Ключевые слова: background, blue, business, chemical, connection, construction, control, energy, engineering, environment, equipment, factory, fuel, gas, heat, hose, industrial, line, machine, manufacturing, metal, middle, natural, oil, pipeline, pipes, plant, plumber, plumbing, power, pressure, processing, pump, red, refinery, row, safety, security, stainless, steam, steel, structure, supply, system, tank, technology, tube, valve, water,