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A steel pipe carrying saturated steam at 4000 kpa, is 304.8 mm OD. The pipe is...

A steel pipe carrying saturated steam at 4000 kpa, is 304.8 mm OD. The pipe is 150 m long. Temp outside the pipe is 18 degrees C. It is insulated with formed insulation with thermal conductivity of 0.023 W/m/K. If the design is to allow for condensation of 80 kg of steam per hour, how thick must the insulation be?

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