Abstract: n chemical plant, different grades of chilled water are commonly used for heat transfer, and the required chilled water can be obtained by the continuous refrigeration of chiller. For chillers using propane (R290) as the refrigerant, the discharge of pressure relief valve (PRV) of chiller should be sent to the flare system of plant, if flare system is available, to reduce the risk because propane is highly dangerous liquid hydrocarbon. It is very important to standardize the design of chiller so that the discharge of PRV can meet the design requirements of the flare system

Key words: propane, refrigerant, chiller, pressure relief valve, flare system