Detection system for wall thickness and defect of oil gas pipeline

Abstract

An oil and gas pipeline wall thickness and defect detection system consists of a sensor fixing device, 32 sets of circumferential array measuring head components that can realize radial rough adjustment and spring adaptive adjustment, and realize process control, signal acquisition, data processing and environmental temperature. It is composed of a compensated electronic control system. The symmetrical sensor fixing device is evenly distributed with radial adjustment mechanisms according to two spans. The invention adopts the microcomputer control mode in which the program-controlled constant current excitation detection and the axial movement of the device are alternately performed, and the long-distance online detection of the pipe wall circumferential direction and the pipe wall axial direction is simultaneously performed in the magnetic conducting pipe. The electromagnetic force generated by the programmed constant current excitation makes the U-shaped iron core adsorb on the tube wall to form a constant closed magnetic circuit required for the detection. Compared with the permanent magnet excitation, the implementation of the detection process and the axial movement of the device alternately reduces the Resistance to axial movement of the device in the pipe and wear of the measuring head components.

Description

Technical field: [0001] The invention relates to an oil and gas pipeline wall thickness and defect detection system, which is used for detecting the wall thickness and defects of natural gas, coal gas or oil pipelines, and belongs to non-destructive detection technology, sensor technology and robot technology. Background technique: [0002] Oil and gas pipeline transportation occupies an extremely important position in the national economy. The basic requirements for oil and gas pipeline transportation are safety and efficiency. Once a pipeline accident occurs, it will not only cause huge economic losses, but also have serious consequences for society and the environment. The direct and indirect economic losses are huge, and the repair costs are also very high. It is more important to detect new and old pipelines. [0003] At present, there are mainly leakage method, ultrasonic method, eddy current method, electromagnetic ultrasonic method, etc. for the detection of pipe w...

AI Technical Summary

Problems solved by technology

The patent No. CN 1051086A is the electromagnetic ultrasonic automatic flaw detection technology, because the distance between the excitation coil of the received signal and the measured surface directly affects the measurement accuracy, so it cannot be applied to online detection; although the patent G01N28 / 82 solves the problem of CN 1051086A, it does not involving thickness measurement

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