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Mountain pipeline ring welding seam non-contact recognizing and positioning method

A non-contact identification and positioning method technology, applied in the direction of material magnetic variables, etc., can solve the problem of large deviation of positioning welds, achieve the effect of simple and fast detection operation, and realize large-scale detection

Active Publication Date: 2019-04-16
SOUTHWEST PETROLEUM UNIV
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Problems solved by technology

[0005] The purpose of the present invention is to provide a non-contact identification and positioning method for the girth weld of mountainous pipelines in view of the technical problem that the existing internal detection method has a large deviation in positioning welds and is not suitable for detection of curved and complex pipelines in mountainous areas

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  • Mountain pipeline ring welding seam non-contact recognizing and positioning method
  • Mountain pipeline ring welding seam non-contact recognizing and positioning method
  • Mountain pipeline ring welding seam non-contact recognizing and positioning method

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Embodiment Construction

[0037] The present invention will be further described in detail below in conjunction with the accompanying drawings, so that those skilled in the art can implement it with reference to the description.

[0038] The present invention selects a test pipeline with a length of 1 km to carry out on-the-spot pipeline detection. The specific operation steps are as follows:

[0039] Step 1. First, analyze the design and operation documents of the section of the pipeline to be tested. The total length of this section of pipeline is 1km, the diameter of which is 508mm, the wall thickness of the pipeline is 9mm or 11mm, the design pressure of the pipeline is 6.3MPa, the actual operating pressure is 4.87-4.92MPa, and the type of weld is girth weld. The period is one week.

[0040] Step 2. On the 1st to 2nd day, use the RD8000 routing detector to detect the route of the test pipeline, record the terrain and markers around the pipeline, and mark the axis of the pipeline on the ground. U...

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Abstract

The invention discloses a mountain pipeline ring welding seam non-contact recognizing and positioning method. The method comprises the following steps of firstly, labeling a pipeline axis on the ground; secondly, adopting the non-contact type scanning magnetometer to move along the axis of the pipeline on the ground, wherein two magnetic sensors of the magnetometer are used for measuring three components Bx1, By 1, Bz1 and Bx2, By 2, Bz2 of the magnetic field; and calculating a gradient component and a gradient modulus dQ through data acquisition software; and arranging a DGPS positioning device in the magnetometer, synchronizing the mileage of the detecting points and the detecting data of the magnetometer; and dividing the axes of the pipelines into a plurality of detection intervals atequal interval, wherein each interval is numbered C1, C2 ,......Cn in sequence; collecting and storing the gradient component and the gradient modulus data which are detected after each interval is detected and labeling the numbers C1, C2,......Cn in sequence; carrying out ring welding seam identification through collected data. The method is not limited by the structure and the size of the pipeline, can be applied to complex and diverse terrain environments and is suitable for detecting mountain pipelines.

Description

technical field [0001] The invention belongs to the technical field of non-destructive testing of pipelines, and in particular relates to a method for locating girth welds of mountainous pipelines through non-contact magnetic stress detection. Background technique [0002] In-pipeline inspection is a non-destructive inspection method developed earlier and more mature in pipeline inspection at present. During internal inspection, a weld sensor is generally installed on the detector. From the data collected by the weld sensor, according to the weld seam Point recognition and matching method for girth weld recognition. The identification of the girth weld in the pipeline detection is to identify the girth weld from the signal collected by the weld sensor. Move the probe of the girth weld detector close to the inner wall of the pipeline to simulate the detector, collect the weld signal, and the odometer moves synchronously. [0003] When the detector advances in the pipeline, ...

Claims

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Application Information

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IPC IPC(8): G01N27/82
CPCG01N27/82
Inventor 廖柯熹何腾蛟何国玺彭善碧
Owner SOUTHWEST PETROLEUM UNIV
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