NF EN ISO 5167-2

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SAGAWEB Pour : TECHNIP FRANCE le 20/1/2004 - 9:49 © AFNOR 2003 AFNOR 2003 1 st issue 2003-06-P © AFNOR 2003 — All rights reserved FE116889 ISSN 0335-3931 NF EN ISO 5167-2 June 2003 Classification index: X 10-102-2 European standard French standard Published and distributed by Association Française de Normalisation (AFNOR — French standard institute) — 11, avenue Francis de Pressensé — 93571 Saint-Denis La Plaine Cedex — Tel.: + 33 (0)1 41 62 80 00 — Fax: + 33 (0)1 49 17 90 00 — www.afnor.fr ICS: 17.120.10 Measurement of fluid flow by means of pressure differential devices inserted in circular-cross section conduits running full Part 2: Orifice plates F : Mesure de débit des fluides au moyen d'appareils déprimogènes insérés dans des conduites en charge de section circulaire — Partie 2 : Diaphragmes D : Durchflussmessung von Fluiden mit Drosselgeräten in voll durchströmten Leitungen mit Kreisquerschnitt — Teil 2: Blenden French standard approved by decision of the Director General of AFNOR on May 20, 2003 taking effect on June 20, 2003. With parts 1, 3 and 4, this standard replaces the approved standard NF EN ISO 5167-1, dated November 1995, and its amendment A1, dated October 1998. Correspondence The European Standard EN ISO 5167-2:2003 has the status of French standard. It reproduces in full the international standard ISO 5167-2:2003. Analysis One of the X 10-1 . set of standards concerning the measurement of fluid flow in closed conduits, this document specifies information on orifice plates. It shall be used with part 1 of the standard (NF EN ISO 5167-1) that provides: — general information concerning the measurement of fluid flow using pressure dif- ferential devices; — information relating to the calculation of flow and uncertainty of associated measurements. Descriptors Technical International Thesaurus: flow measurement, fluid flow, pipe flow, orifice flowmeters, diaphragms (mechanics), measurement, expansibility factor, computa- tion, uncertainty, installation. Modifications This document constitutes a technical revision with respect to the document replaced. Corrections SAGAWEB pour : TECHNIP FRANCE le 20/1/2004 - 9:49 NF EN ISO 5167-2:2003 — 2 — National foreword References to French standards The correspondence between the standards figuring in the clause "Normative references" and the identical French standards is as follows: ISO 4006 : NF ISO 4006 (classification index: X 10-100) ISO 5167-1 : NF EN ISO 5167-1 (classification index: X 10-102-1) SAGAWEB pour : TECHNIP FRANCE le 20/1/2004 - 9:49 EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM EN ISO 5167-2 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 2: Orifice plates (ISO 5167-2:2003) Mesure de débit des fluides au moyen d'appareils déprimogènes insérés dans des conduites en charge de section circulaire - Partie 2: Diaphragmes (ISO 5167- 2:2003) Durchflussmessung von Fluiden mit Drosselgeräten in voll durchströmten Leitungen mit Kreisquerschnitt - Teil 2: Blenden (ISO 5167-2:2003) 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 5167-2:2003 E SAGAWEB pour : TECHNIP FRANCE le 20/1/2004 - 9:49 EN ISO 5167-2:2003 (E) 2 Foreword This document (EN ISO 5167-2:2003) 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 5167-2:2003 has been approved by CEN as EN ISO 5167-2:2003 without any modifications. SAGAWEB pour : TECHNIP FRANCE le 20/1/2004 - 9:49 ISO 5167-2:2003(E) © ISO 2003 — All rights reserved iii Contents Page Foreword iv Introduction v 1 Scope 1 2 Normative references . 1 3 Terms, definitions and symbols 1 4 Principles of the method of measurement and computation . 2 5 Orifice plates . 2 5.1 Description . 2 5.2 Pressure tappings . 6 5.3 Coefficients and corresponding uncertainties of orifice plates . 10 5.4 Pressure loss, ∆ ϖ 13 6 Installation requirements . 15 6.1 General . 15 6.2 Minimum upstream and downstream straight lengths for installation between various fittings and the orifice plate . 15 6.3 Flow conditioners . 20 6.4 Circularity and cylindricality of the pipe . 26 6.5 Location of orifice plate and carrier rings 27 6.6 Method of fixing and gaskets 28 Annex A (informative) Tables of discharge coefficients and expansibility [expansion] factors 29 Annex B (informative) Flow conditioners . 41 Bibliography . 46 SAGAWEB pour : TECHNIP FRANCE le 20/1/2004 - 9:49 ISO 5167-2:2003(E) iv © ISO 2003 — All rights reserved 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 5167-2 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 5167-2, together with the second edition of ISO 5167-1 and the first editions of ISO 5167-3 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 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 SAGAWEB pour : TECHNIP FRANCE le 20/1/2004 - 9:49 ISO 5167-2:2003(E) © ISO 2003 — All rights reserved 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 (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. Furthermore, 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 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 (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 uncertainty 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 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 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. SAGAWEB pour : TECHNIP FRANCE le 20/1/2004 - 9:49 SAGAWEB pour : TECHNIP FRANCE le 20/1/2004 - 9:49 INTERNATIONAL STANDARD ISO 5167-2:2003(E) © ISO 2003 — All rights reserved 1 Measurement of fluid flow by means of pressure differential devices inserted in circular-cross section conduits running full — Part 2: Orifice plates 1 Scope This part of ISO 5167 specifies the geometry and method of use (installation and operating conditions) of orifice plates 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 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 primary devices having an orifice plate used with flange pressure tappings, or with corner pressure tappings, or with D and D/2 pressure tappings. Other pressure tappings such as “vena contracta” and pipe tappings have been used with orifice plates but are not covered by this part of ISO 5167. This part of ISO 5167 is applicable only to a flow which 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. It does not cover the use of orifice plates in pipe sizes less than 50 mm or more than 1 000 mm, or for pipe Reynolds numbers below 5 000. 