On December 10, 2005, Tank 912 at the Buncefield Oil Storage Depot in Hertfordshire, England, was filling with gasoline. According to a report by the European Process Safety Centre, the tank had two forms of level control: a gauge enabling personnel to monitor the filling operation; and an independent high-level switch (IHLS) which was meant to shut down operations automatically if the tank was overfilled. The first gauge stuck and the IHLS was inoperable, so there was no means to alert the control room staff that the tank was filling to dangerous levels. Eventually, large quantities of gasoline overflowed from the top of the tank. A bund retaining wall around the tank…
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