Ключевые слова: abstract, background, barrel, blue, building, business, chemical, chemistry, chimney, construction, energy, engineer, engineering, environment, equipment, factory, fuel, gas, industrial, industrialplant, industry, insulation, line, machine, manufacturing, metal, natural gas, oil, oilindustry, pairs, petrochemical, petroleum, pipe, pipeline, piping, plant, power, production, pump, refinery, resources, sky, stainless, steel, supply, technology, tube, valve, welding, worker,