Calculation method of limit internal pressure of steel pipeline in good condition

Abstract

The invention relates to a calculation method of limit internal pressure of a steel pipeline in a good condition, which belongs to the technical field of the construction of pipelines. According to the method, on the basis of a uniform strength theory, and on the basis of considering the wall thickness and actual strain of the steel pipeline, an analytical solution for the limit internal pressureof a closed pipeline and an open pipeline in a good condition can be deducted. The inverse analysis is performed for the internal pressure damage data in the pipeline which is actually in a good condition to obtain a yield criterion adaptive to different steel pipelines of different hardening indexes n, and the limit internal pressure range of the closed pipeline and the open pipeline can be obtained by combining a limit internal pressure calculation formula. On the basis of considering the influence of the wall thickness of the steel pipeline and the actual strain when in the failure of the internal pressure, the good pipeline limit internal pressure calculation method is deducted, and the result is more accurate. According to different yield criterions adaptive to different steel pipelines of different material attributes when the internal pressure is damaged, by calculating the actual explosion test data, the upper and lower limit value range can be given to the explosion pressure of the closed pipeline and can better meet the practical requirement, and the value range is convenient for the design personnel and construction personnel to refer.

Description

technical field [0001] The invention belongs to the technical field of pipeline construction, and in particular relates to a method for calculating the ultimate internal pressure load of a buried steel pipeline or a submarine steel pipeline. Background technique [0002] As a representative of the maximum bearing capacity of the pipeline, the burst pressure is usually defined as the ultimate load or failure pressure of the pipeline at plastic failure. Numerous theoretical, numerical and experimental studies have been carried out on the burst pressure of pipelines subjected to internal pressure. In the actual production and application process, safety accidents of pressure pipelines occur from time to time. In order to obtain a calculation model that can accurately predict the burst pressure of pipelines, many experts and scholars at home and abroad have carried out a lot of research on this from theoretical, numerical and experimental aspects, and have proposed many analyti...

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a more accurate ultimate internal pressure of intact steel pipelines based on the deficiencies of the above-mentioned prior art, on the basis of considering the deformation of pipelines, and according to the respective strength theories suitable for pipelines with different material properties. The calculation method effectively improves the accuracy and operability of the calculation of the limit internal pressure of the intact pipeline

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