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BasicParkerHoseConstructions Advantages:Economyandlonglengths. Disadvantages:RequireswiderIDandODtoler- ancerangethanmandrelmadehose,limitedpressure capabilities. ConstructionElements Ahoseisgenerallycomposedofthreeelements,each withanimportantroleintheoverallperformanceof thathose.Thethreeelementsare: TheTube(usuallyrubber)mustbecompatiblewith andabletocontainthematerialbeingconveyed.As RigidMandrel�Braided shownonpage212,manyrubbercompoundsare usedfortubeconstruction,dependinguponthemate- Hoseproducedbythismethodissupportedonarigid rialthehoseisdesignedtotransmit. metalmandrelandishandledhorizontallyduringpro- duction.Whilearigidmandrellimitsthehoselength, TheReinforcementisthestrengthmemberofthe itensuresgoodcontroloftheinsidediameter.Italso hose.Itenablesthehosetowithstandinternaland offerssufficientsupporttothetubethateitherwireor externalpressureandabuse.Thereinforcementmay textilereinforcementmaybeappliedathightensions, beappliedbyseveralmethods,andconsistsofcotton whichisnecessaryinhighpressureconstructions. yarns,syntheticyarns,wireoracombinationofthese. Afterthecoverisapplied,thehosemaybewrapped Ifasuctionorvacuumcapabilityisarequirement,a tightlywithnylontapeforcuring,givingthefamiliar helixwiremaybepartofthereinforcement. "wrapped"appearancetothecover. TheHoseCoverprotectsthereinforcementfrom SizeRange:1/2in.through4in.ID abuseordamage.Thecoverisusuallyarubbercom- poundselectedforitsresistancetotheenvironment, TypicalUses:HeavyDutyair,steam,andpetroleum although,insomecases(firehose)thereinforcement transfer. willalsoactasthecover.Typicalconsiderationsin Advantages:Closetolerancesoninsidediameter, selectingacoverstockaretheneedtoresistabra- highpressureratings,goodlengthstability. sion,ozone,weatherandsunlight,chemicaloroil spillage,etc. Disadvantages:Highercostthannon-mandrel. Lengthsrestrictedtolengthofmandrels. ConstructionMethods SeveralmethodsareusedtomanufactureParkerhose. Factorssuchassize,pressurerequirements,cost rangerequiredandtheapplicationdeterminetheselec- tionofanyparticularhosestyle.Followingisadescrip- tionofthevariousconstructionmethodsemployedby Parker. FlexibleMandrel Theflexiblemandrelmethodcombinesthelonglength advantageofnon-mandrelhosewiththecloseinside diametertolerancesandhighpressureratingsofrigid mandrelhose.Thisisachievedbybuildingthehose HOSESafety&TechnicalData onalonglengthmandrelmadeofflexibleplasticor rubber. Non-Mandrel SizeRange:1/4in.through1in.ID Non-mandrelhoseisconstructedbypassinglong TypicalUses:Highpressure,air,water,LPGand lengthsofextrudedtubematerialthroughamachine steamhoses. whichaddsthereinforcementinbraided,spiraledor knittedlayers.Inthismethod,thehoseisnotbuilton Advantages:Longlengths,closetolerancesonI.D., amandrel,thereforelengthsarenotrestrictedtothe higherpressureratingsthannon-mandrelproduced lengthofthemandrels. hose. SizeRange:3/16in.through1-1/2in.ID Disadvantages:Highercostthannon-mandrelhose, notavailableinIDsizesaslargeasrigidmandrel TypicalUses:Air,Waterorgeneralpurposeservice hose. whereoperatingconditionsarenotsevere. ParkerHannifinCorporation 203 IndustrialHoseProducts www.safehose.com 203
Goodyear Rubber Products
