Ключевые слова: background, blue, building, business, circle, circuit, concrete, connect, construction, control wheel, electricity, energy, engine, equipment, factory, gas, gate valve, heat, industrial, industry, infrastructure, iron, line, metal, modern, oil, outdoor, pipe, pipeline, plumbing pressure, power, pressure, pump, rust, safety, screw, security, stack, steam, steel, steel tube, storage, supply, system, technology, tube, valve, wall, water, water company,