06EpoxSUfromHot-SD---CML-521

NOTE:ThisisforTrainingonly,andisnotintendedtobeusedasastepbystepprocedure.PO/MTBEEPOXIDATIONSYSTEMSTARTUPFROMHOTSHUTDOWNGUIDELINENOTE:ThisisforTrainingonly,andisnotintendedtobeusedasastepbystepprocedure.PO/MTBETRAININGEPOXIDATIONSYSTEMSTARTUPFROMHOTSHUTDOWNGUIDELINETHISGUIDELINEHASBEENDEVELOPEDASATRAININGGUIDEANDISNOTINTENDEDTOBEUSEDINPLACEOFANYSPECIFICPROCEDUREWhenEpoxidationisinHotShutdownthefollowingGuidelineillustrateshowtostartuptheEpoxidationSystemfromastandbycondition.WiththeEpoxidationSystemisinthestandbymode,therearemanyreasonsaHOTSHUTDOWNoccursonEpoxidationReactorSystem.ThefollowingGuidelineishowtorecoverfromaHOTSHUTDOWN,stepsmustbedoneinorderforasuccessfulandresponsivestartup.WhenaHOTSHUTDOWNoccurs,theTBAFlushwillautomaticallyenterallreactorswithperoxideinjections01R0232-A/FIsothermalReactors.Thisisnormallya5.17MPagTBAFlush,ifthespareOSBLHighHeadTBAFlushPumpstartsuponlossofpressure,thesystempressureincreasesto6.21Mpag.TBAflushenteringtheIsothermalReactorscontinuesuntilOperatorcanplacespareHighHeadTBAFlushPumpintheoffposition.NOTE:ThisisforTrainingonly,andisnotintendedtobeusedasastepbystepprocedure.PO/MTBETRAININGWiththelargeamountofTBAflushenteringthereactorsystem,stepsmustbetakentopreventcooldownofIsothermalReactorsbeforethe104°CstartuppermissivetemperaturesoneachIsothermalReactorisreached.OntheStartupPermissivePageitislistedas104°C.ThesequenceforstartinguptheIsothermalReactorswillnotstartuntilalltemperaturesareabove104°Cand20minutetimeperiodhasended.Thefollowingisastep-by-stepGuidelinedescribeshowtobringthetemperaturesbackupandreduceTBAflush.GUIDELINE•CheckTBHPanalyzerAI-24719AAandAI-24719BAontheoutletofEpoxidationFirstStageAdiabaticReactorsafteraHotShutdownofthereactorstheTBAflushin01R0232-A/J,willdroptheanalyzerreadingquickly,ForreferencetheanalyzeratPNPPupdatesevery15minutes.NOTE:ThisisforTrainingonly,andisnotintendedtobeusedasastepbystepprocedure.PO/MTBETRAININGNOTIFYCONTROLOPERATORTOPLACESPAREHIGHHEADTBAFLUSHPUMPINTHEOFFPOSITIONIFPUMPHASSTARTED.NOTE:NORMALLYONAHOTSHUTDOWN,WITHFLUSHESOPEN,THISSPAREHIGHHEADTBAFLUSHPUMPISANAUTOSTART”AUXILIARYTHATSTARTSDUETODROPINSYSTEMPRESSURE.Place0%outputlimitonhighsideonthefollowingTBAflushcontrolvalves:FC-23201BFC-23201CFC-23201DFC-23201EFC-23201FNOTE:ATTHEENDOFTHESTART-UPSEQUENCE,THECONTROLVALVESWILLBEPLACEDBACKTO100%OUTPUTLIMIT.NOTE:ThisisforTrainingonly,andisnotintendedtobeusedasastepbystepprocedure.PO/MTBETRAININGNOTE:WITHIN20MINUTESOFAHOTSHUTDOWN,HV-23230STEAMTO01E0210CANBERESETIFONEOFFC-23213AORFC-23213BONPROPYLENEFEEDTOJETPUMPFLOWANDONEOFFC-23286AANDFC-23286BRECYCLEFLOWTOJETPUMPARENOTINLOW,LOWFLOWALARM.AFTER20MINUTES,THEHV-23230CANBERESETEVENIFFALL-23213A/23213BANDFALL-23286A/23286BARENOTSATISFIED.•RaiseTC-23230setpointtoEpoxidationPreheater01E0210to132.2°Cafter20minutes.NOTE:THISCONTROLLERISSETSLOWFORNORMALOPERATION,SOWILLREQUIREMANUALOPERATIONUNTILTEMPERATUREISCLOSETOREACHINGSETPOINT.MONITORTHETEMPERATURECLOSELYBECAUSETRIPVALUEOFOUTLETTEMPERATUREOFPREHEATERIS141°C.ITISCRITICALTOMAINTAINTHISTEMPERATURETOSATISFYSTARTUPPERMISSIVES.IFTHETEMPERATUREISNOTMAINTAINED,THEREWILLBEADELAYTOSTARTUPOFEPOXIDATIONSYSTEM.NOTE:ThisisforTrainingonly,andisnotintendedtobeusedasastepbystepprocedure.PO/MTBETRAINING•Open(partially)thegatevalveonthedownstreamsideofFV-23201Atoachievetheflowrateof7000kg/hrasmeasuredonFE-23201AA/23201AB.TotalflowrateoftheTBAfeedto01E0210willbe14,000kg/hr.•Afterstartup,ensuretheblockvalvesaroundFV-23201AandHV-23201Aareopen.ThisallowsthefullflowofTBAifneededforhotshutdownduringnormaloperations.Whileinventoryingepoxidationsectionoftheplant,monitorlevelintheDryTBATank.Iflevelgoestolowlowlevelthiswillresultinashutdownandepoxidationcannotbestarteduntillevelisre-established.ForreferencethelowlowlevelatPNPPis14.5ft.Thelowlowlevelforthisplantwillhavetobeestablishedindetailedengineering.•RaisePC-23230,S4steampressuretoapproximately0.379MPag,thiswillhelp01E0210maintaintemperature.•MonitorstartuppermissiveoncontrolpagetomaintaintemperaturesonEpoxidationReactorstopreventgoingintoalarmstatusthuspreventingStartup.NOTE:ThisisforTrainingonly,andisnotintendedtobeusedasastepbystepprocedure.PO/MTBETRAININGSYSTEMSTART-UPSEQUENCE•RaiseFFC-23286A/23286B,recycle/freshtoEpoxidationRecycleJetPumpstoaratioof2.50forstartuppurposes.•Ensurethatpropyleneandrecycleflowsareestablishedandaboveshutdownsetpointvalues.EnsurethatTBHPFeedPump01P0273-A/BisonandpumpingthroughTBHPTankRecirculationCooler01E0218backtoTBHPStorageTank01T0204.•Ensurethatsetpointonthedesuperheatedboilerfeedwatercontrollerto01E0210preheatercontrolvalveTC-23230issetat142°C.•VerifyTBHPinjectionsFC-23216B/C/D/E/Faresettomanualwithzerooutput.•SetfeedtoEpoxidationPreheater01E0210withFC-23216Atomanualwith15%output.NOTE:ThisisforTrainingonly,andisnotintendedtobeusedasastepbystepprocedure.PO/MTBETRAINING•SetFC-23216Kinmanualat60%output,kickbackcontrolvalveforTBHP/TBAFeedPump01P0218-A/B(thisistokeepaloadonpumpstopreventlowflowshutdown,willsetinAutomaticwhenfeedisintroducedintoEpoxidationReactorSystem).•Engage