In a chemical plant, a hydrogen (H2) explosion occurred in an empty 100-m³ tank of sulphuric acid (H2SO4). Built in 1973, this storage container was lifted 5 cm, yet its anchorages were able to resist the blast. The tank was repaired by installing an angle bracket type of reinforcement at the level of the bottom/shell junction and replacing the 4 threaded anchorage pins. This accident could not be accurately dated. A similar accident in 2009 would once again implicate this same tank (ARIA 36628).