Fike DuraQuench User manual
SOLUTIONS
FireProtection
ExplosionProtection
OverpressureProtection
PressureActivation
DESIGN,INSTALLATION,OPERATIONAND
MAINTENANCEMANUAL
DuraQuench™
WETPIPESYSTEMWITHOH‐VSONOZZLESFORPROTECTIONOF
NON‐STORAGEOCCUPANCIES,HAZARDCATEGORY1(HC‐1)
P/N06‐791‐4
Rev.4
COPYRIGHTINFORMATION
©Copyright2015,FikeCorporation.Allrightsreserved.PrintedintheU.S.A.
Thisdocumentmaynotbereproduced,inwholeorinpart,byanymeanswithoutthepriorwrittenconsentofFike.All
Fikedocumentationandhardwarearecopyrightedwithallrightsreserved.
TRADEMARKS
Fike,DuraQuench™,Cheetah®,CyberCat®areregisteredtrademarksofFike.Allothertrademarks,tradenamesor
companynamesreferencedhereinarethepropertyoftheirrespectiveowners.
ERRORSANDOMMISSIONS
Whileeveryprecautionhasbeentakenduringthepreparationofthisdocumenttoensuretheaccuracyofitscontent,
Fikeassumesnoresponsibilitywhatsoeverforerrorsoromissions.
Fikereservestherighttochangeproductdesignsorspecificationswithoutobligationandwithoutfurthernoticein
accordancewithourpolicyofcontinuingproductandsystemimprovement.
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regardingFikeproducts,pleasecallFike’sCustomerSupportDepartmentat(800)‐979‐FIKE(3453),option21.
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BecauseofthemanyandvariedcircumstancesandextremeconditionunderwhichFike’sproductsareused,and
becauseFikehasnocontroloverthisactualuse,Fikemakesnowarrantiesbasedonthecontentsofthisdocument.FIKE
MAKESNOIMPLIEDWARRANTIESOFMERCHANTABILITYORFITNESSFORASPECIFICPURPOSE.Referto
www.fike.com/terms‐conditionsforFike’sfullTERMSANDCONDITIONSOFSALE.
TERMSOFUSE
Donotalter,modify,copy,orotherwisemisappropriateanyFikeproduct,whetherinwholeorinpart.Fikeassumesno
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damagesorlossesincurredbyyouorthirdpartiesarisingfromtheuseofanyFikeproductforwhichtheproductisnot
intendedbyFike.
YoushouldinstallandusetheFikeproductsdescribedinthisdocumentwithintherangespecifiedbyFike,especially
withrespecttotheproductapplication,maximumratings,operatingsupplyvoltagerange,installationandother
productcharacteristics.FikeshallhavenoliabilityformalfunctionsordamagesarisingoutoftheuseofFikeproducts
beyondsuchspecifiedranges.
YoushouldinstallandusetheFikeproductsdescribedinthisdocumentincompliancewithallapplicablelaws,
standards,andregulations.Fikeassumesnoliabilityfordamagesorlossesoccurringasaresultofyournoncompliance
withapplicablelawsandregulations.
ItistheresponsibilityofthebuyerordistributorofFikeproducts,whodistributes,disposesof,orotherwiseplacesthe
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products.
QUALITYNOTICE
FikehasmaintainedISO9001certificationsince1996.Priortoshipment,wethoroughlytestourproductsandreview
ourdocumentationtoassurethehighestqualityinallrespects.
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REVISIONHISTORY
ORIGINALRELEASEDATE:.................................................................................................................................December,2015
REVISION/DESCRIPTIONOFCHANGEREVISIONDATE
REV.1ADDED50HZPUMPSTOFMAPPROVALDECEMBER,2015
REV.2REMOVEDELECTRICALINFORMATIONFROMPRESSUREREDUCINGVALVESPECIFICATIONONPAGE
32.
MAY,2016
REV.3REVISEDPUMPSKIDCONFIGURATIONTOREFLECTRELIEFVALVECHANGETOSINGERVALVE,
ADDEDVARIABLEFREQUENCYDRIVECONTROLLEROPTION,REORGANIZEDSECTIONS4THROUGH9.
