How we create value
• Highlyreliablewithlowmaintenancerequirements
• Expertknowledgeandextensiveexperience ensuresoptimalplantselectionandsizing
• Robust,cost-effectivedesign• Effectivelycleanedbylowpressurebackwashing,minimizingenergycosts
• Consistentscreeningquality
Brackett Green® Double and Single Entry Drum ScreenAdvancedwaterscreeningtechnology
Keyfeatures&benefits
• In-to-outflowpatterneliminatesscreenbypassing
• Highdebrishandlingcapacities• Canoperatewithhighheadlosswithouttripping
• OptionofaFishRecovery andReturnsystem
• Highunitflows,minimizing thenumberofintake channelsrequired
• Producesdownwardloadseliminatingriskofscreenfloatation
• Suitablefornuclearpowerplantsafetycoolingwater
• AvailableinSingleEntry (SE)andDoubleEntry (DE)flowpatterns
• SEdrumscreensprovideall thebenefitsofDEforlowerflowapplications
• PatentedProPaPanel® technologyforwastewaterapplicationspreventshairpinning
Brackett Green® Double and Single Entry Drum Screen
Ovivo’sBrackettGreen®drumscreensaredesignedtomeettheincreasingdemandforhighcapacityfinescreeningofraworwastewatercoupledwitharobustlowmaintenanceoperation.
Overthelastcenturyalargevarietyoffinescreentypesandflowpatternshavebeendevelopedforbothrawwaterintakesandforpreliminarytreatmentofmunicipalwastewater.Eachhasoneormorelimitationsintermsofcapacity,processperformance,reliability,maintenancerequirements,andcapitalcost.However,Ovivo’srangeofdrumscreensoffersasuperiorperformanceinallofthesekeyareasandthismakesdrumscreensparticularlysuitedtoapplicationsthatdemandthehighestlevelofprocessperformancecombinedwithsuperiorreliabilityandverylowmaintenancerequirements.
OvivocanoffereithertheDoubleEntry(DE)flowpattern,usedprimarilyforlargerflowstypicallyrangingfrom8to35+m3/secortheSingleEntry(SE)flowpatternwhichoffersalltheadvantagesoftheDEdrumscreeninaformatmoresuitedtoflowsoflessthanapproximately10m3/sec,dependingonthespecificapplication.
Ovivo’sSEandDEdrumscreensbothusean in-to-outflowpatternthateliminatesthepossibilityofmateriallargerthanthemediaaperturebypassingthescreenorbeingcarried-overtothecleanside,makingthemidealfortheprotectionofdebrissensitiveprocessessuchasMBR’sorcondensers.
BrackettGreen®DrumScreen
DE Drum Screen – How it WorksTheBrackettGreen®doubleentrydrumscreensconsistsofarobustlyconstructeddrumstructurewithasolidhorizontalcentre-shaft,whichrevolvesslowlyinheavyduty,self-aligningdoublerollerbearings,lubricatedbydeckmountedoilreservoirs.
Waterflowsfromtheinsidetotheoutsideofthe drumthroughmeshpanelsarrangedarounditsperiphery.Meshpanelsarecleanedwithgreatefficiencybybackwashing,withtheassistanceofgravity,atdecklevel.
Thescreenisdrivenbyasimpledriveunitpositionedatdecklevel.Thefinaldriveisanylonpinion,whichengageswithagearringontheoutsideofthedrum.
Thedrumscreenstructurecanbedesignedtosupporthighdifferentialloadingwithoutfailureofthemeshpanels,therebyensuringthatdownstreamplantdoesnotbecomecontaminatedbyunscreenedwateranddebris.
Flow PatternWaterentersfrombothsidesandflowsradiallyfromtheinsidetotheoutsideofthedrum,creatingastructurethatisbalancedbothhydraulicallyandmechanically.Thisflowpatternensuresthatthewaterlevelinsidethedrumishigherthanoutsideofit,withtheloadsactingdownwardsontotheconcretefoundation,thuseliminatingtheriskofthedrumscreenbreakingfreefromitsfoundationsandfloatinginthechamberwhichcanleadtolengthyplantdowntime.
