Numerical Modeling and Comparison of Defects Present in a Metal Pipe Under Internal Pressure


  • Laidi Zahiri, Mly El houssine Ech-chhibat, Mustapha Jammoukh, Zakaria Mighouar, Khalifa Mansouri


Pipelines used for the transport of pressure fluids may have defects due to design error, external impact, or corrosion. These failures take the form of cracks that propagate until the mechanical structure is broken. A comparative study of three main causes of pipe failures (Dent defect, crack welding defect and corrosion defect) was presented and studied in this research paper. This allows these defects to be classified according to their degree of severity. First, the different results obtained in the previous works have been reviewed, and then a synthesis and comparison of the damage caused by the different defects has been carried out on the basis of a new common comparison parameter (named CCP). In addition, this comparison study was carried out on pipes with identical geometries, the same base material API X52, and is subject to the same internal loading pressure of 80 per cent of MOP (Maximum Operating Pressure). The results of this study show that the configuration with corrosion defect and internal longitudinal surface crack is the most harmful.

Keywords- Semi-elliptic crack; Dent; Fatigue; Welded pipe; Corrosion; Numerical model; Harmfulness