Internal Corrosion Threat Management in Legacy Gas Storage Pools: A Risk-Based ICDA Framework (C2026-00228)

Sureshkumar Srinivasan, Patrick Teevens, Sridhar Arumugam, Vaibhav Luthra

This paper presents the successes and lessons learned from implementing an adaptive internal corrosion threat management strategy for legacy gas storage assets within Enbridge's Southern Ontario Gas Storage and Distribution System. To accomplish this, a preliminary evaluation of internal corrosion potential across multiple gas storage pool gathering systems was performed through gas phase behaviour analysis, with pools subsequently ranked according to their internal corrosion risk. A small percentage of these were designated as Priority 1, characterized by relatively high water-wetting potential and elevated CO₂ partial pressures. One such Priority 1 pool (Pool-1) was selected for further evaluation using the Wet Gas Internal Corrosion Direct Assessment (WG-ICDA) methodology. Recent and scheduled In-Line Inspection (ILI) runs in Pool-1 provided an opportunity to utilize available ILI data as a proxy for the Detailed Examination (DEx) step in the assessment process. This paper discusses the results of the WG-ICDA process which involved field sampling, laboratory testing, predictive modeling, and validation of the ICDA process. The study demonstrates the effectiveness of ICDA as an integrity validation tool, enabling identification of internal corrosion root causes and providing actionable recommendations for monitoring and mitigation strategies.