1、BRITISH STANDARD BS EN ISO 5167-4:2003 Incorporating Corrigendum No.1 Measurement of fluid flow by means of pressure differential devices inserted in circular cross-section conduits running full Part 4: Venturi tubes The European Standard EN ISO 5167-4:2003 has the status of a British Standard ICS 1
2、7.120.10 BS EN ISO 5167-4:2003 This British Standard was published under the authority of the Standards Policy and Strategy Committee on 18 March 2003 BSI 11 June 2003 ISBN 0 580 41454 X National foreword This British Standard is the official English language version of EN ISO 5167-4:2003. It is ide
3、ntical with ISO 5167-4:2003. It, together with Parts 1, 2 and 3 of BS EN ISO 5167:2003, supersedes BS EN ISO 5167-1:1997 which is withdrawn.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 Subcommittee CPI/30/2, Pr
4、essure 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 document may be found
5、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. Users are respons
6、ible 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 change, and keep the
7、 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 page, pages 1 to 2
8、4, 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 14518 Corrigendum No.1 11 June 2003 Correction to EN ISO foreword page and incorporating the Annex ZA page.
9、EUROPEANSTANDARD NORMEEUROPENNE EUROPISCHENORM ENISO51674 March2003 ICS17.120.10 SupersedesENISO51671:1995 Englishversion Measurementoffluidflowbymeansofpressuredifferential devicesinsertedincircularcrosssectionconduitsrunningfull Part4:Venturitubes(ISO51674:2003) Mesurededbitdesfluidesaumoyendappar
10、eils dprimognesinsrsdansdesconduitesenchargede sectioncirculairePartie4:TubesdeVenturi(ISO5167 4:2003) DurchflussmessungvonFluidenmitDrosselgerteninvoll durchstrmtenLeitungenmitKreisquerschnittTeil4: Venturirohre(ISO51674:2003) ThisEuropeanStandardwasapprovedbyCENon20February2003. CENmembersarebound
11、tocomplywiththeCEN/CENELECInternalRegulationswhichstipulatetheconditionsforgivingthisEurope an Standardthestatusofanationalstandardwithoutanyalteration.Uptodatelistsandbibliographicalreferencesconcernings uchnational standardsmaybeobtainedonapplicationtotheManagementCentreortoanyCENmember. ThisEurop
12、eanStandardexistsinthreeofficialversions(English,French,German).Aversioninanyotherlanguagemadebytra nslation undertheresponsibilityofaCENmemberintoitsownlanguageandnotifiedtotheManagementCentrehasthesamestatusasthe official versions. CENmembersarethenationalstandardsbodiesofAustria,Belgium,CzechRepu
13、blic,Denmark,Finland,France,Germany,Greece, Hungary,Iceland,Ireland,Italy,Luxembourg,Malta,Netherlands,Norway,Portugal,SlovakRepublic,Spain,Sweden,Switzerland and UnitedKingdom. EUROPEANCOMMITTEEFORSTANDARDIZATION COMITEUROPENDENORMALISATION EUROPISCHESKOMITEEFRNORMUNG ManagementCentre:ruedeStassart
14、,36B1050Brussels 2003CEN Allrightsofexploitationinanyformandbyanymeansreserved worldwideforCENnationalMembers. Ref.No.ENISO51674:2003ECORRECTED20030514 Foreword Thisdocument(ENISO51674:2003)hasbeenpreparedbyTechnicalCommitteeISO/TC30 “Measurementoffluidflowinclosedconduits“incollaborationwithCMC. Th
15、isEuropeanStandardshallbegiventhestatusofanationalstandard,eitherbypublicationof anidenticaltextorbyendorsement,atthelatestbySeptember2003,andconflictingnational standardsshallbewithdrawnatthelatestbySeptember2003. ThisdocumentsupersedesENISO51671:1995. AccordingtotheCEN/CENELECInternalRegulations,t
16、henationalstandardsorganizationsof thefollowingcountriesareboundtoimplementthisEuropeanStandard:Austria,Belgium,Czech Republic,Denmark,Finland,France,Germany,Greece,Hungary,Iceland,Ireland,Italy, Luxembourg,Malta,Netherlands,Norway,Portugal,Slovakia,Spain,Sweden,Switzerlandand theUnitedKingdom. Endo
17、rsementnotice ThetextofISO51674:2003hasbeenapprovedbyCENasENISO51674:2003withoutany modifications. NOTENormativereferencestoInternationalStandardsarelistedinAnnexZA(normative). ENISO51674:2003 Reference number ISO 5167-4:2003(E)INTERNATIONAL STANDARD ISO 5167-4 First edition 2003-03-01 Measurement o
18、f fluid flow by means of pressure differential devices inserted in circular cross-section conduits running full Part 4: Venturi tubes Mesure de dbit des fluides au moyen dappareils dprimognes insrs dans des conduites en charge de section circulaire Partie 4: Tubes de Venturi ENISO51674:2003IS-7615 O
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22、wo. ISO 3002 All irthgs erse.devr lnUeto sswrehise specified, on trap fo this lbupictaion maeb y cudorperro de tuilizi den yna form ro na ybm ynae,s lecetrinoc ro mceinahcla, incliduntohp gcoiypodna gn micrfoilm, wittuoh repmissii now nritign from ietI rehSa Ot tsserdda eh ebolw or ISOs memreb i ydo
23、bn the cnuotfo yr ttseuqer ehe.r ISO cirypothg fofice saCe tsopale 65 eneG 1121-HC 02 av leT. 4 + 10 947 22 1 11 xaF0 947 22 14 + 9 74 E-mial coirypthgis.o gro We bwww.is.o groii ENISO51674:2003 iiiContents Page Foreword iv Introduction v 1 Scope 1 2 Normative references . 2 3 Terms and definitions.
