There is concern about the degradation of aged power transmission systems, many of which are 30−50 years old. Steel pipe towers consisting of tubular steel pipes are one type of transmission tower. The internal corrosion of such steel pipes is particular concern because its appearance cannot be assessed from the external observation. Therefore, knowledge on the corrosion rate and its distribution inside steel pipes can contribute to the maintenance of steel pipe towers. In this study, the distribution of the corrosion rate inside steel pipes in the longitudinal direction was evaluated using atmospheric corrosion monitoring (ACM) sensors, which were installed inside the steel pipes. The amount of salt deposited inside the steel pipes had a similar distribution to that of corrosion rate obtained in the experiment using ACM sensors. This study revealed that the method of installing several ACM sensors inside a pipe is effective for estimating the distribution of the corrosion rate inside the pipe.

Subject
Atmospheric corrosion, Test methods, Sensors, Piping, Corrosion rate, Atmosphere, Walls, Sea salt, Steel pipes, Transmission towers, Towers, Wind, Conductivity
Keywords:
Atmospheric Corrosion, Transmission Tower, Steel Pipe, ACM sensor, Deposited salt amount
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2016
Association for Materials Protection and Performance (AMPP)
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