He said crude should flow at normal rates once the pipeline is restarted, although the company may have to make up some volume in November. The shutdown comes amid delays over TransCanada's plans to build a $7 billion pipeline called the Keystone XL that would transport heavy tar-sands crude oil from Canada to Texas' Gulf Coast refineries. Opponents warn the new pipeline would be carrying heavy, acidic crude oil that could more easily corrode a metal pipe and lead to a spill. TransCanada says its pipeline would be the safest ever built.