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8/13/2019 LTV Impact Estimation
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STVCastings
ATAnsari
ForgingFabricationFasteners
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Machining
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BusinessCase
30Windturbinesareassembledforstandardtemperatureversion(STV)
,
ForUTS,0.2%Proofstrength,%elongation,thoughspecificationsaredifferentforLTV&STVbutfromactualtestreportsassessmentcanbe
doneforqualificationtoLTV
ForSTVimpactischeckedat20C&forLTVimpactischeckedat40C
, .
STV<V
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
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Anal ze:Relationshi
Signal:
Impactvaluedecreasesastesttemperaturedecreases
At20:MaxImpact14.43atelongationof23.6%&MinImpact10.5atelongationof17%
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. . . .
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Im rove:Factor
Anal sis
Drawaregressionequationconsidering3significantfactors
Impactat40C=18.2 (0.0508*UTS)+(0.112*impact@20C)+(0.0232*YS)
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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
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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/sActual@20degree
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16.00
18.00
10.00
12.00
4.00
6.00
.
0.00
2.00
1 3 5 7 9 11 13 15 17 19 21 23 25 27 29 31 33 35 37 39 41 43 45 47 49 51
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Impact@20degree CalculatedImpact@40degree
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Thank
You
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