Bending failure evaluation method for corrosion defect contained submarine pipeline structure

Abstract

The invention discloses a bending failure evaluation method for a corrosion defect contained submarine pipeline structure. The method specifically comprises the following steps: detecting the positionand size of the maximum size corrosion defect of a pipeline; calculating the wave and current load borne by the pipeline according to pipeline detection data, working conditions and environmental conditions, and determining the maximum bending moment position and the maximum bending moment value borne by the tested pipeline finally; deducing the formula of plastic ultimate bending moment for thecorrosion defect contained submarine pipeline, and calculating the plastic ultimate bearing bending moment of the tested pipeline according to the formula; comparing the calculated maximum bending moment with the plastic limit bending moment, and judging whether the tested pipeline fails on the premise of taking into account the safety factor. The method has the beneficial effects that overall bending strength calculation and evaluation can be performed on the pipeline containing the small-range long-axis corrosion defect at any position, the finite element modeling and analysis process is omitted, the calculation difficulty is reduced, calculation efficiency is improved, and the requirement of result precision is also met.

Description

technical field

[0001] The invention relates to the technical field of failure assessment of submarine pipelines, in particular to a bending failure assessment method of a submarine pipeline structure containing corrosion defects. Background technique

[0002] In recent years, my country's demand for oil, natural gas and other resources has been increasing. The development and utilization of oil, natural gas and other resources are also becoming more and more important. As the "lifeline" for the development, production and transportation of oil and gas resources, submarine pipelines play an extremely important role in ensuring the safety of pipeline structures. Due to the complex marine environment, submarine pipelines are often suspended due to erosion and seawater erosion. When the outer anti-corrosion layer of the submarine pipeline is damaged, the seawater will erode along the direction in which the anti-corrosion layer is damaged, and it is easy to form long corrosion...

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