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51314-4123-Corrosion Assessment, Corrosion Allowance and Integrity Management A Risk Based Methodoloy

Product Number: 51314-4123-SG
ISBN: 4123 2014 CP
Author: Binder Singh, Ioana C. Grigorescu, Qiang Zeng
Publication Date: 2014
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$20.00
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The role of internal (mainly CO2 related) corrosion for offshore and subsea infrastructures is now
evolving into a major topic of interest. Corrosion assessment and its control, particularly (but not
exclusively) in wet hydrocarbon containing environments, is a critical step in the Integrity Management
(IM)process. Typically the focus is on general or uniform corrosion alone since that can be more
effectively modeled, and software (private, JIP and public domain) exists to facilitate that accordingly. In
real world applications the corrosion that causes the problems is almost entirely localized and multimechanistic.
Thus there is a major disparity between the modeling corrosion predictions, laboratory
testing, and actual field observations. Historically that aspect has been accepted since actual corrosion
issues usually occur well into the asset life cycle. However, that is no longer the case with the deeper
more demanding high pressure, high temperature, high velocity (HP/HT/HV) conditions and physical
flow regimes, transients, excursions etc. present in newer (green field) offshore assets. With such
developments inspection and effective monitoring are not always easily adaptable, due to economics,
workability, cost and safety issues. Existing (brown field) developments present different challenges,
but can also benefit from measured corrosion and integrity data ‘fine tuning’ over the life cycle. In recent
years a strong case has been made to utilize the principles of inherently safer designs (ISD), key
performance indicators (KPI`s), and risk management techniques in terms of fully integrated materials
selection, and corrosion assessment in context of the safety driven ALARP condition. The recent spate
of high profile corrosion issues and failures has stimulated this move. This paper examines such issues
and critically argues the shift in thinking to address this contentious and largely unresolved area of
corrosion management.

The role of internal (mainly CO2 related) corrosion for offshore and subsea infrastructures is now
evolving into a major topic of interest. Corrosion assessment and its control, particularly (but not
exclusively) in wet hydrocarbon containing environments, is a critical step in the Integrity Management
(IM)process. Typically the focus is on general or uniform corrosion alone since that can be more
effectively modeled, and software (private, JIP and public domain) exists to facilitate that accordingly. In
real world applications the corrosion that causes the problems is almost entirely localized and multimechanistic.
Thus there is a major disparity between the modeling corrosion predictions, laboratory
testing, and actual field observations. Historically that aspect has been accepted since actual corrosion
issues usually occur well into the asset life cycle. However, that is no longer the case with the deeper
more demanding high pressure, high temperature, high velocity (HP/HT/HV) conditions and physical
flow regimes, transients, excursions etc. present in newer (green field) offshore assets. With such
developments inspection and effective monitoring are not always easily adaptable, due to economics,
workability, cost and safety issues. Existing (brown field) developments present different challenges,
but can also benefit from measured corrosion and integrity data ‘fine tuning’ over the life cycle. In recent
years a strong case has been made to utilize the principles of inherently safer designs (ISD), key
performance indicators (KPI`s), and risk management techniques in terms of fully integrated materials
selection, and corrosion assessment in context of the safety driven ALARP condition. The recent spate
of high profile corrosion issues and failures has stimulated this move. This paper examines such issues
and critically argues the shift in thinking to address this contentious and largely unresolved area of
corrosion management.

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