Eddy probe array for detecting pipeline deformation

Abstract

The invention discloses an eddy probe array for detecting pipeline deformation, and belongs to the technical field of pipeline non-destructive testing. An eddy distance measurement principle is applied to detection on large deformation of pipelines such as pipeline expansion and concaveness. A whole eddy distance measurement probe sensor comprises functional modules of an excitation circuit, a coil, a signal receiving and regulating module and a data acquisition and storage module. A detector with the array type eddy distance measurement probe is adopted to scan inside an oil-gas pipeline, the influence of an alternating magnetic field sensed by the probe on a pipeline wall to equivalent impedance of the excitation coil is converted into variation of voltage and current signals, by virtue of the variation of the electric signals, the variation of the vertical distance D of the eddy probe from the pipeline is measured, and thus geometrical parameters of pipeline expansion and concaves can be obtained. By adopting the eddy probe array, non-contact type continuous measurement on damage such as pipeline expansion and concaveness can be achieved, circumferential full-coverage detection of the probe can be achieved, and the eddy probe array has the characteristics that relatively large expansion can be measured, the sensitivity is high, the frequency response is wide, detection omission can be prevented to the maximum extent, and the like.

Description

technical field [0001] The invention belongs to the technical field of pipeline non-destructive testing, and relates to an eddy current ranging probe and a testing method, which are used to detect the expansion and depression of oil and gas pipelines. Background technique [0002] Pipeline non-destructive testing technology is a technology to detect whether there are potential safety hazards such as deformation, corrosion and cracks in long-distance pipelines in service. The inspection of oil and gas pipelines is a serialized process, which is carried out in multiple stages. First put in the pipeline pigging equipment, and then put in the deformation detection equipment to detect the deformation size and deformation position of the pipeline, and at the same time identify the characteristics of the pipeline, such as welds (spiral welds, girth welds, straight welds), tees, valves, elbows , direction, in order to judge the passing ability of subsequent corrosion and crack dete...

AI Technical Summary

Problems solved by technology

[0004] The invention applies the eddy current ranging method to the detection of pipeline expansion and sag, provides a pipeline defect detection method for large deformation pipelines, and solves the problem that the ordinary deformation detection contact swing arm probe has a limited detection range and cannot measure large expansion.

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