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2009

Risk Assessment Methodologies for Pipelines & AGIs 2026-2027

Abstract

The UK’s high pressure gas transmission and distribution networks-which comprise of buried pipelines and above ground installations (AGIs) pose potential major safety hazards in the rare event of gas release. Effectively managing these risks is challenging due to several interrelated issues such as outdated or fragmented risk assessment methodologies, where existing tools and methodologies need to be continuously updated to reflect regulatory and standards change. Individual gas network operators do not experience enough major incidents to statistically derive meaningful failure frequencies. This limits their confidence in risk estimates unless data is pooled and collectively analysed across the industry. Risks vary significantly between diverse asset types, and a consistent integrated methodology is hence needed to address this complexity.

National Gas Transmission and Cadent Gas must demonstrate through credible, up-to-date safety cases, that risks are understood, quantified realistically and managed to as low as reasonably possible (ALARP). The continued enhancement of these methodologies will further strengthen assurance in risk management.

Collaborative projects provide great potential for new learning, by tapping into the knowledge and experience of other operators with the same problems. This project supports National Gas and Cadent Gas in optimizing the safety of new facilities through appropriate layout and design, and in achieving ongoing improvements in the efficiency and effectiveness of the management of risk associated with AGIs on the high-pressure gas transmission pipeline network. This project also supports the project partners in achieving ongoing improvements in the efficiency and effectiveness of the management of risk associated with high-pressure gas pipelines. Typically on each JIP the Final Report or a Public Domain Document is made available for distribution to interested parties without restriction. This arrangement depends on the specific project and confidentiality arrangements for that project. The participation agreements for JIPs also make provision for publication of new developments made as part of the collaboration as agreed by participating companies, e.g. presentation of papers at appropriate conferences. Learning gained from each project influences the standards for gas transmission pipeline risk assessments published by the Institution of Gas Engineers and Managers which are written around the JIP methodologies, with input from National Gas Transmission, Cadent Gas, and DNV.

file format pdf download NIA_NGT0294_Risk_Assessment_Methodologies_for_Pipelines_AGIs_2026-2027.pdf
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2026-07-01
2026-11-11
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