TheDEflowpatternproducesanoutletflowthatconvergesandthismakesthisflowpatternparticularlysuitableforclosecouplingtotheinletoftheCWpump.
BrackettGreen®DrumScreen
Debrisout
Washwaterin
Debrisout
Flowin
Screenedflowout
Cost-effectiveThehighunitcapacityofdoubleentrydrumscreenscomparedwith,travelingbandscreensmeansthatfewerunitsarerequiredforagivenintakeflowwhichcanresultinsavingsincapitalcostfortheintakecivilstructureandareductioninancillaryplantsuchascontrolsystems,coarsescreens,StopGate™
technology,andwashwatersystem.Furthermore,becauseofthehighreliabilityofdrumscreens,astandbyunitisrarelyrequiredandplantmaintenanceandoutagecostsareverylow,furthercontributingtothedrumscreen’slowwhole-lifecosts.
Purpose designedBrackettGreen’sdoubleentrydrumscreensarepurposedesignedforeachindividualintake,withspecificfeaturestosuittheparticularoperatingandsiteconditionsinstalledasnecessary.Thesecanincludeseismicqualificationandnuclearsafetyrelatedduty.Ourexperiencedengineershavedesigneddrumscreenswithaunitcapacityof35m3/sec,largercapacitiesarecurrentlybeingdesigned.
Solid shaftOvivodoesnotcompromiseinthedesignofthemainshaftandbearingassembly.Asubstantialsolid,hightensilesteelshaftisusedtosupportthescreen.
A-frame constructionA-Frameconstructionprovidesalightbutrigidstructurethatisparticularlysuitablefordrumscreensconstructedfromstainlesssteelordrumscreensthathavetobeseismicallyqualified.
DEDrumScreens-FeaturesandBenefits
Brackett Green® Double and Single Entry Drum Screen
A-Frameconstruction
SEdrumscreenfromtheinletsideOutletportofSEdrumscreen
SE Drum Screen – How it WorksTheBrackettGreen®singleentrydrumscreenisverysimilarinconstructionandoperationtothatofaDEdrumscreen,andthereforesharesthesameadvantagessuchashighreliability,lowmaintenanceandexcellentscreeningperformance.
Flow PatternWhatdistinguishestheSEfromtheDEdrumscreenistheflowpatternandscreenorientation.WiththeSEarrangementthescreenmainshaftisalignedwiththedirectionofinfluentflowwhichentersthescreenviaasingleinletport,thenpassesradiallyoutthroughthescreeningmediaandexitsbytwooutletportslocatedinthedownstreamcivilworkwall.
Thisarrangementsimplifiesthecivilworkconstruction.TheSEdrumscreenisprincipallysuitedtosmallerflowswherethereisnotapumplocatedimmediatelydownstreamoftheoutlet.
TheSEflowpatternhassomefeaturesthatmakeitparticularlysuitableformunicipalwastewaterapplications.Forexampleanysolidsthatmaysettletotheinvertoftheinletchannelgetsweptbytheflowandfalldirectlyintothescreeninlet.Alsoanoverflowweircanbeincorporatedinthebackwallwhichallowsthescreenchambertobypasstheincomingflowintheeventofoverloadorpowerloss.
BrackettGreen®DrumScreen
Flowin
Debrisout
Debrisout
Screenedflowout
Washwaterin
Cooling water intakes Ovivo’sBrackettGreendoubleentrydrumscreensareidealforinstallationonlargevolumerawwaterintakes.Theyneedlittlemaintenance,andeffectivelyremovefloatingandsuspendedsolids,protectingpumps,heatexchangersandothercriticalequipment.Fittedwithmeshrangingfrom1.5mmto10mm,thesescreenscanbeinstalledasasingleunitoraspartofatwo-orthree-stagesystem.
