Abstract: Under the premise of considering the characteristics of compressible fluids and the system pressure, temperature, and piping characteristics, the model equation presented in this paper are used to calculate the emergency releasing case of recycle gas in EO/EG plant which reaches the speed of sound, and the results are consistent with the actual test conditions in the field. It can be applied to the piping design and check under emergency venting conditions in other EO/EG plants or similar systems to meet the specific safety requirements. At the same time, the relationship between release time and release volume under different release pressures is also studied.

Key words: compressible fluid, release, model calculation