Pipeline inner wall wear corrosion monitoring device and monitoring method thereof

Abstract

The invention discloses a pipeline inner wall wear corrosion monitoring device and a monitoring method thereof. The pipeline inner wall wear corrosion monitoring device includes an annular wear corrosion sensor, an external pressure chamber and an electronic chamber, the annular wear corrosion sensor is placed in the external pressure chamber, and a potentiostat, a zero-resistance galvanometer, ahigh-precision digital voltmeter, a relay switch, a micro-resistance meter and a signal acquisition controller are placed in the electronic chamber; the sensor is connected to a pipeline through an end flange, an corrosion element and a temperature reference element are both connected to the micro-resistance meter, and the micro-resistance meter measures resistance of each partition, and the resistance is used for calculating the total metal loss rate of the inner wall of the pipeline; an electrode element, a potential reference element and the corrosion element form a three-electrode system,and the corrosion rate is obtained by measuring linear polarization of the corrosion element through the potentiometer and the zero-resistance galvanometer; and a difference between the total loss rate and the corrosion rate is the wear rate. The annular wear corrosion sensor can predict occurrence of wear corrosion in the pipeline, and evaluate the wear rate and corrosion rate of the pipeline inreal time.

Description

technical field [0001] The invention relates to the technical field of automatic monitoring, in particular to a pipeline inner wall wear and corrosion monitoring device and a monitoring method thereof. Background technique [0002] As the main carrier of oil and gas transportation, oil and gas pipelines often face a highly corrosive medium environment containing solid particles, so wear and corrosion damage is one of the main forms of pipeline failure. In the process of wear and corrosion, the metal surface is damaged in two forms, one is the damage caused by the direct oxidation of iron atoms on the metal surface, which is an electrochemical corrosion process; the other is the damage caused by the impact of solid particles The process of peeling off from the substrate. According to the different damage forms of metals in the process of wear and corrosion, as shown in formula (1), the total loss rate of metals is the corrosion rate and wear rate Sum. Due to the syner...

AI Technical Summary

Problems solved by technology

However, in a wear-and-corrosion environment, the ring resistance probe can only monitor the total metal loss rate of the entire pipeline section, and cannot distinguish the corrosion rate from the wear rate, nor can it predict the occurrence of wear and corrosion.

Therefore, it is also difficult for the ring resistance probe technology to provide operators with accurate wear and corrosion information in the wear and corrosion environment.

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