This industry comprises establishments primarily responsible for the construction (including new work, additions, alterations, maintenance, and repairs) of industrial buildings (except warehouses). The construction of selected additional structures, whose production processes are similar to those for industrial buildings (e.g., incinerators, cement plants, blast furnaces, and similar nonbuilding structures), is included in this industry. Included in this industry are industrial building general contractors, industrial building operative builders, industrial building design-build firms, and industrial building construction management firms. Constructing oil refineries and petrochemical plant--are classified in Industry 237120, Oil and Gas Pipeline and Related Structures Construction; Constructing water treatment plants, sewage treatment plants, and pumping stations for water and sewer systems--are classified in Industry 237110, Water and Sewer Line and Related Structures Construction; Constructing power generation plants (except hydroelectric)--are classified in Industry 237130, Power and Communication Line and Related Structures Construction; Constructing industrial warehouses--are classified in Industry 236220, Commercial and Institutional Building Construction; and Performing specialized construction work on industrial buildings, generally on a subcontract basis--are classified in Subsector 238, Specialty Trade Contractors.