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Pipe flaw guided circumferential wave nondestructive testing method based on transverse-wave straight probes

A technology of straight shear wave probes and circumferential wave guides, which is applied in pipeline systems, mechanical equipment, gas/liquid distribution and storage, etc., can solve the problems of large attenuation, complex waveforms, and limited detection capabilities of cylindrical longitudinal wave guides, and achieve improved The effect of detection efficiency, accurate positioning, and high signal-to-noise ratio of received signals

Inactive Publication Date: 2016-06-22
BEIJING UNIV OF TECH
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Problems solved by technology

However, with the increase of the wall thickness of the transportation pipeline, the attenuation of the longitudinal guided wave on the cylindrical surface is large, the detection capability is limited, the waveform is relatively complex, the defect signal is not easy to identify, and there is a certain detection blind area
In addition, the cylindrical longitudinal guided wave is more sensitive to the circumferential defects of the pipeline, and the detection sensitivity is higher, but it is not sensitive to the axial defects on the transportation pipeline, which makes it difficult to identify the axial defects in the detection

Method used

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  • Pipe flaw guided circumferential wave nondestructive testing method based on transverse-wave straight probes
  • Pipe flaw guided circumferential wave nondestructive testing method based on transverse-wave straight probes
  • Pipe flaw guided circumferential wave nondestructive testing method based on transverse-wave straight probes

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Embodiment Construction

[0028] Combine below Figure 1 to Figure 11 The implementation process of the non-destructive testing method for circumferential wave guidance of pipeline defects based on straight shear wave probes is described in detail.

[0029] The pipe 7 to be tested selected in this experiment has an outer diameter of 104 mm, a wall thickness of 2 mm, and a length of 1000 mm. The artificial defect is 20mm long and 0.5mm wide, runs through the pipeline radially, and is arranged at a distance of 500mm from the left end of the pipeline. The long side of the artificial defect is consistent with the axial direction of the pipeline (ie, axial defect).

[0030] Step 1: Build the detection system, see figure 1 .

[0031] Step 2: Draw the dispersion curve.

[0032] The wave model of the circumferential guide wave in the pipeline structure is established with Disperse software. The pipe 7 to be tested selected in this experiment has an outer diameter of 104 mm, a wall thickness of 2 mm, a leng...

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Abstract

A pipe flaw guided circumferential wave nondestructive testing method based on transverse-wave straight probes comprises the following steps: building transverse-wave straight probes in a pipe to excite a guided circumferential wave flaw detector; apply numerical calculation software to drawing guided circumferential wave dispersion curves of the pipe; selecting an excitation frequency suitable for pipe flaw nondestructive detection; drawing wave structure charts of all guided circumferential wave modes under the frequency to determine excitation methods of the corresponding guided circumferential wave modes and the relationships between the arrangement directions of the transverse-wave straight probes and guided circumferential wave excitation typical modes; and exciting guided circumferential waves, receiving flaw echoes of the guided circumferential waves, and determining the pipe flaw positions by analyzing the time at which reflection echoes in received signals reach a receiving point.

Description

technical field [0001] The invention relates to a method for nondestructive detection of pipeline defect circumferential guided wave based on a straight shear wave probe. The method can be used for nondestructive detection of pipeline defects and belongs to the field of nondestructive detection. Background technique [0002] Pipeline transportation plays a vital role in national defense construction and economic construction in our country. Due to the use of transportation pipelines in our country for many years, the phenomenon of aging and corrosion has gradually appeared in the transportation pipelines, and even pipeline vicious accidents such as pipeline leakage, rupture and even burst have occurred, which have brought huge economic losses to the country and damaged and polluted the surrounding ecological environment. Make people's safety and property suffer loss and threat. Due to the limited inspection methods for pipeline defects in my country at this stage, it is imp...

Claims

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Application Information

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IPC IPC(8): F17D5/02
CPCF17D5/02
Inventor 何存富郭程吕炎张学聪吴斌
Owner BEIJING UNIV OF TECH
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