Installs, repairs, and replaces piping and fittings for oil, natural gas, water, steam, compressed air, heating and plumbing lines, and systems for equipment such as steam turbines, air compressors, pumps, and boilers. + Repairs and overhauls pumps and heat exchangers; removes and replaces coils, and replaces valves and associated equipment on steam turbines, steam distribution systems, boilers, and other related systems and equipment.