Stress-strain State Of Pipeline Research Articles

MODERN DIAGNOSTICS METHODS OF MAIN PIPELINES AND PROSPECTS FOR APPLICATION OF DIGITAL TECHNOLOGIES

Background Due to the wear and tear of the main pipeline transport systems, the problem of improving the complex methods of their technical diagnostics is of paramount importance. The article provides an analysis of diagnostic methods for main pipelines, considers visual, ultrasonic, magnetic, capillary methods, as well as the prospects for the development of digital technologies in this area. It is important that each of the existing diagnostic methods allows you to identify only certain parameters of defects. The main tasks when using such methods include the assessment of the corrosion and stress-strain state of pipelines, which is directly related to the determination of the service life. One of the approaches to determining the resource of exploitation is the use of modeling and digital technologies. The ability to combine and analyze the information obtained in the process of diagnostics, which is inextricably linked with the features of operation, carrying out calculations using computer programs is a valuable achievement of our time. Aims and Objectives Analysis of the complex of diagnostic works, which includes: o detection of internal and external defects of pipe surfaces; o measurement (determination) of geometric parameters of defects; o leak detection; o detection of violations of protection zones of main pipelines; o checking the state of electrochemical protection and its effectiveness; o measurement of mechanical deformation and displacement of sections of the main pipeline; o checking the condition of pipeline fittings; o determination of the condition of the shell and the depth of the laying of the main pipewire; o measurement of pipeline wall thickness and metal hardness; o determination of pipe geometry errors. Results Methods for optimization of diagnostics of main pipelines are proposed, which consist in an integrated approach to diagnostics of the inner surface of a main pipeline using the method of acoustic emission, which allows: o identify dangerous interruptions in production and operation at an early stage and prevent their development to a critical level; o determine the degree of risk of detected defects; o conduct 100% inspection of the diagnosed area, including areas inaccessible for visual control; o estimate the remaining service life of the pipeline based on information about existing failures and damages. The perspective possibilities of using digital technologies to optimize the process of diagnostics and monitoring are considered.

NON-CONTACT METHOD OF ESTIMATION OF STRESS-STRAIN STATE OF UNDERGROUND PIPELINES DURING TRANSPORTATION OF OIL AND GAS

Development and implementation of contactless methods for determining the stress-strain state of pipelines in the process of transportation of energy hydrocarbons is important for ensuring its safe operation. The authors developed a method for determining the change in the stress-strain state of the underground part of the main oil and gas pipelines according to the data about the displacement of a certain set of points of the axis of the pipeline. This study was conducted on a linear section of the main gas pipeline, where a landslide in 2010 created a force pressure on the pipeline, resulting in a pipeline rupture.

Численное моделирование напряженно-деформированного состояния трубопровода при пучении грунта

Численное моделирование напряженно-деформированного состояния трубопровода при пучении грунта

Thermoelastic stress-strain state of pipelines with expansion joints

A method is developed for approximate calculation of the thermoelastic stress-strain state of a section of a pipeline containing cylindrical and corrugated parts and operating under internal pressure with uniform heating. Determination of the stress-strain state in an approximate formulation is reduced to the calculation of a cylindrical sheel and one half-corrugation on the assumption that all of the half-corrugations are identical. The problem is solved within the framework of the Kirchhoff-Love hypotheses on the basis of equations of the theory of small elastoplastic strains. The method which is developed is used to study the character of the stress-strain state of a shell of revolution modeling a full-scale pipeline section. The calculated results agree well with experimental data.