Assessment of internal pressure effect, causing additional bending of the pipeline

Bakhtizin, R. N.; Зарипов, Р. М.; Коробков, Г. Е.; Масалимов, Р. Б.

doi:10.31897/pmi.2020.2.160

Cited by 11 publications

(6 citation statements)

References 1 publication

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“…The temperature and pressure of the gas entering the pipeline should be considered when calculating the gas pipeline for stability. As noted above, the equivalent axial compression force P is appeared due to changes in temperature and high pressure of the gas; the following formula determines Force P [27]:…”

Section: Objects and Methods Of Researchmentioning

confidence: 99%

Upheaval buckling of underground pipelines of complex configuration located in liquefied soils

Mardonov,

Mirzaev,

Nishonov

et al. 2023

E3S Web of Conf.

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The problem of loss of stability of underground pipelines with a middle part in the form of a straight or П-shaped part located in liquefied soils is considered in the article. The pipeline lifting process occurs under the action of buoyancy force in the liquefied soil zone and then under the action of the longitudinal compressive force that appears due to the temperature of the transported product and its pressure. The problem is solved by the finite element method. The results are presented as a table and graphs of changes in the values of transverse displacements along the coordinate depending on the pipeline geometric characteristics and the soil rheological properties. It is established that the П-shaped part is a damper against pipeline buckling.

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Section: Objects and Methods Of Researchmentioning

confidence: 99%

Upheaval buckling of underground pipelines of complex configuration located in liquefied soils

Mardonov,

Mirzaev,

Nishonov

et al. 2023

E3S Web of Conf.

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show abstract

“…There are two kinds of velocities for nonlinear directional wave propagation in polyethylene pipe, group velocity, and relative velocity. With the extension of propagation distance, directional waves with different frequencies will be separated (39), which will cause large-area dissipation of directional waves in a certain time domain and cause interference with the extraction of characteristic signals (40,41). Therefore, when choosing non-directional waves, try to choose directional waves with slow speed changes (42).…”

Section: Nonlinear Directional Wave Detectionmentioning

confidence: 99%

Method for Assessing Damage to Gas Distribution Network Pipelines based on Nonlinear Guided Wave

Palaev G.,

Fuming,

Yifan

2024

IJE

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Polyethylene pipeline is an essential infrastructure of gas distribution network, and there are some problems such as complex damage assessment and tedious assessment process. How to choose an effective damage assessment method for polyethylene pipelines is the focus of the implementation of the gas distribution network at present. In this paper, a nonlinear directional wave method is proposed to detect the damage of polyethylene pipeline by an acoustic wave, and the damage results of polyethylene pipeline are searched. The rationality of this method is verified by calculating the aerodynamic equation.The results show that the nonlinear fixed wave method can accurately determine the damage and crack propagation degree of the pipeline and simplify the damage assessment process, and the results are superior to the linear directional wave method. Therefore, the nonlinear directional wave can be used to assess the damage to ethylene pipelines in gas distribution networks, which has strong rationality and practicality and provides support for the actual pipeline damage assessment.

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“…Therefore, timely detection of the pipeline section where the pipe wall was hydrogenated is a possible method of failure prevention [13][14][15]. The above conclusion is valid for both compressed hydrogen pipelines, where local hydrogenation of the pipe wall cannot be excluded, e.g., due to plastic deformation caused by soil movement [16] and other bending stresses [17][18][19], and pipelines carrying natural gas and oil products [20][21][22]. At the same time, currently existing methods of detecting increased hydrogen content in metal structures, both by measuring its concentration directly or indirectly-based on the change in mechanical properties of the metal-are destructive, since both use specimens cut from the analysed structure for research.…”

Section: Introductionmentioning

confidence: 99%

Using the Magnetic Anisotropy Method to Determine Hydrogenated Sections of a Steel Pipeline

Bolobov

Latipov

Zhukov³

et al. 2023

Energies

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The paper deals with a non-destructive method of detecting hydrogenated sections of pipelines, which is based on variations of the level of mechanical stresses generated in the surface layers of the steel pipe material during its hydrogenation. The use of a magnetoanisotropic method based on the phenomenon of metal magnetoelastic anisotropy development, which consists in the variation of the magnetic properties of ferromagnetic materials in direction and magnitude under the influence of mechanical stresses, is proposed as a way to register that variation. Based on the results of tensile testing of carbon steel plates with measurement of the difference in principal mechanical stresses (DPMS) occurring in metal, as well as experiments on electrolytic hydrogenation of specimens with measurement of the DPMS signal, it was confirmed that when steel structures are saturated with hydrogen, tensile stresses are generated in the surface layers, the magnitude of which increases as the concentration of hydrogen increases in the metal. In this case, it is assumed that the indicated dependence between the hydrogen concentration in the metal and the stresses arising as a result of hydrogenation is linear. For the example of lamellar specimens made of pipe low-carbon steel, the possibility of using the magnetoanisotropic method for registering sections of underground pipelines with a high content of hydrogen is substantiated, which can become the basis for a method of diagnosing sections of pipelines with broken insulation for the possibility of their further operation. The scientific novelty of this article is the establishment of a relationship between the hydrogen content in the metal, the stresses that arise in this case, and the change in the magnetic properties of ferromagnetic materials, characterized by the magnitude of the DPMS signal. This study contributes to the understanding of the process of hydrogenation of metals, and may be useful in detecting and preventing damage to gas and oil pipelines caused by hydrogen embrittlement as a cause of stress corrosion.

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Assessment of internal pressure effect, causing additional bending of the pipeline

Cited by 11 publications

References 1 publication

Upheaval buckling of underground pipelines of complex configuration located in liquefied soils

Upheaval buckling of underground pipelines of complex configuration located in liquefied soils

Method for Assessing Damage to Gas Distribution Network Pipelines based on Nonlinear Guided Wave

Using the Magnetic Anisotropy Method to Determine Hydrogenated Sections of a Steel Pipeline

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