Calculate the rate of heat loss per foot and the thermal resistance for a 15-cm schedule 40 steel pipe covered with a 7.5-cm-thick layer of 85% magnesia. Superheated steam at 150ºC flows inside the pipe (h̅_c = 170 W/ (m² K)), and still air at 16ºC is on the outside (h̅_c = 30 W/(m² K)).

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Insulation Steel pipe. Superheated steam T = 150°C Still air T = 16°C