1、BRITISH STANDARD BS EN ISO 5167-3:2003 Incorporating Corrigendum No. 1 Measurement of fluid flow by means of pressure differential devices inserted in circular cross-section conduits running full Part 3: Nozzles and Venturi nozzles The European Standard EN ISO 5167-3:2003 has the status of a British
2、 Standard ICS 17.120.10 BS EN ISO 5167-3:2003 This British Standard was published under the authority of the Standards Policy and Strategy Committee on 18 March 2003 BSI 12 June 2003 ISBN 0 580 41455 8 National foreword This British Standard is the official English language version of EN ISO 5167-3:
3、2003. It is identical with ISO 5167-3:2003. It, together with Parts 1, 2 and 4 of BS EN ISO 5167:2003, supersedes BS EN ISO 5167-1:1997 which is withdrawn. The UK participation in its preparation was entrusted by Technical Committee CPI/30, Measurement of fluid flow in closed conduits, to Subcommitt
4、ee CPI/30/2, Pressure differential devices, which has the responsibility to: A list of organizations represented on this subcommittee can be obtained on request to its secretary. Cross-references The British Standards which implement international or European publications referred to in this documen
5、t may be found in the BSI Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standards Online. This publication does not purport to include all the necessary provisions of a contract. Us
6、ers are responsible for its correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for chang
7、e, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. Summary of pages This document comprises a front cover, an inside front cover, the EN ISO title page, the EN ISO foreword page, the ISO title page, pages ii to v, a blank pag
8、e, pages 1 to 30, the Annex ZA page and a back cover. The BSI copyright date displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No. Date Comments 14535 Corrigendum No. 1 12 June 2003 Correction to the EN ISO foreword page and addition of
9、the Annex ZA pageEUROPEANSTANDARD NORMEEUROPENNE EUROPISCHENORM ENISO51673 March2003 ICS17.120.10 SupersedesENISO51671:1995 Englishversion Measurementoffluidflowbymeansofpressuredifferential devicesinsertedincircularcrosssectionconduitsrunningfull Part3:NozzlesandVenturinozzles(ISO51673:2003) Mesure
10、dedbitdesfluidesaumoyendappareils dprimognesinsrsdansdesconduitesenchargede sectioncirculairePartie3:TuyresetVenturituyres (ISO51673:2003) DurchflussmessungvonFluidenmitDrosselgerteninvoll durchstrmtenLeitungenmitKreisquerschnittTeil3: DsenundVenturidsen(ISO51673:2003) ThisEuropeanStandardwasapprove
11、dbyCENon20February2003. CENmembersareboundtocomplywiththeCEN/CENELECInternalRegulationswhichstipulatetheconditionsforgivingthisEurope an Standardthestatusofanationalstandardwithoutanyalteration.Uptodatelistsandbibliographicalreferencesconcernings uchnational standardsmaybeobtainedonapplicationtotheM
12、anagementCentreortoanyCENmember. ThisEuropeanStandardexistsinthreeofficialversions(English,French,German).Aversioninanyotherlanguagemadebytra nslation undertheresponsibilityofaCENmemberintoitsownlanguageandnotifiedtotheManagementCentrehasthesamestatusasthe official versions. CENmembersarethenational
13、standardsbodiesofAustria,Belgium,CzechRepublic,Denmark,Finland,France,Germany,Greece, Hungary,Iceland,Ireland,Italy,Luxembourg,Malta,Netherlands,Norway,Portugal,SlovakRepublic,Spain,Sweden,Switzerland and UnitedKingdom. EUROPEANCOMMITTEEFORSTANDARDIZATION COMITEUROPENDENORMALISATION EUROPISCHESKOMIT
14、EEFRNORMUNG ManagementCentre:ruedeStassart,36B1050Brussels 2003CEN Allrightsofexploitationinanyformandbyanymeansreserved worldwideforCENnationalMembers. Ref.No.ENISO51673:2003ECORRECTED20030514 Foreword Thisdocument(ENISO51673:2003)hasbeenpreparedbyTechnicalCommitteeISO/TC30 “Measurementoffluidflowi
15、nclosedconduits“incollaborationwithCMC. ThisEuropeanStandardshallbegiventhestatusofanationalstandard,eitherbypublicationof anidenticaltextorbyendorsement,atthelatestbySeptember2003,andconflictingnational standardsshallbewithdrawnatthelatestbySeptember2003. ThisdocumentsupersedesENISO51671:1995. Acco
16、rdingtotheCEN/CENELECInternalRegulations,thenationalstandardsorganizationsof thefollowingcountriesareboundtoimplementthisEuropeanStandard:Austria,Belgium,Czech Republic,Denmark,Finland,France,Germany,Greece,Hungary,Iceland,Ireland,Italy, Luxembourg,Malta,Netherlands,Norway,Portugal,Slovakia,Spain,Sw
