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Method of calculating arrested toughness of pipeline by full dimensional bursting test of natural gas pipeline

A natural gas pipeline and blasting test technology, applied in the field of pipeline hazard protection, can solve the problems of waste of materials, difficulty in welding, inability to accurately determine the crack arrest toughness of pipelines, etc., and achieve the effects of saving pipeline production and construction costs, good application value, and simple principle.

Inactive Publication Date: 2019-01-11
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Claims
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AI Technical Summary

Problems solved by technology

At present, the toughness of natural gas pipelines produced in China is generally high. In the blasting test, the first test tube is usually stopped at the side of the crack initiation tube, and the determined crack arrest toughness value is relatively conservative.
In addition, the difference between the toughness (Charpy impact energy) of the pipeline during the blasting test is usually 50J, so the crack arrest toughness of the pipeline cannot be accurately determined, which will cause waste of materials and increase the difficulty of welding

Method used

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  • Method of calculating arrested toughness of pipeline by full dimensional bursting test of natural gas pipeline
  • Method of calculating arrested toughness of pipeline by full dimensional bursting test of natural gas pipeline
  • Method of calculating arrested toughness of pipeline by full dimensional bursting test of natural gas pipeline

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Embodiment 1

[0040] The test steel pipe is a spiral seam welded pipe with an outer diameter of 1422mm, a wall thickness of 18.4mm, and a gas internal pressure of 13.3MPa. Pressure sensors are installed at different positions of the natural gas pipeline axially and the busbar at 45°. The pressure sensors are used to measure the test process The gas pressure inside the steel pipe, the specific arrangement is as follows figure 1 and figure 2 As shown, record the pressure-time curve of the decompression wave during the blasting process at different positions, and then obtain the pressure-speed curve of the decompression wave of the steel pipe according to the pressure-time curve of the decompression wave during the blasting process at different positions, such as image 3 Shown.

[0041] 2) Obtain the pressure-crack growth rate curve of the pipe under different toughness conditions according to the steel pipe specifications and performance parameters.

[0042]

[0043]

[0044] Where P a Crack sto...

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Abstract

The invention discloses a method of calculating arrested toughness of a pipeline by a full dimensional bursting test of a natural gas pipeline. The method comprises the following steps: putting an acquired gas pressure-reduced pressure wave velocity curve of the natural gas pipeline and an acquired pressure-crack expansion velocity cure of the natural gas pipeline in a same coordinate system; thenchanging the energy density Rdwtt of a drop weight tear test, wherein the gas pressure-reduced pressure wave velocity curve of the natural gas pipeline and the acquired pressure-crack expansion velocity cure of the natural gas pipeline are tangent; and calculating the arrested toughness of the pipeline by a full dimensional bursting test of the natural gas pipeline by taking the point of tangencyRdwtt of the gas pressure-reduced pressure wave velocity curve of the natural gas pipeline and the acquired pressure-crack expansion velocity cure of the natural gas pipeline as critical arrested toughness energy density for arrested toughness of the natural gas pipeline. The method can be used for precisely determining the arrested toughness of the natural gas pipeline.

Description

Technical field [0001] The invention belongs to the field of pipeline hazard protection, and relates to a method for calculating pipeline crack arrest toughness by using a full-scale blasting test of a natural gas pipeline. Background technique [0002] During the service process of natural gas pipelines, due to factors such as corrosion, geological disasters, product quality defects and other factors, local metal loss occurred under certain conditions, causing pipeline leakage. After the natural gas pipeline leaks, due to the high pressure in the pipeline, a large amount of gas escapes from the leakage point, and at the same time, crack propagation occurs at the leakage position. The long-range propagation of dynamic ductile cracks is one of the important failure modes of high-pressure natural gas pipelines. In severe cases, the cracks will propagate as long as several kilometers and cause serious economic losses and impacts. Therefore, how to accurately predict the ductile cra...

Claims

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Application Information

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IPC IPC(8): G01N3/12G01N3/30
CPCG01N3/12G01N3/30G01N2203/0019G01N2203/0039G01N2203/0066
Inventor 杨坤沙婷封辉陈宏远李鹤
Owner BC P INC CHINA NAT PETROLEUM CORP
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