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FlangeInsulationKitsFlange insulation sets are used in
flangeapplicationwhereelectricalisolationandgalvaniccorrosion
resistance are required. The kits areused as an insulator between
dissimilar metalflanges or to electrically isolate sections of
pipeworksinacathodicprotectionsystem,preventingthe flow of
electrostatic charge along thepipelines. They are designed to
minimize theeffects of electrochemical corrosion. Theinsulation kit
consist one full length sleeve,
twoinsulatingwashersandtwosteelwashersforeachoftheboltsintheflangeassembly.
CORROSIONCONTROLSYSTEMSmith Gaskets a division of Smith
International Gulf Services excelled inmanufacturing of gaskets and
sealingproductstoOil&Gasindustrysincepasttwodecades.OvertheyearsSmithGasketshaveenhancedengineering,technicalandmanufacturingcapabilitiestodevelopmorenewproductsandservicestocustomersglobally.
TypeEGasketsOutsidediameterofthistypegasketsextenduptotheexternaldiameteroftheflange.Thisgasketconsistsofboltholes,
this helps to automatically align and center the gaskets and gives
optimum protection against
foreignparticleswhichcanshortouttheflange.TypeFGasketsThistypeofgasketfitswithintheboltcircleoftheflange.Externaldiameterofthegasketextenduptotheinsidediameteroftheboltholecircle.TypeDGasketsThistypeofgasketisRTJstylehoweverSmithGasketscorrosioncontrolsystemHPgasketsarebestalternativetotheRTJstylegaskets.
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CORROSIONCONTROLLSYSTEMHP
HPInsulationKitCharacteristics
HP insulation gaskets have been specially designedfor critical
services to withstand corrosiveenvironments. Apart from the
excellent
sealingcharacteristicsandsuperiordielectricproperties,HPisidealforgeneralsealingapplications.ThisgasketissuitableforRaisedFace,FlatFaceandRTJflangesinallpressureclasses.HPgasketconsistsofPTFEspringenergizedfacesealfixedtotheisolatinglaminates,whichispermanentlybondedtothemetalgasketcore.Duetotheenhanceddesign
of PTFE spring energized seal, HP requiresless bolt stress to make
effective sealing, also theenergized action helps to eliminate
costly leaks andfugitiveemissions.
Insidediameterof theHPgaskets isexactlymatching to the
flangeborewhicheliminate turbulent flowandflange face
corrosion/washout. This gasket withstands severe critical service
condition like vibration,temperatureandpressurefluctuations.
Applications; Insulation between dissimilar metal flanges to
prevent
galvaniccorrosion.
Flangeinsulationinconjunctionwithcathodicprotection.
Wellheadisolationfrominterconnectedflowlines.
MatingmismatchedRTJflangetoRaisedFaceflange.
EliminatefluidtrapcorrosionbetweenRTJflangeswhere
highCO2,H2Sandotheraggressivemediaarepresent.
Eliminateturbulenceandflowinducedcorrosionbetween
RTJflanges. Protect against coating impingement on coated
flange
face. Tosealbetweenflangessubjectedtovibration.
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MetalCore
o
GasketcoreshallbemadebysolutionannealedSS316LStainlessSteel,othermaterialareavailableuponspecialorder.
GasketIsolationRetainer
o NEMALI1GlassReinforcedEpoxyLaminateMaterial.Properties G10
G11CompressiveStrength,PSI 60,000 55,000FlexuralStrength,PSI 66,000
60,000TensileStrength,PSI 50,000 50,000DielectricStrength,Volts/mil
550600 550OperatingTemperature,0C Cryogenicto150
Cryogenicto180WaterAbsorption,% 0.1 0.12InsulationResistance,M
200,000 200,000
SealMaterialo
Sealelementsarespeciallydesignedandintendedtoworkasaspecialbarrierthroughwhich
no contained media or other substance can pass through. Special
grooves on the
retainerencapsulatethesealandthusholdthesealinplaceinstatic.Teflonsealisthestandardoptionwhichwill
coverall
conditions;helicalwoundedspringprovidesenergizedspringactionandspecialsealgrooveminimizescreeporcoldflow.
Sleeveso
MylarsleeveisthestandardoptionhoweverGREandothersleevescanbemadeavailableupon
request.Allsleevesshallbeprovidedwithfulllength,asshortlengthsleevesmaynotprovidetheadequatelevelofelectricalinsulationprotection.Mylar
is the best choice for the standard application as it has
relatively good resistance
tocrushing,cracking,breaking,moreoveritislessexpensivethantheGREsleeves.SmithdoesnotrecommendPhenolicmaterialtobeusedduetoitsunreliablecharacteristics.
Washerso
GREwashersarethestandardoption;purposeofthewashersistoelectricallyinsulatethenuts
fromtherestof the
flangeassembly.SmithofferhighqualityGREwasherswhichhavemorethan60,000PSIcompressivestrengthandcanabsorbtheflangemadeupforcewithoutfail.
Steelwashersarerequiredtopreventthetwistingactionofthenutsfromscaringorgaugingtheinsulatingwashers.AllhighqualitysteelwashersshallbesuppliedwithZincplatingwhichhavehighcorrosionresistanceandmechanicalstrength.StainlessSteelandPTFEcoatedSteelwashersareavailableuponrequest.
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CORROSIONCONTROLLSYSTEMLPAdvantagesofLPgaskets
Excellentsealingsolutionforlowpressureservices.
Reliableenergizedsealprovidesextrasealing.
GREgasketretainerprovidesexcellentinsulation.
Highstrengthlaminateseliminatetheriskoffailureduetoovertorqueofthebolts.
Gasketinternalboreextendedtomatchtheboreoftheflangestoprotecttheflangefacefrom
corrosionandwashout.
Energizedsealwhichisencapsulatedinthegrooveeliminatethecoldflow.
Longlife,maintenancefreedesign.
Easy,quickinstallation,lowseatingstressrequiredhencelessforceontheflangeandbolts.
AllLPgasketretainershavethicknessof3mmandkitconsistsoffulllengthMylarsleeve,GREwasherandZinccoatedSteelwashersforeachbolt;othermaterialcombinationsmadeavailableuponrequest.GasketOrderingGuide
Size Class GasketTypeE/F FlangeType TypeofGasketHP,LP Quantity
SmithsLPgasket isanoncriticalapplicationgasketdesigned for
electrical flange isolation and
sealingapplications.Thistypeofkitisrecommendedforuseinraised
face/flat face flangesrateduptoclass300.LP gasket provides
excellent isolation and therectangular sealing element fixed in a
specialdesigned groove makes for effective
energizedsealingandisolation.LP gasket retainers are based on high
quality GRElaminates, which have excellent dielectric strength,very
good mechanical properties and sealingcharacteristics. This LP
design can easily replaceunreliable, failure prone phenolic based
gaskets.These gaskets are available in two models such
asRaisedRaceandFullFace,alsoavailableinallflangeconfigurationssuchasASME,DIN,JIS,ISOetc.PTFEisthestandardsealoptionhoweverothersealmaterialsareavailableonrequest.
