized power distribution.
Safety and Structural Standards
To withstand aggressive physical handling and high-consequence operational zones, the architectural design complies with strict international benchmarks:
- Structural Integrity: Built in accordance with DNV2.7-1 and EN12079 structural design codes. The inclusion of dedicated ISO corner castings and integrated pad-eyes guarantees secure crane and vessel handling during onshore or offshore loading operations.
- Hazardous Zone: Certified for installation across Safe Areas, Zone 2, and Zone 1 hazardous environments.
- Electrical & Thermal Compliance: Complies strictly with the IEC60079-13 standard for pressurized room protection. Thermal and passive fire safety is reinforced with an A60-rated passive fire protection barrier.
Integrated Life Safety Features
Every module functions as an active safety device featuring an interconnected web of protection mechanisms:
- Environmental Controls: Heavy-duty HVAC systems paired with automatic, fail-safe fire dampers manage temperature and airflow.
- Monitoring Systems: A unified, combined pressurization fire and gas panel works continuously alongside dedicated fire and gas detection hardware.
- Personnel Security: Entryways are secured with specialized air-lock door systems to prevent pressure loss during entry/exit, while emergency egress is supported via a built-in escape hatch and onboard fire extinguishers.
- Infrastructure Utilities: Outfitted with baseline internal electrical cabling, high-visibility lighting systems, and utility sockets.
Key Performance Observations and Historical Lessons
Quantifiable Operational Metrics
Field assessments under harsh testing criteria demonstrate the efficiency of this integrated design approach. Comprehensive sea-worthy packing combined with standardized ISO dimensions minimizes transport friction across maritime and road freight channels. On-site deployment timelines indicate that the inclusion of plug-and-play plugin connections, backed by detailed installation manuals, reduces local installation overhead and configuration errors by significant margins when compared to traditional stick-built field rooms.
Aggregated Lessons from Industrial Failures
Historically, the decentralized procurement of individual system components (sourcing enclosures, HVAC, and fire panels from separate vendors) has led to systemic field integration failures. Industry data reveals several common failure modes that this all-in-one solution corrects:
- Loss of positive pressure containment due to misaligned door seals or uncoordinated HVAC pressure balancing.
- Delayed fire damper actuation caused by communication lag between third-party gas detectors and main control relays.
- Premature structural buckling or corrosion failure around lift points on non-certified containers during high-seas transfers.
By providing a single-source solution covering everything from initial structural fabrication to final system integration, TLS eliminates these multi-vendor incompatibilities.
Key Takeaways of the TLS Shelter Solution
- Comprehensive Protection: Protects standard, non-explosion-proof electronics from destructive external climates and hazardous vapors.
- Rigorous Certification: Built to satisfy DNV2.7-1, EN12079, A60 fire ratings, and IEC60079-13 international standards.
- Flexible Engineering: Available in standard 15ft, 20ft, and 40ft frames, as well as customized footprints tailored to specific project needs.
- Turnkey Delivery: Streamlines field deployment via integrated plugin interfaces and single-source design-to-fabrication quality control.
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
Keywords: #Pressurized electrical shelter, #DNV 2.7-1 switchgear container, #IEC 60079-13 compliance room, #Offshore MCC shelter solution, #Zone 1 hazardous area enclosure, #Containerized VFD shelter, #A60 fire rated module, #Motor Control Center blast shelter, #Plug and play electrical substation container, #Custom offshore switchgear housing
Written by Oliver
Offshore energy operations face severe financial and safety risks from equipment failure in volatile marine environments. TLS Pressurized MCC (Motor Control Center) Shelters mitigate these risks by using positive-pressure technology and IEC60079-13 compliance to protect critical electrical infrastructure. This article evaluates how pressurized enclosures prevent Zone 2 explosions, analyzes the industry-wide failure points of standard containers, and outlines the long-term ROI of specialized marine engineering.
Key Questions Addressed in This Article
To help you navigate this guide, we directly answer the following critical industry questions:
- What is a pressurized MCC shelter, and how does it prevent offshore explosions?
- Why is IEC60079-13 compliance a non-negotiable safety standard for Zone 2 locations?
- What are the typical operational and financial consequences of using standard industrial containers offshore?
- How do TLS shelters optimize thermal regulation and corrosion resistance compared to generic enclosures?
