Evaluation of the effect of corrosion defects on the structural integrity of X52 gas pipelines using the SINTAP procedure and notch theory

The notch stress intensity factor concept and the structural integrity assessment procedure for European industry (SINTAP) structural integrity procedure are used to assess gas pipeline integrity using deterministic and probabilistic methods. These pipes have external longitudinal semi-elliptical corrosion defects. Stress concentration at a defect tip is investigated via elastic–plastic finite element method analysis. The notch stress intensity concept is implemented into the SINTAP procedure and a notch-based failure assessment diagram is proposed. The safety factor and security factor are calculated through the SINTAP basic level.