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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