An explosion occurred caused by a leak of hydrogen from a reactor on a fertilizer plant. The blast hurled the head of a hydrogen gas converter 150m and sent it crashing through reinforced-concrete beams in a warehouse roof. The factory supplied hydrochloric acid, ammonium sulphate and urea to other plants. Damage estimated at approximately, 1 million. (1985).

A jet fire occurred on the ammonia production unit, caused by a leak on a hydrogen pipe. No victims.

The vent occurred in the ammonia production unit. A minor leak had been detected in a flange on the piping of the ammonia synthesis loop (operating at 250 bar). The company called a specialized external contractor to perform an on-stream repair of the valve. This solution was chosen because of for the limited extents of the leakage and the economic costs and efforts associated to a shut-down of a very complex system.

The accident occurred during the maintenance of a sulfuric acid storage tank in an industry for the fertilizers production. The maintenance works consisted in cutting operations (to remove some plates fastened with bolts) by using oxyacetilenic flame on the storage tankOn the internal surface of a tank containing sulfuric acid a corrosion phenomenon associated with the accumulation of hydrogen occurred owing to poor maintenance. The hydrogen was then ignited by the oxyacetylenic flame.

The explosion occurred in the compressors unit of the plant. Witnesses reported a cloud of yellow smoke and a fire ball at its bottom. This first event has been followed by a fire fed by a hydrogen pipe (5.5 of gaseous hydrogen were present in the system). The fire brigade confined it until its natural extinction.A negligible amount of ammonia has been probably released to the environment.

A release of a mixture of hydrogen, nitrogen and ammonia ignited and exploded in the ammonia synthesis unit. The release occurred on a flange of the heat exchanger. and was due to a crack on the pipe.The gas mix consisted in 69% of hydrogen, 23% of nitrogen and 8% of ammonia.