Fire hazards of transformer hydrocarbon pool fires

Oil-filled electrical transformers present a critical fire risk due to hydrocarbon pool fires. In the event of a leak or failure, the flammable dielectric oil can accumulate in concrete pits beneath transformers. If this oil comes into contact with a heat source or a spark, an intense fire can ignite. This type of fire, known as a pool fire, is particularly dangerous due to its ability to spread rapidly and cause severe damage to electrical installations and the environment.

Technological innovation in fire prevention: EXTICOV®-CCF™ and EXTICOV®-LHD® systems

The EXTICOV®-CCF™ and EXTICOV®-LHD® solutions are specifically designed for concrete pits to address these risks:

EXTICOV®-CCF™ (fire dampers)

These single-slope dampers, using SONEC technology, are installed above concrete pits to effectively direct burning hydrocarbons to the bottom of the pit. They prevent flames from spreading while channeling fluids in a controlled manner.

EXTICOV®-LHD® (fire-suffocating grating)

These robust gratings, based on PcP technology, are designed for demanding environments. Installed above concrete pits, they allow hydrocarbons to quickly enter the pit while blocking oxygen supply, which instantly suffocates the fire.

Advantages of EXTICOV® systems

Unlike traditional solutions using gravel and stones, which were previously used in concrete pits to mitigate fire risks, the EXTICOV® systems offer several advantages:

• Immediate response: Burning hydrocarbons are directly directed or filtered to the bottom of the pit, eliminating the risk of surface accumulation and sustained fire feeding.
• Effective fire suppression: The dampers and gratings prevent oxygen supply, instantly stopping combustion and limiting fire spread.
• Anti-slip surface and low maintenance: The EXTICOV® solutions eliminate the need for regular replacement or cleaning of materials such as contaminated gravel or stones. Besides their fire protection efficiency, EXTICOV®-CCF™ and EXTICOV®-LHD® provide a clean, anti-slip surface when installed above concrete pits. This feature improves operator safety by reducing slip hazards while ensuring a more functional and easy-to-maintain working environment. These durable and robust surfaces also support heavy loads (500 daN/m² as standard for EXTICOV®-LHD®), ensuring reliable use in demanding conditions.
• Enhanced safety: These systems provide a passive and reliable fire management solution, reducing risks for transformers and surrounding installations.
• Environmental and regulatory compliance: Pits equipped with EXTICOV® ensure better hydrocarbon management and strict compliance with safety and environmental regulations.

Thanks to these advanced technologies, concrete pits equipped with EXTICOV® systems provide efficient passive fire protection while simplifying risk management and offering increased durability.