From Design to Decommissioning: Integrating Inherent Safety Principles in Nigeria's Midstream and Downstream Petroleum Operations

Abstract Nigeria's midstream and downstream petroleum sector continues to face recurring process safety incidents characterized by loss of containment events, asset failures attributable to aging infrastructure, and emergency responses to scenarios that were foreseeable at the design stage. The predominant safety paradigm across this sector remains reactive, emphasizing procedural controls, add-on engineered safeguards, and emergency response capability rather than the systematic elimination or reduction of hazards inherent to the process. This paper addresses a critical and underexploited dimension of process safety management: the integration of inherent safety (IS) principles across the full asset lifecycle, from conceptual design through to decommissioning. Drawing on the four core IS strategies—Minimize, Substitute, Moderate, and Simplify—this paper develops a structured seven-phase lifecycle framework that maps IS interventions across the Concept, Design, Construction and Fabrication, Pre-commissioning/Commissioning, Operations, Maintenance/MOC, and Decommissioning phases of asset development and operation. The framework is evaluated against industry-representative scenarios including liquefied petroleum gas (LPG) storage, gas processing, and pipeline systems, with semi-quantitative risk assessment illustrating the risk reduction achievable through deliberate IS integration. Results demonstrate that IS application at the design stage can shift risk profiles from HIGH to MEDIUM-LOW without reliance on Safety Critical Elements (SCEs), while brownfield IS implementation during modification can meaningfully reduce both incident frequency and consequence severity. The paper further addresses the Nigerian regulatory context, critically examining gaps in current enforcement under the Petroleum Industry Act (PIA 2021) and the NMDPRA's Midstream and Downstream Safety Regulations (2023) with respect to design-stage IS requirements. A structured implementation roadmap is presented for operators, regulators, and industry collectively. The paper argues that inherent safety is not a supplemental tool but a foundational design philosophy whose systematic adoption is essential to achieving durable, lifecycle-resilient process safety performance in Nigeria's petroleum sector.