A pipe of outer diameter 50mm. maintained at 1100K. is covered with 50mm of insulation of thermal conductivity 0.17 watts per meter per Kelvin. Would it be feasible to use a magnesia insulation which will not stand temperatures above 615K and has a thermal conductivity of 0.09 watts per meter per Kelvin for an additional layer thick enough to reduce the outer surface temperature to 370K in surroundings at 280K? Take the surface coefficient of heat transfer by radiation and convection as 10 watts per sq. meter per Kelvin. (Hint: Determine the temperature at the interface of the pipe and insulation to compare with the given threshold)