24、 2 4 Principles of the method of measurement and computation. 2 5 Classical Venturi tubes. 3 5.1 Field of application . 3 5.2 General shape . 3 5.3 Material and manufacture. 7 5.4 Pressure tappings. 7 5.5 Discharge coefficient, C . 8 5.6 Expansibility expansion factor, 9 5.7 Uncertainty of the disch
25、arge coefficient C. 10 5.8 Uncertainty of the expansibility expansion factor 10 5.9 Pressure loss. 10 6 Installation requirements . 11 6.1 General. 11 6.2 Minimum upstream and downstream straight lengths for installation between various fittings and the Venturi tube 11 6.3 Flow conditioners . 15 6.4
26、 Additional specific installation requirements for classical Venturi tubes 15 Annex A (informative) Table of expansibility expansion factor 17 Annex B (informative) Classical Venturi tubes used outside the scope of ISO 5167-4. 18 Annex C (informative) Pressure loss in a classical Venturi tube 22 Bib
27、liography . 24 ENISO51674:2003iv Foreword 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 inte
28、rested in a subject 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 Electrotechnica
29、l Commission (IEC) on 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 t
30、echnical committees 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. I
31、SO shall not be held responsible for identifying any or all such patent rights. ISO 5167-4 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 5167-4, together with the second edition
32、 of ISO 5167-1 and the first editions of ISO 5167-2 and ISO 5167-3, 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 p
33、ressure differential 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 ENISO51674:2003 vIntroduction ISO 5167, divided into four parts, covers the geometry and
34、 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 flowrate and its associated unce
35、rtainty. ISO 5167 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. Furthermore, each of these devices can only be
36、used within specified limits of pipe size and Reynolds number. ISO 5167 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 their results and coefficients to be given with certai
37、n 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 “secondary devices”. ISO 5167 covers primary devices; second
38、ary devices 1)will be mentioned only occasionally. ISO 5167 is divided into the following four parts. a) Part 1 of ISO 5167 gives general terms and definitions, symbols, principles and requirements as well as methods of measurement and uncertainty that are to be used in conjunction with Parts 2 to 4
39、 of ISO 5167. b) Part 2 of ISO 5167 specifies orifice plates, which can be used with corner pressure tappings, D and D/2 pressure tappings 2) , and flange pressure tappings. c) Part 3 of ISO 5167 specifies ISA 1932 nozzles 3) , long radius nozzles and Venturi nozzles, which differ in shape and in th
40、e position of the pressure tappings. d) This part of ISO 5167 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 regulations. 1) See ISO 2186:1973, Fluid flow
41、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 the National Standardizing Associations, w
42、hich was succeeded by ISO in 1946. 4) In the USA the classical Venturi tube is sometimes called the Herschel Venturi tube. ENISO51674:2003INTENRATIONAL TSANDADR IS-7615 O4:(3002E)1Measurement of fluid flow by means of pressure differential devices inserted in circular cross-section conduits running
43、full Part 4: Venturi tubes 1 Scope This part of ISO 5167 specifies the geometry and method of use (installation and operating conditions) of Venturi tubes when they are inserted in a conduit running full to determine the flowrate of the fluid flowing in the conduit. This part of ISO 5167 also provid
44、es 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 only to Venturi tubes in which the flow remains subsonic throughout the measuring section and where the fluid can be considered as si
45、ngle-phase. In addition, each of these devices can only be used within specified limits of pipe size, roughness, diameter ratio and Reynolds number. This part of ISO 5167 is not applicable to the measurement of pulsating flow. It does not cover the use of Venturi tubes in pipes sized less than 50 mm
46、 or more than 1 200 mm, or where the pipe Reynolds numbers are below 2 10 5 . This part of ISO 5167 deals with the three types of classical Venturi tubes: a) cast; b) machined; c) rough welded sheet-iron. A Venturi tube is a device which consists of a convergent inlet connected to a cylindrical thro
47、at which is in turn connected to a conical expanding section called the “divergent”. The differences between the values of the uncertainty of the discharge coefficient for the three types of classical Venturi tube show, on the one hand, the number of results available for each type of classical Vent
48、uri tube and, on the other hand, the more or less precise definition of the geometric profile. The values are based on data collected many years ago. Venturi nozzles (and other nozzles) are dealt with in ISO 5167-3. NOTE 1 Research into the use of Venturi tubes in high-pressure gas W 1 MPa ( W 10 bar) is being carried out at present (see Refe