17、eden,Switzerlandand theUnitedKingdom. Endorsementnotice ThetextofISO51673:2003hasbeenapprovedbyCENasENISO51673:2003withoutany modifications. NOTENormativereferencestoInternationalStandardsarelistedinAnnexZA(normative). ENISO51673:2003 Reference number ISO 5167-3:2003(E)INTERNATIONAL STANDARD ISO 516
18、7-3 First edition 2003-03-01 Measurement of fluid flow by means of pressure differential devices inserted in circular-cross section conduits running full Part 3: Nozzles and Venturi nozzles Mesure de dbit des fluides au moyen dappareils dprimognes insrs dans des conduites en charge de section circul
19、aire Partie 3: Tuyres et Venturi-tuyres ENISO51673:2003ENISO51673:2003iiIS-7615 O3:(3002E) I SO 3002 All irhgts seredevr iiiContents Page Foreword iv Introduction v 1 Scope 1 2 Normative references . 2 3 Terms and definitions. 2 4 Principles of the method of measurement and computation. 2 5 Nozzles
20、and Venturi nozzles 3 5.1 ISA 1932 nozzle . 3 5.2 Long radius nozzles 9 5.3 Venturi nozzles 13 6 Installation requirements . 18 6.1 General. 18 6.2 Minimum upstream and downstream straight lengths for installation between various fittings and the primary device 18 6.3 Flow conditioners . 23 6.4 Circ
21、ularity and cylindricality of the pipe. 23 6.5 Location of primary device and carrier rings. 24 6.6 Method of fixing and gaskets 25 Annex A (informative) Tables of discharge coefficients and expansibility expansion factors 26 Bibliography . 30 ENISO51673:2003iiiIS-7615 O3:(3002E) vi I SO 3002 All ir
22、hgts seredevrForeword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject
23、for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) o
24、n all matters of electrotechnical standardization. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2. The main task of technical committees is to prepare International Standards. Draft International Standards adopted by the technical committees
25、are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO shall not be held
26、 responsible for identifying any or all such patent rights. ISO 5167-2 was prepared by Technical Committee ISO/TC 30, Measurement of fluid flow in closed conduits, Subcommittee SC 2, Pressure differential devices. This first edition of ISO 5167-3, together with the second edition of ISO 5167-1 and t
27、he first editions of ISO 5167-2 and ISO 5167-4, cancels and replaces the first edition of ISO 5167-1:1991, which has been technically revised, and ISO 5167-1:1991/Amd.1:1998. ISO 5167 consists of the following parts, under the general title Measurement of fluid flow by means of pressure differential
28、 devices inserted in circular-cross section conduits running full : Part 1: General principles and requirements Part 2: Orifice plates Part 3: Nozzles and Venturi nozzles Part 4:Venturi tubes ENISO51673:2003ivIS-7615 O3:(3002E) I SO 3002 All irhgts seredevr vIntroduction ISO 5167, consisting of four
29、 parts, covers the geometry and method of use (installation and operating conditions) of orifice plates, nozzles and Venturi tubes when they are inserted in a conduit running full to determine the flowrate of the fluid flowing in the conduit. It also gives necessary information for calculating the f
30、lowrate and its associated uncertainty. ISO 5167 (all parts) is applicable only to pressure differential devices in which the flow remains subsonic throughout the measuring section and where the fluid can be considered as single-phase, but is not applicable to the measurement of pulsating flow. Furt
31、hermore, each of these devices can only be used within specified limits of pipe size and Reynolds number. ISO 5167 (all parts) deals with devices for which direct calibration experiments have been made, sufficient in number, spread and quality to enable coherent systems of application to be based on
32、 their results and coefficients to be given with certain predictable limits of uncertainty. The devices introduced into the pipe are called “primary devices”. The term primary device also includes the pressure tappings. All other instruments or devices required for the measurement are known as “seco
33、ndary devices”. ISO 5167 (all parts) covers primary devices; secondary devices 1)will be mentioned only occasionally. ISO 5167 consists of the following four parts. a) ISO 5167-1 gives general terms and definitions, symbols, principles and requirements as well as methods of measurement and uncertain
