With the first crash and explosion of a unit train of tar sands oil in Canada in February, we learned that the conventional wisdom among people covering the oil-by-rail industry regarding the flammability of tar sands oil has been dead wrong. A second derailment and explosion on March 7th involved synbit, which is a form of bitumen diluted with synthetic crude oil.
While there are many examples of this mischaracterization of the dangers of moving tar sands by rail that can be found in the press, here at DeSmogBlog we didn’t have to look far. In an article last year about how to make Bakken crude less dangerous we wrote that the government had plans to allow tar sands oil to be transported in the unsafe DOT-111 rail tank cars “because it is not explosive.”
While raw bitumen from the Alberta tar sands is not volatile or highly flammable, when it is diluted with natural gas condensate to form a mixture known as dilbit, which is typically done to make it easier to transport, it appears that it can be as dangerous as the Bakken crude that has now been proven to be highly flammable and explosive in multiple train derailments.
An article in Railway Age pointing out the implications of the tar-sands-by-rail accident had the ominous title “Why bitumen isn’t necessarily safer than Bakken” and concluded with the statement that “Should TSB [Transportation Safety Board] conclude that dilbit has a volatility similar to Bakken crude, as the Alberta research suggests, the hazmat classification of crude oil could be in question.”