Ключевые слова: air, air valve, and, close up, control, danger, dirty, engineering, equipment, factory, faucet, handle, health, industrial, industry, isolated, isolated on white, isolation, isolation valve, lock, locked, machine, machine part, machine valve, metal, no people, occupation, occupational, occupational health and safety, off, oil industry, old, part, pipe, pipeline, pipetube, safety, safety equipment, steel, tag, tube, turn off, valve, warning, water,