34、ty that are to be used in conjunction with ISO 5167-2, ISO 5167-3 and ISO 5167-4. b) ISO 5167-2 specifies orifice plates, which can be used with corner pressure tappings, D and D/2 pressure tappings 2) , and flange pressure tappings. c) ISO 5167-3 specifies ISA 1932 nozzles 3) , long radius nozzles
35、and Venturi nozzles, which differ in shape and in the position of the pressure tappings. d) ISO 5167-4 specifies classical Venturi tubes 4) . Aspects of safety are not dealt with in Parts 1 to 4 of ISO 5167. It is the responsibility of the user to ensure that the system meets applicable safety regul
36、ations. _ 1) See ISO 2186:1973, Fluid flow in closed conduits Connections for pressure signal transmissions between primary and secondary elements. 2) Orifice plates with “vena contracta” pressure tappings are not considered in ISO 5167. 3) ISA is the abbreviation for the International Federation of
37、 the National Standardizing Associations, which was succeeded by ISO in 1946. 4) In the USA the classical Venturi tube is sometimes called the Herschel Venturi tube. ENISO51673:2003vINTENRATIONAL TSANDADR IS-7615 O3:(3002E)I SO 3002 All irhgts seredevr 1Measurement of fluid flow by means of pressure
38、 differential devices inserted in circular-cross section conduits running full Part 3: Nozzles and Venturi nozzles 1 Scope This part of ISO 5167 specifies the geometry and method of use (installation and operating conditions) of nozzles and Venturi nozzles when they are inserted in a conduit running
39、 full to determine the flowrate of the fluid flowing in the conduit. This part of ISO 5167 also provides background information for calculating the flowrate and is applicable in conjunction with the requirements given in ISO 5167-1. This part of ISO 5167 is applicable to nozzles and Venturi nozzles
40、in which the flow remains subsonic throughout the measuring section and where the fluid can be considered as single-phase. In addition, each of the devices can only be used within specified limits of pipe size and Reynolds number. It is not applicable to the measurement of pulsating flow. It does no
41、t cover the use of nozzles and Venturi nozzles in pipe sizes less than 50 mm or more than 630 mm, or where the pipe Reynolds numbers are below 10 000. This part of ISO 5167 deals with a) two types of standard nozzles: 1) the ISA 5)1932 nozzle; 2) the long radius nozzle 6) ; b) the Venturi nozzle. Th
42、e two types of standard nozzle are fundamentally different and are described separately in this part of ISO 5167. The Venturi nozzle has the same upstream face as the ISA 1932 nozzle, but has a divergent section and, therefore, a different location for the downstream pressure tappings, and is descri
43、bed separately. This design has a lower pressure loss than a similar nozzle. For both of these nozzles and for the Venturi nozzle direct calibration experiments have been made, sufficient in number, spread and quality to enable coherent systems of application to be based on their results and coeffic
44、ients to be given with certain predictable limits of uncertainty. _ 5) ISA is the abbreviation for the International Federation of the National Standardizing Associations, which was superseded by ISO in 1946. 6) The long radius nozzle differs from the ISA 1932 nozzle in shape and in the position of
45、the pressure tappings. ENISO51673:20031IS-7615 O3:(3002E) 2 I SO 3002 All irhgts seredevr2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition
46、of the referenced document (including any amendments) applies. ISO 4006:1991, Measurement of fluid flow in closed conduits Vocabulary and symbols ISO 5167-1:2003, Measurement of fluid flow by means of pressure differential devices inserted in circular cross- section conduits running full Part 1: Gen
47、eral principles and requirements 3 Terms and definitions For the purposes of this document, the terms and definitions given in ISO 4006 and ISO 5167-1 apply. 4 Principles of the method of measurement and computation The principle of the method of measurement is based on the installation of a nozzle or a Venturi nozzle into a pipeline in which a fluid is running full. The installation of the primary device causes a static pressure difference between the upstream side and the throat. The flowrate can be determined from the measured value of this pressure difference and from
