Estimation of residual stresses for multi-layer circumferential welds of oil and gas pipelines

Kychma, A. O.; Predko, Rostuslav Yaroslavovych

doi:10.29354/diag/112396

Cited by 2 publications

(1 citation statement)

References 16 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Let us analyze the obtained formulas on a numerical example. We take into account that on the intermediate support of the overpass of the oil pipeline, the reaction is equal to P = 9 kN (this value was obtained experimentally during the examination of the support node of one of the overpasses of the Druzhba oil pipeline in the Carpathians (Ukraine) [54,55]). The diameter of the pipe is 720 mm, and the wall thickness is 9.5 mm.…”

Section: The Formula To Determine the Additional Hoop Stresses In The...mentioning

confidence: 99%

Analytical Model of Interaction of an Oil Pipeline with a Support of an Overpass Built in a Mountainous Area

et al. 2023

View full text Add to dashboard Cite

Today, pipelines are the safest and most economical way to transport petroleum products and one of the key components of modern energy infrastructure. Nevertheless, pipeline systems are associated with certain risks that can lead to environmental disasters. The idea of carrying out this study was initiated by the results of the survey of the overpasses of the long-used oil pipelines laid in the mountainous area of the Carpathian region. Defects such as a change in the shape of the pipe and local bulges in the area of oil pipeline support nodes were detected. The explanation of the described problem is separate from the typical algorithms of design calculations, which are offered to manufacturers by current directive documents. The desire to provide an explanation and quantitative assessment of the detected defects became the main motivation for writing the article. An analytical model of the interaction of the oil pipeline with the rigid support has been developed. Additional internal loads in the cross-section of the pipe and displacement of its middle surface, which arise as a result of such interaction, are determined. The method of determining the reaction in the intermediate support of the overpass of the oil pipeline has been developed, considering the properties of the soil base in the underground sections and the mounting gap in the support node. The analytical dependence was obtained to determine the additional hoop stresses that arise in the oil pipeline due to the contact of the pipe with the support. The unambiguous relationship between the maximum additional hoop stress and the reaction in the support node was established. The dependence of additional hoop stresses on the geometric characteristics of the pipes was analyzed. The obtained research results are tested on the real structure of the overpass of the Druzhba oil pipeline, built in the Carpathians. In general, a simple engineering technique has been developed that allows analyzing the behavior of the oil pipeline support node and provides the numerical correction to the traditional strength assessment formulas, which determine the equivalent stresses in the oil pipeline.

show abstract

Section: The Formula To Determine the Additional Hoop Stresses In The...mentioning

confidence: 99%

Analytical Model of Interaction of an Oil Pipeline with a Support of an Overpass Built in a Mountainous Area

et al. 2023

View full text Add to dashboard Cite

show abstract

Effect of welding axial stresses on the strength of a welded pipe joint with a defect

Dzyubyk,

Soloviov

2024

Vib. proced.

View full text Add to dashboard Cite

The use of an integrated approach to determining the static strength of operated main pipelines with surface defects makes it possible to take into account the effect of residual weld stresses in combination with operational loads. In this case, it is important to determine the nature of the welding stress distribution for welded structures made of high-strength steels. Here, there is non-uniformity of stresses concerning magnitude and gradient, which is due to technological methods. A mathematical model of the experimental-calculation method is proposed. Such a model allows describing such stresses. A two-parameter criterion for brittle-tough fracture of a material which takes into account the influence of residual stresses is used. It is shown that the combination of residual stresses and operating loads has a significant effect on the safety factor. At the same time, conditions are possible under which compressive residual stresses have a favourable effect on the static strength of a pipeline with a defect.

show abstract

Estimation of residual stresses for multi-layer circumferential welds of oil and gas pipelines

Cited by 2 publications

References 16 publications

Analytical Model of Interaction of an Oil Pipeline with a Support of an Overpass Built in a Mountainous Area

Analytical Model of Interaction of an Oil Pipeline with a Support of an Overpass Built in a Mountainous Area

Effect of welding axial stresses on the strength of a welded pipe joint with a defect

Contact Info

Product

Resources

About