37
Building construction; repair; installation services
industrial maintenance turnaround services, namely, scheduled repair and maintenance of equipment and machinery in the oil and gas, petrochemical, chemical, power, and refinery industries; specialty field maintenance services, namely, maintenance of industrial equipment and machinery in the oil and gas, petrochemical, chemical, power, and refinery industries; turnaround services, namely, maintenance, repair installation and replacement of industrial equipment and machinery in the oil and gas, petrochemical, chemical, power, and refinery industries; cleaning of industrial equipment and machinery in the oil and gas, petrochemical, chemical, power, and refinery industries; heat exchanger repair services; restoration of industrial equipment and machinery in the oil and gas, petrochemical, chemical, power, and refinery industries; demolition services, namely, demolition of industrial plants; catalyst changeout services, namely, replacement of catalyst machinery in the oil and gas, petrochemical, chemical, power, and refinery industries; coatings application services; heat transfer equipment services, namely, maintenance and repair; industrial bolting services, namely, installation and maintenance of bolts for industrial equipment and machinery; tower and drum services, namely, repairs, maintenance, inspection and repair of refining and petrochemical towers and drums; bundle extraction, namely, extraction of heat exchanger bundles; blind to blind services, namely, blind flange replacement and removal; crane and rigging services, namely, lifting and transportation of heavy loads in the oil and gas, petrochemical, chemical, power, and refinery industries; consulting services in the field of industrial turnarounds, namely, advising on matters related to the scheduled repair and maintenance of equipment and machinery in the oil and gas, petrochemical, chemical, power, and refinery industries
40
Treatment of materials
custom piping fabrication and beveling services; custom fabrication of equipment and machinery in the oil and gas, petrochemical, chemical, power, and refinery industries; custom industrial fabrication services, namely, fabrication of equipment and machinery in the oil and gas, petrochemical, chemical, power, and refinery industries; industrial welding services; field machining services, namely, on-site machining of industrial equipment parts for others; pipe cutting and beveling services; turning and milling services, namely, industrial equipment parts; bolting services; fireproofing services, namely, fireproofing of industrial equipment and machinery in the oil and gas, petrochemical, chemical, power, and refinery industries; acid proofing services namely, acid proofing of industrial equipment and machinery in the oil and gas, petrochemical, chemical, power, and refinery industries; demolition services, not buildings
42
Scientific and technological services and research and design relating thereto; industrial analysis and research services; design and development of computer hardware and software
industrial inspection of equipment and machinery in the oil and gas, petrochemical, chemical, power, and refinery industries; hydrotesting of equipment and machinery in the oil and gas, petrochemical, chemical, power, and refinery industries; calibration services; mechanical engineering services