In-service Corrosion Monitoring

Pulsed eddy-current measurements are generally highly repeatable. This makes it well suited for corrosion monitoring purposes. Corrosion rates can be deduced from wall thickness measurements over a time interval at fixed locations.

For example, PEC corrosion monitoring was recently installed to the test on a refinery furnace outlet operating at 420°C. The asset owner discovered that an inappropriate material had been used in the construction of the elbows of the outlet, which led to unacceptable high corrosion rates. Measurements at two-week intervals confirmed the expected corrosion rates. The high reproducibility of PEC readings at one spot allowed the asset owner to quickly and accurately monitor the degradation of the plant over time.

 

PEC monitoring probe permanent installation (left), corrosion rate presentation (right)