Differential Pressure Flow Elements DP Primary …

1 Data sheet DS/DP EN Rev. E Differential Pressure Flow ElementsDP Primary Elements available with all the documentation, testing and certification that your industry needsComprehensive range of DP Primary Elements including orifice plates, carrier assemblies, metering runs, nozzles, Venturi tubes, Torbar averaging pitot tubes, Wedge meters and meters for subsea useComplete portfolio of secondary devices available including DP transmitters, temperature and Pressure Elements , flow computers and recording/control instrumentationDesigned to all the major standards including the latest ISO 5167-1:2003, API, R W Miller, AGA and ASMEOil and Gas Industry standard designs available for example, Shell, BP, Conoco, Esso, BOC designs and Industry/customer-specific paint designed to meet the demanding requirements of the Oil and Gas industriesExtensive range of non-destructive examination methods including hydrostatic Pressure testing, dye-penetrant, radiography and magnetic particle inspections (ASME VIII) and hardness survey (for example, Rockwell)Comprehensive certification and documentation available including PED 97/23/EC, material certificates ( , , NACE, etc.)

2 And comprehensive welder and weld procedure qualifications (ASME IX and BS EN 288/287) Differential Pressure Flow ElementsDS/DP EN Rev. E2 Total CapabilityAlthough it is over 100 years since the first DP devices wereused, they still form the largest installed base of all flowmeasurement loops, especially in the Process and Chemical/Oil/Gas has been supplying DP devices from their very beginningsin the 19th century and have unrivalled experience in the field,incorporating the expertise of Kent, Taylor and Bush engineers were involved in the design and manufacture ofsome of the first Venturi tubes to be used in the can offer a complete range of DP Flowmeters not only theprimary Elements but also the secondary transmitter and therecording/control/indication instrumentation that you ABB range of DP Primary Elements includes the followingdevices.

3 Venturi TubesWedge MetersAveraging Pitot Tubes (Torbar)Orifice PlatesSquare-edged, Conical-entry and Quarter CircleConcentric, Eccentric and SegmentalOrifice Carrier Ring AssembliesIntegral and Split-RingOrifice Flange AssembliesCompact Orifice Flow Meters (OriMaster)Meter RunsStandard and IntegralFlow NozzlesISA, Long Radius and ASME Throat-tapBasic Principle of OperationDP devices work on a principle based upon the Law ofConservation of Energy, where a restriction in the fluid pathcauses an acceleration in the fluid velocity and hence anincrease in kinetic energy. The gain in kinetic energy is at theexpense of Pressure energy and this is manifested as a drop influid Pressure across the narrowest part of the drop in Pressure and the flow rate are linked by the following(albeit simplified) relationship:Q = k hwhereQ= fluid flow rateThe DP generated for a given class of device depends on thebore of the restriction.

4 Many calculation standards exist but in allcases the Differential Pressure produced by the restriction islarger than would normally be expected. This effect is due to thefluid stream being unable to follow the contours of the restrictionperfectly and therefore having a flow stream whose narrowestdiameter (known as the Vena Contracta) is less than thediameter of the Vena Contracta increases the velocity and therefore thekinetic energy, that in turn gives a larger drop in Pressure thanwould normally be expected. Some of the Differential pressuregenerated is recovered downstream of the unit but all DPdevices incur some loss known as the 'irrecoverable pressureloss' and this is usually expressed as a percentage of thedifferential correct for the Vena Contracta effect, each device has aDischarge Coefficient that is a multiplying factor of less than 1and is part of the calculation.

5 Typically the smaller the VenaContracta compared with the bore of the device, the larger thedeviation from expectations and hence the smaller Head Loss, % of Area Ratio m = ( d )2 OrificeNozzleVenturi Contracta PPressure LossPDP and Vena ContractaComparative Pressure Lossesk = a constant for that dp deviceh = the Pressure difference across the restrictionDifferential Pressure Flow ElementsDS/DP EN Rev. E3 Units with a Vena Contracta diameter closer to that of the borehave a smaller deviation and hence a larger general, devices that control and guide the fluid in its path into,through and out of the element have coefficients nearer to unity( for a venturi tube).

