Ключевые слова: blue, chemical, chemicalworker, cock, connecting, construction, distillery, energy, engineer, engineering, factory, fuel, heavy, industrial, industrialplant, industry, line, liquid, metal, oil, oilrefinery, petrochemical, pipelines, pipes, piping, plant, pollution, power, refinery, resources, shine, stainless, steel, technology, toxic, toxicsubstance, tube, water, wide,