BS EN ISO 5167-1-2003 Measurement of fluid flow by means of pressure differential devices inserted in circular cross-section conduits running full - General principles and requirem.pdf

1、BRITISH STANDARD BS EN ISO 5167-1:2003 Measurement of fluid flow by means of pressure differential devices inserted in circular cross-section conduits running full Part 1: General principles and requirements The European Standard EN ISO 5167-1:2003 has the status of a British Standard ICS 17.120.10

2、BS EN ISO 5167-1:2003 This British Standard was published under the authority of the Standards Policy and Strategy Committee on 18 March 2003 BSI 18 March 2003 ISBN 0 580 41457 4 National foreword This British Standard is the official English language version of EN ISO 5167-1:2003. It is identical w

3、ith ISO 5167-1:2003. It, together with Parts 2, 3 and 4 of BS EN ISO 5167:2003, supersedes BS EN ISO 5167-1:1997 which is withdrawn.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 Subcommittee CPI/30/2, Pressure d

4、ifferential 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 in the B

5、SI 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 responsible for

6、 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 UK inte

7、rests 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 33 and a

8、back cover. The BSI copyright date displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No. Date CommentsEUROPEANSTANDARD NORMEEUROPENNE EUROPISCHENORM ENISO51671 March2003 ICS17.120.10 SupersedesENISO51671:1995 Englishversion Measurementof

9、fluidflowbymeansofpressuredifferential devicesinsertedincircularcrosssectionconduitsrunningfull Part1:Generalprinciplesandrequirements(ISO51671:2003) Mesurededbitdesfluidesaumoyendappareils dprimognesinsrsdansdesconduitesenchargede sectioncirculairePartie1:Principesgnrauxet exigencesgnrales(ISO51671

10、:2003) DurchflussmessungvonFluidenmitDrosselgerteninvoll durchstrmtenLeitungenmitKreisquerschnittTeil1: AllgemeineGrundlagenundAnforderungen(ISO5167 1:2003) ThisEuropeanStandardwasapprovedbyCENon20February2003. CENmembersareboundtocomplywiththeCEN/CENELECInternalRegulationswhichstipulatethecondition

11、sforgivingthisEurope an Standardthestatusofanationalstandardwithoutanyalteration.Uptodatelistsandbibliographicalreferencesconcernings uchnational standardsmaybeobtainedonapplicationtotheManagementCentreortoanyCENmember. ThisEuropeanStandardexistsinthreeofficialversions(English,French,German).Aversio

12、ninanyotherlanguagemadebytra nslation undertheresponsibilityofaCENmemberintoitsownlanguageandnotifiedtotheManagementCentrehasthesamestatusasthe official versions. CENmembersarethenationalstandardsbodiesofAustria,Belgium,CzechRepublic,Denmark,Finland,France,Germany,Greece, Hungary,Iceland,Ireland,Ita

13、ly,Luxembourg,Malta,Netherlands,Norway,Portugal,SlovakRepublic,Spain,Sweden,Switzerland and UnitedKingdom. EUROPEANCOMMITTEEFORSTANDARDIZATION COMITEUROPENDENORMALISATION EUROPISCHESKOMITEEFRNORMUNG ManagementCentre:ruedeStassart,36B1050Brussels 2003CEN Allrightsofexploitationinanyformandbyanymeansr

14、eserved worldwideforCENnationalMembers. Ref.No.ENISO51671:2003EForeword Thisdocument(ENISO51671:2003)hasbeenpreparedbyTechnicalCommitteeISO/TC30 “Measurementoffluidflowinclosedconduits“incollaborationwithCMC. ThisEuropeanStandardshallbegiventhestatusofanationalstandard,eitherbypublicationof anidenti

15、caltextorbyendorsement,atthelatestbySeptember2003,andconflictingnational standardsshallbewithdrawnatthelatestbySeptember2003. ThisdocumentsupersedesENISO51671:1995. AccordingtotheCEN/CENELECInternalRegulations,thenationalstandardsorganizationsof thefollowingcountriesareboundtoimplementthisEuropeanSt

16、andard:Austria,Belgium,Czech Republic,Denmark,Finland,France,Germany,Greece,Hungary,Iceland,Ireland,Italy, Luxembourg,Malta,Netherlands,Norway,Portugal,SlovakRepublic,Spain,Sweden, SwitzerlandandtheUnitedKingdom. NOTEFROMCMC TheforewordissusceptibletobeamendedonreceptionoftheGerman languageversion.T

