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4300Catalog GeneralTechnical ReturnT TubeFittingsPressureDrop I o ndex Inhydraulicsystems,pressuredroprepresentslossofenergyand dropsatvariousflowratesthroughfittingsforfluidindicated.To thereforeshouldbekepttoaminimum.Pressurelossinstraight determinepressuredropforagivenflow,traceaverticallineup tubingandhoseismainlycausedbythefrictionalresistance fromtheflowaxistothedesiredsizelinethentraceahorizontal ofthewalls,whileinfittingsitismainlycausedbychangesin linefromthisintersectionovertothepressuredropaxis. themagnitudeordirectionofthefluidvelocity.Mathematical Example:Asize8CTX,withoil,similartothetestfluid,flowing analysisofpressuredrop,eventhoughpossible,maynotbe throughitat4gallonsperminute,wouldcauseapressuredrop exactbecauseoftheinterrelationshipoffactorssuchasfluid ofapproximately2.3psi.Conversionswillhavetobemadefor density,velocity,flowareaandfrictionalco-efficients. fluidswhicharenotsimilartotestfluid. Thefollowingpressuredropchartswerederivedfromactual TheTubeFittingspartnumbersarelistedbelowthePressure testdataandmaybeusedasaguidefordeterminingpressure DropCharttowhichtheyapply. Examples: Fig.U2--PressureDropChartfor90�FittingsorBranchPathThroughaTeeorCrossFitting(Triple-Lok) PressureDropsforOtherFitting: *ThesepressuredropcurveswereestablishedwithTriple-Lokfittings.Thepressuredropvaluescanbeadjustedforother fittingsofthesamesizebymultiplyingthevaluefromthechartbytheratioofTriple-Lokflowdiametertothatoftheother fitting,raisedtothe4thpower. Example: Findpressuredropfor6C5Lat5gallonsperminuteflowrate: Fromthechart,thepressuredropfor6C5Xis10psi. Also,theratioof6C5Xto6C5Lflowdiametersis0.297/0.264,or1.125. Therefore,thepressuredropforSeal-Lok=10x(1.125)4=16psi. PressureDropsforOtherFluids: Pressuredropthroughafittingismainlycausedbychangeindirectionandvelocityofthefluid.Therefore,itisdirectlypropor- tionaltothespecificgravityofthefluid.Thedropduetofriction,whichisdependentontheviscosityofthefluid,issosmallin thiscasethatitcanbeignored.Thus,thepressuredropwithadifferentfluidcanbecalculatedbymultiplyingthevaluefrom thegraphabovebytheratioofspecificgravityofthetwofluids,or: SpecificGravityofNewFluid NewDrop=Valuefromthegraphx SpecificGravityofTestFluid(0.873) Dimensionsandpressuresforreferenceonly,subjecttochange. U22 ParkerHannifinCorporation TubeFittingsDivision Columbus,Ohio http://www.parker.com/tfd
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