The amount of sulfur dioxide and butadiene released were above environmental limits.
In-house fire brigade handled the blaze with no outside help.
The latest violations involve more than 6 tons of air pollutants released.
Video on social media shows workers fleeing from the flames.
At one point, flames covered a 1,000-square-meter area, city's mayor says.
A lengthy fire broke out Thursday afternoon in a process unit at the Phillips 66 oil refinery in Ponca City, Oklahoma, the Ponca City News reports.
ExxonMobil must comply with a subpoena issued by the U.S. Chemical Safety Board demanding information about containing hydrofluoric acid on the site of a 2015 oil refinery explosion in Torrance, California, the Ninth Circuit Court of Appeals ruled Monday.
Federal investigators believe a rupture pipe elbow was at fault in a June 2019 explosion and fire at the Philadelphia Energy Solutions refinery in Pennsylvania, according to the U.S. Chemical Safety Board.
Irony is defined as expressing one’s meaning by using language that normally signifies the opposite. For an example look no further than the recent Labor Day celebration in Philadelphia barely two months after an explosion and fire closed the Philadelphia Energy Solutions refinery complex.
Rather than race to the scene, Superior, Wisconsin, Fire Chief Steve Panger went straight to fire department headquarters when an April 26 refinery explosion rocked the community.
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