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How to choose the correct baghouse filter
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http://www.baghouse.com/2011/02/02/how-to-choose-the-correct-baghouse-filter/
How to Choose the Correct Baghouse Filter
Step 1– FilterMedia Selection:
Choose the mediafromwhich yourfilterbagswill be constructedof basedonthe type of application
theywill be usedfor.Take the followingthingsintoconsiderationpriortoselectingyourfiltermedia:
• Temperature –Do yourbags needto withstandextreme temperatures?
• Material – What is the filterbeingusedfor?
• Chemistry –Can yourfilterwithstandthe chemicalmakeupof the dustparticles
• Resistance- Isthe filtermediaable toresistthe abrasionof the dustparticles
Choosingthe correctfiltermediaisanimportantandsometimesdifficultprocess.Toassistyouin
the identificationof the rightmediaforyourbags,keepthe followinginmind:Filterbag
performance isdirectlyrelatedtohowwell itcantolerate the environmentinwhichitisbeingused.
How efficientlyitcanremove the dustparticlesfromitsfabricand itsabilitytobe cleanedbythe
dustcollectorisalsoimportant.Youmust firstlearnto identifythe type of filtermediacurrently
usedinyour application.Belowyouwillfindalistof typical constructionmethods:
• Wovenfelts
• Non-wovenfelts
• Natural fibers
• Synthetics(ThermosetorThermoplasticssuchasPolypropylene “PPRO” –Polyphenylenesulfide
“PPS” – Polyester“PE”)
For additional informationonmediatypes please examine ourFilterFabricsChartbelow.A simple
testto determine if amaterial isathermoplasticistotake a small swatchand put a flame toit. A
thermoplasticmaterialwillbegintomeltwhenexposedtodirectheat.The selectioncriterion
eliminatesmaterialsbasedontemperature andchemical characteristics.The firstcutisusuallymade
basedon temperature.Thenthe chemical characteristicsof the gasstream are consideredtofurther
refine the search.Next,the efficiencyof the material furtherdictatesthe constructionof the
material suchas the weight,oz/sq.ft.,fiberandsurface treatments/membranes.Lastbutnot least,
if there are still twoormore candidatesitcomesdownto a price versusperformance trade off.
DustCollector FilterFabrics:
Popular Materials
Polyester Felt
Recommendedcontinuousoperationtemperature: 275°F
Maximum(shorttime) operationtemperature: 300°F
Supportscombustion: Yes
Biological resistance (bacteria,mildew): NoEffect
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Resistance toalkalis: Fair
Resistance tomineral acids: Fair+
Resistance toorganicacids: Fair
Resistance tooxidizingagents: Good
Resistance toorganicsolvents: Good
Available weights:10oz. – 22 oz.
PolypropyleneFelt
Recommendedcontinuous operationtemperature: 190°F
Maximum(shorttime) operationtemperature: 210°F
Supportscombustion: Yes
Biological resistance (bacteria,mildew): Excellent
Resistance toalkalis: Excellent
Resistance tomineral acids: Excellent
Resistance toorganicacids: Excellent
Resistance tooxidizingagents: Good
Resistance toorganicsolvents: Excellent
Available weights:12oz. – 18 oz
High Temperature Materials
Conex® /Nomex® Felt(Aramid)
Recommendedcontinuousoperation temperature:400°F
Maximum(shorttime) operationtemperature: 425°F
Supportscombustion: No
Biological resistance (bacteria,mildew): NoEffect
Resistance toalkalis: Good
Resistance tomineral acids: Fair
Resistance toorganicacids: Fair+
Resistance to oxidizingagents: Poor
Resistance toorganicsolvents: Good
Available weights:10oz. – 22 oz.
Polypropylene Felt
Conex® / Nomex® Felt (Aramid)
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Resistance toorganicsolvents: Good+
Available weights:15oz. – 18 oz.
EpitropicFeltAntistatic
Recommendedcontinuousoperationtemperature: 275°F
Maximum(shorttime) operationtemperature: 300°F
Supportscombustion: Yes
Biological resistance (bacteria,mildew): NoEffect
Resistance toalkalis: Fair
Resistance tomineral acids: Fair+
Resistance toorganicacids: Fair
Resistance tooxidizingagents: Good
Resistance toorganicsolvents: Good
Available weights:14oz. – 16 oz.
