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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 12&23<,1*:,7+287%6,3(50,66,21(;&(37$63(50,77(‘%<&23<5,*+7/$: Copyright British Standards Institution Provided by IHS under license with BSI Not for ResaleNo reproduction or networking permitted without license from IHS –`,`,-`-`,,`,,`,`,,`— 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 with 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 It, together with Parts 2, 3 and 4 of BS EN ISO 5167:2003, supersedes BS EN ISO 5167-1:1997 which is withdrawn.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 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 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 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 change, 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 page, pages 1 to 33 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 Copyright British Standards Institution Provided by IHS under license with BSI Not for ResaleNo reproduction or networking permitted without license from IHS –`,`,-`-`,,`,,`,`,,`— EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM EN ISO 5167-1 March 2003 ICS 17.120.10 Supersedes EN ISO 5167-1:1995 English version Measurement of fluid flow by means of pressure differential devices inserted in circular cross-section conduits running full Part 1: General principles and requirements (ISO 5167-1:2003) Mesure de débit des fluides au moyen d’appareils déprimogènes insérés dans des conduites en charge de section circulaire Partie 1: Principes généraux et exigences générales (ISO 5167-1:2003) Durchflussmessung von Fluiden mit Drosselgeräten in voll durchströmten Leitungen mit Kreisquerschnitt Teil 1: Allgemeine Grundlagen und Anforderungen (ISO 5167- 1:2003) This European Standard was approved by CEN on 20 February 2003. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Management Centre or to any CEN member. This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the Management Centre has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Slovak Republic, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG Management Centre: rue de Stassart, 36 B-1050 Brussels © 2003 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN ISO 5167-1:2003 E Copyright British Standards Institution Provided by IHS under license with BSI Not for ResaleNo reproduction or networking permitted without license from IHS –`,`,-`-`,,`,,`,`,,`— Foreword This document (EN ISO 5167-1:2003) has been prepared by Technical Committee ISO/TC 30 “Measurement of fluid flow in closed conduits” in collaboration with CMC. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by September 2003, and conflicting national standards shall be withdrawn at the latest by September 2003. This document supersedes EN ISO 5167-1:1995. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Slovak Republic, Spain, Sweden, Switzerland and the United Kingdom. NOTE FROM CMC The foreword is susceptible to be amended on reception of the German language version. The confirmed or amended foreword, and when appropriate, the normative annex ZA for the references to international publications with their relevant European publications will be circulated with the German version. Endorsement notice The text of ISO 5167-1:2003 has been approved by CEN as EN ISO 5167-1:2003 without any modifications. EN ISO 5167−1:2003 Copyright British Standards Institution Provided by IHS under license with BSI Not for ResaleNo reproduction or networking permitted without license from IHS –`,`,-`-`,,`,,`,`,,`— Reference numbe r 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 débit des fluides au moyen d’appareils déprimogènes insérés dans des conduites en charge de section circulaire — Partie 1: Principes généraux et exigences générales EN ISO 5167−1:2003 Copyright British Standards Institution Provided by IHS under license with BSI Not for ResaleNo reproduction or networking permitted without license from IHS –`,`,-`-`,,`,,`,`,,`— IS-7615 O1:(3002E) DPlcsid Fremia ihTs PDF file mya ctnoian emdebt dedyfepcaes. 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In tlnu ehikletneve y ttah lborp aem lertait gno it is f,dnuo plsaee ifnrom ttneC ehlar Secterirata ta teh serddaig sleb nevwo. © 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 IS’Os memreb i ydobn 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 coirypthgi@s.o gro We bwww.is.o gro ii EN ISO 5167−1:2003 Copyright British Standards Institution Provided by IHS under license with BSI Not for ResaleNo reproduction or networking permitted without license from IHS –`,`,-`-`,,`,,`,`,,`— iii Contents 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 the 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 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 flowrate 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 Bibliography . 33 EN ISO 5167−1:2003 Copyright British Standards Institution Provided by IHS under license with BSI Not for ResaleNo reproduction or networking permitted without license from IHS –`,`,-`-`,,`,,`,`,,`— iv 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 interested 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 Electrotechnical 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 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. 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 editions 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 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 EN ISO 5167−1:2003 Copyright British Standards Institution Provided by IHS under license with BSI Not for ResaleNo reproduction or networking permitted without license from IHS –`,`,-`-`,,`,,`,`,,`— v Introduction ISO 5167, consisting of four 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 flowrate and its associated uncertainty. 