Corrosion mapping is a quantitative way to inspect a material where oxidation or erosion has reduced its thickness. Since an ultrasonic path is directly reduced on a corroded part, a conventional UT beam can report one specific thickness at a time while a phased array scan can produce an array of thicknesses. For the 3D scanners, since access to inner surface is generally restricted, the combination of a 3D scan (when available) with UT data creates a very powerful solution. Today instrument embedded software provides all the necessary tools to produce efficient corrosion mapping results with different level of precision (resolution) that depends on the technology used. In addition to that, PC software applications enhance that workflow by assisting the technician in planning the inspection (scan plan), analysing the data recorded and taking the right decision. Since each techniques are accurate, this paper ultimately compares these corrosion mapping solutions showing advantages, benefits and limitations along with some results.

Technology Summary

The solution presented here is to combine the technologies of the best 3D scanners and UT measurement techniques for a True Wall Thickness Assessment. By merging the high resolution wall thickness measurements obtained via Phased Array corrosion mapping technic and the accurate outer surface 3D scan, this will provide a more precise evaluation of the integrity of a pipe for mid-wall anomalies detection, corroded zone dimensioning and burst pressure calculations. With this solution, integrity engineers will benefit from the best information available to take the right decision and ensure public safety.

3DSL RHINO

Corrosion Assesment

Dent Assesment

Dent Assesment Analysis