UPDATE 1-US considers flammability risk of Bakken crude after accidents

Thu Jan 2, 2014 3:05pm EST
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By Patrick Rucker

WASHINGTON Jan 2 (Reuters) - Crude oil produced in North Dakota may be more flammable and prone to explosions than earlier thought, U.S. officials said on Thursday as they examine whether gas trapped in crude-by-rail shipments could explain a spate of fiery accidents.

In the latest mishap involving fuel produced in an oil patch known as the Bakken, several tank cars exploded after a collision on a desolate stretch of North Dakota track on Monday.

In that case, as with several other accidents in recent months, tank cars exploded with a force that surprised investigators.

The incidents "indicate that the type of crude being transported from the Bakken region may be more flammable than traditional heavy crude oil," the U.S. Pipeline and Hazardous Material Safety Administration said on Thursday.

Officials are examining whether Bakken crude is unduly corrosive, more sulfurous or loaded with explosive gas as it moves on the tracks from oil fields to distant refineries.

On Thursday, Bakken producers were warned to "sufficiently degasify" crude oil being loaded onto tank cars, and officials said they will examine the "dissolved gas content" of crude oil shipments.

Packing gas onto tank cars meant to carry liquid fuels can push the pressure to dangerous levels and provoke explosions, industry officials have said.   Continued...