How deciding not to fix a pipe in Kansas 10 years ago led to the Keystone pipeline's biggest...

The Keystone was built with extra safety measures, yet it split open under run-of-the-mill pressure levels that less rigorously designed pipelines regularly withstand.
Independent investigators paint a very different picture from what oil company TC Energy has said publicly about events that led to the Keystone pipeline’s biggest oil spill ever.

Their report says, for instance, that the company dug up the section of pipe nearly a decade before it burst because it knew the pipe had warped. Yet it reburied the spot without fixing it.

The consultants’ 240-page report also sheds light on how the Keystone — with its beefed up safety features that won it a special federal permit to operate at high stress levels — burst open in Kansas last year while operating under much less pressure than it was designed for.