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Loading method for pipeline containing through cracks

A technology that penetrates through cracks and pipelines. It is applied in the field of high-temperature and high-pressure pipelines and high-temperature and high-pressure pipelines. It can solve the problems of static pressure experiment errors, impossibility, and difficult high-temperature and high-pressure experiments. It achieves uniform expansion force, simple equipment, and avoids pollution. Effect

Active Publication Date: 2015-07-08
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the pressurized medium used in the pressurization process is high-temperature and high-pressure steam, the leakage of steam will make the measurement impossible
Therefore, it is difficult to conduct high-temperature and high-pressure experiments in consideration of factors such as materials, sealing, and safety;
[0005] (2) The flow of fluid caused by leakage during the experiment will produce pressure fluctuations, which will bring certain errors to the static pressure experiment;
[0006] (3) In the process of fluid flow, the fluid source needs to be continuously replenished with new fluid to maintain a fixed pressure, which greatly increases the complexity of the device
This increases the cost of pipe fracture parameter measurement

Method used

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  • Loading method for pipeline containing through cracks
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] When the pressure medium is at normal temperature, the invention is used to load the sample of the heat transfer tube of the steam generator containing through cracks.

[0033] (1) First, process a pipe sample of appropriate size. In order to eliminate the end effect, the length of the sample pipeline 1 should be greater than twice the effective pressurized length of the expansion rod 3 during the sample preparation process. And prepare an axial crack on the pipeline 1;

[0034] (2) Use a flexible container 2 whose size matches the internal size of the pipe 1, and install an expansion rod 3 in the direction of the inner axis of the flexible container 2 to control the deformation of the flexible container in the direction of the pipe axis, wherein the flexible container 2 is a fiber fabric The liquid bag made; the expansion rod 3 is provided with a pressure transmission medium channel 5; the flexible container 2 equipped with the expansion rod 3 is sent into the pipelin...

Embodiment 2

[0038] When the pressure medium is high temperature, the present invention is used to load the steam generator containing the through-crack heat transfer tube.

[0039] (1) First, process a pipe sample of appropriate size. In order to eliminate the end effect, the length of the sample pipeline 1 should be greater than twice the effective pressurized length of the expansion rod 3 during the sample preparation process. And prepare an axial crack on the pipeline 1;

[0040] (2) Use a flexible container 2 whose size matches the internal size of the pipeline 1, and install an expansion rod 3 in the direction of the internal axis of the flexible container 2 to control the deformation of the flexible container in the direction of the pipeline axis, wherein the flexible container 2 is formed by a deformable Made of metal; the expansion rod 3 is provided with a pressure transmission medium channel 5; the flexible container 2 equipped with the expansion rod 3 is sent into the pipeline ...

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Abstract

The invention belongs to the technical field of industrial pressure pipeline detecting and particularly relates to a loading method for a pipeline containing through cracks. A flexible container matched with the inner diameter size of the pipeline is selected for loading, an expansion rod is arranged in the flexible container, and a transmission medium channel is arranged on the expansion rod. The flexible channel is communicated with a loading system through the transmission medium channel on the inside expansion rod. During loading, the transmission medium enters the flexible container through the transmission medium channel on the expansion rod. When the pressure rises, the transmission medium enables the flexible container to be expanded evenly and exerts pressure on an inner wall of the pipeline to promote the cracks to expand. During the process, breaking characteristics of the cracks are measured. Due to the fact that no transmission medium leaks in the process, a loading system and a loading process are simple, safe and low in cost.

Description

technical field [0001] The invention belongs to the technical field of industrial pressure pipeline detection, and in particular relates to a loading method for pipelines with through-cracks, especially high-temperature and high-pressure pipelines in special industries that require integrity assessment, such as high-temperature and high-pressure pipelines for power stations. Background technique [0002] Pressure pipes have a wide range of applications in the fields of petroleum, chemical industry, water supply and heating, nuclear energy and aerospace. However, due to the flammable, explosive and strong corrosion properties of the medium transported by these pipelines, and the existence of various crack defects in the pipeline due to the material itself, mechanical damage or corrosion during use, the pressure pipeline fracture accident happens sometimes. There are two main failure modes of pipelines with crack defects, namely, brittle fracture failure and leakage failure. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N3/08
Inventor 董建令惠虎李笑天雒晓卫孔祥卫徐宇张启江
Owner TSINGHUA UNIV
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