Step 2– Dust Collector Filter Measurements:
Accurate measurementsleadtothe bestfit.It’slikelythatyourdustcollectorhasbeenmodified
overthe yearsdue topermittingissuesorchangesinyourprocesswhichcalledfora reconfiguration
of the Baghouse.Inthiscase OEM configurationswill notfitandyouwill needtoobtainaccurate
measurementsforyourfiltersbeforeorderingreplacementfilterbags.If youcurrentlyhave filter
bags installedthatare functioningproperly,youcanremove one of these bagstoget the proper
measurementsforyourreplacementorder.A spare bagthat hasnot beenusedyetcan alsobe
measuredif available.However,be sure toverifythe bagmeasuredisthe same asthe bags currently
beingusedinthe dustcollector.If youare removingausedbag to measure,pleasebe sure touse all
necessaryprecautionarymeasuressetinplace priortoremoval i.e.gloves,protective garmentsand
respiratoryequipmentif needed.Itisbestnotto relyonlyonthe numbersoff the unitof OEMfilter
specificationsbecauseof possible changestothe configurations.Of course the bestsolutionisto
mail the manufacturera newor usedbagthat can be useda guide sample.
Flat Width:Place the filterona flatsurface such as a large table or cementfloor.Withthe filter
stretched out,pressdownonthe side.Usinga measuringtape,veryaccuratelyrecordthe width.Be
sure to holdthe filterdownfirmlyonanevensurface whentakingthismeasurement.
Diameter:When measuringthe tube sheetholeof apulse jetstyle dustcollector,firstmake sure the
hole hasnot beendamagedorwarpedinany way.Cleanthe surface thoroughlywithawire brush
thenusinga micrometer,measure the holeinbothdirections.If the measurementsare atall
differentlocate anotherholdandrepeatthis process.
Length: Remove the filterfromthe unit.Preferablywiththe assistance of anotherperson,stretch
the filterout.While maintainingtensiononthe filterrecordthe lengthfromthe longestpointat
each endusinga measuringtape.Donotinclude andstraps,metal caps or otherhanginghardware
inthe measurement,justthe lengthof the filteritself.
Epitropic Felt Antistatic
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Step 3– Top & Bottom Construction
The top and bottom construction of a filter bag involves a variety of possible configurations.
Identifying the type of cleaning process used by your dust collector will help to determine which
configuration is needed. The most common types of dust collectors are “Pulse-Jet” “Shaker”
“Reverse Air”.The chart belowcanhelpyouidentifywhichtype of dustcollectorfilteryouare using.
Filter Configuration Chart
Pulse-JetDustCollectors(Reverse jet) – Foundinalmosteveryindustrial environment.Theyare the
mostpopulardesignandare seeninnearlyall industrysegments.Pulse-JetUnitscanbe dividedinto
twomajor groupsTop loador bottomload unitssometimecalledtopentry(walk-inplenum) or
bottomentry(commoninbinvents) because of the pointof entryusedtochange outthe filters.
Typical filterconfigurationforatop loadunit: Snap Band Top (double-beadedring) DiskBottom(w/o
wearstrip)
Typical filterconfigurationforabottomloadunit:Raw End Top Disk Bottom(w/owearstrip)
Shaker Dust Collectors(Mechanical Cleaning) – Usuallyfoundinolderapplicationswhere
unscheduleddowntime isnota majorconcern.
Typical filterTopConfigurations Loop Top GrommetTop Strap or Tail Top Metal Hangeror Cap
Typical FilterBottomConfigurations Corded Cuff with Clamp Snap Band (Double-BeadedRing)
Reverse-AirDustCollectors– Usuallyfoundin verylarge airhandlingenvironmentssuchaspower
generationandcementplantsalthoughtheydohave usesinavarietyof industries.Sometimes
calleda structural bag,these filtersusuallyhave aseriesof supportringsspacedeveryfew feet
throughoutthe lengthof the bag.
Typical Top Configurations Compression bandw/MetalCap &Hook
Typical BottomConfigurations Compression band SnapBand Cord w/MetalClamp
Snap Band Raw Edge
Cord Hanger
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Grommet Loop
Strap Support Ring
Rubber O-Ring Disk
Disk With Wear Strip Flange
Hem Sewn Flat
Envelope
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Step 4– Additional Options
Ground Wires – Use to comply with Factory Mutual requirements for static dissipation.
Ground wire can be made from stainless steel or copper however this technique only works
on a localized area of the filter. For optimal static dissipation look at conductive fiber filter
made with Epitropic or Stainless Steel fibers.
Wear Cuffs – Used to combat abrasion at the bottom of the bag either from a sandblasting
effect or from bag-to-bag abrasion due to turbulence in the bag house. Usually 2 to 4 inches
in length and made of a material similar to that of the body of the filter bag.
Special Finishes – There are many finish options that can be added to the filter media at the
time it is manufactured. Please refer to the materials selection area for further details. If you
want to order a specific brand or special type of finish please add that request into the
additional comments section when ordering.
