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The company said in February that a faulty weld in the bend caused a crack that grew over time under stress. The report concluded that TC Energy underestimated the risks associated with the bend going from its round shape when installed to a more-restricted oval shape within two years and didn’t replace the bend after excavating it in 2013. The report raised questions about Canada-based TC Energy’s oversight of the manufacturing of its pipeline, saying the report’s authors could find no record of a pre-installation inspection of the welds on the pipeline bend in Washington County, Kansas.

Department of Transportation’s Pipelines and Hazardous Materials Safety Administration posted a redacted copy of the report online Monday, about three weeks after it was completed by RSI Pipeline Solutions, based in the Columbus, Ohio, area.

government regulators.Īn engineering consulting firm said in the report that the bend in the Keystone system where the December 2022 spill occurred had been “overstressed” since its installation in December 2010 - likely because construction activity itself altered the land around the pipe. (AP) - Pipeline design issues, lapses by its operators and problems caused during its construction led to a massive oil spill on the Keystone pipeline system in northeastern Kansas, according to a report for U.S. Business & Finance Click to expand menu.