What is Nominal Diameter (DN)? - Trenchlesspedia
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Nominal Diameter is also known as the mean or average outside diameter and is represented by DN. It is neither equal to the inner diameter ... Dictionary Dictionary TermoftheDay ContactGrouting Contactgroutingistheprocessoffillingvoidsbetweentwosurfacesthatareincontactwitheachother.Thereareavarietyofapplicationsforcontactgroutingintheinstallationandrehabilitationofpipes.Thedevelopmentoftrenchlessconstructiontechniqueslikegroutingcontributestothe... 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Advertisement Dictionary TrenchlessConstruction HorizontalDirectionalDrilling NominalDiameter(DN) NominalDiameter(DN) Lastupdated:March4,2021 WhatDoesNominalDiameter(DN)Mean? NominalDiameterisalsoknownasthemeanoraverageoutsidediameterandisrepresentedbyDN.Itisneitherequaltotheinnerdiameter(ID)northeouterdiameter(OD)ofthepipe.Nominalisawordthatdenotesnon-specificityandinthiscase,identifiestheapproximateinnerdiameterwithanon-dimensionalnumber.Pipeshavingidenticalnominaldiameterscanbeeasilyconnectedorinterchangedwitheachother.PipesareavailableindifferentDNsizesandtheDNisusedtoarriveatthepipedimensionsusingstandardtablesandschedules.TheactualinnerdiameterofpipesfromdifferentmanufacturerscandeviatebyseveralmillimetersandsuchpipescanbecombinediftheDNisindicatedwithreferencetostandards. Advertisement TrenchlesspediaExplainsNominalDiameter(DN) Thevalueofthenominaldiameterisclosetotheinnerdiameterofthepipebutnotequaltoit,andisadoptedinordertounifytheconnectingdimensionsofthepipeandpipefittings.ThenominaldiameterisspecifiedusingDNfollowedbyadimensionlessnumberwhichcorrespondstotheapproximateinnerdiameterofthepipe.Generally,apipehasanouter,inner,andnominaldiameter,wherethenominaldiameteristheoneusedfordesigndrawings.Thisstandardisconvenientfordesigningandmanufacturingandalsoforspecifyingthenameofthepipeorpipefitting.Pipesaremanufacturedfromavarietyofmaterialssuchasconcrete,castiron,polyethylene(PVC),high-densitypolyethylene(HDPE),andglass-reinforcedplastic(GRP).Forplumbingworks,pipesizeisreferredtoasnominalpipesize(NPS)whosemetricequivalentisthenominaldiameter(DN)andconformtotheInternationalStandardsOrganization(ISO).Thetermsnominalbore(NB)andDNareusedinterchangeablywithNPS.DNistheEuropeanequivalentofNPSbutshowspipesizesdifferentlythanNPS.A2-inchpipemaysimplybereferredtoasDN50andtoconvertNPStoDNithastobemultipliedby25.BasedontheNPSandpipeschedule,theODandpipethicknesscanbeobtainedfromstandardreferencetables.ForaspecifiedNPS,theODremainsconstantandthewallthicknessincreaseswiththeschedule.Similarly,foragivenschedule,theODwillincreasewithNPSwhilethicknessstaysconstantorincreases. 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