... 3. A hot gas pipe, 0.3 m outside diameter, is covered with a layer of insulation (A),
0.025 m thick, and a layer of insulation (B), 0.04 m thick. The surface
temperature of the pipe it self was found to be 400 ºC when the outer surface of
layer (B) was 40 ºC. After an additional layer of insulation ...