A leak occurs on a hydrogen gas transport at a flange of 9 cylinders of 80 m. The producer of these cylinders decides to let it leak. No consequences to report.

In a hydrodesulfurization unit of a refinery, a leak on a hydrogen line ignited and damaged the surrounding lines, including one with acid gas. The weather conditions (fog and very little wind) raised fears of poisoning for the personnel of the units. The fire, however, was located and did not destroy vital lines.

A leak occurred in a vehicle carrying 218 cylinders of hydrogen. The contents of 28 cylinders, 90 m of hydrogen, escaped. A security perimeter was set up with stop of the road and rail traffic.

Leakage of a mixture of hydrogen, nitrogen, citric, hydrofluoric and hydrogen sulfide occurs during ventilation shutdown on high temperature PVC furnaces. The accident follows an electrical outage related to the failure of a general circuit breaker during the switchover by the electricity providers from the emergency power supply to the main power supply.

In an ammonia production unit, a 350-bar leakage of synthesis gas (ammonia + hydrogen) occurred in the compressor room. The leak was the result of the failure of a weld on a line (2") at the outlet of the compressor. A flammable cloud formed in the room (15 m x 105 m), 30 to 45 s later.

A tank receives, after a negative reactivity test with the bottom supernatant of the tank, 20 m of methyl hydro-dichloro-silane, then 24 m of a mixture of oil and tar (negative reactivity test) and 10 m of a Tar mixture (no reactivity test). Simultaneously, the operator feeds an oven by pumping into the tank. A reaction appears 24 hours after these discharges, filters clog up, the tank overflows, then the reaction stops. The management states that there is no danger; 15 days later a sudden release of hydrogen occurs with a projection of solid polymer within a radius of 25 m.

In a chlorine manufacturing unit, an explosion occurs in the room of the electrolysis cells. The accident occurs during the start-up phase of the unit, it is due to the presence of hydrogen in the chlorine collector of the cells. An amperage error (2000 A instead of 0) during the initiation phase is at the origin of the presence of this gas.The collector was destroyed and the chlorine spread in the workshop. The month, day and place of the accident are not specified.

In a chemical plant , a process gas leak (4% ammonia and 88% hydrogen) occurs during a purge operation. The cloud of gas ignites and explodes. An employee is killed.

In a chemical plant, a 1750 m tank containing an ammoniac solution explodes. The anchorage of the was ripped, the tank lifted on one side and crashed against the retention wall, which was partially destroyed. 1000 m of solution (10-20% NH3) was discharged; the stream destroyed another part of the retaining wall at the opposite side and contaminated the surroundings. Four people were slightly intoxicated (inhalations).The presence of an explosive atmosphere consisting of an air-NH3 / H2 / CH4 mixture was strongly suspected.

Follow a leak in a seal of a heat exchanger (metal-covered asbestos) a fire occurred in a reforming process. The hydrogen-rich mixture caused spontaneous inflammation. The fire lasted 30 minutes. The accident followed a series of various start / stops. An annealing treatment had to be carried out on 2 points that had been watered during the incident.