LTV Impact Estimation

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    Suzlon Energy L td.

    STVCastings

    ATAnsari

    ForgingFabricationFasteners

    1

    Machining

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    BusinessCase

    30Windturbinesareassembledforstandardtemperatureversion(STV)

    ,

    ForUTS,0.2%Proofstrength,%elongation,thoughspecificationsaredifferentforLTV&STVbutfromactualtestreportsassessmentcanbe

    doneforqualificationtoLTV

    ForSTVimpactischeckedat20C&forLTVimpactischeckedat40C

    , .

    STV&LTV

    Canwearriveatroughestimatedimpactvalueat40Cfortechnical

    decisionmaking?

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    Define

    ProjectName AssessmentofSTVcastingsforLTVsuitability

    Objective

    Arrive

    at

    rough

    estimated

    impact

    value

    at

    40C

    for

    technical

    decisionmakingofSTVcastingsforacceptanceunderLTV

    TurbineConversion willprovidedirectlygivehugebenefitofcash

    inflowfor

    turbines

    which

    are

    currently

    on

    ground

    as

    inventory

    ProjectTeamAbdullahAnsari(ASQCSSBB)

    Mr.Seenivasa Ragavan (HeadQA

    SEFORGE)

    Schedule Measure Analyze Improve Control

    24Jan2013 27Jan2013

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    Measure:Test

    Pro ram

    PlannedActions

    control

    ConductnormaltestingforSTV

    ConductadditionalimpacttestforLTV

    Recordthe

    data

    for

    analysis.

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    Measure:Test

    Data

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    Anal ze:Relationshi

    6

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    Anal ze:Relationshi

    Signal:

    Impactvaluedecreasesastesttemperaturedecreases

    At20:MaxImpact14.43atelongationof23.6%&MinImpact10.5atelongationof17%

    7

    . . . .

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    Im rove:Factor

    Anal sis

    Drawaregressionequationconsidering3significantfactors

    Impactat40C=18.2 (0.0508*UTS)+(0.112*[email protected])+(0.0232*YS)

    8

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    Control:Validate

    the

    E uation

    9

    Outof14actualimpactvaluesat40,3doesnotmatchverycloselywithresultof

    regressioncalculation

    &

    11

    actual

    values

    match

    within

    1Joule

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    Wa

    Forward:Recommendations

    Whileconductingthisstudysomeotherparametersareconsidered

    meetingstandardnorms,sametobeverifiedbeforeusingthisequationto

    estimateimpactofLTV,whichare

    Nodulecount/Nodularity

    NoduleSize&Shape

    UTS,YS,Elongation

    lowerthanactualvalue(iftested)by1Joule.E.g.ifcalculatedis7Jitcan

    beactually6Jalsowhentested

    Thisequation

    is

    not

    an

    alternate

    to

    actual

    impact

    testing

    at

    40C,

    hence

    tousedonlyforcastingswhicharereleasedinassembly&whereimpact

    testforLTVisnotpossible.

    Decisionmustbetakenbyqualifiedpersonnelonlyandmustbe

    documented.10

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    Suzlon Energy L td.ActualDatawithcalculatedestimateofimpactat40degree

    11

    Version Min Max Avg

    STV 10.26 15.53 14.10

    LTV 5.73 7.03 6.36

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    Suzlon Energy L td.ComparisonofCalculatedimpactvalues

    w

    c uaComparisionofCalulatedImpactvaluesat

    40degreev/[email protected]

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    [email protected] [email protected]

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    Suzlon Energy Ltd.Suzlon Energy Ltd.

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    Thank

    You

    14