Abstract
This paper describes a novel method of inspecting the wall-thinning by means of the strain measurement on the outer surface of pipes. The strain on this surface increases under the same pressure when the wall thickness gets thinned due to the erosion or corrosion of the inner surface of pipes. This relationship between the strain and thinning is expressed in some simple equations in the case where the thinning occurs equally on the whole inner surface of pipes. From these equations, it is found that strain measurements on the outer surface enable the wall-thinning to be detected and quantified, and through FEM analyses, it is clarified that these simple equations can also be used in tapered pipes. In addition, through the experiment using the optical fiber strain sensor, it is confirmed that this sensor can be applied to the strain measurement at an elevated temperature.
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