In the present study, the SINTAP procedure has been proposed as a general structural
integrity tool for semi-spherical, semi-elliptical and long blunt notch defects. The notch stress
intensity factor concept and SINTAP structural integrity procedure are employed to assess
gas pipelines integrity. The external longitudinal defects have been investigated via elastic–
plastic finite element method results. The notch stress intensity concept is implemented into
SINTAP procedure. The safety factor is calculated via SINTAP procedure levels 0B and 1B …