SIL study is usual practice in the Chemical and Oil & Gas industries. Nowadays, SIL studies are being applied to power plants by Owners. IEC 61511 standard requires a safety life cycle (divided into three phases analysis phase, implementation phase and Operation/ Maintenance phase). In the analysis phase, a SIL workshop is carried out to identify the required integrity levels based on Health/Safety, Environmental and Financial considerations using the IEC SIL Risk Assessment Matrix (Normally, the Risk graph method is followed in Power Projects). All the participants (Owner, EPCs, OEMs and other O&M teams) must have appropriate skills to understand and share their experience to arrive at the required SIL level of Safety Instrument function (SIF). This case study covers the number of SIL loops for a typical Combined cycle power plant, Mitigation measures, Inputs requirements and the SIL achieved for the High high-level trip. The following power plants are taken into consideration

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