NPS - 'Nominal Pipe Size' and DN - The Engineering ToolBox

The size of pipes, fittings, flanges and valves are often given in inches as NPS - Nominal Pipe Size, or in metric units as DN - 'Diametre Nominal'. EngineeringToolBox-Resources,ToolsandBasicInformationforEngineeringandDesignofTechnicalApplications! NPS-'NominalPipeSize'andDN-'DiametreNominal'Thesizeofpipes,fittings,flangesandvalvesareoftengivenininchesasNPS-NominalPipeSize,orinmetricunitsasDN-'DiametreNominal'.SponsoredLinksPipesaremadeofawidevarietyofmaterials-likegalvanizedsteel,blacksteel,copper,castiron,concrete,andvariousplasticssuchasABS,PVC,CPVC,polyethylene,polybutyleneandmore.Pipesareidentifiedby"nominal"or"trade"namesthatarelooselyrelatedtotheactualdimensions.Forinstance,a2-inchgalvanizedsteelpipehasaninsidediameterofabout21/8inchesandanoutsidediameterofabout25/8inches.Inplumbingpipesizeisreferredtoasnominalpipesize-NPS,or"NominalPipeSize".ThemetricequivalentiscalledDNor"diametrenominel".ThemetricdesignationsconformtoInternationalStandardsOrganization(ISO)usageandapplytoallplumbing,naturalgas,heatingoil,andmiscellaneouspipingusedinbuildings.TheuseofNPSdoesnotconformtoAmericanStandardpipedesignationswherethetermNPSmeans"NationalPipeThreadStraight".ISO6708-Pipeworkcomponents-DefinitionandselectionofDN(nominalsize)ISO6708definesthenominalsize-DN-asanalphanumericdesignationofsizeforreferencepurposes.ItcomprisesthelettersDNfollowedbyadimensionlesswholenumberwhichisindirectlyrelatedtothephysicalsizeinmillimetresofthebore(ID)oroutsidediameter(OD)oftheendconnections.Outsidediametersformetricandimperialstandardsareindicatedinthetablebelow.NominalPipeSize-NPSOutsideDiameter(mm)DN(mm)InchISO6708PipeworkcomponentsDINEN10220SeamlessSteelPipesDINEN10255ThreadedTubeASME103/817.2151/221.320.021.321.3203/426.925.026.926.725133.730.033.733.43211/442.438.042.442.24011/248.344.548.348.350260.357.060.360.3-21/2--73.073.065-76.176.176.1-80388.988.988.988.9-31/2--101.6101.61004114.3108114.3114.3125-139.7133139.7--5--141.3141.31506168.3159168.3168.32008219.1216219.1219.125010273.0267273.0273.030012323.9318323.9323.835014355.6368355.6355.640016406.4419406.4406.44501845747045745750020508521508508600246106226106107002871172071171180032813820813813900369149209149141000401016102010161016120048122012191219SchedulesNPS-NominalPipeSize-referencesinsidediameterofpipeIPS-IronPipeSize-initiallyasystemestablishedtodesignatethepipesizerepresentingtheapproximateinsidediameterofthepipeDIPS-DuctileIronPipeSize-referencesinsidediameterofpipeCTS-CopperTubeSize-referencesoutsidediameteroftubeCarbon,AlloyandStainlessSteelPipes-ASME/ANSIB36.10/19SponsoredLinksRelatedTopicsDimensions-Sizesanddimensionsofpipesandtubes,andtheirfittings-insideandoutsidediameter,weightandmore.PipingSystems-Dimensionsofpipesandtubes,materialsandcapacities,pressuredropcalculationsandcharts,insulationandheatlossdiagrams.RelatedDocumentsANSISchedule40SteelPipes-Dimensions-Internalandexternaldiameters,areas,weights,volumesandnumberofthreadsforANSIschedule40steelpipes.ANSISchedule80SteelPipes-Dimensions-Internalandexternaldiameters,areas,weights,volumesandnumberofthreadsforschedule80steelpipes.ASME/ANSIB36.10/19-Carbon,AlloyandStainlessSteelPipes-Dimensions-Pipesizes,insideandoutsidediameters,wallthickness,schedules,momentofinertia,transversearea,weightofpipefilledwithwater-U.S.CustomaryUnits.ASME/ANSIB36.10/19-Carbon,AlloyandStainlessSteelPipes-Dimensions-MetricUnits-Pipesizes,insideandoutsidediameters,wallthickness,schedules,weightandweightofpipefilledwithwater-MetricUnits.ASTMB88-SeamlessCopperWaterTubes-Dimensions-WaterandgascoppertubesaccordingASTMB88-typeK,LandM-imperialunits.ASTMD1785andASTMF441-PVCandCPVCPipesSchedule40&80-StandarddimensionsandweightofPVC-PolyvinylChloride-andCPVC-ChlorinatedPolyvinylChloride.AWWAC115-Ductile-IronThreadedPipe-Dimensions-Dimensionsofthreadedductile-ironpipeaccordingAWWAC115.AWWAC151-Ductile-IronPipeCentrifugallyCast-Dimensions-Dimensionsofductile-ironpipesaccordingAWWAC151/A.21.51.HotWaterHeatingSystems-OnlineDesignApplication-Freeonlinedesigntoolfordesigninghotwaterheatingsystems-metricunits.HotWaterHeatingSystems-OnlineDesignApplication,ImperialUnits-Onlinedesigntoolforhotwaterheatingsystems.ISO4427-PEPipesforWaterSupply-Dimensions-PolyethylenepipedimensionsaccordingEuropeanStandards.PipeClassRatingsvs.PressureNumbers(PN)-Pressurenumbers(PN)vs.flangeclassdesignations.Pipevs.Tube-PipesandtubesarenotexactlythesamePipeWeightCalculator-Weightcalculatingequationforsteelpipes.Pipes-FractionalEquivalents-Fractionalvs.decimalinches.Pipes-NominalWallThickness-NominalwallthicknessofseamlessandweldedcarbonandalloysteelpipesPipesandTubes-Imperialvs.MetricSizes-SIvs.Imperialpipesizes.PipeswithWaterContent-WeightandVolume-Estimatewatercontentinpipes-weightandvolume.Schedule-Terminology-Introductiontothescheduleterminologyofpipes.StainlessSteelPipes-DimensionsandWeights-Dimensions,wallthicknessandweightsofstainlesssteelpipesaccordingtoASMEB36.19StainlessSteelPipes. SponsoredLinks EngineeringToolBox-SketchUpExtension-Online3Dmodeling!Addstandardandcustomizedparametriccomponents-likeflangebeams,lumbers,piping,stairsandmore-toyourSketchupmodelwiththeEngineeringToolBox-SketchUpExtension-enabledforusewiththeamazing,funandfreeSketchUpMakeandSketchUpPro.AddtheEngineeringToolBoxextensiontoyourSketchUpfromtheSketchUpProSketchupExtensionWarehouse!TranslateAbouttheEngineeringToolBox!PrivacyWedon'tcollectinformationfromourusers.Onlyemailsandanswersaresavedinourarchive.Cookiesareonlyusedinthebrowsertoimproveuserexperience.Someofourcalculatorsandapplicationsletyousaveapplicationdatatoyourlocalcomputer.Theseapplicationswill-duetobrowserrestrictions-senddatabetweenyourbrowserandourserver.Wedon'tsavethisdata.Googleusecookiesforservingouradsandhandlingvisitorstatistics.PleasereadGooglePrivacy&Termsformoreinformationabouthowyoucancontroladservingandtheinformationcollected.AddThisusecookiesforhandlinglinkstosocialmedia.PleasereadAddThisPrivacyformoreinformation.AdvertiseintheToolBoxIfyouwanttopromoteyourproductsorservicesintheEngineeringToolBox-pleaseuseGoogleAdwords.YoucantargettheEngineeringToolBoxbyusingAdWordsManagedPlacements.CitationThispagecanbecitedasEngineeringToolBox,(2003).NPS-'NominalPipeSize'andDN-'DiametreNominal'.[online]Availableat:https://www.engineeringtoolbox.com/nps-nominal-pipe-sizes-d_45.html[AccessedDayMo.Year].Modifyaccessdate...close HomeAcousticsAirPsychrometricsBasicsCombustionDrawingTools2DSchematicDrawingsDynamicsEconomicsElectricalEnvironmentFluidMechanicsGasesandCompressedAirHVACSystemsAirConditioningHeatingNoiseandAttenuationVentilationHydraulicsandPneumaticsInsulationMaterialPropertiesBoilingPointsDensitiesMeltingandFreezingPointsViscositiesMathematicsMechanicsFastenersThreadsMiscellaneousPhysiologyPipingSystemsCodesandStandardsCorrosionDesignStrategiesDimensionsFluidFlowandPressureLossHeatLossandInsulationPressureRatingsTemperatureExpansionValveStandardsProcessControlControlValvesDocumentationMeasurements&InstrumentationFlowMeasurementTemperatureMeasurementRisk,ReliabilityandSafetyPumpsSanitaryDrainageSystemsStandardOrganizationsStaticsBeamsandColumnsSteamandCondensateControlValvesandEquipmentFlashSteamHeatLossandInsulationPipeSizingThermodynamicsThermodynamicsWaterSystemsScientificOnlineCalculator817SponsoredLinks. 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