A Novel Pulsed Eddy Current Technology for the Inline Inspection of Internally Lined Piping

摘要

This work discusses the development of a novel dynamic pulsed eddy current system that provides the ability to measure the remaining wall thickness of carbon steel and cast iron pipe through liners. The differential pulsed eddy current peak amplitude and the decay rate of the pulsed eddy current response have been correlated to pipe remaining wall thickness. The system can be equipped to be mounted on a robotic inline inspection crawler and acquire data dynamically while the sensor is in motion. Initial applications have revealed results from robotic scanning at sensor lift-off distances of up to 15.9 mm (0.625 in) of carbon steel pipe are promising. This new technology will provide the nuclear industry with an inline inspection (ILI) solution for the assessment of cement-lined and other lined piping systems.