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On February 16, 2007, a propane fire erupted at the Valero McKee Refinery in Sunray, Texas, north of Amarillo. Three employees and a contractor suffered serious burns, and the refinery was forced to shut down. The fire began following a leak in the propane deasphalting unit and spread quickly, in part because of the rapid collapse of a major pipe rack carrying flammable hydrocarbons. Some of the rack's support columns had not been fireproofed.