Flow nozzle flow meters - Water - HVAC · a cylindrical throat and a divergent section. The...

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Flownozzleflowmeters1.GeneralDescriptionAflownozzleistobeinstalledinapipeline.Whileafluidisflowingthroughthispipelineduetothenozzleapressuredifferenceisgenerated.Fromthevalueofthispressuredifference,whichcanbemeasuredbyadifferentialpressuretransmitter,theflowratecanbecalculated.Flow nozzles are designed to work with high pressure and high temperature applications. Theirconstruction ismore rugged than orifices. They allow the flowofmore than 60 percent greater volumethanorificesdo.Theyarelesssensibleagainstsolidparticlesinthefluid.Also,theyareapplicableforhigh-speedflowingfluids.Wecanprovidethenozzlesassembledinameasurementsection,inlet4Dandoutlet2D.AvailableStandards:

-ISO-5167-ISA1932–Venturi-Nozzles–ASMEMFC-3-ASMEPTC-6

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2.SpecificationsISO-5167Nozzletype: Longradiusnozzles 1.Highratio:0,25≤β≤0,8 2.Lowratio:0,2≤β≤0,5 ISA1932Nozzle,Venturi-NozzleASMEMFC-3M,ASMEPTC-6Nozzle 1.Highratio:0,5≤β≤0,8

2.Lowratio:0,2≤β≤0,53.Lowratio,withthroattap:0,25≤β≤0,5

PressureTaps:

PipeWallTapsatD&D/2,ThroatTap

Throatcalculationcodes: -ISO5167

-ASMEMFC-3M -L.K.SPINK -AGANo.3Constructiontypes:

-Weld-intype -Holdingringtype

-Knockpintype -FlangedtypeEndconnection: -Butt-weldtype -Flangedtype

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3Nozzletypes3.1ISO5167NozzletypesinfullcompliancewithISO-5167–TwotypesoflongradiusnozzlesHighrationozzlesLowrationozzle

3.2ASMEMFC-3M-NozzletypesinfullcompliancewithASMEMFC-3M-ASMEPTC6forthroattap-3Typesoflongradiusnozzles:

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4NozzleDesigns4.1FlangedTypeFlangedtypeflownozzlesareinsertedbetweenpipeflanges.

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4.2Weld-inFlowNozzlesWeld-in flow nozzles are used where flanges are not applicable, such as high temperature and highpressureapplications.

4.3HoldingRingTypeTheholding ring flownozzledesigneliminates theweldingofdissimilarmaterials,because the ring,pinsandpipearemadeofcompatiblematerial.

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4.4Knock-PinTypeKnock-pinflownozzlesavoidweldingoperationbetweendissimilarmaterials.

4.5VenturiTypeTheprofileofaVenturi-nozzleisaxis-symmetric.Itconsistsofaconvergentsectionwitharoundedprofile,acylindricalthroatandadivergentsection.TheupstreamfaceisidenticalwiththatofanISA1932nozzle.Theupstreamtappingsshallbecornertappings.Thetappingsmaybelocatedinthepipeoritsflangesorincarrierrings.Thethroatpressuretappingsshallbecompriseatleast4singlepressuretappings.Piezometerringonrequestonly.

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5TypicalConstructionofFlowNozzlewithThroatTap[ASMEPTC-6-Standard]

6PressureTapping