Hydrogen leak occurred during a delivery of hydrogen at an automotive supplier. Rescue deployed a curtain of water and evacuated 82 employees from several companies within a radius of 50 m. The hydrogen installation was then purged. The intervention ended at 4 hours later. The accident was caused by a rupture of a connection element (lyre) between the hydrogen bottle in the delivery truck and the receiving tank.

In a pharmaceutical company classified Seveso upper-tier establishment, a deflagration occurs at the end of a hydrogenation reaction involving a chemical raw material, acetic acid, water and a catalyst: palladium. The operator was performing hydrogen purges, consisting in sending hydrogen under pressure into the reactor via the hydrogen vent. he heard a thud and observed a light above the hydrogen vent, at the bell of the flame breaker. He triggered the emergency stop and started the emergency plan. The staff was evacuated and the other facilities on site secured.

The hydrogen jet fire a pipe have been detected by a night operator which was making rounds in a solvent production unit. The unit's emergency response team managed the fire in minutes. Operators stopped the flow of hydrogen by closing a valve. The hydrogen network was purged with nitrogen.The unit has three reactors, out of which only one was in operation at the time of the incident.

In a chemical plant, an explosion occurred on the primary reformer of an ammonia manufacturing unit.

A hydrogen leakage occurred in the ammonia workshop of a plant manufacturing nitrogen products and fertilizer (classified SEVESO high threshold). It was detected by an operator in charge of safety checks, by the noise and by his portable gas detector. After confirming the leak, the operator stopped the piping (30 bar) to repair it. The ammonia workshop was also partially shut down. The operator closed the section at the origin of the leak by installing a threaded and welded plug.The leak was due to corrosion under insulation on a DN50 dead arm: a 90 elbow punctured on DN400 piping.

In the acid treatment room of a Seveso low-threshold hazardous waste treatment centre, an explosion occurred on a 250 m concrete tank containing acid sludge being neutralized. The explosion occurred when the employee left the room and cut off the lighting of the building. The building was evacuated. The employee, severely burned, was transported to the hospital. Firefighters intervened. The concentration close to tank ceiling was 80% of the LFL. The operator filled the tank with water. The next day, the concentration was less than 10% of the LFL.The upper hatch of the tank was torn off.

The explosion occurred when an operator opened a valve on the hydrogen network of the plant. The operator suffered from a burn in the forearm and two other employees are shocked by the pressure wave. The three victims were taken to the hospital for exams. The involved gas network was purged.

At around 5.45 am, an explosion occurred at an oil refining plant. The operating units of the hydrogen compressors are stopped. Around 8:45, firefighters master the fire. 11 people are taken to hospital with bruises or dust inhalation.In November 2004, two employees died following a leak followed by a fire on this site.

Around 13:45, a hydrogen leak on a pipe occurred in a refinery. Cold cutting of a purge was underway on the equipment as part of a work stoppage. The worker, who detected the leak, stopped the air saw and gave an alert. The installation was safe. The thousand employees presented was confined. A solid buffer was set up to isolate the section concerned by the leak.An error in identifying the location of the blowdown purge caused the event.

A hydrogen skid was placed into service in a nuclear power plant, outside the controlled area. This skid, like seven others, was located in a gas cylinder storage facility. It was supplied by several hydrogen cylinders at a pressure of 200 bar. As its pressure was rising, a trap on the skid was blown off, causing the hydrogen to leak and ignite. The flaming jet measured 40 cm and continued as the system was open. Surprised by the incident, an employee fell and slightly injured his arm.