Technical Paper: Brownfield HAZOP/PHA Application for Residual Risk Removal Creating a Safer Future from Current Studies

Society: Other
Paper Number: 13-576
Presentation Date: 2013


The development and use of the fundamental risk assessment process, the HAZOP (Hazards and Operability Study), was originated in the 1960s by Trevor Kletz at ICI Industries in Great Britain, and has been a developing process—both in its content and the extensiveness of its application—during the last 50 years. In particular, the HAZOP process has evolved to be applied at different stages of design and execution, such that industry would specifically apply the process to its older (brownfield terminology) facilities where they can show significant reduction in chemical related incidents with use of the HAZOP process in their mature plants. This demonstrates the existence of a latent risk in these facilities, which can occur for several reasons but which is reduced by a HAZOP process. The authors use career experiences and recommended practices to advocate the HAZOP in the operations phase—also known as the the Operational, Environmental, and Safety Review (OESR)—while illustrating through case histories the use of this tool. Conclusions and recommendations are offered for further application and risk reduction in operational facilities. 

Knowledge management includes a library of understanding of the modes of failure—such as corrosion, erosion, loss of material properties, cracking, fatigue, and other failure modes—and related aspects that are critical in deepwater projects. This is due to repair, retrofit, or rehabilitation being costly or impossible. The application of early detection of and an inspection program for potential issues and identification of areas of further study is critical.

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