Oil Pipelines-News

   *Biggest rupture in Keystone pipeline history sent 14,000 barrels of oil gushing in Kansas
   *Line has been shut down since late Wednesday and timeline for a restart is unclear
   *Keystone carries 622,000 barrels of oil per day from Canada to US storage and refining hubs
   *Operator TC Energy and investigators remain mum on what may have caused the breach

The Keystone pipeline spill in a creek running through rural pastureland in Washington County, Kansas, about 150 miles northwest of Kansas City, also was the biggest in the system's history, according to U.S. Department of Transportation data. The operator, Canada-based TC Energy, said the pipeline that runs from Canada to Oklahoma lost about 14,000 barrels, or 588,000 gallons.

The spill raised questions for environmentalists and safety advocates about whether TC Energy should keep a federal government permit that has allowed the pressure inside parts of its Keystone system — including the stretch through Kansas — to exceed the typical maximum permitted levels. With Congress facing a potential debate on reauthorizing regulatory programs, the chair of a House subcommittee on pipeline safety took note of the spill Friday.

A U.S. Government Accountability Office report last year said there had been 22 previous spills along the Keystone system since it began operating in 2010, most of them on TC Energy property and fewer than 20 barrels. The total from those 22 events was a little less than 12,000 barrels, the report said.

The nearly 2,700-mile Keystone pipeline carries thick, Canadian tar-sands oil to refineries in Illinois, Oklahoma and Texas, with about 600,000 barrels moving per day from Canada to Cushing, Oklahoma. Concerns about spills fouling water helped spur opposition to a new, 1,200-mile Keystone XL pipeline, and the company pulled the plug last year after President Joe Biden canceled a permit for it.

Environmentalists said the heavier tar sands oil is not only more toxic than lighter crude but can sink in water instead of floating on top. Bill Caram, executive director of the advocacy Pipeline Safety Trust, said cleanup even sometimes can include scrubbing individual rocks in a creek bed.