TBA-PURIF.SD-TO-STANDBY-617

NOTE:ThisisforTrainingonly,andisnotintendedtobeusedasastepbystepprocedure.PO/MTBETBAPURIFICATIONCOLUMNSYSTEMSHUTDOWNTOSTANDBYNOTE:ThisisforTrainingonly,andisnotintendedtobeusedasastepbystepprocedure.PO/MTBETBAPurificationColumnSystemShutdowntoStandbyPurposeThepurposeofthisprocedureistoplacetheTBAPurificationColumnSystemintotalrefluxintheeventofatemporarystoppageoffeedandeffluentflows.TheactofplacingthesystemintotalrefluxistoapplytheproperofamountofreboilersteamflowtocreateenoughvaporsintheoverheadsystemtomaintainasteadyandcontinuousrefluxflowratewhiletherefluxdrumlevelcontrollerisinAutomaticcontrol.ConditionsAtemporarylossoffeedfromupstreamequipmentoratemporarystoppageofeffluenttodownstreamequipmenthasoccurred.Inashutdowntostandbycondition,onlythecontrolvalveswillbeclosedusingthevalve'scontrollerunlessacontrolvalveissuspectedofleakingthrough.Inthosespecialcases,ablockvalvewillhavetobemanuallyclosedtoeliminatetheleakage.GUIDELINE•ShutdowntheTBHPConcentrationColumnVentCondenserPump.•ClosetheFVfeedvalvefromtheTBHPConcentrationColumnRefluxDrumwithFC.NOTE:ThisisforTrainingonly,andisnotintendedtobeusedasastepbystepprocedure.PO/MTBETBAPurificationColumnSystemShutdowntoStandby•MonitorthecolumnoverheadpressurewithPCtoensurethecolumndoesnotover-pressureorgointoavacuumstate.•MonitorthereboilerfeedtemperatureasdisplayedbyTI.•MonitorthecolumntraytemperaturesasdisplayedbyTI’s.•MonitortherefluxdrumlevelwithLC...…Iftherefluxflowisincreasing,reducethereboilersteamflowbyplacingthesteamflowcontrollerinLocal/Automaticcontrolandreducetheflowsetpointwhichwillreducetheboiluprate...…iftherefluxflowrateisfalling,increasethereboilersteamflowbyplacingthesteamflowcontrollerinLocal/Automaticcontrolandincreasetheflowsetpointwhichwillincreasetheboiluprate.•Maintainthecolumnintotalrefluxuntilthecolumnfeedisre-established.