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4300Catalog GeneralTechnical Step2:DetermineTubeO.D.andWallThickness ReturnT DeterminingTubeSize I o ndex forHydraulicSystems UsingTablesU15andU16,determinethetubeO.D.andwallthick- nesscombinationthatsatisfiesthefollowingtwoconditions: Propertubematerial,typeandsizeforagivenapplicationand A. Hasrecommendeddesignpressureequaltoorhigher typeoffittingiscriticalforefficientandtroublefreeoperationof thanmaximumoperatingpressure. thefluidsystem.Selectionofpropertubinginvolveschoosing B. ProvidestubeI.D.equaltoorgreaterthanrequiredflow therighttubematerial,anddeterminingtheoptimumtubesize diameterdeterminedearlier. (O.D.andwallthickness). DesignpressurevaluesinTablesU15andU16arebasedonthe Propersizingofthetubeforvariouspartsofahydraulicsystem severityofservicerating"A"(designfactorof4)inTableU10, resultsinanoptimumcombinationofefficientandcosteffective andtemperaturederatingfactorof1inTableU11. performance. Ifmoresevereoperatingconditionsareinvolved,thevaluesin Atubethatistoosmallcauseshighfluidvelocity,whichhas TablesU15andU16shouldbemultipliedbyappropriatederating manydetrimentaleffects.Insuctionlines,itcausescavitation factorsfromTablesU10andU11beforedeterminingthetube whichstarvesanddamagespumps.Inpressurelines,itcauses O.D.andwallthicknesscombination.ContacttheTubeFittings highfrictionlossesandturbulence,bothresultinginhighpres- Divisionwhenindoubt. suredropsandheatgeneration.Highheataccelerateswearin movingpartsandrapidagingofsealsandhoses,allresulting Allowabledesignstresslevelsandformulausedtoarriveatthe inreducedcomponentlife.Highheatgenerationalsomeans designpressurevaluesaregiveninthefollowingchart.Values wastedenergy,andhence,lowefficiency. inTableU8areforfullyannealedtubing. Toolargeofatubeincreasessystemcost.Thus,optimumtube sizingisverycritical.Thefollowingisasimpleprocedurefor AllowableDesign sizingthetubes. MaterialStressfoDesignTube andType Factorof4at72�F Specification Step1:DetermineRequiredFlowDiameter SAEJ356,J524, SteelC-1010 12,500PSI J525 UseTables U13 and U14 to determine recommended flow SAEJ2435, diameterfortherequiredflowrateandtypeofline. SteelC-1021 15,000PSI J2467 Thetableisbasedonthefollowingrecommendedflowveloci- Steel,High SAEJ2613, StrengthLowAlloy 18,000PSI ties: J2614 (HSLA) Pressurelines--25ft./sec.or7.62meters/sec. StainlessSteel ASTMA213, 18,800PSI Returnlines--10ft./sec.or3.05meters/sec. 304&316 A249,A269 Suctionlines--4ft./sec.or1.22meters/sec. AlloySteelC-4130 18,800PSI ASTMA519 SAEJ528, Ifyoudesiretousedifferentvelocitiesthantheabove,useone Copper,KorY 6,000PSI ASTMB75 ofthefollowingformulaetodeterminetherequiredflowdiameter. Aluminum6061-T6 10,500PSI ASTMB210 FlowinGPM Monel,400 17,500PSI ASTMB165 TubeI.D.(in.)=0.64 Velocityinft./sec. OR TableU8--DesignStressValues Flowinlitersperminute TubeI.D.(mm)=4.61 Velocityinmeters/sec. DesignPressureFormula(LAME'S) D2-d2 P=S 2 where: (D2+d) D=Outsidediameteroftube,in d=Insidediameteroftube(D-2T),in P=Recommendeddesignpressure,psi S=Allowablestressfordesignfactorof4,psi T=Tubewallthickness,in. TableU9--DesignPressureFormula Forthinwalltubes(D/T10)thefollowingformulamaybe Used:P=2ST/D Dimensionsandpressuresforreferenceonly,subjecttochange. U15 ParkerHannifinCorporation TubeFittingsDivision Columbus,Ohio http://www.parker.com/tfd
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