Pipeline failures attributed to internal corrosion in the oil and gas producing industry have not beeu decreasing despite the many corrosion mitigation, monitoring and inspection programs implemented. This Paper describes how prelimimuy investigations for evaluating the susceptibility of internal corrosion for wet sour gas pipelines have been
based on integrating the latest knowledge in fluid flow and sour gas corrosion mechanisms. It is anticipated future efforts to correlate the onset of slug flow regime with historical corrosion and inspection data may lead to development of an improved criteria for predicting the onset of corrosive water traps and for triggering appropriate
maintenance activities. This Paper provides details of two corrosion failure Case Studies where application of flow modelling has improved the understanding of the operating hazards that contributed to the formation of a corrosive environment leading to high-rate initiation and growth of localized pitting corrosion. Preliminary analysis indicates slug flow
pattern, and long water residence time of water within stagnant traps increases the likelihood of pitting corrosion. Keywords: sour gas corrosion, flow modelling, corrosion susceptibility, corrosion inhibition, slug
flow, maintenance planning