2019 : Hazop evaluation and safety integrity level (SIL) analysis on steam system in ammonia plant Petrokimia Gresik Ltd.

Dr.Ir. Ali Musyafa M.Sc.


Steam is utilized to actuate 101 JT and 103 JT compressor turbines in the ammonia making process. Steam production is done through several processing steps in several units. HAZOP method and Safety Integrity Level (SIL) analysis is to observe the risk level using Fault Tree Analysis (FTA) method to calculate the security level of each node. The nodes used are deaerator, steam drum, and superheater burner. The hazard risk level is obtained from the multiplication of likelihood and consequence based on Petrokimia Gresik Ltd. standard. SIL value of the system is derived from the calculation of Probability Failure on Demand (PFD) total value in the Safety Instrumented System (SIS) arranged in each unit. Based on the analysis results, it was obtained that "high" of the hazard level occurred on steam drum with low level deviation and superheater burner with high pressure deviation. The PFD total value on the …