A makeshift switch on a sandblasting unit apparently set off an explosion of gasoline vapors killing a worker who was cleaning a petroleum storage tank. The victim had recently been promoted to foreman. His first assignment was to clean and seal several petroleum tanks. He had taken care of the other tanks without incident, and was preparing to sandblast the interior of the final one. He had taken a reading of the oxygen content and volatile gases content after the tank was cleaned the previous day. He proceeded to enter the tank to perform the sandblasting. A pump was still in the […]