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Published on 04/12/23
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A huge explosion occurred approximately 20 minutes after a small quantity of sodium dichloroisocyanurate (C3CI2N3NaO3 or “SDIC”) was spilled onto a pile of off-specification ammonium nitrate (NH4NO3 or “AN”) which had been stored in Shed 221 for recycling. The blast was equivalent to a magnitude 3.4 earthquake on the Richter scale (20-120 tonnes of AN detonated). Much of the plant was destroyed and significant escalation occurred. The basic cause was probably either chemical incompatibility or major electrical failure in an adjacent storage area (exact cause not determined).
Ask yourself and your crew:
- How can something like this happen here (e.g. on our site)?
- What safety measures (i.e. procedures, controls/barriers) do we have in place to mitigate the risk?
- How do we know the risk controls/barriers are working?
- What improvements or changes should we make to the procedures, controls/barriers or the way we work?
Original content courtesy of IChemE Safety Centre
