www.QuestIntegrity.com I Phone: +1 303 415 1475 I Fax: +1 303 415 1847 I Sales@QuestIntegrity.com Asset Longevity Plant & Pipeline Performance

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Our Capabilities n Hydro test exemptions for atmospheric storage tanks following shelland/orfloorrepairsperAPI653 nAnalysisofexcessivefloorsettlementofabove-groundstorage tanks nFitness-for-serviceincludingremaininglifepredictionsconsidering a wide range of damage mechanisms nFixedroofdesignvalidation n Earthquake risk assessment n Corrosion assessment nLeak-before-breakassessment n Recommendations for maintenance and inspection

Storage Tank Solutions

Benefits

nIdentificationofcriticalareasreducesinspectionscope,thereby increasingtimeefficiencyandminimizingdowntime. nCriticalflawsizeshelpcategorizeexistingflawsassafeor requiring immediate action. nRemaininglifeestimatesprovidereliableguidancefordetermining appropriate inspection plans. nHydrotestexemptionscansavewater,disposalcostsandweeks of downtime.

Industries Served

Weprovidefitness-for-serviceand remaining life assessment solutions to many industries and infrastructure assets including:

n Tank farms nRefiningandchemical n Syngas; e.g. ammonia production facilities nDistributionfacilities n Municipalities

Ammoniastoragetank

Stressanalysisofafixedroofconnection

Dynamicanalysisoftanksubjecttoearthquake loads

Hoop stress due to hydrostatic pressure

1/2 symmetric model of storage tank with repairs

Storage Tank Solutions

Fitness-for-Service AssessmentConfidentlyassesstanksforcracking,corrosion, deformationandremaininglifetoimprovecost efficiencyandsavetime. n Afitness-for-serviceassessmenttypically includesareviewoftheoperation,inspection andrepairhistorytoimprovetheoverall understanding of the condition of the tank. n Brittle fracture assessments are critical for

Hydro Test Exemption n Hydro tests are required following repairs to the tankbottomsorshells;however,API653allows foranexemption,providedthestructuralintegrity oftherepairedareacanbevalidated.Ahydro testexemptioncanimprovetime,resourceand costefficiency. nAPI653TankInspection,Repair,Alterationand Reconstructionprovidesguidelinesforthehydro test exemption procedure. nWehavecompletedasignificantnumberofhydro test exemptions using this standard procedure. nTheassessmentmethodemploysfiniteelement analysis(FEA)andmeasuredfracturetoughness valuesofweldedsamples. nComparingcriticaltomaximumtolerableflaw sizesintherepairedareadeteminesthe acceptability.

Hydrotestexemptionisconductedgivenahistory ofsafetankoperationandcertainkeyquantitativeoperatingvalues.Thefirstisthedeterminationof accuratestressvaluesfromtheFEA.Thesecond isthemeasureofmaterialfracturetoughness.A destructivetestisperformedusingpiecesofremovedmaterialfromtherepairedregion,whicharewelded to the new plate material using the same welding procedure.Thetestprovidesfracturetoughnessresultssothatexcessivelyconservativeassumptionscanbeavoided.

Floor Settlement AnalysisTheanalysiscanreliablypredictthefitness-for-serviceandremaininglifeofthetankdespitesevere deformation,therebyavoidingunnecessaryrepairs andincreasingoperationalandfinancialefficiency. n Floor settlement measurements from internal inspections are used to create a highly detailed tankprofilemodelforadvancedstressanalysis. nThefiniteelementanalysisincludestheproperties fromtheunderlyingfoundation;e.g.sand, concrete,structuralfill,etc.Thecontactbetween the tank and the foundation is simulated using complex modeling techniques. nThetankisanalyzedthroughseveralfillcyclesto ensure that future damage progression has ceased. nCriticalflawsizesarecomputedatpeakstress locationsandcomparedwithflawseasily detectablewithUT,MTandPTinspections.

Floor settlement stress results on an axisymmetric model

atmosphericstoragetanksoperatingatsub-zero temperatures. n Anassessmentmayincludealeak-before-break evaluation.Theleak-before-breakevaluationfollows guidelinesinpublishedfitness-for-servicestandards. n Employing finite element and fracture mechanics analyses at the critical tank regions is central in determining appropriate future inspection plans and intervals.

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QUEST INTEGRITY GROUPWe are a global leader in the development and delivery of asset integrity and reliability management services and solutions for our clients. Our solutions consist of technology-enabled, advanced inspection and engineering assessment services and products that help companies in the refining and chemical, pipeline, syngas and power industries reduce operational and safety risks, improve operational planning and increase profitability. Quest Integrity Group, a Team Industrial Services company, is built on a foundation of leading edge science and technology that has innovated and shaped industries for over forty years.