Hydrogen as a gas presents several challenges when it leaks:
- Extremely flammable: Hydrogen has a wide flammability range (4% to 75% in air), making any leak a fire hazard.
- Invisible & odourless: Hydrogen leaks are not detectable by human senses, requiring specialised sensors for detection.
- Low ignition energy: Even a tiny spark can trigger an explosion in a hydrogen-rich environment.
- High diffusivity: It disperses rapidly but can accumulate in confined spaces, increasing risk.
- Material compatibility: Hydrogen can cause embrittlement in certain metals, leading to equipment failures.
- Regulatory compliance: Stringent safety standards necessitate careful controls and monitoring.
Failures in equipment, improper maintenance, and human error are common causes of hydrogen leaks. The consequences can be catastrophic, including severe injuries, property damage, environmental harm, and business downtime.