Analysis of Hazard Level And Protection Layer on Induced Draft Fan Using Layer of Protection Analysis (LOPA)

Induced draft fan (ID fan) plays crucial function in the steam power generation plant process. However, as with any process, there is always the potential for danger, which can result in significant losses. Therefore, it is essential to have a reliable control and safety system in place, as well as a thorough protection layer analysis, to mitigate such risks. The type of independent protection layer (IPL) and safety integrity level (SIL) needed for the induced draft fan are determined using the LOPA analysis approach. This involves evaluating the severity and likelihood of potential hazardous scenarios based on the hazard and operability (HAZOP) analysis. Independent protection layer (IPL) analysis is applied to determine likelihood values for each event-triggered protection layer. The HAZOP analysis results reveal the presence of risks in the ID fan system, which are classified into three risk ranking categories. The low-risk category accounts for 12.5% of the total, the medium-risk category represents 62.5%, and the extreme-risk category comprises 25%. The safety integrity level (SIL) for impact events 1 through 6 was assessed using the layer of protection analysis (LOPA) methodology, and it was determined to be SIL 1. This meets company standards as the current layer of protection has been successful in mitigating all impacts. This study improves the understanding of hazard levels within ID fan systems and provides recommendations for improving reliability and protective coatings. The results of this research may be used in development of safety and security policies in industries using identification ID Fan.