Fatigue and failure of steel of offshore gas pipeline after the laying operation

Poberezhny, L.; Maruschak, Pavlo; Prentkovskis, Olegas; Danyliuk, Iryna; Pyrig, Taras; Brezinová, Janette

doi:10.1016/j.acme.2016.03.003

Cited by 24 publications

(14 citation statements)

References 24 publications

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“…Erosive wear is one of the factors that reduce the residual life of pipelines. The erosive wear of the pipe wall is especially dangerous for the pipelines that have been operated for more than 35…40 years (Maruschak et al 2013(Maruschak et al , 2014(Maruschak et al , 2016a(Maruschak et al , 2016b(Maruschak et al , 2018Vilkys et al 2018;Poberezhnyi et al 2016;Poberezhny et al 2017;Lytvynenko et al 2018;Panin et al 2017). Therefore, a comprehensive study of the erosive wear of the pipe wall in gas mains is particularly relevant.…”

Section: Introductionmentioning

confidence: 99%

Modeling Computational Fluid Dynamics of Multiphase Flows in Elbow and T-Junction of the Main Gas Pipeline

Doroshenko

Zapukhliak

et al. 2019

Transport

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The research was performed in order to obtain the physical picture of the movement of condensed droplets and solid particles in the flow of natural gas in elbows and T-junctions of the linear part of the main gas pipeline. 3D modeling of the elbow and T-junction was performed in the linear part of the gas main, in particular, in places where a complex movement of multiphase flows occurs and changes its direction. In these places also occur swirls, collisions of discrete phases in the pipeline wall, and erosive wear of the pipe wall. Based on Lagrangian approach (Discrete Phase Model – DPM), methods of computer modeling were developed to simulate multiphase flow movement in the elbow and T-junction of the linear part of the gas main using software package ANSYS Fluent R17.0 Academic. The mathematical model is based on solving the Navier–Stokes equations, and the equations of continuity and discrete phase movement closed with Launder–Sharma (k–e) two-parameter turbulence model with appropriate initial and boundary conditions. In T-junction, we simulated gas movement in the run-pipe, and the passage of the part of flow into the branch. The simulation results were visualized in postprocessor ANSYS Fluent R17.0 Academic and ANSYS CFD-Post R17.0 Academic by building trajectories of the motion of condensed droplets and solid particles in the elbow and T-junction of the linear part of the gas main in the flow of natural gas. The trajectories were painted in colors that match the velocity and diameter of droplets and particles according to the scale of values. After studying the trajectories of discrete phases, the locations of their heavy collision with the pipeline walls were found, as well as the places of turbulence of condensed droplets and solid particles. The velocity of liquid and solid particles was determined, and the impact angles, diameters of condensed droplets and solid particles in the place of collision were found. Such results provide possibilities for a full and comprehensive investigation of erosive wear of the elbow and T-junction of the linear part of the gas main and adjacent sections of the pipeline, and for the assessment of their strength and residual life.

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Section: Introductionmentioning

confidence: 99%

Modeling Computational Fluid Dynamics of Multiphase Flows in Elbow and T-Junction of the Main Gas Pipeline

Doroshenko

Zapukhliak

et al. 2019

Transport

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“…As a rule, the buried pipelines are checked by using the intelligent pigging and inspection methods. The application of these technical solutions helped to detect many dangerous defects during the pipelines' operation [16][17][18][19]. Sometimes, the shape defects were so huge that the intelligent pigging robot could not move forward.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Failure Pressure for Gas Pipelines with Combined Defects

Vilkys¹,

Rudzinskas

Prentkovskis

et al. 2018

Metals

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The paper presents the study of the influence of mechanical damage on the safe operation of gas transmission pipelines. The main types of pipeline damage with the actual parameters and their influence on the operational parameters are analysed. The damaged fractures of the section of the pipeline Kaunas (Lithuania)-Kaliningrad (Russia) were investigated in the laboratory. The main operational characteristics and the structure of the pipeline's metal after the period of long-term operation were determined using various research and experimental methods. The influence of the pipeline's damage was modelled by using the Finite Element Method and the ANSYS code. The predictions of the failure pressure were made, taking into consideration the actual properties of the pipeline's metal. Techniques including the hardness and microhardness measurement, chemical analysis, the impact strength test, and metallography analysis with an optical microscope, were used in the experimental study.

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“…is process induces the final fracture. e major part of the life is expended during crack propagation in the near-threshold ΔK region [21]. erefore, the life of crack initiation and propagation at the flaw in the near-threshold ΔK region determines the total life of a cyclic loaded component.…”

Section: Introductionmentioning

confidence: 99%

Low‐Cycle Fatigue Properties of the X70 High‐Frequency Electric‐Resistant Welded Pipes

Tian

et al. 2018

Advances in Materials Science and Engineering

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The strength, toughness, corrosion, and fatigue resistance are the main requirements for evaluating the integrity of a pipeline. In this study, the tensile strength, impact toughness, and fatigue properties of the pipe body and weld joint of an X70 high-frequency electric-resistant welded (HFW) pipe were measured and the effects of microstructure and surface defects at weld joint on properties were discussed. Results show the appearance of a weakened zone at the weld joint of the X70 HFW pipe. Nevertheless, all mechanical properties, including strength and impact energy, were superior to the specified values of the API specifications for the X70 line pipe. The reduced strength, toughness, and resistance to S-N fatigue of the weld joint caused the microstructural coarsening at the weld junction zone. However, for the specimens without surface finishing, the resistance to S-N fatigue for the weld joint was further reduced. This phenomenon was mainly attributed to the burring defects and microstructural coarsening at the heat-affected zone (HAZ). Therefore, to improve the quality of the X70 HFW pipe, refining the microstructure of weld joint and reducing the deburring defects by optimizing the postweld heat treatment (PWHT) and deburring processes should be firstly considered in the future research works.

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Fatigue and failure of steel of offshore gas pipeline after the laying operation

Cited by 24 publications

References 24 publications

Modeling Computational Fluid Dynamics of Multiphase Flows in Elbow and T-Junction of the Main Gas Pipeline

Modeling Computational Fluid Dynamics of Multiphase Flows in Elbow and T-Junction of the Main Gas Pipeline

Evaluation of Failure Pressure for Gas Pipelines with Combined Defects

Low‐Cycle Fatigue Properties of the X70 High‐Frequency Electric‐Resistant Welded Pipes

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