1. Defining the Pressurized MCC Shelter: The Physics of Protection
A pressurized Motor Control Center (MCC) shelter is a specialized, climate-controlled enclosure engineered to house switchgear, motor starters, and complex control systems.
Unlike standard industrial containers, these units utilize advanced HVAC systems to maintain a continuous positive pressure environment. By keeping the internal air pressure slightly higher than the external atmosphere, the shelter creates a literal one-way aerodynamic barrier.
This barrier effectively blocks:
- Flammable and hazardous gases
- Corrosive, salt-laden marine air
- Ambient moisture and humidity
In Zone 2 hazardous locations, this mechanical separation is the primary line of defense against catastrophic short circuits and catastrophic arc-flash explosions.
2. Industry Benchmark: The Critical Role of IEC60079-13 Compliance
Safety in offshore environments is dictated by strict international legal frameworks. TLS shelters are engineered and certified in full accordance with the IEC60079-13 standard, which governs the protection of equipment in hazardous areas via pressurized rooms.
Compliance with IEC60079-13 is not a legal formality—it is a foundational safety guarantee. If an external flammable gas leak occurs on an offshore platform, the strict pressure thresholds maintained by the TLS shelter ensure that the internal electrical components are completely isolated. Consequently, they cannot act as an ignition source, effectively securing the platform and protecting human life.
3. Industry Comparison: Standard Containers vs. TLS Pressurized Shelters
Deploying inadequate infrastructure offshore leads to rapid, costly operational failures. Reviewing common industry blind spots highlights the necessity of specialized engineering.
The Vulnerability of Generic Enclosures
Historically, the use of standard ISO containers or basic modified enclosures offshore has led to systemic reliability issues. Without positive pressure, standard seals inevitably degrade under constant marine exposure, allowing moisture, salt spray, and humidity to penetrate the hull. This ingress causes rapid pitting corrosion on switchgear components, leading to moisture-induced short circuits. Because unplanned downtime on an offshore rig can cost hundreds of thousands of dollars per day, these avoidable equipment failures represent an unsustainable financial and safety liability for operators.
The Solution: The TLS Performance Advantage
By contrast, TLS Pressurized Shelters are built from the ground up to endure the harshest elements through advanced material science:
- Corrosion Resistance: TLS utilizes marine-grade steel treated with specialized, multi-layer anti-corrosion coatings designed to resist relentless saltwater exposure for decades.
- Thermal Regulation Performance: Standard enclosures experience internal temperature spikes that degrade electronics. TLS integrates redundant, heavy-duty HVAC systems that maintain a stable internal climate, whether operating in the blistering heat of tropical zones or the freezing winds of Arctic waters.
- Structural Integrity: Engineered to withstand extreme wind loads and the high dynamic stresses experienced during offshore transport, heavy lifting, and marine installation.
4. Maximizing ROI: Operational Efficiency and Customization
While safety is the primary engineering driver, the economic benefits of TLS technology are equally decisive.
By providing an ultra-stable, clean, and climate-controlled environment for switchgear, these shelters significantly lower the frequency of preventative maintenance intervals. They drastically reduce the statistical probability of catastrophic equipment failure, ensuring continuous production.
Furthermore, TLS prioritizes flexible engineering. Every offshore asset features a unique footprint and rigid spatial constraints. TLS customizes internal layouts, structural dimensions, and component configurations to optimize spatial efficiency, allowing seamless integration into existing platform systems without sacrificing serviceability.
Key Takeaways
- Core Functionality: TLS shelters utilize positive pressure to create a flawless one-way barrier, preventing hazardous gases and salt air from compromising electrical components.
- Regulatory Standard: Full compliance with IEC60079-13 ensures absolute ignition protection within Zone 2 hazardous offshore locations.
- The Cost of Failure: Non-pressurized standard containers routinely suffer from moisture ingress and corrosion, leading to costly equipment failures and expensive unplanned downtime.
- Environmental Survival: Marine-grade construction and redundant HVAC systems guarantee continuous operation across extreme global temperature fluctuations.
- Strategic Value: Custom layouts optimize tight offshore footprints while delivering a high financial return through reduced maintenance and enhanced asset reliability.
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
Keywords: #Pressurized MCC Shelter, #Offshore Reliability #IEC60079-13 Standard, #Positive Pressure Environment, #Zone 2 Hazardous, #Switchgear Protection, #Marine-Grade Corrosion Resistance, #Offshore Asset Downtime, #Climate-Controlled Enclosure
