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Engineering Failure Analysis
journal homepage:www.elsevier.com/locate/engfailanal
Inspections, statistical and reliability assessment study of corroded pipeline
O. Bouledroua
a,b,⁎, D. Zelmati
c, M. Hassani
caLPTPM, Hassiba Ben Bouali University of Chlef, Esalem City, 02000 Chlef, Algeria
bSonatrach/Direction Centrale Recherche & Développement, Avenue du 1er Novembre, 35000 Boumerdès, Algéria
cResearch Center in Industrial Technologies (CRTI), P. O. Box 64, Cheraga, Algiers 16014, Algeria
A R T I C L E I N F O Keywords:
Corroded pipeline burst test Probability of failure Failure assessment diagram Finite element analysis
A B S T R A C T
The purpose of this work is to examine some points of views on the burst pressure standards assessment for a pipeline with internal and/or external corrosion defects. The proposed work contains three major parts. First, we used several analytical and numerical methods with the use of Ansys Software. The goal is presenting different aspects concerning burst pressure standards computation of real burst test. The second part shows an experimental study in order to check the inspections standards using an intelligent pig tool over a 48 km of a pipeline located in Algeria.
All detected defects in the corroded pipeline are statistically analyzed. Thefinal part, the relia- bility indexβof the corroded pipeline subjected to internal pressure is estimated by using the SORM reliability approach.
1. Introduction
Several burst pressure predictive models of pipeline steel have been developed in recent years. The main goal is to predict the burst pressure of the corroded pipeline with an accurate way [1–3]. For instance, B.Keshtegar et al. [4] have proposed a modified response surface model based on a novel learning procedure using a harmony search algorithm. The work present good results concerning predicting the burst pressure of corroded pipelines with different steel grades. The following works illustrate thefield of work of numerical and experimental analysis of burst test which motivate this piece of research. H.YiShuai et al. [5] have developed a new model to predict the burst pressure for corroded pipeline by usingfinite element method. S·Al-Owaisi et al. [6] have studied the effect of defect shape and it is orientation on the burst pressure using an experimental andfinite element analysis. G.Fekete et al. [7]
have reported the effect of the corrosion metal loss on the burst pressure of the corroded steel pipelines. H.Liu et al. [8] have studied the effect of corrosion defects dimensions on the burst pressure with comparison between the burst test, the evaluation criteria and the Finite Element Method. K.Jung Yeom et al. [9] have conducted afinite element and full scale hydrostatic comparison of an API X70 pipeline steel. K.J.Yeomet al [10]. have been confronted the results of the effect of corrosion defect length and depth on the burst pressure of API X70 pipe with the commonly used standards.
The procedure of the Notch-based Failure Assessment Diagram so-called‘NFAD’is well studied with full details in recent years [11–13]. For example, M. Hadj Meliani et al. [11–12] have conducted an experimental verification and codes comparison of pipeline steel burst test considering a corrosion surface defect as a semi-elliptical notch. Yu. G. Matvienkoet al [13]. took into account the concept of notch stress intensity factor that builds on an NFAD for the notch-like defect. In addition, the authors in Refs [13–19] took into account afinite notch tip radius. The constraint-modified FAD has used to compute the safety factors associated with spherical
https://doi.org/10.1016/j.engfailanal.2019.02.012
Received 27 September 2018; Received in revised form 6 February 2019; Accepted 14 February 2019
⁎Corresponding author at: LPTPM, Hassiba Ben Bouali University of Chlef, Esalem City, 02000 Chlef, Algeria.
E-mail addresses:[email protected],[email protected](O. Bouledroua).
Engineering Failure Analysis 100 (2019) 1–10
Available online 23 February 2019 1350-6307/ Published by Elsevier Ltd.
