Emergency pressure relief is a protective measure to release/control the pressure in case of an emergency, i.e. when the pressure becomes higher than the design pressure of e.g. a reactor. The design is based on the pressure generation in a reaction system and the physical nature of the discharged material. Required input data are e.g. density, specific heat, vapour pressure, vaporisation heat, kinetics, (decomposition) reaction heats, molecular weights, etc See also: Specialized Software