Ключевые слова: background, building, business, conduit, construction, energy, engineering, environment, equipment, factory, fuel, gas, gasoline, heavy, industrial, installation, iron, line, machinery, manufacturing, metal, oil, pipe, pipeline, plant, power, production, refinery, repair, safety, site, sky, slinger, steel, storage, structure, supply, technology, transportation, tube, unloading, water, work, worker,