Application of a Hazard Operability Study to Hazard Evaluation of a Chemical Unit of the Power Station

摘要

Introduction: Today, Hazard and Operability Study (HAZOP) is recognized as one of the most accurate multi specialist team approaches for determining risks and hazards. It is applied in various industries including refineries, petrochemical, metallurgies, pharmaceutical and chemical industries. Material & Methods: This technique was used to recognize the hazards and problems of operations on the chemical section at power station and then evaluate important risk factors. In this study, 126 deviations were recognized with various causes and consequences. Results: Ranking and evaluation of identified risks indicate that the majority of deviations were categorized as "acceptable" and less than half of that were "unacceptable". The highest calculated risk level (1B) related to both the interruption of acid entry to the discharge pumps and an increased density of the acid. About 27% of the deviations had the lowest risk level (4B). Conclusion: In conclusion, HAZOP can be considered as an effective method for recognition and prediction of hazards on chemical unit of power plants. This technique, therefore, may increase the safety levels, prevent accidents and increase the reliability of systems via the reduction of operational problems. Key words: Hazard and Operability, HAZOP, Risk assessment, Chemical Unit