Preliminary communication

https://doi.org/10.17559/TV-20180708213323

Effect of Over-Pressure on Pipeline Structural Integrity

Igor Martić ; Innovation Center of the Faculty of Mechanical Engineering, Kraljice Marije 16, 11020 Belgrade 35, Serbia
Aleksandar Sedmak orcid.org/0000-0002-5438-1895 ; University of Belgrade, Faculty of Mechanical Engineering, Kraljice Marije 16, 11020 Belgrade 35, Serbia
Nenad Mitrović ; University of Belgrade, Faculty of Mechanical Engineering, Kraljice Marije 16, 11020 Belgrade 35, Serbia
Simon Sedmak ; Innovation Center of the Faculty of Mechanical Engineering, Kraljice Marije 16, 11020 Belgrade 35, Serbia
Ivana Vučetić ; Innovation Center of the Faculty of Mechanical Engineering, Kraljice Marije 16, 11020 Belgrade 35, Serbia

Abstract

The effect of proof over-pressure on pipeline structural integrity using fracture mechanics parameters is analysed in the case of pipeline in Reversed Hydro Power Plant, made of High Strength Low Alloyed steel with 800 MPa tensile strength due to special design requirements. To assess its structural integrity, extensive testing of the full-scale prototype had been performed, including hydrostatic pressurizing. Since plastic strain was recorded during proof over-pressurizing, special attention is given to the fact that this is actually a mechanism for crack initiation and propagation. To investigate this effect micromechanical modelling is considered, as well as the Failure Assessment Diagramme. It is shown that over-pressuring has potential detrimental effect on pipeline safety, i.e. structural integrity.

Keywords

over-pressure; pipeline; structural integrity; risk matrix

Hrčak ID:

221014

URI

https://hrcak.srce.hr/221014

Publication date:

12.6.2019.

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