Risk Analysis of steam generation at the 5th refinery of South Pars Gas Company using HAZOP procedures

چکیده مقاله

considering HSE management program in its strategic framework, and employing integrated methods and tools commonly employed in a chemical process plant, a hazard risk assessments at the steam generation unit was investigated in an Iranian South Pars gas refinery, using PHA-PRO6 software. Recommendations were made to improve safety and prevent possible hazards, taking into account several years of production experiences, past maintenances and reported accidents and near misses. Implicating safety improvements by adopting recommendation yielded from HAZOP studies is expected to reduce system risks and enhance its reliability. The main process hazards identified include water flow fluctuation, pump failures and excess pressure leading to pipe failures, condensation at compensating steam outlets, leakage, substandard maintenance practices, deviations in control of pH, oxygen content, corrosion, condensed water entrapment, were identified as some of the major sources of risks involved. These were considered in constitution of the risk matrix, from which main recommendations and execution time needed are produced. Using the available techniques and standards as well as installing flow control devices could ensure maintaining a normal operating pressure which will in turn, reduce pump stoppage and the unit being out of service due to water shortage. Starting-up procedure for the unit was also revised based on the results of this study. The need for regular (annual) inspection of instrumentation controls especially solenoids and check valves were also emphasized. To avoid reverse flow of water into the boilers, installation of a check valve before HV 213 was recommended.