In the manufacturing and application of modular containers, offshore containers, and various functional enclosures, watertightness is a critical factor for ensuring the safety of both equipment and personnel. Watertight testing not only verifies a container’s resistance to water but also directly impacts its service life, equipment protection, and operational safety.

1. Purpose of Watertight Testing​
  • Prevent Equipment Damage from Water
Storage containers, control rooms, or laboratory containers often house sensitive electronic devices and high-value equipment. Watertight testing ensures that containers remain protected against rain, seawater splashes, or accidental water ingress, preventing potential damage.
  • Ensure Personnel Safety
For accommodation or office containers, poor watertightness can lead to water leakage inside, increasing risks of slips, falls, or electrical hazards.
  • Verify Design and Construction Quality
Watertight testing reflects the reliability of seals, doors, windows, interfaces, and overall welding workmanship. It serves as an essential checkpoint to confirm that design and construction meet expected standards.

2. Importance of Testing Timing
The timing of watertight tests directly affects the accuracy of results and overall container quality:
  • Mid-Production Testing
Conducting a preliminary watertight check once the container structure is largely assembled allows early detection of welding, seal installation, or interface issues. Adjustments or repairs at this stage are more cost-effective and help ensure a higher final product pass rate.
  • Final Pre-Delivery Testing
Performing the final watertight test after the container is fully completed, including installed internal equipment and pipelines, is crucial. This not only serves as a part of the quality assurance before shipment but also simulates real-world conditions the container may face in use.

3. Common Watertight Testing Methods
  • Hydrostatic Pressure Testing
Applying a controlled water pressure to check for leaks is suitable for assessing the overall watertight performance of a container.
  • Spray/Rain Simulation TestingSimulating natural rainfall or sea spray helps examine the sealing performance of doors, ventilation openings, and interfaces.
  • Combination of Visual and Instrumental Inspection
Using visual observation alongside instruments such as humidity sensors or leak detection paper can identify even minor water ingress with higher accuracy.

4. Key Considerations
  • Seal Material Inspection: Ensure that seals, flange connections, and welds are intact and undamaged.
  • Pre-Test Cleaning: Keep the container interior and exterior clean to avoid false leak detection.
  • Stage-by-Stage Documentation: Record each test result to track defect repairs and quality improvements.
  • Environmental Control: Water temperature, pressure, and testing duration should comply with design specifications to ensure reliable results.

5. Conclusion
​Watertight testing is a critical part of container quality assurance and an essential measure to protect both equipment and personnel. Proper scheduling of test timing, selecting the right testing methods, and strict adherence to standards can minimize leakage risks and enhance container reliability.

Through staged testing and final verification, manufacturers can ensure that every container delivered maintains reliable watertight performance in real-world 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.
 
Keywords:#Watertight testing,#Container safety,#Equipment protection,#Personnel safety,#Modular container,#Offshore container,#Leak detection,#Hydrostatic testing,#Seal inspection,#Quality assurance

Written by Snowy

In industries such as chemicals, energy storage, and offshore operations, both personnel safety and equipment reliability are top priorities. TLS pressurized explosion-proof containers are engineered with professional design and strict certifications to provide a dependable protection solution for high-risk sites.

1. Proven Safety with International Explosion-Proof Certifications
TLS container systems comply with major global and regional explosion-proof standards, including:
  • IECEx – A globally recognized certification ensuring safe equipment performance worldwide.
  • ATEX (EU) – Required for Zone 0/1/2 hazardous environments across Europe.
  • GB3836 (China) – National standards covering electrical safety and explosion-proof enclosures.
By meeting these certifications, TLS containers ensure that internal electrical devices, control cabinets, fans, and other critical components operate safely without creating sparks or heat sources that could trigger explosions.

2. Advanced Pressurized Enclosure Design
​TLS pressurized containers maintain a stable positive-pressure environment to prevent flammable or harmful gases from entering the enclosure. This ensures a safe working space for both personnel and sensitive equipment. Key design features include:
  • Pressure control system
    Maintains continuous and stable positive pressure to safeguard internal equipment.
  • High-performance sealing materials
    Corrosion-resistant, fire-resistant, and dust-tight to support long-term reliability.
  • Real-time monitoring & alarms
    Pressure and temperature are continuously monitored, with alarms triggered when abnormalities occur.

