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RAM Review Methodology Presentation
Date: 12-September-2011 Akram M. Suliman, Ph.D.
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Contents
IntroductionAssumptions
Methodology
RAMModelRAMBasedDecisions
References
23October2011 Contents
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ScopeandObjectivesToreviewtheoverallavailabilit offacilitiesand
confirmthattheoverallsystemavailabilitytargetfromwellheadstoexportpointfromtheterminal
thedesignproductionrate)whichincludesany
plannedorunplannedinterruptions.Thestudyshouldconfirm/challengethetarget
availabilityandprovideabasisforadjustingthistar etifitisdrivin com lexit intothedesi n.
OutofscopePipelineandpigtraps
33October2011 ScopeandObjectives
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Contents
IntroductionAssumptions
Methodology
RAMModelRAMBasedDecisions
References
43October2011 Contents
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Reliability
Reliabilityisdefinedastheprobabilitythataspecifieditemwillperformaspecifiedfunction
withinadefinedenvironment,foraspecifiedlength
oftime.
T ere ia i ityrequirementisnorma yspeci ie intermsofthemeantimebetweenfailures(MTBF)or
,
operatinghours.
53October2011 Introduction
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RELIABILITYTERMINOLOGY
FailureRateFailurerate=Lambda= =f/n
Wheref=thetotalfailuresduringagiventimeintervalandn =thenumberofunitsoritemsplacedontest.
MTBF=Theta= =1/
Reliabilityofasingledevice=R=et
63October2011 Introduction
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Maintainability
itemwillberestoredtooperatingcondition,withinagivenperiodoftime,usingprescribedproceduresand
resources.
Themostcommonlyusedmeasureofmaintainabilityisemean me orepa r .
Wherethelogisticaldelaysarentconsidered
time(MART).
3October2011 Introduction 7
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Maintainabilitydesignrequirements
accessibility
selfdiagnosticfeatures(builtintest)/condition
handlingprovisions
logisticsrecommendations
3October2011 Introduction 8
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Availability
thatanitemorsystemisavailabletoperformitsdesi natedfunctionunder ivenconditions ata
giveninstantintimeoroveratimeinterval,
assumingthatgivenexternalresourcesareprovided.
3October2011 Introduction 9
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RAM Review Methodology [email protected]
Contents
IntroductionAssumptions
Methodology
RAMModelRAMBasedDecisions
References
103October2011 Contents
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Assumptions1. 100%Availabilitycorrespondsto110%DCQ
2. Plannedshutdowns
and
planned
maintenance
down
townisnotconsideredinmissiontime(Conservative
3. Inclusionorexclusionofindirectsubsystemslikethe
F&Gorfirefightingshallbedecidedaccordingtothe.
4. Subsystemsofnoconsequenceontheplantavailabilityshallnotbeconsidered.
5. MissiontimeForequipmentknown/expectedtobeusedotherthan8760hrs/yearshallbetheknown/expectedworkinghours.
113October2011 Assumptions
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Assumptions(Contd)6. ResponsetimeshallbeassumedtobeZERO(because
responseteamsareavai a eatsite un essa vise
otherwisebyCOMPANY.7. MaintainabilityisasubsetofAvailability.
8. Repairandmaintenancerestoreequipmenttooriginalcondition.
9. Sensitivityanalysis (ifrequired)shallbebasedonmultiplicationsofannualoperatingtimesonly(i.e.noequipmentdeteriorationordepreciationshallbeconsidered)foramaximumperiodoftheleastoftheintervalbetween
p anne ma ntenance ort econcerne equ pmentor veyears.
10. Criticalityrankingshallbebasedonavailabilityvaluesonly.
123October2011 Assumptions
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Contents
IntroductionAssumptions
Methodology
RAMModelRAMBasedDecisions
References
133October2011 Contents
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RBD Reliabilityblockdiagram
failureandsuccesscriteriagraphicallyandtousetheresultin lo icdia ramtoevaluates stem
reliabilityparameters.
Individualunitsarerepresentedbyblocksthatareconsideredtoexistinoneofonlytwopossible
states,operatingorfailed.
143October2011 Methodology
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Sim leReliabilit BlockDia ram
153October2011 Methodology
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Systemreliability
severalcomponents.
reliabilityandhowcomponentsareconfiguredasa
logicalstructure. Thebasicsystemreliabilitystructuresare:
Seriesstructure(NooN)
Parallelstructure(1ooN)
K outofNstructure(KooN)
163October2011 Methodology
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ExamplefromOREDA
173October2011 Methodology
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RAM Review Methodology [email protected]
Contents
IntroductionAssumptions
Methodology
RAMModelRAMBasedDecisions
References
183October2011 Contents
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SerialorSubSysID. Subsystem
NumbersOff(N*
X%) KOON
Overallsubsystem
Reliability
Overallsubsystem
availability
Wellsite
Reception
Separation
Condensate
stablization
etc.
193October2011 RAMModel
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Serialor
Equipmen
t/
Equipmen
t/
Compone
Numbers
Off(N*
Annual
operating KOON
CriticalFailureRate
(Per10^6hrs)
Active
RepairResponse
Time(hrs)
Timeto
Repair
Failures
(Active
Overall
Equipmen
t/
Compone
Overall
Equipmen
t/
Compone
ntID.nt
Response
time)
nt
Reliabilityavailabilit
y
Lower Mean Upper
Slug
catcher
K.O.Drum
Pump
203October2011 RAMModel
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Contents
IntroductionAssumptions
Methodology
RAMModelRAMBasedDecisions
References
213October2011 Contents
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RAMBasedDecisionEquipmentSparing(Redundancy)
Usingbinominal
distribution
formula
(KOON)
for
the
two
proposedphilosophiesof2x100%vs.3x50%.
in
i
n
ki
iinSPPCtR
=
= )1)(()(
Assumption:componentreliability=98%
R[(2003)x50%]=0.998816=99.88%
x
=
.
=
.Decision:Thesparingphilosophyofchoiceshallbe2x
100%
223October2011 RAMBasedDecisions
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Contents
IntroductionAssumptions
Methodology
RAMModelRAMBasedDecisions
References
233October2011 Contents
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References
DocumentAkrma M.Suliman, QualityControlEngineeringin
NaturalGasProduction LectureNotes, 2011.
NORSOKStandard Z016RegularityManagement&, .
Oreda OffshoreReliabilityDatabook,PreparedbySINTEF,
4thEdition 2002,and2"Edition 1992
Centerforchemicalprocesssafety,GuidelinesforProcessEquipmentReliabilityDatawithDataTables,AIChE 1989
243October2011 Refrences
