Acoustic-magnetic combined in-pipeline detector

Abstract

The invention discloses an acoustic-magnetic combined detector in a pipeline. The detector comprises a supporting shaft, a magnetizer used for magnetizing a to-be-detected pipeline, an optical fiber acoustic wave sensor, a sealing driving assembly used for driving the supporting shaft to move in the axis direction of the pipeline, a signal collecting and processing assembly and a plurality of probes used for detecting a leakage magnetic field, wherein the optical fiber sonic sensor and the probe are in signal connection with the signal acquisition and processing assembly; the sealing driving assemblies are connected to the two ends of the supporting shaft, the optical fiber acoustic wave sensors are connected to one end of the supporting shaft through sensor supports, the multiple probes are evenly connected to the periphery of the supporting shaft through probe supporting rods, and the probes are attached to the inner wall face of a pipeline and can be distributed in the cross section of the pipeline in an array mode. Due to the combination of pipeline magnetic flux leakage detection and sound wave detection technologies, the detection precision is high, the omission ratio is low; the method is suitable for detecting complex defects of pipelines.

Description

technical field [0001] The invention relates to the technical field of pipeline defect detection, and more specifically, relates to an acousto-magnetic combined in-pipeline detector. Background technique [0002] In order to ensure the safety of pipeline transportation, oil and gas pipelines are subject to mandatory inspection, and pipeline magnetic flux leakage detection technology is the main means of pipeline defect detection and quantitative analysis. [0003] Due to the low detection accuracy of complex defects in oil and gas pipelines, pipeline girth welds, spiral welds, axial grooves, micro-leakage or seepage cannot be detected at the same time, and the missed detection rate of defects, especially micro-leakage, is high. Therefore, testing instruments with a single detection principle cannot meet the current requirements for complex defect detection in pipelines. [0004] To sum up, how to improve an in-line detector with high detection accuracy and low missed detect...

AI Technical Summary

Problems solved by technology

[0003] Due to the low detection accuracy of complex defects in oil and gas pipelines, pipeline girth welds, spiral welds, axial grooves, micro-leakage or seepage cannot be detected at the same time, and the missed detection rate of defects, especially micro-leakage is high

Therefore, detection instruments with a single detection principle cannot meet the current requirements for complex defect detection in pipelines

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