A 30 m long pipe with an external diameter of 75mm is being used to convey steam at a rate of 1000 kg/h. The steam pressure is XXXXXXXXXXkPa. The steam enters the pipe with a dryness fraction of 0.98...

A 30 m long pipe with an external diameter of 75mm is being used to convey steam at a rate of 1000 kg/h. The steam pressure is 198.53 kPa. The steam enters the pipe with a dryness fraction of 0.98 and must leave the other end of the pipe with a minimum dryness fraction of 0.95. Insulation with a thermal conductivity of 0.2 W/(m K) is available. Determine the minimum thickness of insulation necessary. The outside surface temperature of insulation is assumed to be 25°C. Neglect the conductive resistance of the pipe material and assume no pressure drop across the pipe.