Ключевые слова: background, big, circle, closeup, collector, connection, construction, energy, engineering, equipment, factory, fuel, gas, gasoline, heat, heavy, industrial, industry, inspection, iron, line, machine, machinery, metal, natural, oil, old, pipe, pipeline, piping, plumber, power, pressure, pump, red, rusty, safety, steam, steel, supply, system, technology, temperature, transportation, tube, valve, water, wheel, work,