Total Petrochemical & Refining USA said there has been gas emissions from its Port Arthur refinery.
The incident happened after a sudden surge of acid gas.
In a filing with the Texas Commission on Environmental Quality, the company said: “Units 865 and 866 were slumped (reduced) to allow the acid gas from the surge to be processed at Units 870 and 875.”
The 225,000 barrel a day refinery is located around 100 miles east of Houston.