PSI - Issue 17

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

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Procedia Structural Integrity 17 (2019) 520–525

ICSI 2019 The 3rd International Conference on Structural Integrity Safety of pressure pipe operation with corrosive defect Chmelko, V. 1,* , Biro D. 2 1 Slovak University of Technology, Faculty of Mechanical Engineering, Institute of Applied Mechanics and Mechatronics, Námestie slobody 17, 812 31 Bratislava, Slovak republic, ICSI 2019 The 3rd International Conference on Structural Integrity Safety of pressure pipe operation with corrosive defect Chmelko, V. 1,* , Biro D. 2 1 Slovak University of Technology, Faculty of Mechanical Engineering, Institute of Applied Mechanics and Mechatronics, Námestie slobody 17, 812 31 Bratislava, Slovak republic,

2 Slovak Gas Distribution Industry (SPP-distribúcia), Mlynské Nivy 44/B, 825 11 Bratislava, Slovak republic 2 Slovak Gas Distribution Industry (SPP-distribúcia), Mlynské Nivy 44/B, 825 11 Bratislava, Slovak republic

Abstract Abstract

The criterion of pipeline operation safety presents the ratio between the burst and the operation pressure. Correctly set values of burst pressure in the pipelines are a distinct task only in case of ideal pipe, as for such a case, there exist an analytical solution. In the actual operation however, the burst pressure value is influenced by the floor status, pipe surface corrosion defects, and further aspects, which can hardly be quantified. The authors state in the article, that the utilization of semi-empiric relations from the standards DNV-RP-F101 or ASME B31G, can lead to biased results. Experimental measurements of burst pressures can quantify these biases. The methodology of destructive pressure calculation for pipeline with local weakness of wall thickness using the numerical models which are verified by direct measuring of those pressures is presented. The crit rion of pipeline op ration safety presents the ratio between the burst and the operation pressure. Correctly set values of burst pressur in the pipelines are a distinct task only in case of ideal pipe, as for such a case, there exist an analyti al solution. In the actual operation however, the burst pressure value is influenc d by the floor status, pipe surfac corrosion defects, and further aspects, which can hardly be quantified. The authors state in the article, that the utilization of semi-empiric relations from the standards DNV-RP-F101 r ASME B31G, can lead to bi sed results. Experim ntal measurements of burst pressures can quantify these bi ses. The methodology of estructive pressure calculation for pipeline with local weakness of wall thickness using the numerical models which are verified by direct measuring of those pressures is presented.

© 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ICSI 2019 organizers. © 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ICSI 2019 organizers. © 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ICSI 2019 organizers.

Keywords: pipe; corrosion; defect; operation; Keywords: pipe; corrosion; defect; operation;

1. Introduction 1. Introduction

The safety of the operation of pressure pipelines in the transport of various media is not important only in terms of engineering point of view but also in terms of environmental impact. Safety factor of design pressure can be changed during operation caused by factors such as a reduction of wall thickness caused by corrosion, or additional bending stress, which can be revealed by monitoring systems developed by Chmelko 2016 and Garan 2017, 2019. The safety of the operation of pressure pipelines in the transport of various media is not important only in terms of engineering point of view but also in terms of environmental impact. Safety factor of design pressure can be changed during operation caused by factors such as a reduction of wall thickness caused by corrosion, or additional bending stress, which can be revealed by monitoring systems developed by Chmelko 2016 and Garan 2017, 2019.

* Corresponding author. Tel.: +421 (2) 57 296 225 E-mail address: vladimir.chmelko@stuba.sk * Correspon ing author. Tel.: +421 (2) 57 296 225 E-mail address: vladimir.chmelko@stuba.sk

2452-3216 © 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ICSI 2019 organizers. 2452-3216 © 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ICSI 2019 organizers.

2452-3216  2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ICSI 2019 organizers. 10.1016/j.prostr.2019.08.069