BS-EN-12480-2002.pdf

BRITISH STANDARD BS EN 12480:2002 Incorporating Amendment No. 1 Gas meters Rotary displacement gas meters The European Standard EN 12480:2002, with the incorporation of Amendment A1:2006, has the status of a British Standard ICS 91.140.40 ? Licensed Copy: sheffieldun sheffieldun, na, Sat Oct 28 11:41:30 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN 12480:2002 This British Standard, having been prepared under thedirection of the Engineering Sector Polic and Strategy Committee, was published under the authority of the Standards Policy and Strategy Committee 18 March 2002 © BSI 2006 ISBN 0 580 39274 0 National foreword This British Standard is the official English language version of EN 12480:2002, including amendment A1:2006. It partially supersedes BS 4161-6:1987 which will be withdrawn once BS EN 12261:2002 is published. The start and finish of text introduced or altered by amendment is indicated in the text by tags !“. Tags indicating changes to CEN text carry the number of the CEN amendment. For example, text altered by CEN amendment A1 is indicated by !“. The UK participation in its preparation was entrusted to Technical Committee GSE/25, Gas meters, which has the responsibility to: A list of organizations represented on this committee 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 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 title page, pages 2 to 45 and a back cover. The BSI copyright notice displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No. DateComments 1645631 July 2006See national foreword Licensed Copy: sheffieldun sheffieldun, na, Sat Oct 28 11:41:30 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EUROPEANSTANDARD NORMEEUROPÉENNE EUROPÄISCHENORM EN12480 February 2002 ICS 91.140.40 English version Gas meters - Rotary displacement gas meters Compteurs de gaz - Compteurs de gaz à déplacement rotatifs Gaszähler - Drehkolbengaszähler This European Standard was approved by CEN on 16 November 2001. 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, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, 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 © 2002 CENAll rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 12480:2002 E + A1 May 2006 Licensed Copy: sheffieldun sheffieldun, na, Sat Oct 28 11:41:30 GMT+00:00 2006, Uncontrolled Copy, (c) BSI 2 Contents page Foreword4 1SCOPE.5 2NORMATIVE REFERENCES5 3TERMINOLOGY 3.1Terms and definitions. 3.2Symbols8 4WORKING RANGE .9 4.1General9 4.2Flowrate range9 4.3Pressure range.9 4.4Temperature range 10 5METROLOGICAL PERFORMANCE.10 5.1Error of indication10 5.1.1Requirements.10 5.2Pressure loss12 5.2.1Requirements.12 5.3Metrological repeatability12 5.3.1Requirements.12 6.1General12 6.2Material12 6.2.1General12 6.2.2Resistance to external corrosion.13 6.2.3Penetration resistance 13 6.2.4Adhesion of the protective coating14 6.3Robustness.14 6.3.1Resistance to internal pressure .14 6.3.2Rate of change of pressure.15 6.3.3External leak tightness15 6.3.4Temperature .16 6.3.5Overload17 6.3.6Bending and torsional moment17 6.4Connections .19 6.5Pressure and temperature tappings 24 6.5.1Pressure tappings24 6.5.2Temperature tappings .25 7METER OUTPUT.25 7.1Index25 7.1.1General25 7.1.2Magnetic coupling .26 7.1.3Mechanical indicating device .26 7.1.4Test element.26 7.2Index window .27 7.2.1General27 7.2.2Requirements.27 7.2.3Tests27 6.6 Resistance to high temperature (optional).25 6.3.7 Transportation and storage19 6 DESIGN AND MANUFACTURING.12 5.1.2 Test .11 5.3.2 Test .12 6 6 EN 12480:2002 (E) 5.2.2 Test .12 Licensed Copy: sheffieldun sheffieldun, na, Sat Oct 28 11:41:30 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 12480:2002 (E) 3 7.4.1General30 7.4.2Specification for low frequency pulse generator.30 7.4.3Specification for high frequency pulse generator31 7.4.4Electrical Connection31 8DURABILITY.31 8.1Requirements.31 8.2Tests31 9MARKING32 9.1General32 9.2Direction of flow32 9.3Pressure tappings32 9.4Durability and legibility of marking32 9.4.1Requirements.32 9.4.2Indelibility test32 Annex A (normative) Pattern approval tests Annex B (normative)Individual meter testing . Annex C (normative)Resistance to high temperature (optional) . C.1Requirements C.2Test C.2.1Apparatus . C.2.2Test conditions . C.2.3Test procedure. C.3Marking. Bibliography Annex ZA (informative) Relationship between this European Standard and the Essential Requirements of EU Directive 2004/22 Measuring Instruments Directive 10 DOCUMENTATION.33 10.1 General .33 10.2 Declaration of conformity.33 10.3 Instruction manual 33 7.3 Output drive shafts28 7.3.1 Requirements.28 7.3.2 Tests .29 7.4 Pulse generators .30 34 36 37 37 37 37 37 38 39 41 44 EN 12480:2002 (E) Licensed Copy: sheffieldun sheffieldun, na, Sat Oct 28 11:41:30 GMT+00:00 2006, Uncontrolled Copy, (c) BSI 4 Foreword This European Standard has been prepared by Technical Committee CEN/TC 237 “Gas meters“, the secretariat of which is held by BSI. 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 August 2002, and conflicting national standards shall be withdrawn at the latest by August 2002. In the preparation of this European Standard, the content of OIML Publication, “International Recommendations 6” and “International Recommendations 32” and the content of member bodies national standards on rotary displacement gas meters have been taken into account. Annexes A, B and C are normative. This standard includes a Bibliography. 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, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom. Foreword to amendment A1 This document (EN 12480:2002/A1:2006) has been prepared by Technical Committee CEN/TC 237 “Gas meters”, the secretariat of which is held by BSI. This Amendment to the European Standard EN 12480:2002 shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by November 2006, and conflicting national standards shall be withdrawn at the latest by November 2006. This document has been prepared under a mandate given to CEN by the European Commission and the European Free Trade Association, and supports essential requirements of EU Directive 2004/22, Measuring Instruments Directive (MID). For relationship with EU Directive, see informative Annex ZA, which is an integral part of this document. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. EN 12480:2002 (E) Licensed Copy: sheffieldun sheffieldun, na, Sat Oct 28 11:41:30 GMT+00:00 2006, Uncontrolled Copy, (c) BSI 5 1SCOPE This European Standard specifies ranges, construction, performances, output characteristics and testing of rotary displacement gas meters (hereinafter referred to as RD meters or simply meters) for gas volume measurement. This European Standard applies to rotary displacement gas meters used to measure the volume of fuel gases of the 1st, 2ndand 3rdgas families, the composition of which is specified in EN 437, at a maximum working pressure up to and including16 bar over a gas temperature range of at least 10 °C to + 40 °C. 2NORMATIVE REFERENCES This European Standard incorporates by dated or undated references provisions from other publications. These normative references are cited at the appropriate places in the text, and the publications are listed hereafter. For dated references, subsequent amendments to or revisions of any of these publications apply to this European Standard only when incorporated in it by amendment or revision. For undated references the latest edition of the publication referred to applies (including amendments). EN 437, Test gas - Test pressures Appliance categories. EN 10204, Metallic products - Types of inspection documents. EN 50014,Electrical apparatus for potentially explosive atmospheres - General requirements. EN 50020,Electrical apparatus for potentially explosive atmospheres - Intrinsic safety “i”. EN 60947-5-6,Low voltage switchgear and controlgear Part 5-6: Control circuit devices and switching elements DC interface for proximity sensors and switching amplifiers (NAMUR) (IEC 60947-5-6:1999) EN 60529, Degrees of protection provided by enclosures (IP code) (IEC 60529:1989). EN 60730-1:1995, Automatic electrical controls for