MAY,2017
REV.4REVISEDPUMPSKIDCONFIGURATIONTOREFLECTADDITIONOFCIRCULATIONRELIEFVALVEAND
UPDATEDPUMPSKIDORDERINGINFORMATION
FEBRUARY,2020
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TABLE
OF
CONTENTS
1.INTRODUCTION..........................................................................................................................................................1
1.1.General..............................................................................................................................................................1
1.2.SystemDescription............................................................................................................................................1
StraightWetPipeSystem..........................................................................................................................1
1.2.1.1StraightWetPipeSystemusingCPVCPipe...........................................................................................3
1.2.1.2.WhenShouldaPressureMaintenancePumpbeUsed?.......................................................................4
WetPipeSystemwithaPressureMaintenancePump.............................................................................4
1.3.WaterMistPrinciple..........................................................................................................................................7
1.4.WaterMistVersusTraditionalSprinklerSystem...............................................................................................7
1.5.Approvals...........................................................................................................................................................8
1.6.ApplicableStandards.........................................................................................................................................8
2.EQUIPMENT................................................................................................................................................................9
2.1.SourcingSystemComponents...........................................................................................................................9
2.2.OH‐VSONozzle
...................................................................................................................................................9
2.3.OH‐TrimRing....................................................................................................................................................12
2.4.SpannerWrench..............................................................................................................................................12
2.5.PumpSkid........................................................................................................................................................13
2.6.WetAlarmCheckValve(WAC)........................................................................................................................21
2.7.CheckValve......................................................................................................................................................23
2.8.ControlValves..................................................................................................................................................25
2.9.BackflowPreventer..........................................................................................................................................27
2.10.WaterflowAlarmSwitch..................................................................................................................................29
2.11.WaterflowBell.................................................................................................................................................30
2.12.FireDepartmentConnection...........................................................................................................................31
2.13.PressureReliefValve.......................................................................................................................................32
2.14.PressureReducingValve..................................................................................................................................33
2.15.IdentificationSigns...........................................................................................................................................34
2.16.TestConnection...............................................................................................................................................35
2.17.TestHeaderFlowMeter..................................................................................................................................36
2.18.PipingNetwork................................................................................................................................................37
PipeorTube............................................................................................................................................37
Fittings.....................................................................................................................................................37
GalvanicCorrosion..................................................................................................................................37
3.DESIGN......................................................................................................................................................................38
3.1.DesignDocumentation....................................................................................................................................38
3.2.ElectricalClearances........................................................................................................................................39
3.3.AlarmCheckValve...........................................................................................................................................39
3.4.PumpSkidTestHeader....................................................................................................................................39
3.5.FireDepartmentConnection...........................................................................................................................39
3.6.CheckValvesandBackflowPreventers...........................................................................................................39
3.7.PressureMaintenance(Jockey)PumpConnection.........................................................................................40
3.8.SystemActivationandAlarms.........................................................................................................................40
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DetectorRequirements..........................................................................................................................40
RemoteManualActivation.....................................................................................................................40
3.9.ProtectedEnclosure........................................................................................................................................41
3.10.PumpRoom.....................................................................................................................................................41
3.11.WaterSupply...................................................................................................................................................41
WaterSupplySource..............................................................................................................................41
WaterQuality.........................................................................................................................................42
WaterSupplyCapacity...........................................................................................................................42
3.12.DesignProcess................................................................................................................................................43
DetermineNozzleLayout.......................................................................................................................43
3.12.1.1.DetermineNozzleQuantity................................................................................................................43
3.12.1.2.DetermineNozzleSpacing..................................................................................................................43
3.12.1.3.NozzleObstructions...........................................................................................................................44
DetermineNozzleFlowRate..................................................................................................................44
DetermineSystemFlowRate.................................................................................................................44
DetermineSizeofFirePumpRequired..................................................................................................45
3.12.4.1.AmbientTemperatureandAltitude...................................................................................................46
DetermineDistributionPipingLayout....................................................................................................46
HydraulicCalculations............................................................................................................................46
4.INSTALLATION..........................................................................................................................................................47
4.1.PumpSkid........................................................................................................................................................47
SitePreparation......................................................................................................................................47
Inspection...............................................................................................................................................47
Handling.................................................................................................................................................47
Mounting................................................................................................................................................48
PumpSkidDimensions...........................................................................................................................49
PowerSupplyConnectiontoPumpController.......................................................................................50
4.1.6.1.PowerSupplyReliability.....................................................................................................................50
4.1.6.2.PowerSupplyCapacity.......................................................................................................................50
DetectionandReleasingPanelConnectionstoPumpController..........................................................50
PipeConnections....................................................................................................................................51
4.1.8.1.CirculationReliefValveConnection...................................................................................................52
4.1.8.2.WaterSupplyConnection..................................................................................................................52
4.1.8.3.TestHeaderConnection.....................................................................................................................53
4.1.8.4.FireDepartmentConnection..............................................................................................................54
4.1.8.5.PressureMaintenance(Jockey)PumpConnection............................................................................56
4.2.SystemPipingandComponents......................................................................................................................58
ElectricalPotentials................................................................................................................................58
PipeJoints...............................................................................................................................................58
PipeSupports.........................................................................................................................................58
FrostProtection......................................................................................................................................59
4.3.WetAlarmControlValve................................................................................................................................59
4.4.AutomaticBypassValve..................................................................................................................................59
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4.5.Nozzles.............................................................................................................................................................59
4.6.Signage.............................................................................................................................................................60
5.SYSTEMACCEPTANCEANDCOMMISSIONING.........................................................................................................61
5.1.CommissioningRequirements.........................................................................................................................61
6.OPERATION...............................................................................................................................................................62
6.1.WetPipeSystemwithanAlarmCheckValve..................................................................................................62
6.2.WetPipeSystemwithMaintainedExcessPressure........................................................................................62
7.INSPECTIONANDTESTING........................................................................................................................................63
7.1.Nozzles.............................................................................................................................................................63
PeriodicNozzleTesting...........................................................................................................................63
Spares......................................................................................................................................................63
8.MAINTENANCE.........................................................................................................................................................64
8.1.MaintenanceofSurroundingAreas.................................................................................................................64
9.SYSTEMRESTORATIONAFTEROPERATION..............................................................................................................64
9.1.RestoringtheSystem.......................................................................................................................................65
ANNEXA–AUTOMATICPRESSURERELIEFVALVEADJUSTMENTS..................................................................................66
ANNEXB–BASKETSTRAINERCLEANINGPROCEDURE....................................................................................................67
ANNEXC–OH‐VSONOZZLEOBSTRUCTIONS...................................................................................................................68
ANNEXD–PUMPINFORMATION....................................................................................................................................72
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LISTOFFIGURES
FigurePageNo.