6 Those with little or no conditioningof the fluid path have lower coefficients ( to for anorifice plate).Quality Products Backed-up WithComprehensive DocumentationABB offers unsurpassed quality in its DP devices and we alsoprovide the full testing and documentation that your applicationneeds. Whether the requirement is a single orifice plate with asimple Certificate of Conformity or a project requiring full materialinspection, traceability, third-party verification, calibration andcomprehensive data dossiers ABB can satisfy all of are just some of the standards we follow and the serviceswe can provide:Quality SystemsBS EN ISO 9001:2000Q 05907 Environmental ImpactISO 14001 EMS 40882EU Pressure Equipment Directive97/23/ECDesignBS EN ISO 5167-1.

7 2003R W MillerAPIASMEL W SpinkAGAM aterials and TraceabilityBS EN 10204 B,CNACE MR-01-75 Product Testing ServicesHydrostatic Pressure testingRadiography X-Ray/GammaMagnetic Particle InspectionDye-Penetrant InspectionUltrasonic examinationASME VIIIPMI (Texas Nuclear, Metascop)Flow CalibrationCustomer InspectionIndependent Third Party InspectionBase Metal TestingCharpy Impact testingHardness SurveyHIC TestingIntercrystalline Corrosion Testing to Your RequirementsBore CalculationsPED 97/23/ECCE MarkingMaterial Certificates to , MR-01-75 Conformity CertificateWelding Qualifications to ASME IX, EN BS 288/287GA DrawingsCertificate of ConformityWeight CertificatesNDT Certificates and ProceduresQuality PlanFull Data DossierInstallation and Operating Manuals Pressure Flow ElementsDS/DP EN Rev.

8 E4 Wedge Flowmeter (WMR)Venturi Tube (VTC)The classical Venturi tube is a robust, low Pressure -loss deviceand is available for line sizes 25 to 1200mm (1 to 48 in.) asstandard, with larger sizes available upon request. The metercan measure a wide range of clean liquids and gases. Smallersized units are machined from barstock or forged bar; largersizes are fabricated from rolled plate with forged can also offer full secondary systems with DP transmitters, Pressure transmitters, temperature transmitters and flowcomputers (see page 15).SpecificationAccuracyCalibratedwithi n at design flowrateUncalibratedtypically within at design flowratePressure loss5 to 12% of Differential head, dependent on the beta ratio(throat/pipe diameter ratio)Maximum working pressureDependent on the material selection and applicationMaximum working temperatureDependent on the material selection and applicationPipeline size range (standard)25 to 1200mm (1 to 48 in.)

9 Fittings for larger pipelines are available to special orderStandard materials and finishesCarbon steelBS1501-151-430A; ASTM A105N/ASTM A106 GRBS tainless steelBS 1502 316S31; ASTM A240 316;ASTM A182 F316; ASTM A312 TP 316 ABB can supply Venturi tubes in other materials and finishes tosuit particular applications. Advice given on receipt of applicationdetailsAll tubes are tested in accordance with the relevant code ofpractice or to customers' specific requirementsFlangesStandard sizes to suit Pressure rating and mating flangesTappings1/2 in. NPT as standard. Also available as 1/2 in. BSPT, 1/2 in. socketweld connection, 1/2 in.

10 NB Nipolet, 1/2 in. NB Nipoflanges, full range of applicable NDT, Documentation and Certification isavailable (see page 3)The simple design of ABB Wedge Flow Elements with theirV-shaped flow restriction makes them extremely robust and,when coupled with ABB s leading range of electronic pressuretransmitters, extremely ABB Wedge flowmeter is bi-directional and is particularlysuitable for fluids with high solid content, erosive/abrasive fluidsand high viscosity fluids. The smooth flow path has good self-cleaning characteristics and performance is not dependent onmaintaining sharp edge profiles.