Finite element-based intelligent analysis method for strength of pipeline with defects

An intelligent analysis and finite element technology, applied in special data processing applications, instruments, electrical digital data processing, etc., can solve a lot of time problems

Inactive Publication Date: 2013-03-06
E TECH ENERGY TECH DEV CORP
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Problems solved by technology

However, every time an evaluation is performed, a model that matches the actual sit...

Method used

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  • Finite element-based intelligent analysis method for strength of pipeline with defects
  • Finite element-based intelligent analysis method for strength of pipeline with defects
  • Finite element-based intelligent analysis method for strength of pipeline with defects

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Embodiment 1

[0036] An intelligent analysis method for the strength of pipelines with defects based on finite elements, the process can be found in figure 1 , including the following steps:

[0037] 1) Simplification of the design model

[0038] Referring to "GB / T 18590-2001 Corrosion Pitting Evaluation Method for Metals and Alloys", several common forms of volumetric internal corrosion defects are simplified into regular cylindrical, crock, spherical and conical types. This patent In the example, the cylindrical defect shape is taken as an example. The oil and gas pipeline material used in this model is X60, and the pipeline specification is Φ356×12.7mm. According to St. Venant’s principle, in order to eliminate boundary effects, the length of the finite element model is 3 to 5 times the diameter of the pipeline, and the length of the pipeline is 1000mm. 1 / 4 pipeline model can be found in figure 2 .

[0039] 2) Finite element mesh division

[0040] After the geometric model is estab...

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Abstract

The invention relates to a finite element-based intelligent analysis method for the strength of a pipeline with defects and belongs to the technical field of pipeline strength analysis. The finite element-based intelligent analysis method for the strength of the pipeline with defects comprises the following steps of: 1) building a practical model according to the geometrical shape of the defects; 2) dividing a finite element mesh, namely selecting a three-dimensional 10-noide tetrahedron element to carry out free mesh division; 3) loading boundary conditions for the designed model, namely loading boundary constraint and pressure load; 4) calculating for solving a stressed pipeline model, namely calculating for solving the stressed pipeline model according to different corrosion defect shape groups; 5) extracting the calculation result, namely extracting the strain value of the stress on the external wall of the pipeline around the defect; 6) building a stress mathematical model of the external wall of the pipeline; 7) building a software estimation system, namely programming the pipeline critical strain value in the software according to the standard so as to estimate the pipeline. The method provided by the invention can be used for not only making up the conservative property of the conventional evaluation, but also preventing plenty of time from being spent in building a complex model, and the precision meets the engineering needs.

Description

technical field [0001] The invention belongs to the technical field of pipeline strength analysis, in particular to an intelligent analysis method for pipeline strength with defects based on finite elements. Background technique [0002] At present, long-distance oil and gas pipelines will inevitably suffer from corrosion during operation. Corrosion will seriously affect the strength and service life of pipelines, and pose a threat to the safe and reliable operation of oil and gas pipelines. [0003] Aiming at the problem of single-point corrosion defects in pipelines, there are currently two types of monitoring and detection methods. One type can only monitor the corrosiveness of the medium online, which reflects the corrosion rate of the transported medium; the other type can only periodically detect pipeline defects, and respond What is more important is the approximate shape of the corrosion defect of the pipeline, and the obtained detection results cannot make a judgmen...

Claims

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Application Information

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IPC IPC(8): G06F17/50
Inventor 胡欣
Owner E TECH ENERGY TECH DEV CORP
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