Ключевые слова: abstract, background, barrel, black, blue, business, chemical, closeup, concept, connection, construction, design, energy, engineer, equipment, factory, fuel, gas, illustration, industrial, light, line, machine, manufacturing, metal, oil, old, pipe, pipeline, plant, plastic, plumbing, power, pressure, process, production, pump, red, round, steel, structure, supply, technical, technology, tube, valve, water, white, work, worker,