Norfolk Southern Corp. is continuing to defend its decision to burn off vinyl chloride monomer following a derailment in East Palestine, Ohio, in 2023, despite a National Transportation Safety Board finding that it was unnecessary.
Oxy Vinyls LP, the company that made the VCM in the tanker cars that derailed Feb. 3, 2023, says its expertise was not properly considered in the decision to burn off the material, a PVC feedstock.
In a statement to Plastics News, officials with Oxy Vinyls in Dallas thanked the NTSB and its investigators, but they added that "it's surprising to us that Norfolk Southern continues to challenge the results of a thorough government investigation led by the NTSB and supported by multiple federal agencies."
"We were shocked to learn that Oxy Vinyls' technical assessment and the temperature data collected by Norfolk Southern were not provided to the decision-makers," Oxy officials said. "It was Norfolk Southern's decision to direct the incident response communication flow and it was Norfolk Southern's choice not to inform the incident commander of Oxy Vinyls' data-based view that polymerization was not occurring."
A final meeting on the NTSB investigation of the Feb. 3, 2023 incident took place June 26 at East Palestine High School. At the meeting, investigators said the Investigators said the joint decision by the local incident commander, the railroad and railroad contractors to conduct a vent and burn of the contents of the tank cars carrying VCM — a PVC feedstock — was based on incomplete and misleading information from Norfolk Southern.
As a result, the vent and burnoff wasn't necessary to prevent a tank car failure, according to NTSB investigators. The burnoff led to clouds of black smoke that could be seen for miles.
At the meeting, NTSB investigator Paul Stancil provided most of the testimony about the decision to burn off the VCM. He said Oxy Vinyls, the petrochemicals firm that made the VCM being transported, "had no direct contact with the incident commander."
"There was a misunderstanding or confusion between Oxy Vinyls and Norfolk Southern and [NS] contractors," Stancil said. "The data [from Oxy] was not indicative of [VCM] polymerization."
The belief that the VCM was polymerizing and could have caused an explosion was a major factor in officials' decision to proceed with the burnoff on Feb. 6, three days after the derailment. NTSB investigators said June 25 that there was a low probability of polymerization, based on the data that Oxy Vinyls provided at the time of the derailment.
Investigators added that, according to the Federal Railroad Administration, a vent and burn procedure should be a last resort, used when a tank car is about to fail. They added that NS rejected three other removal methods and began planning for a vent and burn shortly after the derailment.
At the start of the meeting, NTSB Chair Jennifer Homendy said that "unfortunately, some have sought to minimize the wide-ranging impacts of this derailment, pointing to the fact that there were no fatalities or injuries."
"For this, we are certainly grateful, but the absence of a fatality or injury doesn't mean the presence of safety," she added. "Our agency doesn't wait for death or injury to occur. Instead, we objectively analyze the facts and evidence to make recommendations that, if implemented, will ensure this never happens again. Thanks to the hard work of our world-class investigators, we now have a road map to do just that."
As a result of the investigation, NTSB issued new safety recommendations to the state of Ohio, the Chlorine Institute, Norfolk Southern, the International Association of Fire Chiefs, the American Chemistry Council, Oxy Vinyls and several other agencies and trade organizations.