A steel pipe having 10 cm bore and 12 cm outside diameter carries hot water at 80° C when the surrounding temperature is 15° C. The thermal conductivity of pipe material is 54 W/mK and inner and outer heat transfer coefficients are 1 kW/m2 K and 9 W/m2K, respectively. Calculate the heat loss per meter length of the pipe and the surface temperatures. Also calculate the heat loss and the surface temperatures when the pipe is covered with a 4 cm thick insulation having thermal conductivity of 0.048 W/mK with outer surface heat transfer coefficient reduced to 7 W/m2K.