Oil in North Dakota Derailment Was Treated to Cut Volatility

A shipment of oil involved in an explosive train derailment in North Dakota had been treated to reduce its volatility — a move that state officials suggested could have reduced the severity of the accident but won't prevent others from occurring.

Hess Corporation spokesman John Roper said the oil complied with a state order requiring propane, butane and other volatile gases to be stripped out of crude before it's transported. That conditioning process lowers the vapor pressure of the oil, reducing the chances of an explosive ignition during a crash.

Despite the treatment of the crude in Wednesday's accident, six cars carrying a combined 180,000 gallons of oil caught fire in the derailment 2 miles from the town of small Heimdal in central North Dakota. The town was evacuated but no one was hurt.

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