The finding rebuts one concern raised by opponents of the controversial 1,700-mile Canada-to-Texas pipeline. They have long argued that pipelines are more prone to corrosion and leaks if they carry diluted bitumen, the tar-like substance extracted in Alberta mostly by strip-mining, mixed with chemicals and pumped at high pressure through pipeline networks to refineries.
The National Research Council study did "not find any causes of pipeline failure unique to the transportation of diluted bitumen." The study was done at the behest of the Transportation Department.
Keystone XL's critics have contended that pipelines carrying diluted bitumen are more susceptible to leaks because they operate at a higher temperature, increasing the risk of a rupture from external corrosion. But the study found that diluted bitumen "is moved through pipelines in a manner similar to other crude oils with respect to the flow rate, pressure and operating temperature."
Further, the study said that diluted bitumen did not contain higher concentrations of substances like water and sediment that could increase the chances of internal corrosion.
Keystone XL's owner, TransCanada, welcomed the study's results.
"The public has been bombarded with misinformation about the oil that will go through Keystone XL," said Vern Meier, vice-president of pipeline safety and compliance at TransCanada. "Oil is oil, and the pipelines we build will safely move different blends -- as the industry has been doing for decades."
Keystone XL's critics highlighted what they considered the limits of the study. The National Research Council expert committee did not conduct its own testing of pipelines, for example. Instead, it relied on interviews with industry experts, academics and environmentalists, a review of other studies and fact-finding trips to Alberta.
The study examined Canadian and American government accident reports for pipeline leaks, but the information in them was "insufficient to draw definitive conclusions," the study found. The government databases lacked enough specificity about pipeline accidents to determine if transporting diluted bitumen played a role in leaks, according to the report.
Finally, the report did not address whether spills of diluted bitumen are harder to clean up than spills of conventional crude oil. If the Keystone XL pipeline gets the federal permit it needs for construction, it would carry up to 800,000 barrels of oil a day across the land that lies above the Ogallala Aquifer, the main source of drinking water for much of the Great Plains.
Cleanup continues of diluted bitumen that spilled three years ago into Michigan's Kalamazoo River. In late March, a pipeline ruptured in Mayflower, Ark., gushing 200,000 gallons through a residential neighborhood and into a nearby lake. So far, somewhat more than half the oil spilled there has been recovered.
The Michigan and Arkansas accidents remind "us again that this material is very difficult to remove from water bodies and raise questions about its short- and long-term effects on the health of the people exposed to it after a pipeline failure," said Carl Weimer, executive director of the Pipeline Safety Trust, a watchdog group based in Bellingham.
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