A 50 mm diameter pipe of circular cross section and with walls 3 mm thick is covered with two concentric layers of lagging, the inner layer having a thickness of 25 mm and a thermal conductivity of 0.08 W/m-K, and the outer layer a thickness of 40mm and a thermal conductivity of 0.040 W/m-K. What is the rate of heat loss per metre length of pipe if the temperature inside the pipe is 550K and the outside surface temperature is 330K? A. 62.7 W/m B. 74.7 W/m C. 82.5 W/m D. 98.3 Wlm

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