Long conveyance pipe defect positioning method and positioning system

Abstract

The invention relates to a location method for deficiency of long conveying pipe and the location system. In the location method for errors of long-range conveying pipe, a series of abut ring welding line are formed in the installation process of the long conveying pipe which adopts wheel type milemeter to measure the mileage and position. When the wheel type milemeter advances in the long conveying pipe and measures the mileage, a whirlpool detecting device detects out the information about the actual time of passing certain abut ring welding line. The information and the data of the wheel type milemeter are analyzed at the same time, so as to accurately ascertain the position of the error in the pipe. The positing method for errors of long conveying pipe includes a wheel type milemeter and a whirlpool detecting device, wherein, the whirlpool detecting device includes a whirlpool winding and a whirlpool detecting processing module which is connected with the whirlpool winding. The location method and the location system disclosed in the invention can prevent the accumulative measure error of the wheel type milemeter from increasing, improve the positioning accuracy and completelysatisfy the requirements in the process of positioning.

Description

technical field [0001] The invention relates to a pipeline internal detection method and device, in particular to a long-distance pipeline defect positioning method and positioning system. Background technique [0002] Long-distance oil and gas pipelines have been corroded after years of operation, affecting operation and even endangering the environment. Therefore, it is necessary to regularly detect the corrosion and deformation of the pipeline from the inside of the pipeline, and record the location, depth, area and other information of the corrosion. The technicians will evaluate the integrity based on the test results and determine whether it needs to be repaired or replaced. [0003] At present, the following methods are usually used at home and abroad to determine the corrosion location in long-distance pipelines: [0004] (1) Use the position information provided by the wheel odometer to determine the position of the corrosion in the direction of the pipeline axis. ...

AI Technical Summary

Problems solved by technology

[0008] The purpose of this method is to solve the problem that only using the wheel-type odometer has a large error and the cost of using the combination of the magnetic device and the wheel-type odometer is expensive, and it is difficult to significantly improve the positioning accuracy. The positioning method and positioning system of long-distance pipeline defects with the precision and accuracy of defect positioning

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