Question: A stainless steel pipe (k = 15 W/m-C) of length l = 10 m, inner diameter di = 0.5 m, and outer diameter do = 0.6 m is coated with an insulation material (ki = 0.0001 W/m-C) to allow a total heat loss of q = 10 W when the outdoor temperature is -5°C and the temperature of the fluid inside the pipe is 30°C. What is the thickness of the insulating layer?