Why is FAT essential for pressure containers?
In industrial projects, pressurized containers are critical components of explosion-proof control systems. Before these containers are deployed on-site, it is crucial to verify their functionality, safety, and reliability under real operational conditions. Factory Acceptance Testing (FAT) addresses this need by ensuring the vessel performs safely and efficiently from day one.

1. What is FAT and why does it matter?

FAT is not just a checklist—it is a proactive safety validation. It ensures:
  • Critical electrical systems operate reliably
  • Positive pressure and airflow are maintained
  • Safety alarms and emergency systems function correctly
  • Equipment withstands extreme environmental conditions
Key takeaway: FAT confirms the vessel is ready for safe, real-world operation.

2. Visual Inspection: The first defense

The FAT process starts with a thorough visual check of all components:
  • Control & emergency systems: Explosion-proof CPFG control box, emergency stops, gas detectors (H₂S, combustible gas), smoke/temperature sensors, and fire alarms
  • Pressure components: Differential pressure transmitters and gauges correctly connected
  • Emergency equipment: Alarms, extinguishers, lighting, and stop mechanisms
  • Electrical wiring & grounding: Proper insulation and sealed cable entries
  • Sealing & labeling: Pressurized compartments clearly marked to ensure safe operation
Why it matters: Early detection of installation errors or potential hazards reduces risk before powering up.

3. Electrical Integrity Checks: Safety first

  • Insulation resistance tests confirm all electrical components are protected against short circuits or leaks
  • Power checks ensure CPFG control boxes, PLCs, and touchscreens receive proper voltage and respond correctly
  • Core benefit: Reliable electrical systems are the foundation for safe vessel operation.

4. System Interface & Operation Testing: Usability matters

  • Verify screen navigation, debugging mode, and alarm display
  • Ensure commands are executed accurately and promptly
Purpose: Operators must have clear, intuitive control over the system for quick response in emergencies.

5. Functional Testing: Confirm real-world performance

  • Normal & bypass operation: Test switching between operational modes
  • Alarm simulation: Trigger gas, H₂S, and fire alarms to ensure proper system response
  • Fan & airflow checks: Verify fans maintain positive pressure and adjust automatically
  • Emergency shutdown: Simulate critical failures to confirm safe power cutoff
  • Sensor integrity: Test responses to disconnected or faulty sensors
Why it’s critical: This step validates the vessel’s actual performance under realistic conditions.

6. Conclusion: FAT ensures peace of mind

Successful FAT means the pressure vessel is ready for deployment:
  • Provides a stable and safe operating environment
  • Reduces the risk of system failure on-site
  • Ensures emergency and alarm systems work as intended
  • Complies with all relevant safety standards

Bottom line: FAT is the final checkpoint before your pressure vessel goes live, guaranteeing reliable, safe operation in the field.

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.

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Written by Snowy