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Method and device for determining safe fracture toughness of pipeline

A fracture toughness and determination method technology, applied in the direction of applying stable tension/pressure to test material strength, complex mathematical operations, etc., to achieve accurate and reliable calculation results, accurate determination, simple and fast calculation process

Pending Publication Date: 2021-11-30
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] To sum up, in the process of realizing the present invention, the inventors found that the prior art has at least the following problems: there is no simple and accurate method for determining the safe fracture toughness of pipelines in this field

Method used

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  • Method and device for determining safe fracture toughness of pipeline
  • Method and device for determining safe fracture toughness of pipeline
  • Method and device for determining safe fracture toughness of pipeline

Examples

Experimental program
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Embodiment 1

[0052] According to an embodiment of the present invention, a method for determining the safe fracture toughness of a pipeline is provided, such as figure 1 As shown, the method described in this embodiment includes:

[0053] Step S101, obtaining the crack tip stress intensity factor of the pipeline when the crack size reaches a preset size threshold; wherein the preset size threshold is determined based on the design working conditions of the pipeline;

[0054] In this embodiment, the design conditions of the pipeline include: the allowable wall thickness of the pipeline under preset corrosion conditions, the preset delivery pressure of the pipeline, etc., and the preset size threshold can be based on the preset Design parameters such as the allowable wall thickness under corrosive conditions and the preset delivery pressure of the pipeline are determined.

[0055] In this embodiment, the crack tip stress intensity factor of the pipeline when the crack size reaches a preset ...

Embodiment 2

[0079] This embodiment takes an X80 natural gas transmission pipeline project with a specification of φ1219×21.4mm and a design pressure of 12MPa as an example to describe in detail the method for determining the safe fracture toughness of the pipeline project at the design stage. Such as figure 2 As shown, the method includes:

[0080] Step S201, obtaining the design working condition of the pipeline;

[0081] Specifically, a comprehensive analysis of pipeline corrosion conditions shows that the treated natural gas is less corrosive. According to the annual average corrosion rate of 0.1mm and the pipeline service for 30 years, the allowable wall thickness under pipeline corrosion conditions is 18.4mm. At the same time, the delivery pressure of the set pipeline is obtained.

[0082] Step S202, obtaining the pre-measured yield strength and tensile strength of the pipeline;

[0083] Specifically, the transverse tensile specimen of the pipeline is prepared according to the re...

Embodiment 3

[0117] Corresponding to the above method embodiments, the present invention also provides a device for determining safe fracture toughness, such as image 3 As shown, the device includes:

[0118] The crack tip stress intensity factor acquisition unit 301 is configured to acquire the crack tip stress intensity factor of the pipeline when the crack size reaches a preset size threshold; wherein the preset size threshold is determined based on the design condition of the pipeline;

[0119] A safe fracture ratio determination unit 302, configured to determine the safe fracture ratio of the pipeline when the crack size reaches the preset size threshold;

[0120] The safe fracture toughness determination unit 303 is configured to determine the safe fracture toughness of the pipeline based on the crack tip stress intensity factor and the safe fracture ratio.

[0121] For details related to specific implementations such as the working principle and workflow of the above-mentioned dev...

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Abstract

The invention provides a method and a device for determining safe fracture toughness of a pipeline, a storage medium and electronic equipment, and relates to the technical field of pipeline design and integrity evaluation. The method comprises the steps that a crack tip stress intensity factor of the pipeline when the crack size of the pipeline reaches a preset size threshold value is obtained, wherein the preset size threshold value is determined based on the design working condition of the pipeline; the safety fracture ratio of the pipeline when the crack size of the pipeline reaches the preset size threshold value is determined; and the safe fracture toughness of the pipeline is determined based on the crack tip stress intensity factor and the safe fracture ratio. According to the technical scheme provided by the invention, the safe fracture toughness of the pipeline can be simply and accurately determined.

Description

technical field [0001] The invention relates to the technical field of pipeline design and integrity assessment, in particular to a method and device for determining the safety fracture toughness of pipelines. Background technique [0002] Corrosion and fracture are the two main damage modes of pipeline service. Corrosion reduces the wall thickness of the pipeline and reduces the pressure bearing capacity. Corrosion parts often become the parts where cracks initiate during service. The brittle expansion of cracks will lead to sudden fracture and failure of the pipeline. , causing significant economic loss or even personal injury. Therefore, in terms of pipeline safety, the focus should be on preventing fracture failure caused by crack defects, and the impact of corrosion damage on it should be considered. [0003] The brittle growth of the crack is related to the stress-strain state of the crack tip, and the pipe wall thickness has a great influence on the stress-strain sta...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/08G06F17/15
CPCG01N3/08G06F17/15
Inventor 王垚王海涛熊道英李仕力何勇君
Owner CHINA PETROLEUM & CHEM CORP
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