A steel pipe of 100 mm bore and 7 mm thickness carrying steam at 260C is insulated with 40 mm of a moulded high-temperature diatomaceous earth covering, which is in turn insulated with 60 mm of asbestos felt. The atmospheric temperature is 15C. The heat transfer coefficient for the inside and outside surfaces are 550 and 15 W/mK, respectively. The thermal conductivities of steel, diatomaceous earth, and asbestos are 50, 0.09, and 0.07 W/mK, respectively. Calculate; (i) The rate of heat loss by the steam per unit length of the pipe. (116.4 W) (ii) The temperature of the outside surface. (22.86C)