Ключевые слова: background, building, business, concept, connection, construction, control, design, drain, electrical, electricity, energy, engineering, equipment, factory, fuel, gas, heat, illustration, indicator, industrial, industry, interior, line, manufacturing, metal, object, oil, pipe, pipeline, pipes, piping, plant, plumbing, power, pressure, production, pump, station, steam, steel, system, technology, temperature, tube, valve, water, white, work,