Wastewater treatment SEorDEdrumscreensarefrequentlyemployedonwastewaterapplicationsforscreeningoflargeinletworkflows,orforstormwaterscreening.Thescreeningofmunicipalwastewaterposessomeparticularchallengersduetothenatureofthesolids,inparticularhair,fibresandgrease.
ProPaPanel® Screening MediaAfterseveralyearsindevelopment,ourengineerspatentedascreeningmediathatwouldresist“hairpinning”formunicipalsewagescreeningapplications.TheProPaPanel®technologyisathickscreeningmediaincorrosion-resistantnonmetallicmaterialthatresistshairpinning.Ordinaryperforatedplatepanelsallowfibrousdepositssuchasbodyhair,cottonandragstostapleor‘hairpin’aroundtheplate,eventuallyblindingthescreen.
Ovivo’sBrackettGreenSEandDEdrumscreensformunicipalsewagescreeningapplicationsincorporatepatentedProPaPaneltechnologytoachievehighvolumefinescreeningwithouttheneedformultiplescreensandmultipleancillaryplant.TheProPaPanelscreeningmediaisavailablefrom6mm(~1/4”)to2mm(~1/16”)indiameter.
TheProPaPanelsystemrequiresonlyalowbackwashpressureof2.0bar(~30PSI)tocleanthescreen.Thesamewashwateristypicallyuseduptothreetimes:oncetobackwashthescreen,againtotransportthescreeningsviagravityconveyanceandathirdtimeinthescreeningsconditioningprocess.ProPaPanelscreeningmediahelpestablishesOvivo’sBrackettGreenDEandSEdrumscreensasefficient,economical,low-maintenancesolutionsforfinescreeningofmunicipalwastewater.
UnderneathofaDEdrumscreen
CloseupofOvivo’sProPaPanel® technology
Brackett Green® Double and Single Entry Drum Screen
DrumScreen–Applications
Design and analysisOvivousesstate-of-the-artcomputeraideddesignprogrammeswithAutoDeskInventorusedasthebasisfordesignanddraftingactivities.Withadvanced3Dgraphicsandmodeling,productsaredesignedfordifferentoperatingconditionsandrequirementsforitscustomers.Thissystem,inconjunctionwithourfiniteanalysispackage,alwaysensuressoundengineeringisalwaysappliedtoeachproject.
Install, commission, maintainOvivo’sserviceengineerscaninstall,commissionandmaintainallmachines.Ourteamofinternationalengineerswillvisitsitesaroundtheworldtoadviseonallaspectsofourproducts.
Ovivoisabletoprovidelong-termagreementscoveringsparesandmaintenance,relievingyou ofcostlyoverheadsbyprovidingtrainedpersonnelwhereandwhenyouneedthem–particularly duringplannedshutdowns.
Spare partsOvivoretainscomprehensiverecordsofallthemachinestheyhavebuilt.Therecordscanbeaccessedquicklyonourcomputerizedsparepartsdatabase.Allsparessuppliedaregenuine,guaranteedandsupportedbyourdetailedknowledgeofallhistoricalmodificationsorupgradeswhichmayhaveoccurredsincethemachinesweresupplied.
OurAftermarketmanagersareavailableforadviceatanytime.Wecanrecommendsuitablesparepartsforbothholdingonsiteasstrategicspares,andforyourlongtermneedsforplannedmaintenanceshutdowns.Sparescanbeex-worksordeliveredtositeforinstallation.
TrainingAsasupplierofengineeredcapitalequipment,wenaturallyofferourenduserson-siteorin-housetrainingcourses.Wehaveskilledinstructorsavailable,andcantrainyourteaminallaspectsofequipmentuse,includingdetailedinstructionsforreplacingparts,adjustmentandmonitoring.
Trainingcoursesareforindividualsonaone-to-onebasisorforgroupsofuptoeight,eitheron-siteorinourworldwideoffices.Contactoursparesandservicemanagersfordetailsofthecoursesavailable.
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