Suppose that waste heat from a refinery is available for a chemical plant located 1.6 km away. The waste stream from the refinery consists of 1 standard cubic meter per second of corrosive gas at 150ºC and 3.5 MPa (abs). The refinery is located on one side of a highway with the chemical plant on the other side. To bring the waste heat to the chemical process, a pipe has to be laid underground and buried in the soil. The pipe is to be made of a material that can withstand corrosion. Select an appropriate material for the pipe and its insulation, and then estimate the heat loss from the gas between the source and the place of utilization as a function of insulating thickness for two different insulating materials. The velocity of the gas stream inside the pipe is of the order of 5 m/s and has a heat transfer coefficient of 100 W/m² K. As part of the assignment, outline any safety problems that need to be addressed with an insurance company in order to protect against a claim in case of an accident.

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Refinery 1.6 km Chemical plant