CNBC | Harvey shuts down largest US oil refinery, bears down on Louisiana plants CNBC The largest U.S. oil refinery began shutting down on Wednesday as Tropical Storm Harvey continued to batter southern Texas and made another landfall on the Gulf Coast, threatening a stretch of the refining hub in Louisiana. Oil market analysts ... Nation's largest oil refinery forced to shut down as Harvey floods Port Arthur The nation's largest oil refinery shuts down as Hurricane Harvey floods Texas Harvey's Impact on Oil Markets Shown Through Charts |