Investigation of methods to assess the operability of trunk pipelines with flaws in a combined stress state

Timerbulat Biglov

Research output: ThesisMaster's Thesis

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Despite the fact that many studies have been carried out in the oil and gas sector and there are many standard technical documents regulating the assessment of the operability of trunk pipelines (TP) with flaws, the problem of assessing the durability and operability of main pipelines is still present. At the moment, international starndard of the company DNV [8], which serves as the basis for Russian analogue [5] is the most comprehensive method for determining operability and residual strength of trunk pipelines with defects. However, they do not consider taking into account axial and bending loads when evaluating pipeline sections with interacting defects. The aim of the scientific work is is to improve the standard technical documentation of trunk pipelines with defects subjected to combined loading. As a result of the work, comprehensive analysis of technical documentation and theoretical methods was performed. Considering different flaw options numerical model for assesment of residual strength of trunk pipeline in combined stress state was created and importance of taking into account bending stresses was proven using the Ansys software package. Improved methodology for assessing the operability of trunk pipelines with interacting flaws taking into account longitudinal stresses was obtained. In addition, the ability to take into account the actual location of the defect relative to the applied loads was added to the methodology.
Translated title of the contributionUntersuchung von Methoden zur Beurteilung der Funktionsfähigkeit von Stammleitungen mit Fehlern im kombinierten Spannungszustand
Original languageEnglish
Awarding Institution
  • Montanuniversität
  • Gumerov, Aidar, Supervisor (external), External person
  • Hofstätter, Herbert, Co-Supervisor (internal)
  • Chevelcha, Elena, Supervisor (internal)
Award date21 Oct 2022
Publication statusPublished - 2022

Bibliographical note

no embargo


  • Standard technical documentation
  • Finite element modeling
  • Trunk pipeline
  • In-Line inspection
  • Residual strength

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