flange orifice flow meter - valveit .flange orifice flow meter orifice flange assemblies description

Download Flange orifice flow meter - valveIT .Flange orifice flow meter Orifice flange assemblies Description

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  • valveITsrl viaCadutidiReggioEmilia,27 40033|CasalecchiodiReno|Bologna|Italy VATIT03007691201 ph+39.051.9912714|emailinfo@valveit.com www.valveit.com sharecapitalEur100.000,00

    FlangeorificeflowmeterOrificeflangeassembliesDescriptionOrifice flangeassemblies areused in conjunctionwithorificeplates for flowmeasurementof smaller ormedium size pipes at lower ormedium pressure ranges. The flange connection is of a RF type and thedifferentialpressuretappingsystemiswithflangetaps.Specificationorificeflangetypes:

    slip-onRFweldingneckring-jointweldingnecklargeorsmalltonguaface

    nominaldiameters:

    25mm(1)to500mm(60)aboveonrequestflangerating:

    ASME, 300, 600, 900, 1500, 2500 lbs (RF, RTJ)(ASMEB16.36ASMEB16.47AandB

    API2000,3000,5000,1000015000(API6)flangematerial

    carbonsteel,StailessSteel,exoticmaterial,duplexmaterial.materialsofboltsandnuts:

    studbolts:A193-B7,B8,etc.nuts:A194-2H,8,etc.jackboltsandnuts:A193-B7,B8etc.

    gaskets:

    sheetgaskets1.5mm(ASMEB16.21)spiralwoundedgasket4.5mm(ASMEB16.20)

    pipingconnectionmethod:

    ANSI:buttweldingtype(ASMEB16.25)

  • valveITsrl viaCadutidiReggioEmilia,27 40033|CasalecchiodiReno|Bologna|Italy VATIT03007691201 ph+39.051.9912714|emailinfo@valveit.com www.valveit.com sharecapitalEur100.000,00

    TypeSlip-onflangesTheslip-onflangehasalowhubbecausethepipeslipsintotheflangepriortowelding.It isweldedbothinsideandoutsidetoprovidesufficientstrengthandpreventleakage.Slip-onflangesareallboredslightlylargerthantheO.D.ofthematchingpipe.Theyarepreferredoverweldingneckflangesbymanyusersduetotheirlowerinitialcost,butfinalinstallationcostisprobablynotmuchlessthanthatoftheweldingneckflangebecauseoftheadditionalweldinginvolved.SocketweldingflangesThe socket welding flange is similar to the slip-on flange except it has a bore and a counter boredimension. The counter bore is slightly larger than O.D. of the matching pipe, allowing the pipe to beinsertedintotheflangesimilartoaslip-onflange.ThediameterofthesmallerboreisthesameastheI.D.ofthematchingpipe.Arestrictionisbuiltintothebottomoftheborewhichsetsasashoulderforthepipetothereston.Thiseliminatesanyrestrictionintheflowwhenusingasocketweldingflange.WeldingneckflangesTheweldingneck-flangeisnormallyreferredtoasthehighhubflange.Itisdesignedtotransferstressestothepipe,therebyreducinghighstressconcentrationsatthebaseoftheflange.Theweldingneckflangeisthebestdesignedbutt-weldedflangeofthosecurrentlyavailablebecauseofitsinherentstructuralvalue.Itisexpensivebecauseofthedesign.

  • valveITsrl viaCadutidiReggioEmilia,27 40033|CasalecchiodiReno|Bologna|Italy VATIT03007691201 ph+39.051.9912714|emailinfo@valveit.com www.valveit.com sharecapitalEur100.000,00

    PressuretapconnectionsPressureconnectionholesinthepipeshouldbe1/2for4andlargerlines,3/8for3linesand1/4for2 lines.When flange tapsareused, insertadrillof theproper size through theconnectionholes in theflangesanddrillthroughthepipe.Whenconnectionsinthepipeareused,weldhalf-couplingstothepipeattheproperlocations,insertadrillthroughthem,anddrillthroughthepipe.Roundofftheedgesoftheholesslightlytobesurethatnoburrsremaininthepipe.FlangetapsPressure connection holes are located in the flanges 1 upstream and 1 downstream from thecorrespondingorificeplatefaces(seefig.4andfig.5)

    CornertapsOnlinessmallerthan2,theorificeflangeunionshowninfig.6isused.Theeffectisthatthepressuretapsarerightattheorificeplate.

  • valveITsrl viaCadutidiReggioEmilia,27 40033|CasalecchiodiReno|Bologna|Italy VATIT03007691201 ph+39.051.9912714|emailinfo@valveit.com www.valveit.com sharecapitalEur100.000,00

    2,5Dand8Dtaps,alsocalledfull-flowpipetapsConnectionsare installed2,5pipe-diametersupstreamfromtheupstreamfaceof theorificeplateand8pipediametersdownstreamfromtheupstreamfaceoftheorificeplate.

    1Dand0,5Dtaps,alsocalledradiustapsThistypeofconnectionismodificationofandhaslargelyreplacedtheVenaContractataps.Ityieldsequallyaccurateresultsandhastheadvantagethatthedownstreamconnectioniseasiertolocate.Theupstreamconnection should be at 1D above the upstream face of the orifice plate, but locationof the upstreamconnectionanywherebetween0,5and2Dintroducesonlynegligibleerror.Thedownstreamconnectionislocated0,5Cfromtheupstreamfaceoftheorificeplate.

    VenaContractatapsThe upstream connection (dimensionM)may be located anywhere between 0,5 and 2 pipe diametersabove theupstream faceof theorificeplate. Thedownstreamconnection (dimensionN) ismadeat thepointofmaximumflowconstrictionandisgivenbythetablebelow:

  • valveITsrl viaCadutidiReggioEmilia,27 40033|CasalecchiodiReno|Bologna|Italy VATIT03007691201 ph+39.051.9912714|emailinfo@valveit.com www.valveit.com sharecapitalEur100.000,00

    OrificemeterrunsDescriptionOrifice meter runs are used for measuring the flow at higher accuracy. The orifice meter runs aretherefore,nottheonessimplyweldpipestoupstreamanddownstreamsidesoranorificeassembly,buttheonesweldingsmallerinsidediameterpipestosmallerdiameterofflanges,then,finishinsidediameterorthepipe/flangeassemblybyboringorhoningtothespecifieddimensionswiththerequiredtolerancesandsurfaceroughness(seefig.20andfig.21).TypeanddrawingOrificemeterrun(bothsidesfanged):

  • valveITsrl viaCadutidiReggioEmilia,27 40033|CasalecchiodiReno|Bologna|Italy VATIT03007691201 ph+39.051.9912714|emailinfo@valveit.com www.valveit.com sharecapitalEur100.000,00

    iOrificemeterrun(buttweldingends)

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