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This paper will demonstrate best practices and lesson learned in implementing the customized HAZOP/LOPA standards to support process hazard analysis through a systemic risk assessment of the potential hazards and examine the consequence scenario associated with aging production facilities in Rokan Block. The study output supported Process Safety Management (PSM) program to manage and update critical safeguards dashboard which referred to production facility high consequence scenario. Risk Management team had established risk management process and procedures to manage HES risks related to facilities and projects. Process Hazard Analysis (PHA) is a systematic assessment of the potential hazards associated with industrial process. A finding about the documentation quality of consequence and safeguards that was inconsistent in the baseline PHA reports resulted challenges to confirm whether appropriate safeguards are in place and effective to mitigate HES consequences. A HAZOP methodology was majority used to perform PHA for the existing production facilities. Risk Management team developed and implemented a PHA guidance checklist to address quality gaps in risk management studies. This guidance assisted facilitators to apply HAZOP with customized LOPA methodology, as opposed to a HAZOP study only. The customized version is compatible for facilities with the potential severe or catastrophic consequences and for lower consequence facilities which risk mitigation measures may not be easily identified. The customized HAZOP/LOPA implementation has provided a better platform to understand and measure operational risk for aging facilities which require clarity around determination of Risk Reduction Factor Credit (RRFC) for various safeguards, Independent Protection layer (IPL) and enabling events / conditional modifiers. The approach has reduced drastically subjectivity in determining �likelihood / severity� which affects to final risk rank of PHA study through focusing more on taking credit from engineered safeguards instead of administrative and human safeguards. The results are accommodated into periodic update of PSM Critical Safeguard Dashboard.