What happened

A feed buffer vessel in the diesel hydrotreating unit overpressurised, exploded and caught fire after high-pressure process material flowed backward through failed or insufficient isolation following a compressor and pump trip. Two people were killed and one lightly injured. China’s Ministry of Emergency Management identified the failed check valve, absence of emergency pump-outlet isolation and delayed manual intervention as key direct factors.

When cited sources give different casualty, damage or spill figures for this event, they’re reported side by side above rather than merged into one number. See how confidence levels work.