17、heconfirmedoramendedforeword,andwhenappropriate,thenormative annexZAforthereferencestointernationalpublicationswiththeirrelevantEuropean publicationswillbecirculatedwiththeGermanversion. Endorsementnotice ThetextofISO51671:2003hasbeenapprovedbyCENasENISO51671:2003withoutany modifications. ENISO51671

18、:2003 Reference number ISO 5167-1:2003(E)INTERNATIONAL STANDARD ISO 5167-1 Second edition 2003-03-01 Measurement of fluid flow by means of pressure differential devices inserted in circular cross-section conduits running full Part 1: General principles and requirements Mesure de dbit des fluides au

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24、oirypthgis.o gro We bwww.is.o groii ENISO51671:2003 iiiContents Page Foreword iv Introduction v 1 Scope 1 2 Normative references . 1 3 Terms and definitions. 1 4 Symbols and subscripts. 6 4.1 Symbols . 6 4.2 Subscripts 7 5 Principle of the method of measurement and computation. 7 5.1 Principle of th

25、e method of measurement . 7 5.2 Method of determination of the diameter ratio of the selected standard primary device . 8 5.3 Computation of flowrate. 8 5.4 Determination of density, pressure and temperature . 8 6 General requirements for the measurements 10 6.1 Primary device. 10 6.2 Nature of the

26、fluid . 11 6.3 Flow conditions. 11 7 Installation requirements . 11 7.1 General. 11 7.2 Minimum upstream and downstream straight lengths . 13 7.3 General requirement for flow conditions at the primary device 13 7.4 Flow conditioners (see also Annex C) 13 8 Uncertainties on the measurement of flowrat

27、e 16 8.1 Definition of uncertainty. 16 8.2 Practical computation of the uncertainty . 17 Annex A (informative) Iterative computations. 19 Annex B (informative) Examples of values of the pipe wall uniform equivalent roughness, k 21 Annex C (informative) Flow conditioners and flow straighteners. 22 Bi

28、bliography . 33 ENISO51671:2003iv 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 int

29、erested 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 Electrotechnic

30、al 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

31、technical 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.

32、ISO shall not be held responsible for identifying any or all such patent rights. ISO 5167-1 was prepared by Technical Committee ISO/TC 30, Measurement of fluid flow in closed conduits, Subcommittee SC 2, Pressure differential devices. This second edition of ISO 5167-1, together with the first editio

33、ns of ISO 5167-2, ISO 5167-3 and ISO 5167-4, cancels and replaces the first edition (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 dev

34、ices 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 ENISO51671:2003 vIntroduction ISO 5167, consisting of four parts, covers the geometry and method of use (install

35、ation 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 uncertainty. ISO 5167 is ap

36、plicable 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 used within specified l

37、imits 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 certain predictable limits of

38、 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; secondary devices 1)will be m

39、entioned only occasionally. ISO 5167 consists of the following four parts. a) This part 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 of ISO 5167. b) Part 2

40、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 the position of the pressu

41、re tappings. d) Part 4 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 in closed conduits Connecti

42、ons 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, which was succeeded by ISO in

43、1946. 4) In the USA the classical Venturi tube is sometimes called the Herschel Venturi tube. ENISO51671:2003INTENRATIONAL TSANDADR IS-7615 O1:(3002E)1Measurement of fluid flow by means of pressure differential devices inserted in circular cross-section conduits running full Part 1: General principl

44、es and requirements 1 Scope This part of ISO 5167 defines terms and symbols and establishes the general principles for methods of measurement and computation of the flowrate of fluid flowing in a conduit by means of pressure differential devices (orifice plates, nozzles and Venturi tubes) when they

45、are inserted into a circular cross-section conduit running full. This part of ISO 5167 also specifies the general requirements for methods of measurement, installation and determination of the uncertainty of the measurement of flowrate. It also defines the general specified limits of pipe size and R

46、eynolds number for which these pressure differential devices are to be used. ISO 5167 (all parts) is applicable only to flow that remains subsonic throughout the measuring section and where the fluid can be considered as single-phase. It is not applicable to the measurement of pulsating flow. 2 Norm

47、ative 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 of the referenced document (including any amendments) applies. ISO 4006:1991, Measurement of fl

48、uid flow in closed conduits Vocabulary and symbols ISO 5167-2:2003, Measurement of fluid flow by means of pressure differential devices inserted in circular cross-section conduits running full Part 2: Orifice plates ISO 5167-3:2003, Measurement of fluid flow by means of pressure differential devices inserted in