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Long Term Structural Integrity Considerations for Abandoned Pipelines

Picture for Long Term Structural Integrity Considerations for Abandoned Pipelines
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This paper presents a technical case study for an assessment approximating the remaining strength of an abandoned pipeline subject to long term corrosion degradation, considering both general metal loss, and randomized pitting and perforation growth.

Product Number: 51317--9456-SG
ISBN: 9456 2017 CP
Author: T. J. Prewitt
Publication Date: 2017
Industry: Pipelines, Tanks, and Underground Systems
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There has been increasing interest across the industry to better understand the possible long term risks associated with out of service pipelines. In Canada the Canadian Energy Pipeline Association (CEPA) Petroleum Technology Alliance of Canada (PTAC) and the National Energy Board (NEB) have undertaken multiple studies to identify and assess the threats related to pipeline abandonment.The primary hazards typically identified across industry for pipeline abandonment are associated with long term corrosion degradation potential for creation of water conduits possible environmental impacts and potential for pipeline collapse and associated soil subsidence. Unfortunately little guidance is presently available to the industry for determining remaining structural capacity of a heavily corroded pipeline to establish likelihood and possible timeline of collapse nor for determining possible subsidence magnitudes associated with large diameter transmission lines.This paper presents a technical case study for an assessment approximating the remaining strength of an abandoned pipeline subject to long term corrosion degradation considering both general metal loss and randomized pitting and perforation growth. The work presented used a combination of finite element analyses and existing industry models for determining load bearing capacity of an abandoned pipeline under varying levels of degradation.

Key words: Abandonment, simulation, corrosion, integrity

There has been increasing interest across the industry to better understand the possible long term risks associated with out of service pipelines. In Canada the Canadian Energy Pipeline Association (CEPA) Petroleum Technology Alliance of Canada (PTAC) and the National Energy Board (NEB) have undertaken multiple studies to identify and assess the threats related to pipeline abandonment.The primary hazards typically identified across industry for pipeline abandonment are associated with long term corrosion degradation potential for creation of water conduits possible environmental impacts and potential for pipeline collapse and associated soil subsidence. Unfortunately little guidance is presently available to the industry for determining remaining structural capacity of a heavily corroded pipeline to establish likelihood and possible timeline of collapse nor for determining possible subsidence magnitudes associated with large diameter transmission lines.This paper presents a technical case study for an assessment approximating the remaining strength of an abandoned pipeline subject to long term corrosion degradation considering both general metal loss and randomized pitting and perforation growth. The work presented used a combination of finite element analyses and existing industry models for determining load bearing capacity of an abandoned pipeline under varying levels of degradation.

Key words: Abandonment, simulation, corrosion, integrity

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