Review and Evaluation of Corrosion Management Practices in Petroleum Pipelines in Delta State

Pipeline corrosion is the leading technical cause of crude oil spill incidents in Delta State, South South Nigeria, with attendant economic losses, environmental degradation, and community conflict. This study reviews the corrosion management practices of three pipeline operating companies in Delta State across a combined network of approximately 1,200 kilometres of crude oil and product pipelines, using direct inspection data, corporate corrosion management plans, and regulatory reports. Corrosion management elements evaluated include internal and external corrosion monitoring techniques, cathodic protection system performance, inline inspection and smart pigging frequency, corrosion inhibitor injection programmes, and integrity management frameworks against API 1160 and NACE SP0169 standards. Analysis of inline inspection records from 2019 to 2024 revealed metal loss features exceeding 40% wall thickness in 8.7% of inspected pipeline segments, classifying these as requiring immediate repair under ASME B31.G assessment criteria. Cathodic protection potential measurements indicated substandard protection at 33% of measurement points, primarily at river crossing segments. Corrosion inhibitor injection compliance records showed dosing interruptions at 18% of injection stations during the monitoring period. The study concludes that a reactive rather than proactive integrity management culture persists among pipeline operators in Delta State, and recommends mandatory adoption of risk-based inspection planning and digital corrosion data management systems. Keywords: pipeline corrosion, corrosion management, cathodic protection, inline inspection, Delta State