Application Engineering Training-液壓軟管接頭選型和失效分析

Workshopcomponentsforfluidhandlingsystem.SpecmaHydraulic,Shanghai20012-09-03Agenda:Identifyingdifferentportsinvalves,engineetc.

IdentifyingdifferentsealingsystemsonhoseandpipeAssemblyinstructionsandrecommendations.DifferenthoseconstructionsParametersthateffectthelifelengthofthehose.

Parameterstothinkaboutduringhoseinstallation.Checkpointsatserviceonmachineinfield.

Identifyingdifferentportsinvalves,engineetc.BoundedsealCoppersealingCuttingedgeO-ringEDsealing(softsealing)O-ringwithretainingringDifferenttypeofsealingsystemsBoundedsealBoundedsealisusedbetweentheadapterandtheportCoppersealingCopperringisusedbetweentheadapterandtheportCuttingedgeAsharpedgeontheadapteriscuttingintothesurfaceoftheporttoreachthesealing.O-ringStandardO-ringisusedtocreatethesealing.Achamberintheportiscreatingthenecessarystability.EDsealing(softsealing)Aprofiledsoftsealingisadaptedinagrooveontheadapter.O-ringwithretainingringTheretainingringisusedasasupportringtomakethesameeffectasthechamberandED-sealing.AstandardO-ringisused.Conicalsealing,BSPT/NPTFThesealingismadebytightentheadapteruntiltheleakageisstopping.Thissolutionshouldnotbeusedonnewinstallations.BoundedsealCoppersealingCuttingedgeO-ringEDsealing(softsealing)O-ringwithretainingringDifferenttypeofsealingsystemsG(BSPthread)60?sealingcone(BS)Metricthread24?sealingcone(DIN)UNFthreadJIC37?sealingcone(SAE,ISO)UNFthreadORFS90?sealingcone(SAE,ISO)Flange3000and6000psiCode61and62(SAE)SealingsystemsforhoseandpipeG(BSPthread)60?sealingcone(BS).Thesealingconeexistwithbothballformedconeandstraight60?cone,tobeassembledwithpipeyouneedtouseaweldedorbrazedcone.Metricthread24?sealingcone(DIN),canbeusedwithcuttingringbothonpipeandhosefitting.Metricthread24?sealingcone(DIN),ForasaferapplicationaconewithO-ringcanbeused,togetherwithaformedconeonthepipeyougetaverysecureinstallation.UNFthreadJIC37?sealingcone(SAE,ISO).Metallicsealingzone.Verycommonusedworldwide,easyhandlingwithflaringofpipe.UNFthreadORFS90?sealingcone(SAE,ISO).Softsealingzone,verycommonusedworldwide,higherdemandonflaringequipment.Flange3000and6000psi.Code61and62(SAE).G(BSPthread)60?sealingcone(BS)Metricthread24?sealingcone(DIN)UNFthreadJIC37?sealingcone(SAE,ISO)UNFthreadORFS90?sealingcone(SAE,ISO)Flange3000and6000psiCode61and62(SAE)SealingsystemsforhoseandpipeExampelsofvarioushosefittingsUNF/JICStraightfemaleDifferentdropheightsThread3/16”?”?”?”5/16”3/8”3/8”3/8”?”?”5/8”5/8”3/4”3/4”3/4”1”11/4”1?”2”7/16-20?-209/16-18?-167/8-1411/16-1215/16-1215/8-1217/8-1221/2-12Angel90?femaleStraightmaleAngel45?femaleDifferenttypeofnutsHoseIDDifferenthoseinsertdependingonpressureAssemblyinstructionsandrecommendations.ParametersthateffectthechoiceofhoseSizeMediaApplicationTemperatureWorkingpressureDifferenthoseconstructionInnertubeReinforcementCoverDifferenthoseconstructionReinforcementTextile+helixspiralBraidedSpiralDifferenthoseconstructionBraidedreinforcementFlexibleLightweight/easytoassembleSpiralreinforcementHighresistanceagainstpressurePressurepeaksSpiral-orbraidedreinforcementDifferenthoseconstructionParametersthateffectthelifelengthofthehose.TwistingExperienceshowsthatlifelengthisreducedwithupto90%ifthehoseistwistedwith7degreesduringinstallation.Parametersthateffectthelifelengthofthehose.TemperatureParametersthateffectthelifelengthofthehose.Differentrubbercompoundisusedtocreatehosesthataresuitablefordifferenttemperatureranges.Thenumbersabovearetobeseenasguidelines.Temperature5093100110Lifelengthfactor1,00,60,450,25WorkingpressureParametersthateffectthelifelengthofthehose.Workingpressure%ofstatedworkingpressure100133150175Lifelengthfactor1,00,40,250,1BendingradiusParametersthateffectthelifelengthofthehose.%ofstatedbendingradius100806040Lifelengthfactor1,00,80,60,3ChangeinlengthWhenahoseisunderpressure,thelengthofthehosecanchangebetween-2%uptoo+6%.Ex.Ahosethatis2meters(6,5feet)atinstallationcanbebetween4cm(1,57inch)shorterupto12cm(4,72inch)longer.Parametersthateffectthelifelengthofthehose.Straighthoseoutofthefitting

