A heating unit at a Petrobras depot used to treat fuel for ocean-going ships exploded. The blast and resulting fire broke out while workers were doing planned maintenance on the heating unit.

Proximate causes:
• Inadequate work planning

Source: A web-based collection and analysis of process safety incidents (https://www.sciencedirect.com/science/article/abs/pii/S0950423016302285)
Image Credit: Reuters