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 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 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 “secondary devices”. ISO 5167 covers primary devices; secondary devices 1) will be mentioned 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 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 pressure 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 — 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, which was succeeded by ISO in 1946. 4) In the USA the classical Venturi tube is sometimes called the Herschel Venturi tube. EN ISO 5167−1:2003 Copyright British Standards Institution Provided by IHS under license with BSI Not for ResaleNo reproduction or networking permitted without license from IHS –`,`,-`-`,,`,,`,`,,`— Copyright British Standards Institution Provided by IHS under license with BSI Not for ResaleNo reproduction or networking permitted without license from IHS –`,`,-`-`,,`,,`,`,,`— […]… calibration has been carried out and that the conditions of use are the same (see ISO 516 7-2 , ISO 516 7-3 or ISO 516 7-4 ) `,` ,-` -` ,,`,,`,`,,` Copyright British Standards Institution Provided by IHS under license with BSI No reproduction or networking permitted without license from IHS 7 Not for Resale EN ISO 5167−1:2003 The mass flowrate can be determined, since it is related to the differential pressure… not lead to any distortion of the differential pressure measurement a Flow b Section A-A (upstream) also typical for section B-B (downstream) `,` ,-` -` ,,`,,`,`,,` Figure 1 — “Triple-T” arrangement Copyright British Standards Institution Provided by IHS under license with BSI No reproduction or networking permitted without license from IHS 9 Not for Resale EN ISO 5167−1:2003 5.4.4 Temperature 5.4.4.1… and 5.3.3.1 of ISO 516 7-2 :2003 for an orifice plate;  5.1.6.2 and 5.1.7.1 of ISO 516 7-3 :2003 for an ISA 1932 nozzle;  5.2.6.2 and 5.2.7.1 of ISO 516 7-3 :2003 for a long radius nozzle;  5.3.4.2 and 5.3.5.1 of ISO 516 7-3 :2003 for a Venturi nozzle;  5.5.2 and 5.7.1 of ISO 516 7-4 :2003 for a Venturi tube with an “as cast” convergent section;  5.5.3 and 5.7.2 of ISO 516 7-4 :2003 for a Venturi tube with… convergent section; or  5.5.4 and 5.7.3 of ISO 516 7-4 :2003 for a Venturi tube with a rough-welded sheet-iron convergent section For these tests, the test facility should first remove swirl and then have a sufficient length upstream of the primary device For an orifice plate 70D length would be sufficient `,` ,-` -` ,,`,,`,`,,` 7.4.1.5 If the flow conditioner is to be acceptable at any Reynolds number then… providing a level of confidence of approximately 95 %, the user-determined uncertainties shall also be obtained to provide a level of confidence of approximately 95 % `,` ,-` -` ,,`,,`,`,,` 18 Copyright British Standards Institution Provided by IHS under license with BSI No reproduction or networking permitted without license from IHS Not for Resale EN ISO 5167−1:2003 `,` ,-` -` ,,`,,`,`,,` Annex A (informative)… 6 of ISO 516 7-2 :2003, ISO 516 7-3 :2003, or ISO 516 7-4 :2003, as appropriate, for particular primary devices Copyright British Standards Institution Provided by IHS under license with BSI No reproduction or networking permitted without license from IHS 11 Not for Resale EN ISO 5167−1:2003 The pipe is considered to be straight when the deviation from a straight line does not exceed 0,4 % over its length… possible because experiments show that ε is practically independent of the Reynolds number and, for a given diameter ratio of a given primary device, ε only depends on the pressure ratio and the isentropic exponent Copyright British Standards Institution Provided by IHS under license with BSI No reproduction or networking permitted without license from IHS 5 Not for Resale EN ISO 5167−1:2003 The numerical.. .EN ISO 5167−1:2003 INTENRATIONAL TSANDADR IS-7615 O1:(3002E) Measurement of fluid flow by means of pressure differential devices inserted in circular cross-section conduits running full — Part 1: General principles and requirements 1 Scope `,` ,-` -` ,,`,,`,`,,` This part of ISO 5167 defines terms and symbols and establishes the general principles for methods of measurement and computation… applies For undated references, the latest edition of the referenced document (including any amendments) applies ISO 4006:1991, Measurement of fluid flow in closed conduits — Vocabulary and symbols ISO 516 7-2 :2003, Measurement of fluid flow by means of pressure differential devices inserted in circular cross-section conduits running full — Part 2: Orifice plates ISO 516 7-3 :2003, Measurement of fluid flow… [the 19-tube bundle flow straightener (1998)] is described in more detail in 6.3.2 of ISO 516 7-2 :2003 22 Copyright British Standards Institution Provided by IHS under license with BSI No reproduction or networking permitted without license from IHS Not for Resale `,` ,-` -` ,,`,,`,`,,` C.2.2.1 EN ISO 5167−1:2003 Key 1 minimized gap 2 3 pipe wall tube wall thickness (which is less than 0,025D) 4 centring . license from IHS — `,` ,-` -` ,,`,,`,`,, `– – Foreword This document (EN ISO 516 7-1 :2003) has been prepared by Technical Committee ISO/ TC 30 “Measurement. — `,` ,-` -` ,,`,,`,`,, `– – EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM EN ISO 516 7-1 March 2003 ICS 17.120.10 Supersedes EN ISO 516 7-1 :1995 English

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