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Machines and machine tools used in the production and refining of petrochemicals and petroleum products; engines except for land vehicles; machine coupling except for land vehicles and parts therefor; chemical and petroleum distillation and refinery apparatus for distilling and refining chemicals and oils and appurtenant power plant and equipment, oil burners, oil heating apparatus, heat exchangers, distillation column, flash evaporation tanks, condensers, steam generators, and structural parts therefor

Chemical and petroleum distillation and refinery apparatus and power plant equipment, namely, oil heaters and parts thereof, heat exchangers, condensers, steam generators, steam ejectors, delayed coking units and structural parts therefor