Petroleum refineries are a maze of distillation plants, furnaces, reactor units, heat exchangers, tanks, boilers, cooling towers – all interwoven by a network of pipelines, valves, wires, ducts, and pumps. One enormous structure common to many refineries is a catalytic cracking unit (or “cat cracker”) which distills crude oil into gasoline using high temperature heat exchangers, boilers, heaters and pumps. For years, these structures were treated with high temperature resistant asbestos insulation, gaskets, packing material, and other asbestos building products. Cat crackers and other refinery structures became especially dangerous work sites during routine maintenance shutdowns or “turnarounds,” when asbestos materials were torn out and disturbed, exposing workers, contractors, and their family members. Workers at refineries, especially during the 1940s through 1970s, were at substantial risk of exposure to asbestos, and should now be exploring their legal options.