Measurement Of Roof Topping Effects As An Integral Part Of Routine In-Line Inspection

Caused by improper crimping of the steel sheet in the production process, roof topping is a geometric anomaly that occurs along the longitudinal seam weld of the pipe. These incorrectly crimped sheets then result in a deviation from the perfectly circular geometry of the pipeline. The implications of roof topping for pipeline integrity are severe. They include risk of failure during hydro-testing or fatigue failure during pipeline operation.