Pentair Wellmate Tank Baffle Factor User guide

12/11/2017

PENTAIR

WATERANDITSEFFECTS

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PENTAIR

WATERANDITSEFFECTS

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1

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PENTAIRWATERPURIFICATION

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PENTAIR

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MEETINGTITLE

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WHATISBAFFLEFACTORHOWTODETERMINETHEBAFFLEFACTOR

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EffectivenessoftheDisinfectionProcess

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Disinfectionperformancecanbeimprovedby:

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Increasingtheconcentrationofdisinfectant

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Increasingthedisinfectantcontacttime

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Decreasingtheflowrate

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Increasingthetankvolume

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Increasingthetemperature

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Increasingthebafflingfactor.

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Theonlyperformancefactorthatwecanaffect,by

design,isthebafflefactor.

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BaffleFactor

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Themeasureofafluid’sshort‐circuitinginside

ofatank

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Valuerangesfrom0to1.0

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1.0:Bestforthedisinfectionprocess.

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Tankfluidisfirstin,firstout(plugflow)

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0.#Somedegreeofmixing

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0.0:Perfectshortcircuit.Incomingfluidgoes

directlytotheoutlet,restoftankisadead

zone.

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Chlorine/ChlorideTracerStudy

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Themosteffectivemethodtodetermineasystem’sbafflefactoristoperformachlorine/chloride

tracerstudyonthetank.

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Feedwatertocontainaknownconcentrationofchlorine

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Testtanktocontainchlorine‐freewater

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Thefeedsolutionispumpedintothetank,andthetank’soutletismonitoredforchlorine.

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T(systemtime)=TankCapacity/FlowRate

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10

(T“ten”time)=Timeatwhichthetank’soutputreaches10%ofthefeed

concentration

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Foragivenflowrate,theBaffleFactor=T

10

/T

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ExampleCalculation:

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120gallontank

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Flowrateof3GPM

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T=120gallons/3GPM=40minutes

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PENTAIR

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WATERANDITSEFFECTS

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Measuresoffluidshort‐circuiting

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3

PENTAIR

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ExperimentalResult:Outletconcentrationoftankreaches10%offeedconcentrationatthe12

minutemark(T

10

=12).

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BaffleFactor=12minutes/40minutes=0.30

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Determineexperimentally

WATERANDITSEFFECTS

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ORIGINALUTTANK,NOINTERNALWATERROUTING

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POORBAFFLING

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Channelingandnomixing,yieldingabafflefactorof0.5

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IFcustomerswererunningtanksinseries…bafflefactorwouldbeimproved

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OUT

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Currentdesignwithoutinternalschanneledthroughthewaterflow

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WHATISNEW

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Airreleaseplug

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BaffleKitthat

improvesthe

waterflowand

BaffleFactor

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Inlet/Outlet&BlowdownPort

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WaterinWaterout

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BaffleKitavailableasaconversionkit

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Newdesignimprovesbafflefactorabove.3

WATERANDITSEFFECT

IMPORTANCEOFWELLTANKS

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BAFFLEFACTOR/CONTACTTIME

WATERANDITSEFFECTS–IMPORTANCEOFWELLTANKS,

ANDFILTRATIONSYSTEMSFORTHEHOME

DaveSmith

MikeFlynn

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Pentair Wellmate Tank Baffle Factor User guide

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