A study of 261 accidents involving domino effect has been carried out. The main features have been analyzed: origin, causes, consequences and most frequent sequences. The analysis has shown that the most frequent causes are external events (31%) and mechanical failure (30%). The storage areas (37%) and process plants (27%) are by far the most common places where domino accidents have occurred. The most common sequence in the event trees resulted to be explosion-fire (21%), followed by release-fire-explosion (15%) and fire-explosion (14%).
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