CircumferentialAn event that occurs or is measured along the circumference of a pipeline. It implies the direction or orientation that is perpendicular to the longitudinal axi… cracks can be addressed with inline inspection (ILI)A method used to assess the the integrity and condition of pipelines. It involves the use of specialized tools that are inserted into the pipeline and propelled… tools utilizing ultrasonic shear wave technology. To accurately detectTo sense or obtain a measurable indication from a feature. circumferential cracking, a shear wave pulse travels trough the pipe wall at an angle of 45° and is reflected either by an external or internal flawAn imperfection smaller than the maximum allowable size..