Abstract: Cracking furnace covers a large area with high structure and has many high temperature and high pressure pipelines. Taking an ethane cracking to ethylene project as an example, this paper briefly introduces the process flow, important equipment types and horizontal and vertical layout of ethylene cracking furnace, and discusses the principles of equipment layout and platform setting. The process properties, layout scheme, stress calculation and key points and difficulties in support and hanger setting of the material system, cracking system, steam water system, sewage system and fuel system are analyzed. The piping layout of cracking furnace should be planned reasonably, and the characteristics of piping system, flexibility of piping, operation and maintenance should be considered comprehensively.

Key words: ethylene cracking furnace, high temperature and high pressure pipeline, piping design