Metal pipeline detection device and method

Abstract

The invention relates to a metal pipeline detection device and method. The device comprises a position judgment unit, a central control unit, a sensor control unit and a sensor group, wherein the position judgment unit is used for obtaining the position information of the metal pipeline detection device, and the central control unit is used for ordering the sensor control unit to start to detect according to the position information, and the central control unit judges the pipe wall defect according to reflection echo; the sensor control unit is used for blazing ultrasound guided wave through the control sensor group, and the received reflection echo is sent to the central control unit; and the sensor group is uniformly distributed on the same periphery direction of the detection device and is used for generating ultrasound guided wave and receiving the reflection echo. The metal pipeline detection device and method provided by the embodiment of the invention have the advantages that the propagative ultrasound guided wave frequency along a pipe wall is lower, and the detection device and the detection method suffers small restriction between a coil and the pipe wall interval, so that the detection device and the detection method can be subjected to project application more easily; and the metal pipeline detection device and method are applicable to detecting the axial narrow and small slightness defect and cracks along the pipe wall, and can be used for detecting the metal loss defect on the pipe wall.

Description

technical field [0001] The invention relates to the technical field of long-distance natural gas pipelines, in particular to detection technology for local metal loss defects and axial crack defects on pipe walls, and in particular to a detection device and method for metal pipelines. Background technique [0002] Long-distance natural gas pipelines are currently the main means of transportation of natural gas. With the rapid development of my country's long-distance pipeline transportation industry, the high-pressure and large-displacement natural gas pipeline transportation system has become increasingly large. High-grade steel pipe materials are gradually promoted and the steel grade is continuously enhanced. With the continuous increase of the pipeline operation time, the local defects on the pipeline gradually deteriorate, often causing huge disasters, causing huge economic losses and environmental pollution. Therefore, regular inspection of the defects on the gas pipel...

AI Technical Summary

Problems solved by technology

[0004] Magnetic flux leakage detection technology is not sensitive to cracks in pipelines and narrow and slender defects along the axial direction; while ultrasonic technology has sufficient sensitivity to small cracks on the pipe wall, but the sensor requires couplant, so it is difficult to apply to gas transmission Detection of pipelines; electromagnetic ultrasonic technology can overcome the technical defect that ultrasonic technology must use couplant, and can be applied to the detection of gas pipelines

However, due to the low energy conversion efficiency of the sensor of electromagnetic ultrasonic technology, its application has great limitations.

In addition, the energy conversion efficiency of the sensor decays exponentially with the distance between the sensor and the pipe wall, and the higher the frequency of the excited ultrasonic wave, the smaller the distance between the sensor and the pipe wall, so there are great challenges for engineering applications

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