18/02/2015 OilyWaterSeparator:ConstructionandWorking
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OilyWaterSeparator:ConstructionandWorking
NOVEMBER17,2010BYKARANC
Tominimizetheoilycontentinbilgewater,whichcanbedischargedfromtheship,MARPOLhasaregulationunderANNEXIwhichlimitstheoilcontentinthebilgewaterthatvesselcanlegitimatelydischargeintothesea.ItisnowarequirementforallvesselstohaveanoildischargemonitoringandcontrolsystemalongwithanoilfilteringequipmentknownastheOilyWaterSeparator(OWS).
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18/02/2015 OilyWaterSeparator:ConstructionandWorking
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Asthenameindicates,thefunctionofoilywaterseparatoristoseparatemaximumamountofoilparticlesfromthewatertobedischargedoverboardfromengineroomorcargoholdbilges,oiltanksandoilcontaminatedspaces.Aspertheregulation,theoilcontentinthewaterprocessedfromtheOWSmustbelessthen15partspermillionofoil.
ConstructionandWorkingofOWS
OWSconsistsofmainlythreesegments:
Separatorunit
Thisunitconsistsofcatchplateswhichareinsideacoarseseparatingcompartmentandanoilcollectingchamber.
IVACIndustrialVacuums
PumpWetorDry!Sand,Gravel,Oil,Sludges,Water
18/02/2015 OilyWaterSeparator:ConstructionandWorking
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Heretheoilhavingadensitywhichislowerthanthatofthewater,whichmakestheformerriseintotheoilcollectingcompartmentandtherestofthenonflowingoilmixturesettledownintofinesettlingcompartmentafterpassingbetweenthecatchplates.Afteraperiodoftimemoreoilwillseparateandcollectintheoilcollectingchamber.Theoilcontentofwaterwhichpassesthroughthisunitisaround100partspermillionofoil.Acontrolvalve(pneumaticorelectronic)releasestheseparatedoilintothedesignatedOWSsludgetank.Heatermaybeincorporatedinthisunitforsmoothflowandseparationofoilandwater.
Firststagehelpsinremovingsomephysicalimpuritiestoachievefinefiltrationinthelaterstage.
TheFilterunit
Thisisaseparateunitwhoseinputcomesfromthedischargeofthefirstunit.Thisunitconsistsofthreestagesfilterstage,coalescerstageandcollectingchamber.Theimpuritiesandparticlesareseparatedbythefilterandaresettledatthebottomforremoval.Insecondstage,coalescerinducescoalescenceprocessinwhichoildropletsarejoinedtoincreasethesizebybreakingdownthesurfacetensionbetweenoildropletsinthemixture.Theselargeoilmoleculesriseabovethemixtureinthecollectingchamberandareremovedwhenrequired.Theoutputfromthisunitshouldbelessthan15ppmtofulfillegaldischargecriteria.
18/02/2015 OilyWaterSeparator:ConstructionandWorking
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Iftheoilcontentinwaterismorethan15ppmthenmaintenanceworksuchasfiltercleaningorrenewaloffiltersistobedoneasrequired.
OilContentMonitorandControlUnit
Thisunitfunctionstogetherintwopartsmonitoringandcontrolling.TheppmofoiliscontinuouslymonitoredbyOilContentMonitor(OCM)iftheppmishighitwillgivealarmandfeeddatatothecontrolunit.ThecontrolunitcontinuouslymonitorstheoutputsignalofOCMandifalarmarises,itwillnotallowtheoilywatertogooverboardbymeansofoperating3waysolenoidvalve.Therearenormally3solenoidvalvescommandedbycontrolunit.Thesearelocatedinthefirstunitoilcollectingchamber,secondunitoilcollectingchamberandoneindischargesideoftheoilywaterseparatorwhichisa3wayvalve.The3wayvalveinletisfromtheOWSdischarge,whereoneoutletistooverboardandsecondoutletistoOWSsludgetank.WhenOCMgivesalarm,3wayvalvedischargesoilymixtureinthesludgetank.
Ifyoulikedthisarticle,YoumayalsoliketoreadHowtooperateOilywaterseparator
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References
IntroductiontoMarineEngineeringByD.ATaylor
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COMMENTS
naveenrajeevsaysJune11,2014at9:48pm
sircanyoupleaseelaboratehowtotesta15ppmmonitor?
DannyFernandessaysJuly28,2014at1:12am
Couldyoupleasegiveareasonaswhy15ppmischosenasthemaximumfigureforOilyWaterSeparator?
18/02/2015 OilyWaterSeparator:ConstructionandWorking
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JoeSchwierkingsaysOctober24,2014at9:24am
NaveenRajeev,
Theproceduresfortestingthemonitoraredetailedinthemanufacturestechnicalmanual.TheOWSsIhaveexperienceutilizeaphotosensorthatmeasurestheamountoflighthittingit.Whenoilorsedimenttravelsbetweenthelightandthephotosensor,itreducestheamountoflighthittingthesensorandcausesthemonitortodisplayaPPMofcontaminateinthewater.OntheOWSsIhaveseen,themanufactureprovidesplastictesttripsthathavebeengaugedtosimulateoilywatercontamination.Thistesttripisplacedbetweenthelightandthephotosensorthroughaninlineaccesspoint.Themonitorshoulddisplaythepredeterminedreadingwhenthistestisconducted.Shipsalsosendthesesensorsouttobetestedandcalibratedonascheduledbasis.
MDNURHOSENsaysJanuary6,2015at8:25pm
inthefigureatsecondstagetherearetwosensorconnectedtocontrolboxwhatisthefunctionofthattwosensor
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