The Keystone crude oil pipeline will restart at reduced pressure on Tuesday, TransCanada Corp ( TRP.TO ) said, nearly two weeks after closing the line after it leaked 5,000 barrels of crude in rural South Dakota.  Calgary-based TransCanada shut down the 590,000 barrel-per-day pipeline, one of Canada’s main crude export routes linking Alberta’s oil fields to U.S. refineries, on Nov. 16. The company is still cleaning up the spill and investigating the cause. TransCanada said on Monday the U.S. Pipeline and Hazardous Materials Safety Administration (PHMSA) reviewed its repair and restart plans. It said it will start operating the […]