RCA Sepon POX2 Mech seal June 2014 SLT Report
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Transcript of RCA Sepon POX2 Mech seal June 2014 SLT Report
What Happened?
2
• Apparent Causes • At approximately 1630hrs on 16th June 2014, the POX 2 autoclave was
shutdown on ESD due to high flow differential on the seal cooling system. • Operations confirmed failure of AG205 (compartment 1), • Duty Charge pump PU-488 was not maintaining system pressure for 12+hours
due to blocked inlet strainer • Standby Charge Pump PU-487 was in manual and therefore would not
automatically start in response to system pressure
• Underlying Causes • Control logic not configured to override manual status on standby pump • Alarm was not at sufficient level to alert operator to seal pressure condition • Present process of filling Barrier Fluid tank allows entry of contaminants • Lack of routine PM to service and inspect functional operation of Seal Support
system
What Happened? Further detail
4
• Upper Seal • Stationary ring shattered, running face scored, it is suspected that this
failed @1207hrs on 16th June, venting seal chamber to atmosphere
What Happened? Further detail
5
• Lower Seal • Stationary ring radial crack though
locating hole, running surfaces OK.
Other Items
7
• Accumulators discharged • Seal Bearing defects • Seal water system build-up
in pipes
RCA Actions
8
Cause Ac)on Status DueDate FollowUpUser
Sealsystempressurelessthanautoclavepressurefor16hourspriortofailure Pressuretestremainingseals Complete 22-Jun-14 CraigHyaD
PumpPU-488suc)onstrainerblocked Flushoutandinspectcharging,circula)onandflushingsystemsonsealwaterskid,includingpipes,pumpsandfilters. Complete 22-Jun-14 AndrewDavid
Williams
PumpPU-488suc,onstrainerblocked Checktoseeifaccumulatorcanbere-charged.Re-chargeifOK Complete 22-Jun-14 AndrewDavidWilliams
NoPMforen)reSealSystemSkid DevelopaPMforthePOX2SealSystemsuchthatallelementsareinspectedandverifiedasopera)ngtoarequiredspecifica)on.ThefrequencyofthePMshouldbesetini)allytoatleast3months. Started 31-Jul-14 CJGaleoV
NoPMforen,reSealSystemSkid AddallMechsealbearingloca,onstoConMonvibra,onroute Started 26-Jun-14 CJGaleoN
Processofaddingglycerintosystemallowscontaminantstoentertank
Forthepresentsystem,installafilteronthemanualpumpusedtotopuptheBarrierfluidtanktopreventcontaminantsfromenteringinthefirstplace. Started 11-Jul-14 CraigHyaD
Processofaddingglycerintosystemallowscontaminantstoentertank
IncludeinSealSystemreview,theneedtohaveaimprovedsystemforstorageanddispensingofbarrierfluid Started 30-Jun-15 CJGaleoV
ControlSystemlogicdoesnotsupportoverrideofmanualstatus
ReviewControlsystemlogic,alarmandsetpointsforMechsealsupportskidinlinewithWCISnotesandM.Day'sobserva)ons.Ac)onshouldinclude:star)ngofstandbypumpandtheabilitytorevertittoautoifdutypumpcannotmaintainopera)onalparameters
Started 09-Jul-14 CJGaleoV
Anonaudiblecategory2Alarmwasgenerated Addalarmtosystemthatcon)nuestoAlertOperatorifSealpressurefallsbelowasafevalue Started 08-Jul-14 CJGaleoV