Abstract
Pipes in power plants tend to be damaged at the pipe elbows and lower reach of orifices by Flow accelerated corrosion and erosion. As one of the conventional techniques, an ultrasonic thickness meter is generally used to measure the main pipe thickness and detect the corrosion wastage in power generation plants. However, this requires plant outage time and cost to dismantle and reassemble the heat-insulating coat of the pipes. To solve these problems, we developed a new measuring technology by combining Electromagnetic Acoustic Transducer (EMAT) and Fiber-Optic sensors. Since it can be put between the pipe and the heat insulator, this sensor enables us to measure and monitor the thickness of the pipe online. This report describes how to detect scale adhesion to inner surface of pipes with EMAT and Fiber-Optic sensor.
