(Solution Download) A steel pipe of 100 mm bore and 7 mm wall thickness, carrying steam at 260°C, is insulated with 40..


A steel pipe of 100 mm bore and 7 mm wall thickness, carrying steam at 260°C, is insulated with 40 mmof a high temperature diatomaceous earth covering. This covering is in turn insulated with 60 mm ofasbestos felt. If the atmospheric temperature is 15°C, calculate the rate at which heat is lost by thesteam per m length of the pipe. The heat transfer co-efficients for the inside and outside surfaces are550 and 15 W/m2 K, respectively and the thermal conductivities of steel, diatomaceous earth and asbestosfelt are 50, 10.09 and 0.07 W/m K respectively. Calculate also the temperature of the outside surface.

 







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