2 Fundamentals of Corrosion

7/30/2019 2 Fundamentals of Corrosion

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Robert Gordon University and Owen S. Jenkins Ltd. 2011

Wells ModuleWells ModuleENM201ENM201

2. Fundamentals of Corrosion2. Fundamentals of Corrosion

Prepared by Owen Jenkins,M.A., C.Eng., C.Mar.Eng., F.E.I., M.I.Mar.EST., N.A.C.E., S.P.E.


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Robert Gordon University


Lecture Topic

We shall be looking at why

corrosion matters

Its impact on the businesseconomics, health, safety and theenvironment

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Robert Gordon University


Corrosion Definition

Corrosion The destruction or

deterioration of a material becauseof reaction with its environment

Most familiar as rusting andoxidation of metals

Also can include rotting of wood,breakdown of polymers and otherdeterioration processes

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Robert Gordon University Robert Gordon University and Owen S. Jenkins Ltd. 2011

Cost of Corrosion

Fontana* cites a figures of $70 billion for theUnited States in 1975, from a study performedby the National Bureau of Standards andBattelle Memorial Institute.

An updated study was conducted in 1998 andshows a figure of $276 billion, or 3.1% of GDP.NACE CC Study

However you view it, the cost is huge.

* Corrosion Engineering 3rd. Edition, by Mars G. Fontana.

McGraw Hill Book Company, 1987. ISBN 0-07-100360-6.

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http://../Wells%20ENM201/Materials%20and%20Corrosion%20OJ/NACE%20cost_corrosion.ppthttp://../Wells%20ENM201/Materials%20and%20Corrosion%20OJ/NACE%20cost_corrosion.ppt


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HSE 1

There are also major costs in terms of

Health, Safety and Environmental issues. Example

BP's pipeline failure at Prudhoe Bay,Alaska, in 2006 which resulted in theleakage of more than 200,000 gallons ofoil.

The pipeline suffered extensive corrosiondue to lack of maintenance over severalyears.

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HSE 2

U.S. Chemical Safety Board (CSB) Chairman CarolynW. Merritt Senate :

"Virtually all of the seven root causes identified for thePrudhoe Bay incidents have strong echoes in TexasCity."

These included, she said, the

significant role of budget and production pressuresin driving BP's decision-making - and ultimately

harming safety. Conclusion cutting corners and maintenance is

not only dangerous to life and the environment, it isbad business.

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Pipeline Failure at Prudhoe Bay

BP's pipeline failureat Prudhoe Bay,

Alaska, in 2006 whichresulted in theleakage of more than200,000 gallons of

oil.

The pipeline sufferedextensive corrosion

due to lack ofmaintenance overseveral years. Seeright. Photo courtesy of AP PHOTO/Rick Bowmer

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http://www.alaskajournal.com/images/031906/7825_512.jpg


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Robert Gordon University Robert Gordon University and Owen S. Jenkins Ltd. 2011 8

Wear andWear and

Corrosion inCorrosion in

44" Tubing:" Tubing:

Corrosion andCorrosion and

WirelineWirelineDamageDamage


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Tackling the Problem: 1

Understanding what corrosion is

Mechanisms causing corrosion

Adjusting the variables Materials

Operating conditions

Environment internally and externally

Interface conditions

Striking the right balance COMPROMISE ISINEVITABLE

Prevention/mitigation/allowances

All materials corrode under some conditions

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Tackling the Problem: 2

Essentials Thorough, planned inspection and

maintenance

Honest and open reporting

Making sure the little guys voice is heard

Education of staff at all levels from seniormanagement down to the cleaners They may be the people who notice that

something has corroded through first, as theyare always cleaning up the mess!

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Wells Module ENM201

2. Fundamentals of Corrosion2. Fundamentals of Corrosion

Prepared by

OWEN S. JENKINS LTD.4, Charlton Avenue, Aboyne, Aberdeenshire, AB34 5GL, United

Kingdom.Tel. +44 (0)13398 87779. Mobile phone: +44 (0)7803 296779.

Email:

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[email protected]: www.osjl.co.uk
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2 Fundamentals of Corrosion