A sampling verification method for pipe spiral weld defect opening

Abstract

The invention relates to a hole opening sampling verification method for pipeline spiral weld defects. The method comprises: choosing several appropriate spiral weld defects for excavating verification; making use of internal detection results, and combining ground reference point information to conduct positioned excavation on the chosen defects, and carrying out preliminary verification by a an ultrasonic detection means; marking the sampling positions, and welding a short joint flange as the pedestal of hole opening and blocking operations; installing a hole blocking machine, cutting a disc-shaped sample containing spiral weld defects and taking it out of the pipeline through hole opening operation under pressure; then mounting a flange plug; splitting the removed sample along a spiral weld cross section, and analyzing and measuring the internal defects; and performing microscope observation to obtain the accurate positions and dimensions of the defects, reconstructing the appearances of the defects, carrying out contrast with signals given by the internal detection, and revising a defect identification method and a dimension quantification model. With the method provided in the invention, accurate verification results can be obtained to verify internal detection performance indexes and revise the defect dimension quantification model.

Description

technical field [0001] The invention relates to a hole sampling verification method for spiral weld seam defects of pipelines. It relates to the technical field of piping systems. Background technique [0002] In-pipeline inspection can detect possible defects in the pipeline without affecting the normal operation of the pipeline, providing scientific basis for the prevention of pipeline accidents and maintenance of pipelines, and plays an important role in ensuring the safe operation of pipelines. Excavation verification of pipeline defects is the basic means to verify the performance indicators of internal detectors and correct the quantitative model of defect size, and it is also an important basis for the acceptance of internal inspection items. [0003] The detection technology and detection method used in excavation verification determine the accuracy of excavation verification results. At present, the detection technologies and methods used in excavation verificatio...

AI Technical Summary

Problems solved by technology

For defects such as pipeline geometric deformation, external corrosion, and surface cracks, existing detection methods can basically meet the requirements of on-site measurement for excavation verification

However, for internal openings and buried spiral weld defects including incomplete fusion and incomplete penetration, it is difficult to accurately measure detailed parameters such as the position, length, depth, and width of the defect in the weld with existing ultrasonic and ray detection technologies. , it is impossible to accurately return the defect morphology and its position in the weld cross section, and it is difficult to effectively correct the pipe spiral weld defect identification method and size quantification model

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