Ключевые слова: 3d, background, bolt, button, chemical, conduit, connection, construction, control, drain, element, engineering, equipment, factory, faucet, flange, fuel, gas, gasoline, icon, illustration, industrial, industry, isolated, isometric, metal, natural, object, oil, petroleum, pink, pipe, pipeline, piping, plumbing, power, pressure, pump, sign, silver, square, steel, symbol, system, tap, technology, tube, valve, water,