Automatic identification and intelligent evaluation method for oil and gas pipeline outer surface corrosion and pit defects based on three-dimensional laser scanning

Abstract

The invention relates to an automatic identification and intelligent evaluation method for oil and gas pipeline outer surface corrosion and pit defects based on three-dimensional laser scanning. The method comprises the steps of: 1, scanning a part, with a defect, of the outer surface of a pipeline, and collecting three-dimensional point cloud data of the pipeline defect, transmitting the three-dimensional point cloud data of the defect of the pipeline to a computer to display a three-dimensional model of the pipeline defect; and 2, performing axial section or circumferential section on the three-dimensional model of the pipeline defect. The method has the beneficial effects that: the traditional evaluation method needs to consume 1-2 working days, and the pipeline defect can be quickly evaluated. Directed at a measurement error existing in a traditional manual grid drawing self-defining measurement mode, the method can automatically identify the defect, improve the measurement precision and ensure the evaluation accuracy. And an appropriate defect evaluation standard can be quickly matched. The method can also be applied to the field of rapid and accurate measurement and evaluation of defects of outer surface corrosion or recession of power plant pipelines, special pressure equipment and fan blades.

Description

technical field [0001] The invention belongs to the technical field of identifying defects on the outer surface of oil and gas pipelines, in particular to an automatic identification and intelligent evaluation method for corrosion and pit defects on the outer surface of oil and gas pipelines based on three-dimensional laser scanning. Background technique [0002] With the increase of the service time of oil and gas pipelines, the defects caused by corrosion and mechanical damage will continue to increase, and in severe cases, it will cause failure problems such as perforation and leakage, which may lead to vicious accidents such as fire and explosion, casualties, etc., and the safe operation of pipelines is facing severe challenges. . [0003] It is an important content of oil and gas pipeline safety management to take protective measures in time for pipeline defects. In practical application, the traditional pipeline surface defect evaluation method first excavates the bur...

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Problems solved by technology

[0004] However, traditional defect detection methods cannot accurately measure the geometric dimensions of pipeline surface defects, which affects the accuracy of pipeline safety level assessment and remaining life estimation; in addition, due to the manual measurement of defects, the time for on-site data collection is long and the timeliness is poor. After the excavation, it is necessary to cover the soil in time, otherwise the pipeline will be exposed for a long time, which will bring certain safety hazards

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