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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