A fatigue crack in the Keystone Pipeline led to an oil spill in North Dakota earlier this year that released thousands of barrels of oil onto farmland, according to the pipeline operator.
In a quarterly report released Thursday, South Bow said initial findings show, “the failure resulted from a fatigue crack that originated along the pipe’s manufactured long-seam weld.” A fatigue crack develops from stress over time. A mechanical and metallurgical analysis found the pipe and welds met industry standards, the company said.
