 There have also been at least three documented cases of non-lethal explosions or fires breaking out at the refinery.On the morning of December 8, 2009 an accident caused an explosion in the hydrogen unit run by Praxair Inc. No one was injured.In early June 2012, after two fires erupted and a heater broke, workers noticed that caustic vapors had leaked out of a tank and caused widespread accelerated corrosion of pipes and equipment.]