Ключевые слова: blue, bolted, closeup, complex, control, distribution, energy, engineering, engineering background, equipment, factory, fittings, flow, fluid, gas, handle, heavy, industrial, industrial background, industrial equipment, industrial plant, infrastructure, machinery, maintenance, manual, metal, metallic, network, oil, oil and gas industry, operation, petrochemical, petrochemical industry, pipeline, pipeline system, pipes, pressure, red, safety, secure, supply, system, technology, turning, utilities, valve handle, valves, water, water supply, wheel,