This PhD aims at developing an approach to detect and evaluate corrosion occurring in pipelines. The multi-layered structure of most pipes in process plant applications complicates the deployment of conventional non-destructive testing techniques. For this reason, the project employs pulsed eddy current (PEC) as an alternative for a non-contact approach.
However, the use of PEC poses various challenges; in addition to the variation in the value of lift-off/insulation thickness, the presence of weather protection provides shielding effects to the penetration capability of a PEC system. The performance of a PEC system is also largely dependent on the electrical and magnetic properties of pipe material, which are generally unknown.
In order for a PEC technique to be employed effectively, these issues need to be addressed. Tools such as analytical modelling, signal processing, and statistical-based algorithms are employed to compensate the adverse effects.