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A framework for risk-based integrity assessment of unpiggable corroded pipelines

[+] Author and Article Information
Carlos Melo

Schulich School of Engineering, University of Calgary, Calgary, Alberta T3B2V4, Canada
carlos.melo@ucalgary.ca

Markus R. Dann

Schulich School of Engineering, University of Calgary, Calgary, Alberta T3B2V4, Canada
mrdann@ucalgary.ca

Ronald J. Hugo

Schulich School of Engineering, University of Calgary, Calgary, Alberta T3B2V4, Canada
hugo@ucalgary.ca

Alberta Janeta

Departamento de Mantenimiento, Petroamazonas EP, Quito, 170504, Ecuador
Alberto Janeta@petroamazonas.gob.ec

1Corresponding author.

ASME doi:10.1115/1.4042350 History: Received September 24, 2018; Revised December 12, 2018

Abstract

Many pipelines are unpiggable, which means they cannot be examined by in-line inspections. Existing industry practice for integrity assessment of unpiggable pipelines are not risk based which precludes optimal allocation of inspection and maintenance resources. A framework for risk-based integrity assessment of unpiggable pipelines subject to internal corrosion is presented. The framework considers localized corrosion and microbiologically-influenced corrosion by combining flow and corrosion analysis for probability and consequence analysis as part of a probabilistic risk analysis. Primary results of the application of the proposed framework shows that it is applicable and beneficial for inspection and maintenance cost optimization.

Copyright (c) 2018 by ASME
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