Figure1:WetPipeSystem..................................................................................................................................................2
Figure2:WetPipeSystemusingCPVCPipe.......................................................................................................................3
Figure3:WetPipeSystemwithPressureMaintenancePumpmountedontheSkid........................................................5
Figure4:WetPipeSystemwithPressureMaintenancePumpmountedofftheSkid.......................................................6
Figure5:OH‐VSONozzle....................................................................................................................................................9
Figure6:OH‐VSOTypicalNozzleDimensions...................................................................................................................11
Figure7:OH‐VSONozzleSprayPattern............................................................................................................................11
Figure8:OH‐TrimRing.....................................................................................................................................................12
Figure9:OH‐TrimRingDimensions..................................................................................................................................12
Figure10:SpannerWrench..............................................................................................................................................12
Figure11:DuraQuenchPumpSkid...................................................................................................................................13
Figure12:TypicalPumpSkidConfiguration.....................................................................................................................13
Figure13:PumpSkidConfigurationwithFactoryInstalledJockeyPump........................................................................14
Figure14:WACValve.......................................................................................................................................................21
Figure15:02‐14875‐2(1½”/DN40)WACValve............................................................................................................22
Figure16:02‐14875‐1(2”/DN50)WACValve................................................................................................................22
Figure17:CheckValve......................................................................................................................................................23
Figure18:CheckValveDimensions..................................................................................................................................24
Figure19:FPPI2”&21/2”ControlValvesGroovedandThreaded.................................................................................25
Figure20:NIBCO3”ControlValveWaferStyle................................................................................................................25
Figure21:FPPI2”&21/2”GroovedControlValve.........................................................................................................26
Figure22:FPPI2”&21/2”ThreadedControlValve........................................................................................................26
Figure23:NIBCO3”WaferStyleControlValve................................................................................................................26
Figure24:BackflowPreventer..........................................................................................................................................27
Figure25:BackflowPreventerFlowPerformanceChart..................................................................................................28
Figure26:BackflowPreventerDimensions......................................................................................................................28
Figure27:PressureSwitch................................................................................................................................................29
Figure28:WaterflowBell.................................................................................................................................................30
Figure29:FDC...................................................................................................................................................................31
Figure30:Cap...................................................................................................................................................................31
Figure31:FDCDimensions...............................................................................................................................................31
Figure32:ReliefValve......................................................................................................................................................32
Figure33:ReliefValveDimensions..................................................................................................................................32
Figure34:PressureReducingValve..................................................................................................................................33
Figure35:PressureReducingValveDimensions..............................................................................................................33
Figure36:SystemSigns....................................................................................................................................................34
Figure37:TestConnection...............................................................................................................................................35
Figure38:TestConnectionDimensions...........................................................................................................................35
Figure39:FlowMeter......................................................................................................................................................36
Figure40:Relationshipbetweenmotoroutput(P2)andambienttemperature/altitude...............................................46
Figure41:PumpSkidLiftingandMountingPoints...........................................................................................................48
Figure42:PumpSkidwithCastersInstalled.....................................................................................................................48
Figure43:PumpSkidDimensions(shownwithoptionaljockeypump)...........................................................................49
Figure44:2”(DN50)PumpSkidWaterSupplyConnection.............................................................................................52
Figure45:3”(DN80)PumpSkidWaterSupplyConnection.............................................................................................52
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Figure46:TestHeaderConnection...................................................................................................................................53
Figure47:FireDepartmentConnectionforSystemDesignPressure<=175psi(12bar)................................................54
Figure48:FireDepartmentConnectionforSystemDesignPressure>175psi(12bar)...................................................55
Figure49:WetPipeSystemwithPressureMaintenancePumpmountedontheSkid....................................................56
Figure50:WetPipeSystemwithPressureMaintenancePumpmountedofftheSkid....................................................57
Figure50:PressureReliefValveSchematic.........................................................................................................................1
Figure51:OH‐VSOTypicalNozzleMounting....................................................................................................................60
Figure52:SpannerWrench...............................................................................................................................................60
Figure53:PressureReliefValveSchematic.......................................................................................................................66
Figure54:BasketStrainer.................................................................................................................................................67
Figure55:OH‐VSONozzleSprayPattern..........................................................................................................................68
Figure56:ObstructionsofSinglePendentNozzles...........................................................................................................69
Figure57:ObstructionsofMultiplePendentNozzles.......................................................................................................69
Figure58:MotorNameplate.............................................................................................................................................72
Figure59:FirePumpVentPlug.........................................................................................................................................73
Figure60:FirePumpCouplingGuard...............................................................................................................................74
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1. INTRODUCTION
1.1. General
DuraQuenchisanFMApprovedsinglefluidwatermistsystemfortheprotectionofnon‐storageoccupancies,Hazard
Category1(HC‐1).TheprimarycomponentsoftheDuraQuenchWetPipesystemconsistsofafirepumpskid,patented
OH‐VSOfinewaterspraynozzles,ancillaryFMApprovedcomponents(i.e.,controlvalves,backflowpreventers,isolation
valves,etc.),andareliablewatersource(i.e.,publicmains,gravitytanksorothersuitablewatersources).These
componentsareconnectedtogetherasasystemtodeliverwatermisttotheprotectedenclosuretocontrol,suppress,
orextinguishfires.Withaminimumoperatingpressureof116psi(8bar)andamaximumoperatingpressureof232psi
(16bar)atthesystemnozzles,thesystemisclassifiedbyNFPA750,StandardonWaterMistFireProtectionSystemsas
anintermediatepressuresystem.
