The U.S. Chemical Safety Board (CSB) released its findings and a safety bulletin entitled "Key Lessons for Preventing Incidents when Preparing Process Equipment for Maintenance" resulting from a hydrocarbon release and fire that injured one worker at the Delaware City Refining Company in Delaware City, DE. CSB Chairperson Vanessa Allen Sutherland said, "More than a third of the incidents investigated by the CSB occurred during maintenance activities, ultimately resulting in 86 fatalities and 410 injuries." On November 29, 2015, alkylation unit operators at the Delaware City Refining Company, or DCRC, were preparing equipment for maintenance. Prior to performing the work, operators had to first drain and isolate a section of piping scheduled to be replaced by closing valves to block the flow of hydrocarbons into the piping. However, the operators learned that a valve on one side of the pipe isolation was leaking and therefore would not seal properly, which led...