t1 2) hot steam pipe (k-47 W/m C) has an inside and outside diameter of 8 cm and 19 cm is covered with a 9-cm layer +3 of insulation having k=0.5 W/m C, followed by a 4-cm layer of insulation having k-0.25W/m C. If the inner surface wall temperature is 250 C and the outside temperature of the insulation is 20 C. Calculate the heat lost per I m length