1.2. SystemDescription
WhenconfiguredasaWetPipeSystem,DuraQuenchisafixedprotectionsysteminwhichthepipesystemisfilledwith
pressurizedwateruptothenozzlesduringnormalstandbyoperation.Asystemcheckvalveservestomaintainsystem
pressuresinthepipingnetwork.Wetpipesystemsmaybeinstalledinanystructurethatisreliablymaintainedabove
40°F(4°C).Closed,heat‐sensitive,automaticnozzleslocatedandspacedthroughouttheprotectedareasareusedto
detectafire.Optionalsmokedetectorscanbeinstalledintheprotectedareatoprovideadvancednotificationofafire
event.
Uponactivationofanozzleduetoheatfromthefire,waterwillbegintoflowimmediatelyfromtheopennozzleand
willcauseadropinsystempressure.Dependinguponthesystemconfiguration,eithertheflowofwaterorthepressure
dropinitiatesactivationofthefirepump.Activationofthepumpwillcauseanincreaseinboththeflowandpressure
ofthewatersupplytotheopennozzles.Asthepressurizedwaterstreamdischargesthroughthesmallorificesinthe
nozzle,itcreatesahomogenoussprayofwaterdroplets.Theresultingmixtureofsmallandlargewaterdroplets
(minimum90%ofdroplets<300µm)generatedbythenozzlesworkintandemtoprovideactivefireprotectionas
describedinSection1.3.
TherearetwosystemconfigurationoptionsfortheDuraQuenchwetpipesystem:1)Straightwetpipesystem,and;2)
Wetpipesystemwithapressuremaintenance(jockey)pump.Abriefdescriptionofeachsystemconfigurationis
providedasfollows.
StraightWetPipeSystem
Thissystemconfiguration(seeFigure1)utilizesaFikeWetAlarmCheck(WAC)valveinconjunctionwithavane(paddle)
typewaterflowswitchtomonitorandactivatetheDuraQuenchsystem.TheWACisacheckvalvewithabuilt‐inwater
flowsensorandpressuregauges(supplyandsystem).Undernormalconditions,theclapperoftheWACvalveisclosed
helpingtomaintainthepressureinthepipingnetworkdownstreamofthevalve.TheWACvalvealsopreventsthewater
containedwithinthepipingnetworkfromflowingbackintothecitysupply.
UponthermalactivationofanOH‐VSOnozzleduetoafire,waterwillbegintoflowthroughthepipingnetworkandout
throughanyopennozzle(s).Thecontinuousflowofwater(9.25±0.79gpm/35±3lpmminimum)causesactivationof
theWACvalve’sintegratedwaterflowsensorinitiatingasignaltothedetectionandreleasingpanelcausingactivation
ofthesystem’swaterflowalarmbell.Atthesametime,theflowofwater(10gpm/38lpmminimum)throughthepiping
networkactivatesthepaddletypewaterflowswitchinstalledonthesystempipingdownstreamoftheWACvalve
initiatingasignaltothedetectionandreleasingpaneltotriggerthepumpcontrollertostartthefirepump(openingof
relaycontacts)sendingpressurizedwaterthroughthepipingnetworkwhereitisreleasedthroughanyopennozzles.
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BoththeWACvalve’swaterflowsensorandthewaterflowswitchhaveanadjustabletimedelaythatinhibitsthe
initiationofawaterflowsignalinordertoreducethepossibilityoffalsealarmsandfalseactivationofthepumpthat
canbecausedbypressuredropsorfluctuationsinthewatersupply.
Figure1showsthetypicalcomponentsandarrangementsthatmakeupaDuraQuenchWetPipesystemwithanAlarm
CheckValve.
Figure1:WetPipeSystem
1.Suctionisolationvalve(monitored)16.Riserstopvalve(monitored)
2.Suctionflange17.WetAlarmCheckvalve(WAC)
3.Suctionbasketstrainer17a.Drainvalve(partofWACvalve)
4.Suctionpressuregauge17b.Waterflowswitch(partofWACvalve)
5.Circulationreliefvalve(opensat275psi/19bar)17c.Inletpressuregauge(partofWACvalve)
6.Centrifugalpumpandmotor17d.Outletpressuregauge(partofWACvalve)
7.Testheaderisolationvalve(monitored)18.Waterflowswitch(pumpactivation)
8.Testheaderflange19.Riserstopvalve(monitored)
9.Pressurereliefvalve(opensat245psi/16.9bar)20.OH‐VSOwatermistnozzles(closedhead)
10.Firepumpcontroller21.Remotetestvalve(monitored)1
11.Pumpcontrollertomotorelectricalconnection22.FireAlarmcontrolpanel
12.Dischargepressuregauge23.Waterflowalarmbell(electric)
13.Dischargeisolationvalve(monitored)24.MonitorModule‐Pumpcontrollermonitoring
14.Dischargeflange25.RelayModule‐Pumpcontrolleractivation
15.CheckValve26.MonitorModule–devicemonitoring
1Locateatmostremotenozzleonthesystem.Usedtoverifysystemactivationviawaterflowswitch(items17band18).
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StraightWetPipeSystemusingCPVCPipe
Byaddingapressurereducingvalve(PRV)tothedistributionpiping(seeFigure2)toregulatetheoperatingpressure
suppliedtothepipingdownstreamofthevalvetoamaximumof175psi(12bar),thedistributionpipingdownstream
ofthePRVcanbeinstalledusingCPVCpipe.ApressurereliefvalvemustbeinstalleddownstreamofthePRVtoprovide
failsafepressurereliefshouldthePRVfail.
