The oil refinery explosion and fire that rocked Superior, Wis., in April could have been prevented if the plant's equipment had been properly maintained, a federal investigation has found.
The Occupational Safety and Health Administration levied an $83,150 fine for 13 violations including outdated safety procedures, failures to address certain hazards, and failed inspections and testing, among other problems.
"Ensuring the mechanical integrity of critical equipment used during the refinery shutdown operation could have prevented this incident," OSHA spokesman Mark Hysell said in a statement.
The explosion occurred while the refinery was shut down for maintenance.
The findings, delivered to Superior Refining Co. on Tuesday by OSHA's Eau Claire, Wis., office, come two months after the U.S. Chemical Safety and Hazardous Investigation Board said the massive explosion could have been caused by a worn valve that allowed air to leak and mix with combustible hydrocarbons.
One safety violation cited by OSHA dealt directly with the valve in question. The company didn't correct equipment deficiencies in a timely manner, including addressing the failure of what's called the "spent catalyst valve," according to OSHA.
A spokeswoman for Calgary-based Husky Energy Inc., which owns Superior Refining, said the company plans to meet with OSHA to discuss the findings.
"It is our policy to continuously improve our process safety programs. Superior Refining remains committed to this facility, our employees and the community," spokeswoman Kim Guttormson said in an e-mail.