OSHA Highlights Safety Concerns That Put Workers at Risk of Explosion at US Steel Plant

A federal safety agency is investigating a tragic explosion at a U.S. Steel plant near Pittsburgh that resulted in the deaths of two workers. The incident occurred in August while employees were flushing a gas valve, leading to a series of findings that highlighted significant safety lapses.

The Occupational Safety and Health Administration (OSHA) has since fined U.S. Steel a total of $118,214, issuing 10 citations related to the incident. In addition to the fatalities, the blast injured 11 others, including contractors, as reported by the Chemical Safety Board, which is also conducting an investigation.

Prior to this explosion, Clairton Coke Works had a documented history of accidents and explosions. Current and former employees have voiced concerns about poor management and a lack of investment, which they believe have worsened air pollution and compromised workplace safety. Investigative reports from Pittsburgh’s Public Source and The Associated Press have corroborated these claims.

According to U.S. Steel, the explosion occurred during routine maintenance when workers were flushing a gas valve at the facility, the largest of its kind in the Western Hemisphere. OSHA reported that the valve ruptured, releasing combustible coke oven gas into the environment.

In a detailed 16-page report released on Monday, OSHA identified that U.S. Steel’s written procedures, practices, and training related to the safe maintenance of equipment and gas valve flushing were incomplete, outdated, or inadequate. These deficiencies, the agency noted, “exposed” employees to the risk of an explosion when the valve failed. Furthermore, another citation indicated that U.S. Steel did not provide necessary records within the required timeframe following the explosion.

In response to the findings, U.S. Steel stated that it is currently reviewing the OSHA report but did not clarify whether it agrees or disagrees with the conclusions or if it plans to contest them. The company emphasized its commitment to safety as a core value that shapes its workplace culture.

OSHA has set deadlines for U.S. Steel to address the identified shortcomings. The agency allows companies to contest findings through an informal conference. Bernie Hall, the district director for the United Steelworkers, expressed gratitude to OSHA for its thorough investigation into the incident, which claimed two lives and affected many others. He stated, “We are dedicated to working with management to implement OSHA’s recommendations—especially those that incorporate process safety management—and continue our mission to make our workplaces safer.”

The Chemical Safety Board has confirmed that its investigation is ongoing. Kurt Barshick, U.S. Steel’s vice president of the Mon Valley Works, revealed during an October presentation that workers had trapped “3,000 PSI water inside of a valve that’s rated for 50 PSI.” This pressure caused the valve to crack, resulting in gas filling the area.

This explosion is just one of many incidents at the Clairton plant, which has a long history of legal disputes with Allegheny County regulators over environmental compliance issues.

Photo: A portion of the Clairton Coke Works, a U.S. Steel plant, is seen Monday, Aug. 11, 2025 in Clairton, Pa. (AP Photo/Gene J. Puskar)

Copyright 2026 Associated Press. All rights reserved. This material may not be published, broadcast, rewritten, or redistributed.

Topics
USA
Workers’ Compensation

A federal safety agency is investigating a tragic explosion at a U.S. Steel plant near Pittsburgh that resulted in the deaths of two workers. The incident occurred in August while employees were flushing a gas valve, leading to a series of findings that highlighted significant safety lapses.

The Occupational Safety and Health Administration (OSHA) has since fined U.S. Steel a total of $118,214, issuing 10 citations related to the incident. In addition to the fatalities, the blast injured 11 others, including contractors, as reported by the Chemical Safety Board, which is also conducting an investigation.

Prior to this explosion, Clairton Coke Works had a documented history of accidents and explosions. Current and former employees have voiced concerns about poor management and a lack of investment, which they believe have worsened air pollution and compromised workplace safety. Investigative reports from Pittsburgh’s Public Source and The Associated Press have corroborated these claims.

According to U.S. Steel, the explosion occurred during routine maintenance when workers were flushing a gas valve at the facility, the largest of its kind in the Western Hemisphere. OSHA reported that the valve ruptured, releasing combustible coke oven gas into the environment.

In a detailed 16-page report released on Monday, OSHA identified that U.S. Steel’s written procedures, practices, and training related to the safe maintenance of equipment and gas valve flushing were incomplete, outdated, or inadequate. These deficiencies, the agency noted, “exposed” employees to the risk of an explosion when the valve failed. Furthermore, another citation indicated that U.S. Steel did not provide necessary records within the required timeframe following the explosion.

In response to the findings, U.S. Steel stated that it is currently reviewing the OSHA report but did not clarify whether it agrees or disagrees with the conclusions or if it plans to contest them. The company emphasized its commitment to safety as a core value that shapes its workplace culture.

OSHA has set deadlines for U.S. Steel to address the identified shortcomings. The agency allows companies to contest findings through an informal conference. Bernie Hall, the district director for the United Steelworkers, expressed gratitude to OSHA for its thorough investigation into the incident, which claimed two lives and affected many others. He stated, “We are dedicated to working with management to implement OSHA’s recommendations—especially those that incorporate process safety management—and continue our mission to make our workplaces safer.”

The Chemical Safety Board has confirmed that its investigation is ongoing. Kurt Barshick, U.S. Steel’s vice president of the Mon Valley Works, revealed during an October presentation that workers had trapped “3,000 PSI water inside of a valve that’s rated for 50 PSI.” This pressure caused the valve to crack, resulting in gas filling the area.

This explosion is just one of many incidents at the Clairton plant, which has a long history of legal disputes with Allegheny County regulators over environmental compliance issues.

Photo: A portion of the Clairton Coke Works, a U.S. Steel plant, is seen Monday, Aug. 11, 2025 in Clairton, Pa. (AP Photo/Gene J. Puskar)

Copyright 2026 Associated Press. All rights reserved. This material may not be published, broadcast, rewritten, or redistributed.

Topics
USA
Workers’ Compensation