Asaprincipleweshallalwaystrytohavethefirstpartofthehosestraightaftertheferrule.Thelengthofthispartshouldbe4timestheinnerdiameterofthehose.Experienceshowsthatifyoudecreasethislengthby50%thelifelengthwillbeupto20%shorter.Hosesthatisbendeddirectlyaftertheferrulehasupto40%shorterlifelength.Parametersthateffectthelifelengthofthehose.CleanlinessParametersthateffectthelifelengthofthehose.Thecleanlinesslevelinsidethehoseeffectthelifelengthoftheholesystem.Parameterstothinkaboutduringhoseinstallation.OnmostofSpecmaHydraulicshosesyoucanusethemarkinglineonthehosetocheckthatyouhaveavoidedtobuiltinanytwistingintheapplication.Toavoidthetwistingis,asyouknow,veryimportantforthelifelengthofthehoseassembly.RightWrongParameterstothinkaboutduringhoseinstallation.Twistingwillgiveroombetweenthewiresinthe

reinforcement.Thiswillresultinleakage.Parameterstothinkaboutduringhoseinstallation.Avoidtoshorthoselength!Correctadaptedhoselengthgiveyouanbetterinstallationthatiseasiertoinstallandgivesalongerlifelength.RightWrongParameterstothinkaboutduringhoseinstallation.Installthehosewithaminimumofcurves.Theexampleaboveshowshowyoucanreducethenumbersofcurvesfrom3to1and2to1byusing90?fittingsinsteadofstraightfittings.Thisalsogivestheeffectthatyougetabetterbendingradiusonthecurvethatareremaining.RightWrongParameterstothinkaboutduringhoseinstallation.RightWrongUsecorrecttypeoffittingtoavoidunnecessarycurvesonthehose.Thiswillresultinlessabrasionandcleanerinstallation.RightWrongParameterstothinkaboutduringhoseinstallation.ExperiencefromSpecmaHydraulicstestfacilitiesCheckpointsatserviceonmachineinfield.CracksonhosecoverTwistedhoseVolumetricchangeofinnertubeBubbleonoutercoverCrushedhoseCorrosiononhosefittingFerrulecrimpingerrorsAbrasionBurstonhoseBurstclosetofittingLeakageinsealingareaLeakagebetweenhoseandferruleFittingseparatedfromhoseCheckpointsatserviceonmachineinfield.AbrasionContinueslyabrasion

Checkpointsatserviceonmachineinfield.BurstonhosePressurepeaksTightcurvesExhaustionduringflexing.OverbendingCrushingTwistingCheckpointsatserviceonmachineinfield.BurstclosetofittingToshorthoselengthExhaustionduringflexing.IncorrectcrimpingofferruleWrongferruleCheckpointsatserviceonmachineinfield.LeakageinsealingareaWrongO-ringCrackedO-ringDamagedthreadorsealingsurfaceWrongfittingWrongtorqueWrongadapterCheckpointsatserviceonmachineinfield.LeakagebetweenhoseandferruleIncorrectcrimpingofferruleVibrationsToshorthoseDuringflexingTemperatureCheckpointsatserviceonmachineinfield.FittingseparatedfromhoseIncorrectcrimpingofferruleWronghoseinsertTemperaturePressurePressurepeaksToshorthoselengthCheckpointsatserviceonmachineinfield.CracksonhosecoverHeatradiationOzoneTohightemperatureonmediaFlexingwithverylowtemperatures.(-55degC)Checkpointsatserviceonmachineinfield.TwistedhoseCheckpointsatserviceonmachineinfield.Experienceshowsthatlifelengthisreducedwithupto90%ifthe