Figure2:WetPipeSystemusingCPVCPipe
1.Suctionisolationvalve(monitored)17.WetAlarmCheckvalve(WAC)
2.Suctionflange17a.Drainvalve(partofWACvalve)
3.Suctionbasketstrainer17b.Waterflowswitch(partofWACvalve)
4.Suctionpressuregauge17c.Inletpressuregauge(partofWACvalve)
5.Circulationreliefvalve(opensat275psi/19bar)17d.Outletpressuregauge(partofWACvalve)
6.Centrifugalpumpandmotor18.Waterflowswitch(pumpactivation)
7.Testheaderisolationvalve(monitored)19.Riserstopvalve(monitored)
8.Testheaderflange20.Pressurereducingvalve(PRV)
9.Pressurereliefvalve(opensat245psi/16.9bar)21.Pressurereliefvalve
10.Firepumpcontroller22.OH‐VSOwatermistnozzles(closedhead)
11.Pumpcontrollertomotorelectricalconnection23.Remotetestvalve(monitored)
1
12.Dischargepressuregauge24.FireAlarmcontrolpanel
13.Dischargeisolationvalve(monitored)25.Waterflowalarmbell(electric)
14.Dischargeflange26.MonitorModule‐Pumpcontrollermonitoring
15.CheckValve27.RelayModule‐Pumpcontrolleractivation
16.Riserstopvalve(monitored)28.MonitorModule–devicemonitoring
1
Locateatmostremotenozzleonthesystem.Usedtoverifysystemactivationviawaterflowswitch(items17band18).
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WhenShouldaPressureMaintenancePumpbeUsed?
WiththesystemconfigurationsshowninSections1.2.1and1.2.1.1,itisvitalthatthewatersupplytothesystem(see
Section3.11forwatersupplyrequirements)berelativelyfreefrompressurefluctuationsandthepipenetworkbe
designedtoprovidethewaterflowrequiredtotriptheflowswitchesusedforpumpactivationandalarmnotification,
basedontheactivationofasingleOH‐VSOnozzle.Hydrauliccalculationsmustbeperformedonthepipenetworkprior
toinstallationtoconfirmthatthewatersupplyiscapableofprovidingthepressurerequiredtoobtainthewaterflows
requiredforpumpactivation.Inaddition,theinstalledsystemmustbefunctionallytestedusingtheremotetestvalve
andanOH‐VSOorificetestfittingtoverifypumpactivationbasedontheactivationofasinglenozzle.Ifthewatersupply
isNOTcapableofprovidingsufficientflowandpressureforpumpactivation,apressuremaintenancepumpsystem,as
detailedinSection1.2.2,mustbeinstalled.
WetPipeSystemwithaPressureMaintenancePump
NOTE‐DuraQuenchsystemsconfiguredwithapressuremaintenancepumparenotwithinthescopeofthesystem’s
FMApproval.
Thissystemconfiguration(seeFigures3and4)incorporatesapressuremaintenance(jockey)pumpintothe
DuraQuenchsystem.Thejockeypumpcanbemounteddirectlyontothepumpskidorfieldinstalledoffthepumpskid.
Thejockeypumpinstallationwillincludeaseparatejockeypumpcontrolleranditsownindependentpressuresensing
lineconnection.
Thepurposeofthejockeypumpistwo‐fold.Thefirstpurposeistomaintainahigherpressureonthesystemsideofthe
FikeWetAlarmCheckValve(WAC)thanthestandardwatersupplycanreach.Thehigherpressureholdstheclapperof
theWACvalveandWaterFlowswitchclosedevenwhenthewatersupplypressurefluctuates.Thiseliminatesfalse
alarmscausedbypressuresurgesinthewatersupply.Thesecondpurposeofthejockeypumpistomaintainastatic
pressureinthepipingnetworktopreventshortcyclingofthefirepumpcausedbyminorpressurelossesinthepiping
networkduetoleakyfittingsandchangesinthesystemtemperatures.Thesepressurelossescancauseactivationofthe
firepumpundernon‐fireconditions.
Thejockeypumpisahigh‐pressure,low‐flowpumpsizedsothatitcan
compensateforsmallpressurefluctuationsin
thesystempipingreturningthesystemtoitsnormalstaticpressurerangeundernon‐fireconditions.However,the
jockeypumpcannotsustainthesystempressureaftertheactivationofasinglenozzle.Ingeneral,thejockeypumpis
sizedsothatitsflowislowerthanthatexpectedfromthesmallestorificenozzleonthesystem.Therefore,whena
nozzleopens,thejockeypumpoperatesbutcannotmaintainadequatesystempressureduetotherelativelyhigh
volumeofwaterflowfromanoperatingnozzleascomparedtothatofaleakyfitting.Thepressurewithinthesystem
continuestofalluntilthefirepumpstartsandproducestherequiredflowandpressuretooperatethesystem.
Itisextremelyimportantwiththissystemconfigurationthatthepressuresettingsofboththefirepumpandthejockey
pumpbesetcorrectlytoavoidnon‐emergencystarting(short‐cycling)ofthefirepump,whichcanshortenitslifespan.
Thepressuresettingofthejockeypumpshouldbesetsothatitstartsbeforethemainfirepumpmaintainingaminimum
staticpressureinthepipingnetwork.
NOTE‐Jockeypumpsdonotrequirealistingasfireprotectionequipment.Anypumpthatcanproducethenecessary
pressureisacceptable.Althoughjockeypumpsandtheircontrollersdonotrequirealisting,NFPA20includesa
numberofrequirementsaddressingtheirinstallation.Asnotedabove,confirmthatthejockeypumpcontroller
hasapressure‐sensinglineindependentfromthatofthefirepump.
