Abstract: After introducing the importance of inlet and outlet insulation for radiant coils in ethylene cracking furnaces, this article starts from the factors that must be considered during the insulation design for inlet and outlet of radiant coils, introduces a variety of methods for inlet and outlet insulation from the aspects of material selection, structural design, detail design and construction precautions, summarizes the scope of application, advantages and disadvantages of each type of inlet and outlet insulation, and presents the development trend of inlet and outlet insulation technologies for radiant coils.

Key words: cracking furnace , radiant coil , inlet and outlet insulation