Abstract
The purpose of risk assessment (RA) is the determination of quantitative or qualitative value of risk related to a concrete situation and a recognized hazard. The results of them are used for preventing occupational and process accidents. For the workplace in the chemical process industries (petroleum refinery, petroleum chemical, chemical, etc.), we summaries three types of RA methods (chemical RA, plant facility RA, work safety and health RA) which contributes to prevention of occupational and process accident, and the targets and purposes of each RA method which is implemented at each stage of plant lifecycle engineering. To perform RA and consideration and implementation of risk control adequately and to share the process safety information can make it possible to prevent the occupational and process accident from occurring and mitigate the damage.
