PSI - Issue 26

Available online at www.sciencedirect.com Structural Integrity Procedia 00 (2019) 000 – 000 Available online at www.sciencedirect.com ScienceDirect

www.elsevier.com/locate/procedia

ScienceDirect

Procedia Structural Integrity 26 (2020) 417–421

The 1 st Mediterranean Conference on Fracture and Structural Integrity, MedFract1 Calculation of burst pressure of pipeline with local defect Vladimír Chmelko *, Martin Garan, Igor Berta Slovak University of Technology, Faculty of Mechanical Engineering, Námestie Slobody 17, 812 31 Bratislava, Slovakia

Abstract

© 2020 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/) Peer-review under responsibility of MedFract1 organizers In the operation of transport piping systems, there are situations when the wall of the pipeline is locally weakened by corrosion, weld defects or other defects. There is practically no analytical solution to such cases in terms of pipeline integrity. FEM simulation is a good tool for solving such cases. In particular two questions will be discussed: Which material model should be used and what will be the pipeline destruction criterion. The propose methodology of numerical simulations of burst pressure is experimentally confirmed on the steel X52. Good conformity with the experimentally achieved bursting pressures gives a presumption of its use also for the assessment of pipeline integrity in connection of local defects with other operational influences. © 2020 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/) Peer-review under responsibility of MedFract1 organizers Keywords: pipe; integrity; defect; burst pressure Operation of pipeline systems insists high demands on their reliability. This requirement is further highlighted in the operation of high-pressure piping systems and pipeline systems passing near residential areas. The complexity and difficulty of ensuring operational safety of piping systems is that the design conditions in operation may change. These factors include additional stresses introduced into the pipeline during assembly, corrosion defects, weld defects, additional bending stress due to subsoil instability, and others. The issues of assessing pipeline integrity under the influence of these factors are given particular attention in the case of older pipelines after multi-year operation. Normative regulations (ASME, DNV) often lead to unduly conservative results. In this article, attention will be paid to the safety of pipeline operation with local weld defects (Fig. 1), especially to the simulation methodology for the burst pressure calculation. 1. Introduction

* Corresponding author. Tel.: +421 2 57296225; fax: +0-000-000-0000 . E-mail address: vladimir.chmelko@stuba.sk

2452-3216 © 2020 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/) Peer-review under responsibility of MedFract1 organizers

2452-3216 © 2020 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/) Peer-review under responsibility of MedFract1 organizers 10.1016/j.prostr.2020.06.053