household and similar use - Part 1: General requirements (IEC 60730-1:1993, modified). ISO 228-1,Pipe threads where pressure-tight joints are not made on the threads - Part 1: Dimension, tolerances and designation. !This standard applies to meters that are installed in locations with vibration and shocks of low significance and in closed locations (indoor or outdoor with protection as specified by the manufacturer) with condensing or with non-condensing humidity or, if specified by the manufacturer, open locations (outdoor without any covering) with condensing humidity or with non-condensing humidity and in locations with electromagnetic disturbances. Unless otherwise specified in this standard: all pressures used are gauge; all influence quantities, except the one under test, are kept relatively constant at their reference value.“ EN 12480:2002 (E) Licensed Copy: sheffieldun sheffieldun, na, Sat Oct 28 11:41:30 GMT+00:00 2006, Uncontrolled Copy, (c) BSI 6 3.1.1 rotary displacement meter (RD meter) gas volume meter in which a rigid measuring compartment is formed between the walls of a stationary chamber and rotating element or elements. Each rotation cycle of the element(s) displaces a fixed volume of gas which is 3.1.2 actual flowrate flow, at the pressure and temperature conditions prevailing in the gas distribution line in which the meter is fitted 3.1.4 working pressure difference between the pressure of the gas at the inlet of the meter and the atmospheric pressure 3.1.5 maximum working pressure (pmax) upper limit of working pressure for which the meter has been designed, as declared by the manufacturer and marked on the meter 3.1.6 metering pressure (pm) absolute pressure at which the volume of the gas is measured 3.1.7 pressure loss non-recoverable pressure drop caused by the presence of the meter in the pipeline 3.1.8 metering conditions conditions of the gas prevailing at the point of measurement ISO 834-1, Fire resistance tests Elements of building construction Part 1: General requirements. ISO 2768-1, General tolerances Part 1: Tolerances for linear and angular dimensions without individual tolerance indications. ISO 7005-1, Metallic flanges - Part 1 : Steel flanges. ISO 7005-2, Metallic flanges - Part 2 : Cast iron flanges. 3 TERMINOLOGY 3.1Terms and definitions For the purposes of this European Standard, the following terms and definitions apply. cumulatively registered and indicated by an indicating device. !It is designed to measure, memorize and display the volume of a fuel gas that has passed through it“ !3.1.3 class 1,0 meter meter which has an error of indication between 2 % and + 2 % for flow rates Q where Qmin Q 1: 50 0,20 Qmax 0,15Qmax 0,10 Qmax 0,05Qmax Each meter shall be adjusted so that the “weighted mean error“ (WME) is as close to zero as the adjustment and the maximum permissible errors allow. TheWME shall have a value between -0,4 % and +0,4 %. TheWMEis calculated as follows: Where: Qi/Qmaxis a weighting factor; Eiis the error of indication at the flow rateQIgiven as a percentage. WhenQi=Qmaxa weighting factor of 0,4 instead of 1 shall be used. 5.1.2 Test The test is carried out using air (density 1,2 kg?m-³), or gas specified in the scope, at normal ambient conditions. The meter is tested at the following flow rates (? 10 %): a)type test: Qmin; 0,05Qmax; 0,1Qmax(when these values are larger thanQmin); 0,25Qmax; 0,4Qmax; 0,7Qmax; Qmax. 2)for meters with a flowrate range ? 1:50: Qmin; 0,05Qmax; 0,15Qmax; 0,25Qmax; 0,40 Qmax; 0,70 Qmax; Qmax. b)individual factory testing for error of indication (every meter shall be tested): Qmin; 0,25Qmax; Qmax. ) /( ) /( = maxi i maxi QQ E QQ WME ? ? !1:20“ !Table 4“ 1) For meters with flowrate range between !1:20“ to 1:30: EN 12480:2002 (E) Licensed Copy: sheffieldun sheffieldun, na, Sat Oct 28 11:41:30 GMT+00:00 2006, Uncontrolled Copy, (c) BSI 12 When requested by the customer, the error of indication test can be carried out at specified conditions (close to the operational conditions). 5.2 Pressure loss 5.2.1Requirements The maximum pressure lo