Abstract
A monitoring solution was developed for detection of material loss in metals such as carbon steel using the force generated by permanent magnets in addition to the optical strain sensing technology. The working principle of the sensing system is related to the change in thickness of a steel plate, which typically occurs due to corrosion. As thickness decreases, the magnetostatic force between the magnet and the steel structure also decreases. This, in turn, affects the strain measured using the optical fiber. The sensor prototype was designed and built after verifying its sensitivity using a numerical model. The prototype was tested on steel plates of different thicknesses to establish the relationship between the metal thickness and measured strain. The results of experiments and numerical models demonstrate a strong relationship between the metal thickness and the measured strain values.
Highlights
Corrosion is one of the most widespread and costly phenomena that affects various sectors of the global economy
A large portion of overall corrosion costs is attributed to the energy sector, the oil and gas industry, which operates an extensive network of pipelines and associated facilities such as storage tanks and processing plants
External corrosion refers to deterioration processes that occur on metal surfaces that are exposed to outdoor environments and are largely driven by atmospheric and climatic conditions
Summary
Corrosion is one of the most widespread and costly phenomena that affects various sectors of the global economy. Corrosion probes based on galvanic sensing require power supply, so they are considered as a source of risk for oil and gas pipes Installation of these probes implies performing major modification to the pipeline system and they can provide local measurements only. This research aims to develop a monitoring solution for detection of metal loss for pipelines or storage facilities that are difficult to inspect internally with conventional tools. Jiang et al [16,17] developed a real-time internal corrosion monitoring technique based on the optical frequency domain reflectometry (OFDR) technology They used this technology along with signal processors to provide high-resolution measurements of hoop strain in pipes using fiber optics. We envision that the sensor proposed in this work will be a first step toward the solution that is able to provide on-demand measurements for monitoring of internal corrosion rates in structures such as unpiggable pipelines
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