Overview
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
  1. What unique challenges do standard electrical switchgears face in offshore or hazardous environments?
  2. How do the standard and custom sizing metrics of TLS shelters accommodate complex site constraints?
  3. What specific structural codes and safety standards govern these localized equipment rooms?
  4. 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