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DRJANETCOTTON
Metallurgy,Mater ialsEngineering,MechanicalFailure,Corrosion,Manufactur ing,Fabrication,
ProductPerformance
QUALIFICATIONSandEXPERIENCE
Qualifications:
• Bsc.Eng.(MaterialsEngineering)• PhD(MaterialsEngineering)UniversityofCapeTownMaterialScience• PrEng ECSA
Experience
• DirectorOneEighty(Pty)Ltd15years• LeadConsultingEngineer,FailureInvestigation,ProblemSolving,MaterialsSelection,ExpertWitness,BusinessOwner• LeadResearchandDevelopmentEngineerAdvancedMaterials
CASESTUDY1:OzoneGeneratorFailure
• OzoneGenerationisusedtoscrubfumesfromprocessplantstoremoveodours
• OzoneGeneratorisanarrayoftubescoatedwithathermallysprayedglasscoating
• Thetubesarepoweredwithhighvoltagesothatplasmaisproduced,whichchangesO2intoozone(O3)TheOzoneisusedtoscrubodours
• Ozonegeneratorfailed,byshortingout.• Rootcauseestablished:Thermalspraycoatingwasporous,allowingashort
• Betweenthesteeltubeswhenplasmawasproduced
• ClientwassuppliedwithnewOzoneGenerators
CASESTUDY2:MainEngineFailureWartsilla
• Bigendbearingfailure,fracturethroughtheconnectingrod• MainEnginesustainedirreparabledamage• Fracturesurfaceshowedevidenceoffatiguefailure,IEslowandinsidiouspropagationofacrackunderacyclicload• Oncethefatiguecrackpropagated,theconnectingrodfractureddamagingthemainengine• Failuremodeeffectanalysiswasappliedwiththemetallurgicalevidence• Therootcause:Torquesequencewasnotappliedtothebigendbolts
CASESTUDY3:CorrosionofManufacturedItems
• Evaluatethecorrosivenatureofoilssuchasconventionalandbio-oilsformetallicmaterials.
• Understandthechemicaldifferencebetweenthedifferenttypesofoils.
• Calculatethedifferentexperimentalconditionsthatwouldallowonetoconductexperimentsoverashortperiodoftimetopredicttheeffectsofdifferentoilmediumonmetallicmaterialforasignificantamountoftime.
• Thedifferenceinchemicalnatureoftheoilprovedthatbio-oilsarecorrosivetometallicmaterial.
CASESTUDY4:PastExperienceasExpertWitness
• MV“Azzure”– RudderFailure– BowmanGilfillan• MV“Lola”– StanchionFailure– ShepstoneWhiley• SeaHarvest– Corrosionfailurefirereticulationpipes– WebberWentzel Bowens• Oceana– BollardFailure– WebberWentzel Bowens• MV“Margeret”– TowRopeFailure– NortonRoseFullbright• CorrodedStructuralSteelinfertilizerfactory– MauricePhilippsWeisenberg
QUALIFICATIONSandEXPERIENCE
Qualifications:
• B.Sc.MaterialsEngineering &M.Sc.MaterialsEngineering - UniversityofCapeTown• CharteredEngineer (C.Eng MIEI)- TheInstitutionofEngineersofIreland• EuropeanEngineer (Eur. Ing.)- EuropeanFederationofNationalEngineering Associations• FireScience&Investigation– UniversityofEdinburgh /IFE• PowderMetallurgyTechnologist Level1- AmericanPowderMetallurgyInstitute• MBA– UniversityofWarwick
Experience
• Overthepast18years,employment experiencein:• Mining toolsindustry (Boart Longyear)• Medicaldevices(Medtronic)• Forensicengineering investigations(fire&explosions), workplaceaccidents&metallurgical-relatedfailures(MCA&OneEighty)
SANDYMARIAYE
Expertwitnessspecialising inchemistryandnon-metallicmater ials: Polymers,oils, paint, ceramicsand
composites.
QUALIFICATIONSandEXPERIENCE
Qualifications:
• BSc(Chemistry)• BSc(Hons)MaterialScience• MScMaterialsEngineeringUniversityofCapeTown
Experience
• ProductEngineerforResearchandDevelopmentfor4years• SeniorProjectmanagerforconsultingfor3years• Expertwitnesswork• Investigatefailure,materialselectionandprocessoptimisation.
CASESTUDY1:OilandGasIndustry– watercontaminationofoils
• Assesstheeffectsofwaterasacontaminantonthemetalliccomponentsaswellaschemicalpropertiesoftheoil.
• Determinethemaximumacceptablelevelofwaterthateverytypeofoilcancontainwithoutbeingdetrimentaltothesystemthattheyarepresentin.
• Experimentallydeterminethelevelofwaterindifferentoilsamples.• Comparetheoreticalandexperimentalresults.
• Determinepracticalwaysinwhichexcesswatercanberemoved.
CASESTUDY2:FoodandBeverageIndustry– Bottleddrinksdiscolouration
• Regulartestingofpolymericmaterialandreverseengineeringofvariousmaterialsincludingcomposites.• Testingoflacquerinsidevodkacontainingbottles.• Determinethecauseforthechangeincolour offlavoured vodka.• Researchandexperimentsconductedprovedthattheadditivesaddedtomakethedifferentflavours reactedwiththelacquerandcauselacquerdisintegrationandchangeincolour.
PastExperienceasanExpertWitness
• Forpaintcoatingsystem:Hadtodeterminetheeffectsofiron(III)oxideonadhesionpropertiesofalkydpaintsystem.
• Determinethedifferenceinadhesionproperties(intermsofchemicalandphysicalbonds)ofpaintcoatingsystemsonporousandnon-poroussubstrate.
• Severalscientificjournalswereanalysed andexperimentswereconductedtoexplainthedifferenceinbondingstrengthhenceadhesionpropertiesofpaintcoatingsonporousandnon-poroussubstrate.
PETRAGRESS
ExpertininternationalstandardsfortestingmetallicmaterialsandWeldProcedureQualifications,Predictionoflifespanofmaterials,MechanicalFailures,Optimisation ofprocesses,
Materialselection.
QUALIFICATIONSandEXPERIENCE
Qualifications:
• BTech - Mechanical Engineering(with distinction)- UNISA• NationalDiploma -Mechanical Engineering- CapePeninsulaUniversityof Technology• Bachelorof Arts- BusinessAdministration(Dualcertification course “Diplom-Betriebswirt“)- Universityof CooperativeEducationRavensburg,Germany• TechnicalSignatory for mechanical &metallurgical testing - SANAS
Experience
• ProjectManagement;3DCADDesign;Cold FormTechnology/Production Processes ;Fastening Technology
• Metallurgy ;MaterialsTesting (Tensile,Bend,Impact,Hardness tests,Chemicalcomposition,Microstructural Analysis)
• Stressanalysis incl.fatigue calculations;Various failure investigations
• Variousmaterialselection studies
• ScopingWeldProcedureQualifications and determination of requirements acc.to ASMEIX,AWSD1.1&D1.6,ISO15614-1,EMMUA158
• QualityManagment and Accreditation(ISO17025)
• Expertwitness work
• Intotalover 10years experience atMTU(Germany), Zumtobel Lighting (Austria),SFSintec (Switzerland),OneEighty (SouthAfrica)
CASESTUDY1:OilandGasIndustry– gearboxfailureonoilrig
Metallurgicalinvestigation,fracturesurfaceandstressanalysisconfirmedthatatorsionaloverloadwasappliedontotheshaft.