Ключевые слова: aqueduct, blue, central, circulation, cloud, cloudy, conduit, coupling, cylinder, delivery, diameter, distribution, duct, elevated, equipment, europe, gas, heat, heatconducting, heating, hot, industrial, industry, infrastructure, insulating, iron, isolation, lag, lagging, large, line, metal, parallel, pipe, pipeline, piping, plumbing, sky, steel, supply, system, thermal, transmission, tube, two, ukraine, warm, warmth, water, watersupply,