
Photo:AFP
UPDATE: Between the effects of the explosion, fire, and water put aboard in firefighting the Shoko Maru subsequently sank.
The 2,242 DWT Japanese product tanker, Shoko Maru, exploded and caught fire Thursday morning, local time, while anchored about 5 kilometers off the port of Himeji in western Japan. The ship had recently finished discharging a cargo of heating oil. Seven of the eight ship’s crew escaped, although four were reported to be seriously burned. The rest were treated for lesser injuries. One person, reported to be the ship’s 64-year-old captain, is still missing.
It may at first seem counter-intuitive, but an empty tanker is far more likely to explode than a loaded tanker. While an empty tanker does not contain significant oil, the oil vapors left in the tanks when mixed with oxygen can form an explosive mixture which, if ignited by a spark, can go off like a bomb. There were unconfirmed reports that a sailor was using a grinder on deck just before the explosion. If this turns out to be accurate, a spark from the grinder may have set off the explosion.