A steam pipe (k=45W/mC) having 70mm inside diameter and 85mm outside diameter is lagged with two insulation layers; the layer in contact with the pipe is 35mm asbestos (k=0.15W/mC) and it is covered with 25mm thick magnesia insulation (k= 0.075W/mC ). The heat transfer coefficients for the inside and outside surfaces are 220 W/m2C and 6.5W/m2C respectively. If the temperature of steam is 350C and the ambient temperature is 30C, calculate: a) The steady loss of heat for 50m length of the pipe; b) The overall heat transfer coefficients based on inside and outside surfaces of the lagged steam main. With best wishes