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  • 8/7/2019 Failure Analysis Methodology Thepetrostreet

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    FailureAnalysis

    Methodology

    All rights reserved to thepetrostreet.com

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    preliminarycauseoffailureandaftertakinga

    ,

    takeninordertoavoidrecurrenceinfuture

    allrightsreservedtothePetroStreet team

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    HistorydatacollectionSamplescollection

    Preliminaryexamination(VT)NDT

    Mechanical Testin

    FailureAnalysis

    MacroscopicExaminationMicroscopicExamination

    MetallographicExaminationeterm nat ono a ure ec an sm

    ChemicalanalysesSpecialTests(simulations)

    Conclusions/Reporting

    allrightsreservedtothePetroStreet team

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    ToDoItems: Goals:All

    the

    files

    and

    records

    related

    to

    the

    failedpartbemadeavailableonyour

    workingtable

    Collection

    of

    all

    of

    the

    following:Specificationsheetofthecomponent

    Manufacturingdesigndata

    So tcopieso scanne reports,emai

    notifications,correspondencewith

    vendors

    /

    manufacturerPhoto ra hsofallthe revious

    Inserviceinspectionrecor s

    Failuresoccurinthepast

    Latest

    modification

    made,

    if

    anyLastfailuremode ifavailable

    inspectionsshallbelookedinto Reportsofpastfailureanalysis,ifany

    Photographicrecords

    allrightsreservedtothePetroStreet team

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    ToDoItems: Goals:ReachthesiteatyourearliestLookforthefailedpartsandpieces

    Surveyofthewholeareaalongwithother

    FailedpartandpiecestobecollectedPhotographsshallbetakenimmediately

    Lookforotherevidences

    skilledinspectors

    Discussionswiththeoperatingstaff

    Listencarefullytotheeyewitnesses,if

    Operatingconditionsatthatspecifictime

    Interviewtheeyewitnesses

    Listentoeverybodypresentatthesite

    allrightsreservedtothePetroStreet team

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    Goals:ToDoItems:Generalassessmentofbasicdesignandworkmanshipbemade

    Apparentsurfacedefectswhichcanbe

    Thoroughvisualexaminationwithoutanycleaning

    Photographyofthefracturedpartand

    seenwithnakedeyemustbelogged

    Theoriginalshapejustafterfracturebe

    savedforreference

    surfaces

    Groupdiscussionswithinspectors

    partsandsurfaces

    Makeareportofpreliminaryexamination

    allrightsreservedtothePetroStreet team

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    Goals:ToDoItems:Cracks,flaws,discontinuities,metalthicknesslossandothersurfaceorbelow

    surfacedefectsmustbepickedupusing

    ApplicableNDTtobemade:DyePenetrant Testing

    MagneticParticleTesting

    applicableNDTtechniques

    FormationofallappliedNDTreports

    includingalltheobservations/

    UltrasonicTesting

    Radiography

    EddyCurrentInspection

    allrightsreservedtothePetroStreet team

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    Goals:ToDoItems:Evaluateifdesiredmechanicalattributespresentinthefailedpart

    Ifnotthenevaluatewhatwaswrong

    Mechanicalattributesofthefailedparttobeconsidered

    Whythatmaterialwasselected?

    amongthefollowing?

    Materialselection

    Processconditions

    Principalmechanicalpropertiesofthe

    failedpart

    SelectionofMechanicalTestingtobe.

    Hardness

    Tensile

    Impact

    Fatigue

    allrightsreservedtothePetroStreet team

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    Goals:ToDoItems:DeterminethedirectionofcrackgrowthPresenceofChevronmarks

    Determinetheoriginoffracture

    Surfaceexaminationsatmagnificationsranges1to100x

    Examinationwithunaidedeyeorhard

    lens

    Lowpoweropticalmicroscopemaybe

    used

    Originofthefractureontheleft

    allrightsreservedtothePetroStreet team

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    Goals:ToDoItems:Determinationofdimpledfracture,cleavagefacets,brittleintergranular

    fracture,hydrogenembrittlement,fatigue

    Transmissionelectronmicroscopestobeusedformagnification upto1500x

    Scanningelectronmicroscopefor

    failureetc.magnificationintherangeof10000xto

    60000x

    ResultofScanningelectron

    Microscope(SEM)

    allrightsreservedtothePetroStreet team

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    Goals:ToDoItems:Determinewhetherthematerialhastherequiredstructure

    Lookforthefollowing:

    SelectionofthemetallographicsectionsPreparationofthemetallographic

    sections

    Inclusions

    Microstructural segregation

    Decarburization

    Polishingandetching

    Improperheattreatment

    Intergranular corrosion

    allrightsreservedtothePetroStreet team

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    Goals:ToDoItems:Determineamongthefollowing:DuctileFracture

    Transgranular BrittleFracture

    CollectionofallpreviousinformationTranslatingalltheinformationtodetect

    fracturetype

    Intergranular BrittleFracture

    FatigueFracture

    StressCorrosionCracking

    HydrogenEmbrittlement

    Creep&StressRupturefailure

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    Goals:ToDoItems:Determine:Presenceofrequiredalloying

    Exactmatchwithrequiredmaterial

    AnalysisofbulksurfaceAnalysisofdeposits

    Spottests

    Extentofanydeviation

    allrightsreservedtothePetroStreet team

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    Goals:ToDoItems:RecurrenceoffailuretobeseenConcludeyourinvestigationwiththeaid

    ofsimulation

    SimulationmaybemadeifpossibleConditionsatthetimeoffailuretobe

    replicated

    Seeklaboratoryassistance

    Makeavideo,ifpossible

    allrightsreservedtothePetroStreet team

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    Goals:ToDoItems:StatereasonsoffailureProviderecommendationstoavoid

    recurrence

    WritedownthemethodologyadoptedWorkperformedandresultsfound

    Assembleallthepicturesandvideos

    Makeacompletepresentationinvolving

    laboratoryreports

    allrightsreservedtothePetroStreet team

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    Formoredetails&information,pleasecontactus.

    thePetroStreet Team

    [email protected]


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