Method for detecting thickness of non-metallic coating on inner wall of small-aperture long-distance pipeline

Abstract

The invention discloses a method for detecting the thickness of a non-metallic coating on the inner wall of a small-aperture long-distance pipeline. The method includes the following steps that 1, system installation is carried out; 2, a vehicle body is started with a high-pressure air source; 3, data of non-metallic coating on the inner wall of the small-aperture pipeline is collected; 4, the position of the vehicle body is tracked; 5, the thickness of the non-metallic coating of each cross section position of the inner wall of the small-aperture pipeline is obtained; 6, the vehicle body is removed to examine obstacles. A signal processing vehicle is placed among three measuring vehicles to reduce the signal transmission length and the signal interference, a mileage measuring mechanism isused for recording the travel mileage of the vehicle body, an electromagnetic positioning vehicle is arranged at the tail end to avoid normal driving of the vehicle body and interference to vehicle body sampling signal measuring at the time of measuring, the external high-pressure air source is used for pushing the straight-line-shaped vehicle body, the electromagnetic positioning vehicle check the stuck position of the vehicle body, digging, taking-out and inspection with equipment are performed in order, the thickness of the non-metallic coating of the cross section is determined by using the thickness of the non-metallic coatings at three positions of the cross section of the pipeline, and the measurement is reliable and effective.

Description

technical field [0001] The invention belongs to the technical field of coating thickness measurement on the inner wall of a small-diameter pipeline, and in particular relates to a method for detecting the thickness of a non-metallic coating on the inner wall of a small-diameter long-distance pipeline. Background technique [0002] Pipeline anticorrosion technology is a protection technology to prevent pipelines from being corroded by transport media (oil, natural gas, etc.). Most of the oil and gas being transported are corrosive, and the inner wall of the pipeline will be corroded if exposed to these corrosive media for a long time. Once the pipe wall is corroded too thin, it will not be able to withstand pressure, or even be corroded and perforated, resulting in oil and gas leakage, not only interrupting transportation, but also polluting the environment, even causing fire, and causing damage to people and property. Because most of the current transmission pipelines are m...

AI Technical Summary

Problems solved by technology

Most of the existing detection technologies are suitable for the detection of coatings on the inner wall of large pipes, and there are very few detections of coatings on small pipes. Moreover, the small diameter detection robot is limited by the battery energy, and the stroke is less than 800m. detection

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