Ключевые слова: background, barrel, blue, business, concrete, design, energy, engineer, engineering, equipment, factory, fuel, gas, illustration, industrial, industrial plant, industry, insulation, line, machine, manufacturing, metal, oil industry, pairs, pipe, pipeline, piping, plant, power, pressure, production, pump, refinery, resources, shine, sky, stainless, steel, supply, tube, valve, welding, worker, workshop,