Ключевые слова: aqueduct, bending, central, circulation, cloudy, conduit, coupling, cylinder, diameter, duct, elevated, equipment, gas, heat, heat conducting, heating, hot, industrial, industry, infrastructure, insulating, iron, isolation, lag, lagging, large, metal, parallel, pipe, pipeline, piping, plumbing, rust, rusty, sky, steel, supply, system, thermal, transmission, tube, two, water, water supply,