37 Construction of civil engineering structures for the power generation, sand and aggregate materials, cement manufacturing, port loading, industrial manufacturing, oil and gas, pulp and paper processing, chemical processing, and sugar production industries; Construction consultation in the field of civil engineering structures for the power generation, sand and aggregate materials, cement manufacturing, port loading, industrial manufacturing, oil and gas, pulp and paper processing, chemical processing, and sugar production industries; Construction, maintenance and renovation of real property civil engineering structures for the power generation, sand and aggregate materials, cement manufacturing, port loading, industrial manufacturing, oil and gas, pulp and paper processing, chemical processing, and sugar production industries; Installation, maintenance, and repair of pressure parts, steam line parts, valve replacements parts, pressure vessel parts, duct work parts, soot blowers parts, unit parts, panel parts, air reheater parts, grate parts, port rodder parts, and structural repairs of industrial boilers