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Method for evaluating soil stress corrosion cracking of high-strength pipeline

A technology for stress corrosion cracking and evaluation methods, applied in the direction of weather resistance/light resistance/corrosion resistance, measuring devices, instruments, etc., can solve problems such as large losses

Inactive Publication Date: 2017-04-19
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Abstract
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  • Claims
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Problems solved by technology

Industrially developed countries generally list X80 and X100 steels as the main steels for oil and gas transmission pipelines in the 21st century. A lot of research and engineering practices have been carried out, but the higher the grade of steel, the greater the sensitivity to hydrogen embrittlement, and the occurrence of SCC in pipelines The greater the risk, the greater the loss caused by SCC in high-strength pipeline steel

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  • Method for evaluating soil stress corrosion cracking of high-strength pipeline
  • Method for evaluating soil stress corrosion cracking of high-strength pipeline
  • Method for evaluating soil stress corrosion cracking of high-strength pipeline

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Embodiment Construction

[0024] The present invention is described in further detail below in conjunction with accompanying drawing:

[0025] see figure 1 , the method for evaluating stress corrosion cracking of high-strength pipeline soil of the present invention is characterized in that, comprising the following steps:

[0026] 1) Measure the crack length and wall thickness direction depth of all surface defects, and the combined defects are determined according to the characterization method of crack defects in the standard API579-2007;

[0027] 2) Calculate the RSF values ​​of all individual flaws and combined flaws, where RSF is the residual strength factor;

[0028] Calculate the RSF value of all individual defects and combined defects using the following formula:

[0029] RSF=[(1-A / A o ) / (1-A / (MA o ))] (1)

[0030] Among them, A is the effective defect area; A 0 is the defect length multiplied by the wall thickness; M is the swelling factor.

[0031] 3) Compare the RSF to find the defect...

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Abstract

The invention discloses a method for evaluating the soil stress corrosion cracking of a high-strength pipeline. A technology for calculating the remaining strength of the pipeline under the soil stress corrosion is given through aiming at the soil stress corrosion characteristic of the pipeline and considering the interaction of defects. The interaction of the defects is an important part in the complete assessment of the pipeline. The method provides technical support for assessing the integral service life and the remaining service life of the soil stress corroded pipeline, and is of great significance to assessing the safety or not of the pipeline, preventing pipeline failure and guaranteeing safe running of the pipeline.

Description

【Technical field】 [0001] The invention relates to the technical field of safety evaluation of buried steel pipelines, in particular to a soil stress corrosion cracking evaluation method for high-strength pipelines. 【Background technique】 [0002] An external stress corrosion accident of a natural gas pipeline occurred in the mid-1960s. Since then, hundreds of stress corrosion (SCC) failures have occurred during pipeline service and pressure testing. The main characteristic of this type of SCC is the appearance of clusters of hundreds of short axial surface cracks on the pipe body. Numerous short cracks join to form one or more long surface cracks. The ratio of the length (L) to depth (d) of these linked cracks can be 50 or greater. If these cracks grow to a critical depth, they can cause costly pipeline failure. Therefore, SCC is a major pipeline integrity problem. [0003] In the 1980s, before the Canadian TransCanada Pipeline Company (TCPL) discovered SCC, the industr...

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Application Information

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IPC IPC(8): G01N3/56G01N17/00
CPCG01N3/56G01N17/00
Inventor 张良罗金恒张广利赵新伟马卫锋杨锋平李丽锋
Owner BC P INC CHINA NAT PETROLEUM CORP
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