Large-diameter high-steel-grade mountain pipeline stress detection method
A stress detection, high-grade steel technology, applied in force/torque/work measuring instrument, force measurement by measuring the change of magnetic properties of materials caused by applied stress, measuring force, etc., can solve the problem of pipeline stress that cannot detect the stress value. Status and other problems, to achieve the effect of protecting the structural integrity and improving the detection efficiency
Active Publication Date: 2021-08-06
SOUTHWEST PETROLEUM UNIV
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Among them, when the ultrasonic method is applied, the probe must be in contact with the surface of the pipeline, while the non-contact magnetic measurement method can only detect the stress concentration location, but cannot detect the specific stress value and evaluate the stress state of the pipeline
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[0054]The present invention will be further described below in conjunction with the accompanying drawings and embodiments. It should be noted that, in the case of no conflict, the embodiments in the present application and the technical features in the embodiments can be combined with each other. It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by those of ordinary skill in the art to which this application belongs. The disclosure of the present invention uses "comprises" or "comprises" and other similar words to mean that the elements or objects appearing before the words include the elements or objects listed after the words and their equivalents, without excluding other elements or objects.
[0055] The physical basis of magnetic detection and magnetic memory detection is the magnetomechanical effect of ferromagnetic pipes. The ferromagnetic pipeline is magnetized u...
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The invention discloses a large-diameter high-steel-grade mountain pipeline stress detection method. The method comprises the following steps of carrying out magnetic force detection on a target mountain pipeline to obtain a magnetic field gradient of the target mountain pipeline; calculating a magnetic field gradient modulus according to the magnetic field gradient; calculating a magnetic anomaly grade index F value according to the magnetic field gradient modulus; and calculating the overall stress value of the target mountain pipeline according to the magnetic anomaly grade index F value. According to the method, the specific mountain pipeline stress value can be obtained, stress detection of the mountain pipeline is carried out through the magnetic detection technology, an anti-corrosion layer of the mountain pipeline does not need to be stripped, and structural integrity of the mountain pipeline can be protected.
Description
technical field [0001] The invention relates to the technical field of non-destructive testing of pipelines, in particular to a stress testing method for large-caliber high-grade steel-grade mountainous pipelines. Background technique [0002] Under geological disasters such as landslides, collapses, unstable slopes, debris flows, and karsts, mountain pipelines will form local stress concentrations under the action of internal and external complex loads, leading to risk accidents such as deformation and fracture of pipelines. Therefore, the main strategy to ensure the structural integrity and safety of mountainous pipelines is to prevent the stress value from exceeding the bearing limit of pipeline materials. There is an urgent need for scientific and effective stress detection methods to measure the stress level of dangerous pipeline sections in service. [0003] At present, the pipeline surface stress detection technologies with engineering application value include: X-ray...
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IPC IPC(8): G01L1/12G01N27/85G01L5/169
CPCG01L1/127G01N27/85G01L5/169
Inventor 杨舒婷
Owner SOUTHWEST PETROLEUM UNIV