Ali Musyafa : Hazad And Operability Study and Analysis of Safety Integrity Level Case Study: Ammonia Refrigerant Compressor at Petrocemical Plant

Dr.Ir. Ali Musyafa M.Sc.



Published in

Advances in Natural and Applied Sciences


External link


Jurnal Internasional




On the refrigeration system at the Petrocemical Plant there ammonia refrigerant compressor 105 J that operating to raise the vapor pressure of ammonia that comes from the refrigerant drum 120 CF flush and keep the pressure on the refrigerant flush drum 120 CF in order to maintain their liquid ammonia product temperature at -33 C. To avoid the risks that occur in ammonia refrigerant compressor 105 J we perform the identification of potential Hazard that can occur in the process in ammonia refrigerant compressor 105 J by using Hazard and Operability Analysis (HAZOP) and SIL analysis. In this study determined four nodes consisting of ammonia refrigerant compressor stage 1 to 105 J ammonia refrigerant compressor 105 J stage 4. Based on the identification of 20 instruments are installed on all four nodes, the valve components, namely the level of 1024 which has a high risk based standards PT.Petrokimia Gresik. For Safety Integrity Level (SIL) value obtained from the calculation of Safety Instrumented System (SIS) in ammonia refrigerant compressor 105 J is NO SIL. With SIS Probability Failure Demand (PFD) worth 0.3 and RRF at 3:33. The recommendations on the level of risk reduction valve 1024 level by adding redundant generate failure rate is much lower at 4:45 x 10-10 and PFD total of 1.28 x 10-4 worth SIS SIL 2. The recommendations of the panel in the form of local turnover based relay into Programable Logic Control (PLC) generates total PFD total =0.038 worth SIL 1.