2 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 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: General principles and requirements 3 Terms, definitions and symbols For the purposes of this document, the terms, definitions and symbols given in ISO 4006 and ISO 5167-1 apply. SAGAWEB pour : TECHNIP FRANCE le 20/1/2004 - 9:49 [...]... 90° bend Two 90° bends in any plane (S > 30D) a 1 Two 90° bends in the same plane: S-configuration (30D W S > 10D) a 2 Two 90° bends in the same plane: S-configuration (10D W S) a 3 Two 90° bends in perpendicular planes (30D W S W 5D) a Two 90° bends in perpendicular planes (5D > S) a, b Single 90° tee with or without an extension Mitre 90° bend Single 45° bend Two 45° bends in the same plane: S-configuration... system 14 © ISO 2003 — All rights reserved SAGAWEB pour : TECHNIP FRANCE le 20/1/2004 - 9:49 ISO 5167-2: 2003(E) 6 Installation requirements 6.1 General General installation requirements for pressure differential devices are given in Clause 7 of ISO 5167-1:— and should be followed in conjunction with the additional specific requirements for orifice plates given in this clause The general requirements for... orifice plate where sufficient straight length to achieve the desired level of uncertainty is not available Downstream of a header the use of a flow conditioner is strongly recommended Many of the lengths given in 6.2 and all lengths given in 6.3.2 are based on data included in Reference [8] of the Bibliography Additional work which contributed to the lengths in 6.2 is given in References [9] and [10] 6.2... of swirl d) When the second (or more distant) fitting from the orifice is a combination of bends, then in applying Table 3 the separation between the bends is calculated as a multiple of the diameter of the bends themselves © ISO 2003 — All rights reserved 17 SAGAWEB pour : TECHNIP FRANCE le 20/1/2004 - 9:49 ISO 5167-2: 2003(E) Key 1 expander 2 3 full bore ball valve or gate valve fully open orifice plate... orifice plate is two bends in perpendicular planes (the separation between the bends is 10 times the diameter of the bends) and the orifice plate has diameter ratio 0,4 6.2.9.1 If the first fitting is a full bore ball valve fully open [see Figure 7 a)], the distance between the valve and the orifice plate shall be at least 12D (from Table 3) and that between the two bends in perpendicular planes and... for which the volume is stated As will be seen later in this part of ISO 5167, the coefficient of discharge, C, is dependent on the Reynolds number, Re, which is itself dependent on qm, and has to be obtained by iteration (see Annex A of ISO 5167-1:2003 for guidance regarding the choice of the iteration procedure and initial estimates) The diameters d and D mentioned in the formula are the values of... primary device are given in 7.3 of ISO 5167-1:— The requirements for use of a flow conditioner are given in 7.4 of ISO 5167-1:— For some commonly used fittings, as specified in Table 3, the minimum straight lengths of pipe indicated may be used and detailed requirements are given in 6.2 However, a flow conditioner as specified in 6.3 will permit the use of a shorter upstream pipe length; moreover, a flow... and vapours of which the isentropic exponent is known Nonetheless, Equation (5) is applicable only if p2/p1 W 0,75 Values of the expansibility [expansion] factor as a function of the isentropic exponent, the pressure ratio and the diameter ratio are given for convenience in Table A.12 These values are not intended for precise interpolation Extrapolation is not permitted 12 © ISO 2003 — All rights reserved... two bends in perpendicular planes to the orifice plate [see Figure 7 b)] 6.2.9.2 If the first fitting is a reducer from 2D to D over a length of 2D [see Figure 7 c)], the distance between the reducer and the orifice plate shall be at least 5D (from Table 3) and that between the two bends in perpendicular planes and the reducer shall be at least 22 × 2D [from 6.2.8 a)]; the distance between the two bends... © ISO 2003 — All rights reserved 19 SAGAWEB pour : TECHNIP FRANCE le 20/1/2004 - 9:49 ISO 5167-2: 2003(E) 6.3 Flow conditioners 6.3.1 General A flow conditioner can be used to reduce upstream straight lengths either through meeting the compliance test given in 7.4.1 of ISO 5167-1:2003, in which case it can be used downstream of any upstream fitting, or through meeting the requirements of 7.4.2 of ISO . No. EN ISO 5167-2: 2003 E SAGAWEB pour : TECHNIP FRANCE le 20/1/2004 - 9:49 EN ISO 5167-2: 2003 (E) 2 Foreword This document (EN ISO 5167-2: 2003) has been. approved standard NF EN ISO 5167-1, dated November 1995, and its amendment A1, dated October 1998. Correspondence The European Standard EN ISO 5167-2: 2003 has