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BulletinP-10-501a(E)TechnicalInformationandDesignCharacteristicsDurcoMarkIIIAlloyPumps•ANSIStandard•Sealmatic•UnitizedSelf-Priming•RecessedImpeller•Lo-FloMKIIITECHBULLETIN-112/5/0211:00AMPage2DanK.SnelsonREDManuals-2:TECHNICALBULLETINS:MKIIITECHP-10-501:2MarkIIIANSIStandardPumpPage4PowerEnds5Shafts&Sleeves6ShaftMaterials&Data7Shafts&Bearings8DeflectionGraphs9IsocorrosionGraphs10SealSentry™11-14DurcoShield™15Impellers16-17Lo-Flo™18CasingOptions19DurcoShield™15Ultralign™20Low/HighTemperature21BaseLine™22-27PerformanceCurvesPage28Interchangeability29Pressure/TemperatureRatings30SuctionPressureRatings31GeneralData32MinimumFlow33FastenerStandards33GroupIParts34GroupII&IIIParts35Pump/BaseplateDimensions36Materials37HowToSpecify38MarkIIISealmaticPages39-43MARKIIIPUMP&ENHANCEMENTSTECHNICALDATASEALMATICHeavy-dutychemicalservicepumpsarepre-ferredaroundtheglobe.Exclusivefeaturesimprovepumpreliabilityandextendmeantimebetweenplannedmaintenance(MTBPM).Durcopumpsareamongtheindustryleadersinhydrauliccoverageandefficiency.Dynamicallysealedpumpeliminatestheneedforconventionalmechanicalseals.PumpsdeliveredworldwidearemanufacturedinFlowservefacilitiescertifiedeithertoISO9001ortoISO9002.LLOYD’SREGISTERQUALITYCOMPANYISO9001QualitySystemCertificateDurcoMarkIIIANSIProcessPumpsMKIIITECHBULLETIN-112/5/0211:00AMPage3DanK.SnelsonREDManuals-2:TECHNICALBULLETINS:MKIIITECHP-10-501:3MarkIIISelf-PrimingPages44-48PrimingTanks49-51SELF-PRIMINGMarkIIIRecessedImpellerPages52-55RECESSEDIMPELLERPowerMonitorPages56-57POWERMONITORGoodPumpPracticePages58-59GOODPUMPPRACTICELocatedoutofthesump.Reducescostsofverticalpumpoptionsandsimplifiesmaintenance.Vortexactionassurestrouble-freepumpingoflargediametersolidsandslurries.Alsoselectedforshearsensitivemedia.Protectspumpsfromcostlydamageduetoimproperopera-tionatbothhighandlowhorse-powerloadpoints.Observingthesesevenprinciplesof“GoodPumpPractice”cansignificantlyextendMTBPM.MKIIITECHBULLETIN-112/5/0211:00AMPage4DanK.SnelsonREDManuals-2:TECHNICALBULLETINS:MKIIITECHP-10-501:FLOWSERVECORPORATIONDAYTON,OHIO,U.S.A.ANSI3PUMPEQUIPNO.SIZEALLOYSEALSEALCODECAPRPMPOTMPSERIALNO.BASETYPETDHMDPSGVCE01/944BaseplatesizeSealtypeormodelTDHMaximumdesignpressure(at100°F)SpecificgravityViscosityDateassembledLocationwherebuiltHowToIdentifyDurcoMarkIIIProcessPumpsAnexampleofthenameplateusedontheMarkIIIpumpisshownbelow.ThisnameplateisalwaysmountedontheMarkIIIbearinghousing.Customer’sequipmentnumberPumpsizeAlloySealmanufacturerSealcodeCapacityRPMCustomer’spurchaseorderTemperatureSerialnumberUniqueFeaturesExtendMTBPMImprovedpumpreliabil-ityandextendedMTBPMareachievedwithexclu-sivefeaturesincluding:•OptionalANSI3A™powerend(Seepage5)•SealSentry™sealchambersfeaturingtheFMLmodelwithflowmodifiersandlargetaperedbore(Seepage11)•Theuniquereversevaneimpeller(Seepage16)•Ultralign™withC-Plusprecisionmotorandpumpshaftalignment(Seepage20)•BaseLinefamilyofpre-engineeredbaseplates(Seepage22)DurcoMarkIIIANSIStandardMKIIITECHBULLETIN-112/5/0211:01AMPage5DanK.SnelsonREDManuals-2:TECHNICALBULLETINS:MKIIITECHP-10-501:5ANSI3A™powerendissoadvanceditcarriesathree-yearMTBPMguarantee.•Certifiedcleanroomassembly•Inpro/Seal’s“VBX”non-contactVaporBlockBearingIsolatorkeepslubricantsinandcontaminantsout•Magneticdrainplugcollectsmetalliccontaminants•TopventreplacedwithplugAChoiceofPowerEndsStandardMarkIIIApowerendsfeature:•Doublerowangularcontactoutboard/singlerow,deepgrooveinboardbear-ingsforexcellentaxialandradialloadsupport•Doublelipoilseals•Topmountedventandoilfiller•Tricooiler•Largeoneinch(25mm)diameterreflectivesightglass•Micrometeradjust-ment(Seepage8)•OptionaloilslingerLubricationoptions:•Syntheticlubricantscanallowuptothreeyearsbetweenoilchanges•Oilmistsystems•Shieldedandgreaselubricatedbearings(two-yearMTBPMguarantee)Note:Adherencetoproperinstallation,operationandmain-tenanceprogramisnecessaryforthree-yearMTBPMguarantee.Optionalswing-awaybearinghousingfootOptionalfinnedoilcoolerAllDurcopowerendsfeature:•Metal-to-metalcon-structiontoassureatruerunningandconcentricshaft,therebyextendingbearingandmechan-icalseallife•DuctileironframeadaptermeetingASMEB.73.1criteriaANSIPUMP&ENHANCEMENTSDurcoMarkIIIANSIStandardPowerEndsMKIIITECHBULLETIN-112/5/0211:01AMPage6DanK.SnelsonREDManuals-2:TECHNICALBULLETINS:MKIIITECHP-10-501:6Durcoshaftsandsleevesaredesignedtoimprovepumpreliability.SHAFTMATERIALCHOICESStandard:investmentcastorhighalloybarstockavailableinawiderangeofmaterials,in-cludingproprietaryDC8andSD77wetends.DC8andSD77offersuperiorcorrosionresis-tanceandhardnesstominimizeshaftfretcorro-sionandmaximizeshaftwetendperformance.•DC8–acobaltbasealloywithchromiumandmolybdenum•SD77–orSuperchlor®isahighsiliconironalloyFlowserverecommendstheuseofsolidshaftsratherthanshaftsleevestoreducetheharmfuleffectsofdeflectionandvibration.Shaftsleevesmaysimplifymaintenancebutsolidshaftsreduceit.➅Run-outof0.001in(0.03mm)atmechanicalsealallowssealfacestoruntrue.➆Criticalsurfacesgroundtoasur-facefinishof16µin(0.4micron)ensurethesecondarysealingabilityofmechanicalseals.➇Steelpowerendsh