Design standards referenced include:
  • IEC/EN 60079 series (pressurized protection standards)
  • GB/T 3836.9 (China’s pressurized protection standard)
These containers are ideal for chemical plants, energy storage stations, and offshore platforms, ensuring long-term operational stability in hazardous environments.

3. Key Advantages of TLS Explosion-Proof Pressurized Containers
  • High safety & reliability
    Reduce explosion risks and protect both equipment and personnel.
  • Flexible customization
    Container size, internal layout, ventilation method, and pressure-control system can be tailored to project needs.
  • Built for challenging environments
    Suitable for multiple hazardous zones and extreme climates.
  • Full-cycle technical support
    From design and manufacturing to commissioning and after-sales service, TLS provides complete professional support.

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.

Keywords: #Explosion-proof container,#Pressurized enclosure,#Hazardous area solutions,#IECEx / ATEX certified,#Positive pressure system,#Offshore container module,#Chemical plant safety,#Energy storage protection,#Customized container design,#Hazardous zone equipment

Written by Snowy

​Are you working on an offshore or harsh-climate project and need to protect vital electrical equipment from hazardous environments? TLS Offshore Containers offers a robust and comprehensive solution with our  MCC/ Switchgear/ MCP / VFD/ VSD Pressurised Shelter Solution.

As a global leading supplier of containerized solutions, TLS can help you wherever you are in the world.

Why Choose a TLS Offshore Pressurised Shelter?
TLS switchgear, Motor Control Centre (MCC), Motor Circuit Protection (MCP), Variable Frequency Driver (VFD), and Variable Speed Driver (VSD) shelters are specifically designed to safeguard sensitive electronic controls and switchgear.

These shelter modules are built from containerized units to protect equipment from:
  • Harsh Climates
  • Gas Hazardous Atmospheres
This protection is especially crucial when the equipment itself is not explosion-proof. The shelter solution encloses the equipment in a weather-resistant container, allowing for walk-in operation.

Key Features and Compliance
The TLS shelter is designed for both onshore and offshore applications and can be rated for ZONE2/ZONE1 or a Safe area.

Structural and Design
  • DNV2.7-1/EN12079 structural design code compliance.
  • Containerized module equipped with ISO corners and pad-eyes, suitable for loading and unloading.
  • The modular and flexible design allows for diverse equipment requirements and site installation.
  • Available as Standard or customized ISO standard or DNV2.7-1 standard containers.
  • Common module sizes include:
         1. 10ft: L2991mm*W2438mm*H2896mm
         2. 16ft: L4876mm*W2438mm*H2896mm
         3. 20ft: L6058mm*W2438mm*H2896mm
         4. 40ft: L12192mm*W2438mm*H2896mm

Safety and Protection
The pressurised shelter adheres to IEC60079-13 standard compliance and includes critical safety features:
  • A60 passive fire protection
  • Combined pressurization fire & gas panel
  • Fire detection
  • Gas Detection
  • Automatic fire dampers
  • Fire extinguisher
  • Air-lock door system (fail-safe)
  • Escape hatch

Electrical and Utility
The shelter is fully equipped with essential utilities, making installation easy:
  • HVAC system
  • Basic electrical cabling
  • Lighting and sockets

Applications of the Shelter
The containerized solution is ideal for housing various critical equipment, offering a single-source solution from design to fabrication.

Typical applications include:
  • MV/LV switch gear in fixed, compartmentalized, and withdrawable units.
  • Control panels (e.g., PLC, MCC, remote operation, and monitoring).
  • Auxiliary equipment.

Ease of Installation and Transport
The shelter is designed for convenience, offering sea-worthy packing and easy transport by road and sea to better support overseas customers. The system features an easy plug-in connection with detailed onsite installation guidance.
 
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 pressurised mud logging cabin brochure
MCC | Switchgear | VFD | VSD pressurised shelter
 
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Keywords: #ZONE2 MCC shelter, #Offshore Pressurised Container, #DNV 2.7-1 MCC Shelter, #Containerized Switchgear Solution, #Hazardous Area Electrical Shelter, #VFD VSD Pressurised Shelter, #A60 Fire Rated Container, #IEC 60079-13 Compliant Shelter, #Motor Control Centre Container, #Customised Offshore Container

Written by Oliver