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704SW10thStreet,P.O.Box610,BlueSprings,Missouri64013‐0610U.S.A.●Phone:(816)229‐3405●www.fike.com
Figure3:WetPipeSystemwithPressureMaintenancePumpmountedontheSkid
1.Suctionisolationvalve(monitored)18b.Waterflowswitch(partofWACvalve)
2.Suctionflange18c.Inletpressuregauge(partofWACvalve)
3.Suctionbasketstrainer18d.Outletpressuregauge(partofWACvalve)
4.Suctionpressuregauge19.Riserstopvalve(monitored)
5.Circulationreliefvalve(opensat275psi/19bar)20.OH‐VSOwatermistnozzles(closedhead)
6.Centrifugalpumpandmotor21.Remotetestvalve(monitored)
7.Testheaderisolationvalve(monitored)22.FireAlarmcontrolpanel
8.Testheaderflange23.Waterflowalarmbell(electric)
9.Pressurereliefvalve(opensat245psi/16.9bar)24.MonitorModule‐Pumpcontrollermonitoring
10.Firepumpcontroller25.MonitorModule–devicemonitoring
11.Pumpcontrollertomotorelectricalconnection26.Jockeypumpisolationvalve
12.Firepumppressuresensingline27.Jockeypumpandmotor
13.Dischargepressuregauge28.Checkvalve
14.Dischargeisolationvalve(monitored)29.Jockeypumplinedischargeflange
15.Dischargeflange30.Jockeypumpisolationvalve
16.CheckValve31.Jockeypumpcontroller
17.Riserstopvalve(monitored)32.Jockeypumppressuresensingline
18.WetAlarmCheckvalve(WAC)33.Electricalconnection–jockeypumpmotortocontroller
18a.Drainvalve(partofWACvalve)
Page6P/N06‐791‐4(Rev.4)
704SW10thStreet,P.O.Box610,BlueSprings,Missouri64013‐0610U.S.A.●Phone:(816)229‐3405●www.fike.com
Figure4:WetPipeSystemwithPressureMaintenancePumpmountedofftheSkid
1.Suctionisolationvalve(monitored)18b.Waterflowswitch(partofWACvalve)
2.Suctionflange18c.Inletpressuregauge(partofWACvalve)
3.Suctionbasketstrainer18d.Outletpressuregauge(partofWACvalve)
4.Suctionpressuregauge19.Riserstopvalve(monitored)
5.Circulationreliefvalve(opensat275psi/19bar)20.OH‐VSOwatermistnozzles(closedhead)
6.Centrifugalpumpandmotor21.Remotetestvalve(monitored)
7.Testheaderisolationvalve(monitored)22.FireAlarmcontrolpanel
8.Testheaderflange23.Waterflowalarmbell(electric)
9.Pressurereliefvalve(opensat245psi/16.9bar)24.MonitorModule‐Pumpcontrollermonitoring
10.Firepumpcontroller25.MonitorModule–devicemonitoring
11.Pumpcontrollertomotorelectricalconnection26.Jockeypumpisolationvalve
12.Firepumppressuresensingline27.Jockeypumpandmotor
13.Dischargepressuregauge28.Checkvalve
14.Dischargeisolationvalve(monitored)29.Jockeypumpisolationvalve
15.Dischargeflange30.Jockeypumpcontroller
16.CheckValve31.Jockeypumppressuresensingline
17.Riserstopvalve(monitored)32.Electricalconnection–jockeypumpmotortocontroller
18.WetAlarmCheckvalve(WAC)
18a.Drainvalve(partofWACvalve)
P/N06‐791‐4(Rev.4)Page7
704SW10thStreet,P.O.Box610,BlueSprings,Missouri64013‐0610U.S.A.●Phone:(816)229‐3405●www.fike.com
1.3. WaterMistPrinciple
Forafiretosurvive,itreliesonthepresenceofthreeelementsofthe‘fire
triangle:oxygen,heatandcombustiblematerial.Theremovalofanyoneof
theseelementswillextinguishafire.Watermistutilizesthreeprimary
mechanismsthatacttogethertoextinguishafire:
1)HeatExtraction
2)OxygenDisplacement
3)BlockingofRadiantHeat
HeatExtraction(cooling)
Aswatermistisappliedtoafireitabsorbsheatfromthehotgasesandflames,fromthefuel,andfromobjectsand
surfacesinthevicinityofthefireasthedropletsareconvertedtosteam.ThefinewaterspraygeneratedbytheK6
nozzle(Dv99<300µm)increasesthespeedatwhichheatisextractedfromthehotgasesandflame.Ifsufficientheatis
removed,thetemperatureoftheflamecanbedroppedbelowthatwhichisnecessarytosustaincombustion.Cooling
ofthefuelandobjectswithintheenclosurealsohelpstoreducethespreadofthefire.
OxygenDisplacement
Aswatermistisreleasedintotheprotectedenclosureitinteractswiththeflamesandhotgasesgeneratedbythefire
andisquicklyconvertedtosteam.Asthewatersprayisconvertedtosteam,itexpandsapproximately1,700times
forcingoxygenawayfromthevicinityofthedroplet.Thisresultsindilutionoftheair(oxygen)supplywithinthe
protectedenclosure.Iftheamountofoxygennecessarytosupportcombustionisreducedbelowacriticallevel(14%–
13%),theenergyoutputoftheoxidationprocessfailstobecomeclosetotheenergyinputthefirerequirestosustain
thechemicalfireprocesswhichwillcausethefiretoburninefficientlymakingiteasiertoextinguish.
