Risk-based integrity management (RBIM) of oil & gas offshore fixed steel structure platform

Elmasry, Ahmed (2020) Risk-based integrity management (RBIM) of oil & gas offshore fixed steel structure platform. Masters thesis, Memorial University of Newfoundland.

[English] PDF - Accepted Version Available under License - The author retains copyright ownership and moral rights in this thesis. Neither the thesis nor substantial extracts from it may be printed or otherwise reproduced without the author's permission. Download (1MB)

Abstract

Oil and gas offshore facilities structures operating in harsh environments are associated with high risk and the likelihood of failures. Hence, frequent inspections are needed to enhance the integrity and reliability of these 'platforms' structures using a rigorous strategy. The purpose of this research is to develop an integrity management strategy for an above and underwater offshore platform steel structure using risk-based integrity management assessment. This strategy is developed in four steps: step one identifies the elements of the platform structures suitable for risk-based integrity management; in step two, identifies anomalies and degradation mechanisms. The third step is hazard identification using qualitative risk analysis, by hazard and operability model, and quantitative risk analysis, by the fault tree model, to calculate the probability of failure then qualitative assessment assigns the consequences. Step four ranks the risk to prioritize inspection and maintenance schedule and build an integrity management strategy. As an outcome of this thesis, we are able to identify and categorize the degradation and deterioration mechanisms for the fixed steel structure platforms and gain an understanding of platform structural risks and rank these according to severity. Consequently, increase and enhance the reliability and integrity of the platform using an appropriate integrity management strategy. The proposed risk-based integrity management analysis proved that the risk-based inspection and risk-based maintenance methods used in this work are effective in terms of time, efficiency and cost, through reducing the frequency of inspection from 12 months to 24 or 36 months in some cases.

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