venturi flow meters - valveIT srl€¦ · However, Venturi tubes offer advantages including an...

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venturiflowmeters1.GeneralDescription

Comparing with orifices and flow nozzles, the Venturi tube generally is of a little more complicatedstructure, requiresmorematerial and costs and tends tobe larger in size.However,Venturi tubesofferadvantagesincludinganextremelylowpressureloss,ahigherdurabilityandalowerchanceofcatchingasludgemediaandsedimentthanotherthrottleelements.The Venturi tube is mostly used for measurements of flow wherever a minimal loss of pressure isimportant.

ThevalveeITVenturiTubeisdesignedandmanufacturedinfullcompliancewithISO-5167andASMEMFC-3Mstandards2.Specifications

¨Venturitubetype: machinedtypeorascasttype weldedtype tetragonducttype¨Endconnection: butt-weld flanged(slip-on&weldingneck)¨b-ratio-range: machinedtype:bbetween0,4and0,75incl. weldedtype:bbetween0,4and0,7incl.

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¨throatcalculationcodes: ISO-5167ASMEMFC-3ML.K.SPINK.AGANO.3.

¨Options-1: Pressuretappingsleadingintopiezometerring¨Options-2: FullJacketorSemiJacketforHeatingorCooling3.MeasuringPrincipleThelinefluidisforceddownwardsimilartoasegmentalorificeplate,butisguidedalongaslopping“wedge”shaperatherthanasharpedge.Thepressuretapsarelocatedupstreamanddownstreamofthewedgeandinallcasesareequippedwithsealedsensors.Thedifferentialpressureproducedbythedeviceisafunctionofthewedgesegmentopening(H)andthediameterofthebody,D.4.DrawingsGenerally,Venturitubewithamachinedconvergentcanbeusedinpipesofsizebetween2”and10”.However,inthecasethatthemachinedtypeisoflargesize(8”or10”),theyhavedisadvantagesbecauseofrequiredhighercostsduetohugematerialconsume.

MachinedType:FlangedEnd

Constructionwithjacket

WeldedType:FlangedEnd

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WeldedType:ButtWeldsEnd

Dimensionsofwdgeflowmeterstype:

5.valveITDesignStandards¨ConicalConvergent Angle:21°±1°¨ConicalDivergent Angle:15°±1°¨Endconnection: butt-welds

flangedconnectionisavailableonrequestaswelding-neckorslip-on-type

¨Tappingadaptors: ½”NPTOthersareavailableonrequest(i.e.½”SW,¾”NPTorSW,etc)

¨TappingNos: 1 (one) upstream pressure tapping and 1(one) downstreampressureTapping

Theremaybeusedwithseveralsetsofpressuretappingsonrequest.6.TetragonDuctandTaplesstypeVenturiTetragonDuctThetetragonisdesignedandmanufacturedinordertofitintotetragonducttypepipingandthethroathave the same area with its throat diameter calculated by ISO-5167, ASME MFC-3M or L.K.SPINK.-standards.

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TaplessThetaplessVenturitube,whichhasnoneedofpressuretappingsfordifferentialpressuremeasurement,canbeeffectivelyused(withlesspressuredrop)forflowmeasurem.ofaslurryfluid,afluidwithsuspensions,oracorrosivefluid.Itcanalsojmeasurealiquidwhichsolidifiesatlowtemperatures,oraliquidwhichvaporizesathightemperatures.

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7.Equations