BlockingofRadiantHeat
Aswatermistisreleasedintotheprotectedenclosure,thefinewaterdropletsblocktheradiantheatgeneratedbythe
firefromgettingtounignitedfuelsurfacesandreducestheradiantheatfluxbetweentheflameandthefuelsurface.
1.4. WaterMistVersusTraditionalSprinklerSystem
Watermisthasseveraladvantagesoverconventionalsprinklersystems.OneofthekeybenefitsoftheDuraQuench
systemisthatittypicallyuses75%lesswaterthanasprinklersystem.Withawatermistsystem,themajorityofthe
waterdropletsareevaporatedbytheheatandhotgasesgeneratedbythefireresultinginmuchlesswaterdamageto
theprotectedpropertyandadramaticreductionindowntimeforcleanup.Inlighthazardapplications,thereduced
downtimemeansthatthefacilitywillbeabletoresumenormaloperationsveryquicklyafterafireevent.
Incontrast,traditionalsprinklersystemsspreadlargewaterdropletsovertheprotectedenclosuretoabsorbheatand
cooltheroom.Duetothelargesizeandrelativelysmallsurfaceareaofsprinklerwaterdroplets,theywillnotabsorb
enoughenergytoevaporateandquicklyfalltotheflooraswater.Thisresultsinlimitedcoolingofthefireandgreater
waterdamagetotheprotectedpropertycausingalargeincreaseinfacilitydowntimeduetothefireevent.
Page8P/N06‐791‐4(Rev.4)
704SW10thStreet,P.O.Box610,BlueSprings,Missouri64013‐0610U.S.A.●Phone:(816)229‐3405●www.fike.com
1.5. Approvals
TheDuraQuenchwetpipewatermistsystemisFMApprovedtoFM5560AppendixGfortheprotectionofnon‐storage
occupancies,HazardCategory1(HC‐1).
Applicationsincludebutarenotlimitedtothefollowing:
ApartmentsMeetingroomsinconventioncentersandhotels
AtriumsMetalworkingshopswithnon‐hydrauliccuttingoperations
ChurchesMineralprocessing(i.e.:glass,cement,oretreating,gypsumprocessing,etc.)
ConcealedSpacesMuseums
GymnasiumsNursingorconvalescenthomes
HospitalsOffices
HotelroomsRestaurantseatingareas
InstitutionsSchoolsanduniversityclassrooms
KitchensUnusedattics
Libraries
Exceptionsincludethefollowing:
Electronicandplasticmediastoragesfacilities.
Hospitallaboratorieswithstorageandprocessingofflammableliquids.
Facilitieswithoperationinvolvinghydraulicfluidorflammableliquids.
Librarystackroomswithstructureshigherthan8feet(2.4m)andaislesnowiderthan30inches(0.76m).
Forapplicationsnotlistedabove,contactFikeProductSupport(1‐816‐229‐3405)forapplicationreviewandapproval.
1.6. ApplicableStandards
Fireprotectionconsultants,systemdesigners,systeminstallers,fireauthorities,systeminspectors,systemmaintenance
engineers,andusersofthesystemshouldrefertothefollowingstandardsandguidelinesforadditionalinformation
regardingtheapplicationofwatermistsystems.
NFPA750,StandardonWaterMistProtectionSystems
NFPA20,StandardfortheInstallationofStationaryPumpsforFireProtection
FMGlobalPropertyLossPreventionDataSheet3‐7,FireProtectionPumps
FMGlobalPropertyLossPreventionDataSheet4‐2,WaterMistSystems
FMGlobalPropertyLossPreventionDataSheet3‐26,FireProtectionWaterDemandforNon‐storage
SprinkleredProperties.
P/N06‐791‐4(Rev.4)Page9
704SW10
th
Street,P.O.Box610,BlueSprings,Missouri64013‐0610U.S.A.●Phone:(816)229‐3405●www.fike.com
2. EQUIPMENT
TheDuraQuenchwetpipewatermistsystemconsistsofanumberofOH‐VSOnozzlesandwetpipealarmcheckvalve
connectedbyapipingnetworktoacontinuouspressurepumpskidunit,whichisconnectedtoasuitablewatersource
(i.e.,publicmains,gravitytanks,reservoirs,etc.).
ThissectionprovidesadescriptionofthecomponentsthatcanbeusedtoconstructtheDuraQuenchwetpipewater
mistsystem.
2.1. SourcingSystemComponents
TheDuraQuenchpumpskidunitandtheOH‐VSOnozzlesaretheonlytwocomponentsthatmustbepurchasedfrom
FikeinordertomaintainFMApproval.Theremainingsystemcomponentsincludingwetalarmcheckvalve,detection
andcontrolpanel,controlvalves,piping,switches,etc.canbesourcedfromothersuppliers.Theoperatingpressure
requirementoftheDuraQuenchsystemallowstheuseoftraditionalFMApprovedsprinklercomponentsandwetpipe
systemvalves.
ComponentsselectedforuseontheDuraQuenchsystemshallbeFMApprovedforuseinwetpipesprinklersystems.All
systemcomponentsshouldbeapartofanFMApprovalfollowupservice.Itisveryimportanttoverifythatthe
componentsaresuitableforuseintheDuraQuenchsystemregarding:
Componentmaterials
Componentconnections
Corrosionresistance(galvaniccorrosion)
Flowandworkingpressure
Frictionlosses
FMApproval
Allsystemcomponentsshallbeusedinaccordancewiththeirapprovals,andinaccordancewiththemanufacturer’s
guidelines.
