Ключевые слова: abstract, background, big, building, canalization, circle, circular, closeup, conduit, construction, corroded, corrosion, cylinder, design, different, duct, environment, heap, high angle, industrial, industry, iron, length, long, manufacture, manufacturing, many, material, metal, narrow, pattern, pipe, pipeline, piping, round, rust, rusty, shining, shiny, short, site, small, spread, stack, steel, structure, surface, tall, texture, tube,