This paper presents a baseline integrity assessment of the Trans Adriatic Pipeline (TAP) which was conducted with state-of-the-art Acoustic Resonance Technology. The assessment involved a comprehensive evaluation of ILI data, cathodic protection (CP) surveys, bending strain reports, and associated construction and integrity records. The principal aim was to ascertain the presence of conditions within the system that could potentially pose integrity threats, and to reevaluate the proposed reassessment interval in light of these identified risks.

The Trans Adriatic Pipeline spans a distance of 877 kilometers and plays a pivotal role in the Southern Gas Corridor, facilitating the conveyance of gas from the Caspian region to Western and South-Eastern Europe. The pipeline comprises 48-inch Helical Submerged Arc Welded (HSAW) and Longitudinally Submerged Arc Welded (SAW) Grade L485ME (X-70) segments, alongside a 36-inch longitudinally welded Grade L450 ME (X-65) section. ILI baseline surveys were conducted in June 2021, October 2021, and June 2022.

The baseline integrity assessment meticulously examined six widely recognized industry threats: External Corrosion, Internal Corrosion, Mechanical Damage, Manufacturing, Construction and Fabrication Defects, Weather-related and Outside Forces (Geohazards and Bending Strain), and Pressure Cycling (fatigue). This analysis formed the basis for devising inspection strategies, identifying immediate investigative requirements, and providing recommendations to mitigate the potential for pipeline leaks or ruptures in accordance with a suitable reassessment plan.

This paper will elaborate on the advantages of pivotal assessment and monitoring technologies. These included the deployment of Deformation ILI tools with Inertial Monitoring Units (IMU) and ROV surveys for geotechnical events. Additionally, the collection of inclinometer data for geohazard management was advised. A revised global buckling analysis was also suggested, aligning with updated industry standards. Continuous evaluation of AC potential locations and cathodic protection levels were further recommended to ensure sustained pipeline integrity.