Allsystemcomponentsshallbeincludedinthehydraulicsystemdesign.
2.2. OH‐VSONozzle
TheOH‐VSOisanautomaticwatermistnozzlesuitedfortheprotection
ofoffices,schools,hotels,museums,institutions,dataprocessingareas,
concealedspaces,meetingrooms,restaurantseatingareas,andsimilar
applications.
TheOH‐VSOnozzleisinstalledsemi‐recessedintotheceilingwiththe
trimringflushtotheceilingsurface,leavingonlythenozzlecoverplate
exposedbelowtheceiling.Nozzlesandtrimringsareavailablewith
eitherachromeorwhitefinish.
Approvals
TheOH‐VSOnozzlehasbeensuccessfullytestedtotheFM5560standardforFMHC‐1occupancies.Thismeansthatthe
OH‐VSOcanbeusedinmostLightHazardsdefinedinNFPA13and750,andOrdinaryHazard1and2definedinEN
12845.
Figure5:OH‐VSONozzle
Page10P/N06‐791‐4(Rev.4)
704SW10thStreet,P.O.Box610,BlueSprings,Missouri64013‐0610U.S.A.●Phone:(816)229‐3405●www.fike.com
Ordering
02‐14870‐A‐B‐C‐D‐E
A(Material):1=Brass;2=SST
B(Threads):1=½NPT;2=½BSP
C(CoverPlate):1=ChromePlated;2=White(RAL9010)
D(Temperature):1=57°C(135°F)*;2=68°C(154°F);3=79°C(174°F);4=93°C(199°F)
E(DropPipeLength)**
*FMApprovedreleasetemperature.
**Optionaldryunitextensionforuseonwetpipesystemswherepipeconnectionsareexposedtoatemperaturebelow32°F(0°C).
NOTFMApprovedforusewiththeDuraQuenchwetpipesystemprotectingHC‐1hazards.RefertodatasheetW.1.30.01fordetails.
Specifications
General
Weight 0.46lbs.(0.211kg)
HousingMaterialBrass(NiSncoating)
StrainerMaterialStainlessSteel316L
ThreadType½”NPTor½”BSP
CoverPlateFinishChromeorWhite
(otherRALcolorsavailable)
MinimumWaterPressure 116psi(8bar)
MaximumWorkingPressure 232psi(16bar)
K‐factor1.16(gal/min/√psi)
16.7(l/min/√bar)
DropletSize DV90<300μm
FMApprovedNominalReleaseTemperature135°F(57°C)
AmbientInstallationTemperatureRange40°Fto100°F(4°Cto38°C)
Application
MaximumCeilingHeight16’‐5”(5m)
MinimumCeilingHeight6’‐7”(2m)
MaximumSpacing14’‐9”x14’‐9”(7’‐4”towall)
4.5mx4.5m(2.25mtowall)
MinimumSpacing7’‐5”x7’‐5”(3’‐2”towall)
2.25mx2.25m(1.125mtowall)
MinimumDesignArea(NFPA750/FM)Mostremote9nozzlesorallnozzleswithina1500
ft2(140m2)demandarea,whicheverisgreater
MaximumDesignAreaUnrestricted
MinimumSystemOperationTime>30minutes(NFPA750)
>60minutes(FM)
NominalFlowRate12.48gal/min(47.23l/min)
P/N06‐791‐4(Rev.4)Page11
704SW10thStreet,P.O.Box610,BlueSprings,Missouri64013‐0610U.S.A.●Phone:(816)229‐3405●www.fike.com
DimensionalInformation
Figure6:OH‐VSOTypicalNozzleDimensions
OH‐VSONozzleSprayPattern
Figure7:OH‐VSONozzleSprayPattern
Page12P/N06‐791‐4(Rev.4)
704SW10
th
Street,P.O.Box610,BlueSprings,Missouri64013‐0610U.S.A.●Phone:(816)229‐3405●www.fike.com
2.3. OH‐TrimRing
TheOHtrimring(rosette)isdesignedtocovertheholecreatedfortheinstallation
oftheOH‐VSOnozzle(1.7–2.2”/45–55mmØ).TheOHtrimringisfittedtothe
OH‐VSOnozzleafterthenozzleshavebeencorrectlyfittedinthepipesystem.
Specifications
PartNumber
02‐14879‐1(StainlessSteelPlating)
02‐14879‐2(RAL9010)
02‐14879‐3(StainlessSteelPlating,lockscrews)
02‐14879‐4(RAL9010,lockscrews)
Material316StainlessSteel
Weight0.39oz(12g)
FinishRawmaterialorRAL‐9010(otherRALcolorsavailable)
DimensionalInformation
Figure9:OH‐TrimRingDimensions
2.4. SpannerWrench
Thespannerwrenchisdesignedforfast,correctandsafeinstallationoftheOH‐VSOnozzle.Thenozzletobeinstalledis
placedinthespannerandisscrewedintothepipesystem.Thenozzleiscorrectlypositionedwhenthecircularspanner
markisflushtotheceilingsurface.Thespannerrequiresaninstallationholeof17/8”(48mm)Ø.
Figure10:SpannerWrench
Specifications
PartNumber02‐15267
MaterialsDIN2391/C35ChromePlate
Weight17.7oz(550g)
Dimensions8.78”x1.42”(223mmx36mm)
Figure8:OH‐TrimRing
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