Abstract: Flare system is an important facility to ensure production safety and reduce environmental pollution of petrochemical plants. The design of flare system is related to the safety of plants. Safety is relative, and investment and safety are in unity of opposites. Reasonable determination of flare design load can save the investment and floor space and reduce the operation and maintenance costs under the premise of ensuring plant safety. This paper introduces the basic principle of determining the design load of flare system, the calculation method of relieving flowrate under different scenarios, and the ways to reduce the design load of flare in petrochemical plants, which has certain guiding significance for flare design of petrochemical plants.

Key words: petrochemical plant, operating mode, flare, design load, discharge