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Failure pressure assessment method for annularly aligned adjacent defective pipelines

A defect and pressure technology, which is applied in the field of failure pressure assessment of circumferentially aligned adjacent defective pipelines, can solve problems such as inability to give accurate failure pressure assessment results, and achieve the effect of making up for low prediction accuracy

Pending Publication Date: 2022-07-01
ZHENGZHOU UNIV
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  • Claims
  • Application Information

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Problems solved by technology

Therefore, the change of the number of adjacent defects in the circumferential direction does not affect the axial projection and effective length, and the existing 2b level evaluation method cannot give accurate failure pressure evaluation results

Method used

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  • Failure pressure assessment method for annularly aligned adjacent defective pipelines
  • Failure pressure assessment method for annularly aligned adjacent defective pipelines
  • Failure pressure assessment method for annularly aligned adjacent defective pipelines

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Embodiment Construction

[0019] In order to make the purposes, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only It is a part of the embodiments of the present application, but not all of the embodiments. The components of the embodiments of the present application generally described and illustrated in the drawings herein may be arranged and designed in a variety of different configurations. Accordingly, the following detailed description of the embodiments of the present application provided in conjunction with the accompanying drawings is not intended to limit the scope of protection of the present application as claimed, but merely represents selected embodiments of the present application. Based on the em...

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Abstract

The invention relates to a method for evaluating the failure pressure of annularly-aligned adjacent defective pipelines, and the method comprises the steps: building and verifying a finite element model of a defective pipeline composed of two annularly-aligned adjacent defects based on an elastic-plastic finite element method, calculating the failure pressure caused by the interaction of the corrosion defects by considering the change of the circumferential distance between two adjacent circumferential aligned defects; according to the calculation result of the failure pressure, the effective depth dnm of the adjacent defects is obtained, and the dnm is substituted into a failure pressure calculation formula to obtain the failure pressure pf of the annularly-aligned adjacent defect pipelines. The method has the advantages that a more accurate failure pressure evaluation method is provided for the effective depth of the annularly aligned adjacent defects with interaction, and the defect of low prediction precision of the type of defects in a conventional method is overcome.

Description

technical field [0001] The invention relates to the technical field of pipeline structures, in particular to a method for evaluating the failure pressure of circumferentially aligned adjacent defective pipelines. Background technique [0002] Subsea pipelines are inevitably affected by corrosion during the service process, resulting in a decrease in the wall thickness of the pipeline and a decrease in the bearing capacity of the pipeline; corrosion defects on the surface of the pipeline can exist alone or in a concentrated manner; each corrosion defect will change the interior and surrounding of the defect. Two or more defects whose affected areas overlap are called adjacent defects, and the failure behavior of adjacent defect groups is much more complicated than that of isolated defects; The interaction has an important influence on the failure mode and bearing capacity of the corroded pipeline, resulting in the decrease of its internal pressure bearing capacity, and the fa...

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Application Information

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IPC IPC(8): G06F30/23G06F119/14G06F113/14
CPCG06F30/23G06F2119/14G06F2113/14
Inventor 方宏远孙明明王念念李斌
Owner ZHENGZHOU UNIV
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